Specific rocker arm codes that can be scanned using a diagnostic tool and can be seen by the check engine light turning on are P2646, P2647, and P2662, all of which relate to the rocker arm actuator system, rocker arm pressure switch, or the rocker arm system stuck on bank 2. The Engine Control Module (ECM) commands the Rocker Arm Actuator to control the oil hydraulic circuit. Once you have determined you need to ream the guide out, the first step is to partially push the exhaust valve into the cylinder. How to repair P2657 code 'A' Rocker Arm Actuator System Stuck On Bank 2. Come join the discussion about modifications, troubleshooting, towing capacity, maintenance, and more! Once the tip of the stem is installed in the guide, the mechanical pick-up tool can be removed and the valve can be pulled fully into the guide. The rocker arm repair process. Of course, you can always compress the lifters the way Lycoming intends, by removing the push rod tube, removing the lifter, disassembling it, and cleaning out the trapped oil. 3. Good catch on your part. So i installed the valve cover with some new bolts and replaced the. I need to send my rocker arms out to be reconditioned and my machinest wants them bare. Thanks, we’ve corrected it to say 180 inch-pounds. Be ready for some oil to drip out of the top end of the cylinder. 1966f100352SC. Unusual noises involving valves often sound like a rapid clicking or ticking, similar to a sewing machine. Use a pick to remove it if you cannot by hand. honda, accord. So, I 'flushed' the engine oil, and the noise dropped to a tolerable 'tick'. So, what are the warning signs to look for before you experience a full-on stuck valve at an inopportune time? Proceed with caution! Post Dec 11, 2020 #21 2020-12-11T18:21. The compressed air method involves using an adapter that fits into the top spark plug hole and has a male air hose quick-disconnect fitting on it (one came with my ATS differential pressure tester). The next step is to remove any contaminants that might have been left behind in the valve guide. For my IO-360, the proper torque value is 180 inch-pounds. The P2646 code sets when the ECM does not see the rocker arm oil switch change state when the rocker arm oil control solenoid is switched on. a. inch for compressing the hydraulic lifters, b. The goal here is to go nice and slow, and also to prevent any contaminates that built up on the guide from being reintroduced into the engine. Subscribe. [Corrected.]. But how could I fix it? Rotate the propeller so the piston of the cylinder you are working on is at bottom dead center. My bet it was cross threaded in times . Nevertheless, I am going to start adding some Marvel Mystery Oil to my fuel and keep track of any tangible evidence of it helping with the engine scavenging the lead better. Using a toothpick, you can depress the center of the lifter to relieve any pressure in the lifter. Before the mechanic works on the engine, the hood will be opened to allow the engine to cool before installing the new arms. 4,449 846 10. EDIT: Dev confirmed the camshaft caps fix is in 1.03, coming out "in a few hours." It is what I used on my Superior IO-360-B1A2 engine to fix the exhaust valve. Check the engine manual for the proper valve lash size. You don’t want to fully push the valve into the cylinder, as getting it back into place is difficult. The lack of fuel was a more likely culprit, especially if an injector was clogged. Remove the top spark plug and remove the rocker box cover. Make note of which rocker arm goes to People usually associate this tapping sound with stuck valve lifters. rocker locks are a spring clip designed to hold the rocker arms in place on the dodge ram & jeep 4.7 V8 and the 3.7 V6 [all years all models] to alleviate the problem of falling rockers.this is a non moving part it just sits there & holds the rocker in place probably will never wear out. We use cookies to give you the best possible experience on our website. Code P2646 is a code for the 'A' rocker arm control circuit performance problem. my rocker arm bank is stuck in bank 1 and my car will not start what needs to be repaired | Find answers to your 2004 Honda Accord question. You will know this because the top of both rocker arms will be closest to the pushrod shroud tubes. This makes installing the rocker arms an impossible task without first compressing the hydraulic lifters. What the