I have what appears to be valve noise in my engine My mechanic thought it was primary or secondary chains. after tarring it down he said they looked fine. so I drove the bike a bit longer until I cant stand the noise. So I had the engine rebuilt at 40K the bike did not make the noise when I bought it 3 months pryer. since the rebuild it is still making the very same noise. So they installed a new second set of lifters it did not help. I still hear the noise but now the mechanic said he can't hear it. If you have any ideas I would sure like to hear theme Thanks
I have an '01 Ultra injected Twin Cam. Bought it a yr ago w/ 30k miles. After some research, pulled the cam plate and found all in fine shape EXCEPT for both cam chain tensioners showing wear to the recommended replacement limit in the Harley manual illustrations. Was considering conversion to gear drive. But since everything is good except the shoes (and I've learned HD went to a tougher material in '03), gonna try the economy route. I don't think the lifters are bad, but with 30 k miles and hours of "my labor", plan to change them while in there.
Wish me luck!
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You have no guarantie, where is the problem to open it? what will you lose?
If is not piston noise, should be the distribuition chain or even the valves, you can check if the chain is enough tense, or if the sound comes from valves, maybe you should rectify the seat valves and change them.
Hope that this helps you!
With the engine running, put the transmission into gear and sit there with the clutch lever pulled in. Do you still hear the noise. If so, most likely the noise is in the primary itself rather than the transmission. Since you didn't specify whether the bike is a Sportster or a BIg Twin, it's difficult to say what the noise may be. It could be a bearing going bad. The problem with that is that you can disassemble the bike and never find the bearing. It could be the big bearing in the outer clutch shell or it could the mainshaft support bearing in the inner primary if it's a big twin. A Sportster has basically the same bearings but in different areas. If the bike is equipped with one of those automatic primary chain tensioners, I've seen them make a noise as well. Then again, a noise like that is very difficult to find. It seems to travel all through the engine. It could possibly be an inner cam bearing going bad. They sound exactly like the alternator whine on a Chevrolet. If you have one of those mechanic's stethoscopes or long screwdriver, listen to various places on your engine to try to locate the noise more closely.
Have you checked the tension on the primary chain lately? Take the oval shaped inspection cover off the the primary cover on the right side of the bike. Check the tension on the top run of the primary chain in the middle of the run. You should have between 5/8" (15.8mm) to 7/8" (19.0mm) with the engine COLD. To adjust loosen the nut that holds the primary chain shoe in place and raise the plate to tighten the chain, lower it to loosen. Since working through the inspection cover hole is tedious, some people elect to take the outer primary cover off and then set the tension. Refill the primay with 36 to 42 ounces of the appropiate oil. Harly uses H-D Syn3 20W50 synthetic engine oil in the primary.
If the noise seems to be coming from the right hand side of the engine, it could be the cam chain tensioner and shoe. To repair this requires going into the cam chest. This is something that I do not recommend for the amateur mechanic. There are also some special tools required to work in this area.
It could be your primary chain and chain guides,the chain wears and the guides harden with time and will transfer more internal engine noise through the transmission. There is also on the primary hub/sprocket and internal rubber damper all this stuff ages with in time loosing there dampening qualities. resulting in amplified mechanical noise.
When is the last time you checked the adjustment of your primary chain? It should be adjusted to where you have 3/4 to 7/8 inch up and down play when checked in the middle of the upper section of the chain when COLD. I like to set the chain at the 3/4 inch setting if possible. As the engine/transmission heats up, the chain will tighten up. If the chain is too loose, it will rub the top of the inside of the inner primary cover when you back off on the throttle.
Also, you didn't say how many miles your bike has on it. You could need to replace the nylon shoe on the primary chain adjuster mechanism if it's worn badly. Also, I've seen a lot of spring cups on the compensator sprocket go bad. Remove the outer primary cover and try to turn this cup with you hands. If you can turn it by hand, you probably need to replace it. This will make a "clop, clop, clop" type noise when idling. While in the primary, check the torque on the engine sprocket nut. It should be 150-165 foot pounds. You will need a primary locking tool to check this as the engine will turn over before you reach that torque level.
Wow, valves and other related engine noises don't care what gear you are in, they still make the noise. However your motor may be "lugging" in 5th gear which can cause a symptom of an engine related issue. You may have an issue with the actual gearbox its self. There is a primary drive chain that may be worn which will cause excessive noise in top gear because it is putting the greatest load on the engine. This is what connects the engine to the transmission. I think there is a tensioner for your model that will allow you to adjust the free play in the primary drive chain. If not I strongly recommend replacement because this will cause major damage if it breaks.