Motor problems... lifters, Cometics and unknown
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From: North East, MD
Thread Starter
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From: North East, MD
Thread Starter
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From: North East, MD
I hate to tear the motor apart, find maybe nothing then put it back together and still have the noise. What would the majority here do?
I don't have any codes either. I thought... misfire related but it doesn't and no codes.
Oil pressure is fine so that means can't be a rod bearing. I'm in fear of holing my block or sending something through a piston taking the whole motor out. Things like this are next to impossible to find!
We are going to do a compression check but doubt we will find anything.
I don't have any codes either. I thought... misfire related but it doesn't and no codes.
Oil pressure is fine so that means can't be a rod bearing. I'm in fear of holing my block or sending something through a piston taking the whole motor out. Things like this are next to impossible to find!
We are going to do a compression check but doubt we will find anything.
When you checked for lose rockers did you rotate the engine by hand to get it on the base circle for each cylinder?
Just re-read post 1... are you sure your not getting actual engine knock as in pre-detonation?
After-market cats?
Just re-read post 1... are you sure your not getting actual engine knock as in pre-detonation?
After-market cats?
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From: North East, MD
Only one side?
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Have you pulled the spark plugs to see what they look like? If you have a head gasket dripping water externally, then it's possible that you are also getting water intrusion into the cylinder. You should be able to identify this by looking at the plugs to see if one or more appear to be steam cleaned. My guess is you are getting water in at least one cylinder and the sound you hear is detonation. No amount of race gas will make water burn! That leaking head gasket needs to be fixed anyway, so pull the head and inspect the lifters while you are in there.
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From: North East, MD
Have you pulled the spark plugs to see what they look like? If you have a head gasket dripping water externally, then it's possible that you are also getting water intrusion into the cylinder. You should be able to identify this by looking at the plugs to see if one or more appear to be steam cleaned. My guess is you are getting water in at least one cylinder and the sound you hear is detonation. No amount of race gas will make water burn! That leaking head gasket needs to be fixed anyway, so pull the head and inspect the lifters while you are in there.
Thread Starter
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From: North East, MD
Have you pulled the spark plugs to see what they look like? If you have a head gasket dripping water externally, then it's possible that you are also getting water intrusion into the cylinder. You should be able to identify this by looking at the plugs to see if one or more appear to be steam cleaned. My guess is you are getting water in at least one cylinder and the sound you hear is detonation. No amount of race gas will make water burn! That leaking head gasket needs to be fixed anyway, so pull the head and inspect the lifters while you are in there.
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Based on what you've described it sounds like detonation. Quit beating on it till you get a data log on it to rule that possibility out.
Edit: How did you prep the block surface and gaskets? Did you use any copper spray etc? If I had water weeping from my heads they would be off ASAP.
Edit: How did you prep the block surface and gaskets? Did you use any copper spray etc? If I had water weeping from my heads they would be off ASAP.
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So we were planning on doing a cylinder by cylinder leakdown test tomorrow A.M. Will that show any head gasket issue or detonation associated with it? I would rather not drive it over to get a log since it is 40 miles.
A leakdown test will tell you if your losing compression in a cylinder. You may be able to hear where the air is escaping to narrow it down. It won't tell you anything about detonation. What's your compression look like? Also, what thickness is the gasket? What size heads? Just trying to get an idea of your quench...