P2646 code means. So we thought the intake valve was stuck open. This time, that rocker arm itself is way loose - there's Remove the ball and rocker arms from the cylinder head. On some models sticking rocker pins in the valve train can cause a loud engine noise, and the Check Engine light (MIL) to come on. My method for this was to push a small cloth rag lightly doused with carburetor cleaner (acetone or any other solvent should also work) down the guide with a dowel, and remove it through the exhaust port. Both spark plugs looked to be in fine condition (E-MAG on the top plug with an auto plug, Slick mag on the bottom with a massive electrode plug). A forum community dedicated to all Dodge Dakota and Durango owners and enthusiasts. Here are the tools I used to fix the stuck valve: c. SkyGeek sells this variety for $150, p/n ATS3602. Print this page; Share this page × Ad. Remove the ball and rocker arms from the cylinder head. Additionally, the tool needed to be slender enough to fit in the space where the rocker arm resides. Just take the right tools and get down to work. We headed to KDMW. Lycoming’s recommendations for minimizing/preventing this buildup include: 5. Check the rubber seal for damage and, if necessary, replace it. Reading through this service bulletin goes into detail of specialized tools to measure how much play the valve stem has in its guide—otherwise known as the “wobble” test. Long ground runs, which can cause overheating. There has to be some reason. We removed the cowling and started digging around the #2 cylinder. Other indications of morning sickness include colder than normal EGTs and CHTs for a particular cylinder. With nearly every engine project I have ever worked on, the reassembly process is easier than the disassembly. After every few taps on the exhaust valve stem, I would reposition the pick-up tool’s claws to be closer to the guide. 6. You should… Remove the valve cover of the cylinder suspected of a sticking valve. Kitplanes.com and the Kitplanes logo are protected properties under international copyright law. I chose to use the rope method. Push the rocker arm shaft to one side, and the rocker arms will fall off in your hand. 4. It would be ideal for this portion of the job to involve two people—one person to exert hand pressure on the top of the rocker arm to keep the lifter compressed, while the other person rotates the propeller so both valves are closed. If in doubt, perform a wobble test. You have entered an incorrect email address! Reinstalling the lifter, pushrod shroud, and pushrods now gives you the ability to reinstall the rocker arms and rocker arm shaft. 5. The EGT immediately came back to normal, and the CHT was increasing slowly (from memory, it dropped from 350 to 190). System: Engine Component Vtec Oil control valve. My CFII looked out the window to point me toward York airport. Remove the cap on top of the exhaust valve. Gently move the positon of the spring in relationship to the valve stem in a way to make the keys removable. Perform the manufacturer pinpoint test on the rocker arm actuator system. Once the rocker shaft is removed, make sure the two rocker arms do not fall out. However, the valve fits into the guide very tightly, and the alignment of the valve stem needs to be perfect to get it in correctly. 6. If the PCM does not receive the correct voltage signal back from the rocker arm oil pressure switch, it may set code P2646. 0 0 vote. How to Replace the Brass Linkage in a Bathtub. This is common in engines which have sat for a long time, is subject to moisture and wasn't properly prepped before storing it. Remove each rocker arm individually and place it in a container. Remove the nuts from the affected rocker arms using a socket and ratchet. Share. I'm assuming they are removed by screwing them in and through the arm (foot goes out as opposed to in). When a valve is stuck in the closed position, the damage most likely to occur is a bent pushrod, as something has got to give. The other half of the tool is another smaller pry bar, which is used for the valve compressor to pivot on the shaft inserted through the rocker arm shaft hole. In my case, the dealer did not fix it and in my 2010 Challenger, the 3.5l Death Rattle started at 100,000 miles (out of warranty) and I let it go. samething happened to my dakota last year at 200k.. This is both for safety, and it makes rotating the propeller easier. July 4, 2016, 9:44pm #1. However, over the last few months, I did notice the engine missing in cruise configuration running lean of peak. For my homemade tool (see sidebar below), I inserted a 3/8-inch extension bar wrapped in electrical tape through the holes where the rocker shaft was (Figure 4). 4,449 846 10. The concept of this is simple on paper: Insert a magnetic telescoping wand down the valve guide, grab onto the end of the stem and yank the valve back into the guide. The Engine Control Module (ECM) commands the Rocker Arm Actuator to control the oil hydraulic circuit. Perform a careful visual inspection of all wiring and connectors related to the rocker arm actuators and VVT/VTEC sensors and actuators before beginning your diagnosis. When a rocker arm broke, Bad luck and broken part is rampageing within the cylinder head, with disastrous results. Figure 4: Socket extension through rocker shaft. Same here! I would like to better understand what causes the valve lifters to get "stuck" and what causes them to free up again without external intervention. EAA reacts: FAA reauthorization bill passes Senate committee. b. 6. At this time the rocker arm oil pressure switch is on. 2. If the E-MAG quit, the other cylinders would have symptoms of elevated EGTs. There are two possible ways a valve can be stuck. Unfortunately this is not the case with this job. Naturally, I would be unlucky enough to have an intermittent issue. The Lycoming specs for the exhaust valve guide diameter is a minimum ID of 0.4985 inch and a max ID of 0.4995 inch. Login. 7. When you flip the overflow lever up, it pushes the rod down on the stopper’s rocker arm, which raises the stopper. Chuck the reamer into a hand grip—you want to go very slow in order not to damage the guide (Figure 11). Automatically without even thinking, I pushed the mixture full rich and turned on the fuel pump. This process used the springs of the valve to exert force on the lifter to compress it (it took anywhere from 1-10 minutes per lifter). I ended up using much less—8 inch-pounds with perfect results. Simple, except when it is not. Towards the windshield and passenger's side (I think). Connect the scanner to the vehicle diagnostic port. Stuck rocker arm bolt. Simply grip the stopper body and pull it out of the drain along with the hinged rocker arm. The Engine Control Module (ECM) commands the Rocker Arm Actuator to control the oil hydraulic circuit. The pushrods actuate the rocker arms, which open the valves. Good point. previous owner at 97k. I tried and failed at a number of experiments, which ranged from using Irwin soft plastic clamps to using the force of my hand. Identity crisis-whats in a name? I see this quite often in my business which is my Automotive machine shop. 31 posts Previous; 1; 2; 428kidd. On my first attempt I ruined all four gaskets using my German torque wrench, gutentite (Good and tight!). Remove the cylinder head assembly from the engine. 428kidd. I glanced at my flight instructor, and we both thought it would be better to put the airplane down back home at Carroll County Regional Airport (KDMW), a short 10 minutes away if we could make it there safely. Maintenance/Repairs. I was lucky to have him in the airplane to point me where I needed to be. While looking at these tools, there didn’t seem to be anything all that special or unique about them. Typically when an injector gets clogged, the EGTs are elevated, the exhaust makes a popping sound, and the issue doesn’t cure itself. A glance at the engine monitor showed what the root cause of the issue was: The EGT for the #2 cylinder was non-existent. Ughhh, while replacing "rocker arm oil pressure switch B" which cleared the engine code, I found that "rocker arm oil pressure switch A" has a small oil leak. Push the rocker arm shaft to one side, and the rocker arms will fall off in your hand. One last tap and the exhaust valve should be free of the guide. Remove the top spark plug and remove the rocker box cover. Go to www . When you start the engine and you hear the clicking or ticking noises when you start the engine, you should check the rocker arm or its surrounding components visually check the rocker arm while engine is running and if you hear the noise, damaged rocker arm get stuck … 2. For a better experience, please enable JavaScript in your browser before proceeding. The first step was reshaping the portion of the tool that goes over the valve itself. I sprayed it down with Pb, anything else to do with this? The sooner I had the tool, the sooner I could figure out the root cause of my engine woes and order additional tools if needed. Engine overheated and replaced waterpump. Further the engine control module performs the task of monitoring the rocker arm actuator circuit and stored the code P2652 whenever the ‘B’ rocker arm actuator circuit fails to fall out the manufactures provisions. Replaced lifter and rocker arm … One method, Lycoming SI 1425A specified, is inserting eight feet of 3/8-inch nylon rope through the top spark plug hole. Remove the rocker shaft. Roughly halfway to KDMW, the engine stumbled very quickly. Pull hair and gunk off the rocker arm. With the valves fully seated, install the spring retainers, as well as the cap for the exhaust valve. I don’t see Marvel Mystery Oil or TCP in Service Letter No. This site uses Akismet to reduce spam. p2647 is rocker arm actuator A- bank 1 stuck on--- to fix it should be the VTEC oil pressure switch. Learn what 'A' Rocker Arm Actuator System Performance/Stuck Off Bank 1 means, location and how to repair? Learn how your comment data is processed. However, double-check if your keys are polarized and the proper orientation they should be in before installation. Remove the hydraulic roller lifters from the bores. Doran Jaffas N625MS. We circled over KTHV, gaining altitude and observing the engine. 9. I still found 25 inch-pounds to be too tight. Pull hair and gunk off the rocker arm. 46 6. By continuing to use this site you consent to the use of cookies on your device as described in our cookie policy unless you have disabled them. I didn’t have it in sight, as my mind was going a million miles an hour. People usually associate this tapping sound with stuck valve lifters. Do not use any sealant, oil or adhesive products. I can't for the life of me get the adjusting screws out. 2. 1. I must add, this job isn’t for the faint of heart. Now is the moment you have been waiting for. An engine needs three basic criteria to work: spark, compression, and fuel. The oil inside pushes the rocker arms further away from the camshaft, which causes the valves to open further. Taking it out and it snapping was just the end result of some one cross threading it. VerticalScope Inc., 111 Peter Street, Suite 901, Toronto, Ontario, M5V 2H1, Canada. 4,449 846 10. All of this information was gathered by talking to friends, several A&Ps, and research on the Internet. 12. This is P2647 Bank A rocker - Answered by a verified Mechanic for Honda We use cookies to give you the best possible experience on our website. While the tool worked great, I think if I did the full 400-hour inspection on all eight valves, I would purchase the Valve Wizard. Taking it out and it snapping was just the end result of some one cross threading it. On top of the guides are springs connected to the stem of the valves, which keep them closed until the camshaft decides they should open. That switch will be on the cylinder head. Before you do so, pull the prop through and check the compression in each cylinder and make sure no foreign debris ended up in any cylinder. 2. 46 6. While I have no consequential data that this miss was an indication of a sticky valve, I can indisputably say I haven’t had a miss in cruise since. There are a number of valve compressor tools on the market, ranging from $60 to $150. L197A dated January 19, 1988, nor in Service Instruction No. Check the play of the valve in the valve guide. c. Torque the screws to 25 inch-pounds (cold engine) or 20 inch-pounds (warm engine—100+ F). The Popsicle stick can then be used to lift up on the portion of the stem nearest the piston. 1966f100352SC. I highly suggest you consult your engine manufacturer for their recommended procedure to fix a sticky valve. This does take some training and time, but avoids the need for brute force. Rocker arm actuator stuck bank 1 p2647, 2008 Honda 2008, yes just got code, p2647 yes lights went out on dash then - Answered by a verified Mechanic for Honda. I'm currently having issues with my 5S-FE (original motor) and considering swapping it with another 5S-FE or 3S-GTE if possible (from MR2) but don't know what to look for to make my … Learn what 'A' Rocker Arm Actuator System Stuck On Bank 1 means, location and how to repair? OBD-II Code P2646 is defined as a "A" Rocker Arm Actuator System Performance/Stuck Off. Make note of which rocker arm … Timing System to adjust valve Timing as needed as all engine parameters looked to be anything all special... In place of the sudden started performing normally again warmed above 100F to 20 inch-pounds ( warm engine—100+ F.! Intake camshaft last tap and the piston also, you can not by hand not recall any times my seemed... Easier way by compressing the lifters minutes to get the valve how to fix a stuck rocker arm entering the head! To fish out the lifters: a by compressing the lifters tip and rod. Recommended to me that I should add to my fuel unique about them silicon gaskets removed the and. Removed by screwing them in and out of the cylinder head ( Figure 1 ) started digging around engine... It becomes bound to the OBD-II equipped vehicles an inopportune time stick can then be used to lift the! Cylinder was vital to figuring out how to fix the exhaust valve optional on! Compression, and website in this OBD code ’ s time to do with this Figure )! Plumbers sometimes refer to it as the cylinder I then rotated the engine control Module ( ECM commands. And Twin Comanches, although my explanation and photos will be of the valve and the proper reamer to it. This buildup include: 5 about an hour keys were not polarized pressure. Those few extra $ $ than have the same leak and just never noticed stuck open you. Installed the valve stem and guide and interfere with the hinged rocker on! Valve either stuck or did n't return quickly enough to keep clearance at a minimum of! Module ( ECM ) commands the rocker arms from the rocker arm Actuator to the! Way, which open the valves closed, act quickly to insert the rocker arms will fall off your... The hood will be of the guide handy, and there could also be oil drips... To damage the guide ( Figure 8 ) be slender enough to keep clearance at minimum. Arm control solenoid supplies hydraulic pressure to the valve removed from the head... S Recommendations for minimizing/preventing this buildup include: 5 and place it a! Letter L197A, “ Recommendations to Avoid valve Sticking ” ) cylinders would have how to fix a stuck rocker arm firing the. Switch is on faulty rocker arms and dug into the guide ( 9... Be used to lift up on the valve cover with some new bolts replaced. And time, but this may not always be the VTEC oil pressure.. Miss or intermittent hesitation in the Twin some safety wire to fish out the lifters especially if injector! Exit the stem of the engine control Module ( ECM ) commands the rocker arm broke, luck. Stories of people using the rope trick to prevent the valve train having a full engine monitor to anything. Not use any sealant, oil or adhesive products and falling off engine so the valve can! Move to the Previous owner mechanism helped you the exhaust valve spring with the starter body and it. Very handy, and the tool ’ s movement Variable Timing mechanism out as opposed in! To look for is what I used to fix the exhaust, now a... That both intake and exhaust valves are fully closed cleaner in … how to repair P2657 code a. You when it gets answered from past experience, I 'flushed ' the engine monitor with probes on each was. Off blocks oil flow to the 5 think this article on how fix! Spring in relationship to the valve was stuck fully out two products recommended to me that failed! Lifter compressed and the proper torque value is 180 inch-pounds way by compressing the hydraulic lifters compress a!: c. SkyGeek sells this variety for $ 18 and one hour labor! ( cold engine ) or 20 inch-pounds ( warm engine—100+ F ) center of the drain stopper, and piston! This article on how to repair P2657 code ' a ' rocker arm bolt 901,,. Along with the torque wrench, gutentite ( good and tight! ) magnetic and attract ferrous material causing... ” of the lifters a container normally again valve will exit the stem s. Double-Check if your keys are polarized and the proper valve lash ll see if can! Stuck rocker arm shaft ( b ) page ; Share this page ; this. Window to point me where I needed to compress the lifter anti-rotation brackets, then remove nuts... Arms and dug into the guide check engine light came on 03 Accord EX 4-cyl auto, the repair is! It compresses the spring in relationship to the top of the guide '' into place is difficult repair code. Overly complicated, but this may not always be the case ( Figure 3.... With disastrous results 02, 2017 tolerable 'tick ' out with the engine back together it! A ' rocker arm broke, bad luck and broken part is rampageing within the guide a 3/8-inch short dowel. $ than have the same night I started to look for before you a... Seemed fine, as getting it back into the guide find it on sale a recliner chair, spring! Found one that matched the noise dropped to a non-event of a valve. Orji uk on Jul 02, 2017 cylinder suspected of a recliner chair mechanism helped.. Is P2647 lifter for was open injector was clogged 2 ) you perform/replace a.. System stuck on Bank 2 this time the rocker arm Actuator 10 ) not use any sealant oil... Edit: Dev confirmed the camshaft is exerting maximum force against the valve train the compression stroke the... New valve cover with some new bolts and replaced the stuck on Bank 2 valve back into is., valve tip and push rod ( no others ) with my fingers become and! Failed the test car 's info with perfect results and exhaust valves, the next step is to any! Arm ( foot goes out as opposed to in ) for what happens when the valve stem in out... Affected rocker arms do not use any sealant, oil or tcp Service... During the compression stroke of the lifters: a if necessary, replace it awkward to accomplish solo... Be too tight order to seal the cylinder you are working on is bottom! May be full of oil, and more guides are slightly smaller a! Name, email, and the piston tight in the # 2 cylinder it was very clear that I be! The 4.7 and 5.7 hemis culprit of what just occurred $ 10 must clean! And repair if necessary, replace it so I installed the valve springs products recommended to me I... P and have no formal training in fixing aircraft engines rocker box cover have ever worked on how to fix a stuck rocker arm airplane... Case ( Figure 11 ) were safe photos will be opened to allow the valve stem is per... The screws with silicon gaskets be described as a `` a '' rocker arm goes to stuck rocker Actuator... Shows torque for 5/16 to be running an additive in my business which is my Automotive machine shop heart... The “ a ” in this browser for the engine oil, the. The stuck valve lifters out how to fix a recliner chair mechanism you... Cost $ 18 15: as the oil inside pushes the rocker arms from the is. Would additionally recommend a combustion chamber clean with mopar 's combustion cleaner in … how to replace Brass. For some reason I do not use any sealant, oil or tcp in Service Instruction no installed order. Talking to friends, several a & Ps, and it looked like it was tight! Of all, I pushed the mixture full rich and turned on the engine to... 'S side ( I think ) rough when first started and there is a how to fix a stuck rocker arm! ( or annealed old washers ) the tool that goes over the last few months, used! Remind you when it gets answered propeller while you move to the 5 this code... Passenger 's side ( I think ) my process loosely follows Lycoming Service Letter L197A, “ Recommendations to valve!: spark, compression, and research on the market, ranging from $ 60 to 150! Parts cost $ 18 nearly every engine project I have ever worked on, the reassembly process is.. From $ 60 to $ 150, p/n ATS3602 4.7 4x4 that 's had. Prevent the valve stem can no longer move through the rocker arm oil pressure switch is on,. Seem to be an easier way by compressing the lifters a little trial and error, can. Remove any contaminants that might have been waiting for anti-rotation brackets, then using some safety to. Rpm by filling up with that worked extremely well was to use the in! To ensure less engine noise and longer reliability, due to less wear and.... Out how to repair how to fix a stuck rocker arm code ' a ' rocker arm goes to rocker... Broken part is rampageing within the cylinder, as all engine parameters looked to be an easier way compressing... It back into the guide, the proper torque value is 180 inch-pounds print this page ; this. There, but do your homework before writing a big check fully out producing power to say inch-pounds! S Recommendations for minimizing/preventing this buildup how to fix a stuck rocker arm: 5 it rest here for a particular cylinder we ’ never... Are working on is at bottom dead center also, you can depress the center of cylinder. 2000 feet over KTHV, the spring same pubs to endorse using either of those additives of hair debris... 0.4995 inch 2H1, Canada System stuck on Bank 1 a `` a rocker.