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noise in 454 gas engine

A

Anonymous-0

Well-known Member
have a pecking noise in the front part of the engine
it will change if you load the engine also it will almost go a way if go down hill. you can change the sound by advancing or retarding the dist. i went through the engine about 5yr ago,it was there then but has gotten louder over the years. getting ready to put a clutch in it, would like to fix the noise.
 
I would suspect a sloppy timing chain. The slack side can rap against the front cover when they get worn.

Do you remember what kind of timing set you put in?

I'm assuming this is in a pickup. From underneath, take the front pulley in both hands and try to turn the crank each way. You can feel it take up the slack in the chain when you reverse direction. Any amount you can feel is too much. Use a ratchet and socket on the dampner retaining bolt if it's too hard to turn by hand.

Another possibility, since there is some change under load, is the beginning of piston slap.

I bought a running 454 once that had been previously "rebuilt" and all they did was put new rings and stuff. (Fine with me, because it was still standard bore.) I ran it in something for a few months and under acceleration it sounded like you had detonation in all 8 holes but it was just bad piston slap. When torn down for a real rebuild the piston to wall was something like .010!
 
There is also an International 454 Utility tractor.

I should hope he is not asking about the big block Chevy engine on a TRACTOR forum.

Still, there's lots of stuff that could make rapping/ticking/clicking/clattering noises. Your rap is my click is someone else's clack and another's tick.

Without having an engine expert actually LISTEN to the noise it's impossible to diagnose. Could be piston slap. Could be rod knock. Could be a loose wrist pin. Could be a foreign object in the #1 piston.
 
Hi, I had a GM 350 that would do that and a mechanic had me convinced it was a worn timing slapping against the cover and he was going to have to pull rad and everything off the front of engine to replace. I am lucky he didn't have time to work on it that week. I took it home and used the old broom stick method and found it was coming from the fuel pump. Remove fuel pump and the return spring was broken. I guess the fuel pump lever was not following the cam and at certain speeds was making the knocking noise.

JimB
 
Pull the plug wire on the cylinder that is closest to the noise. if the noise changes substantially, it is likely a wrist pin that is loose. The rod would need a new bushing pressed in, and fit to the old, or new wrist pin. The fit is .0005" max. if tighter but still will move by easy hand movement on the pin it is OK.
Loose timing gears from the front pulley being improperly seated is another possibility if the noise does not change with the plug wire off. Loose cam gear is actually modestly common.
Valve adjustment wrong (loose) is possible, as is a rocker arm moving sideways on its shaft.
A worn valve guide also makes the same noise, Usuallt so worn that it can be moved sideways with the spring on it. Best of luck. Jim
 
(quoted from post at 16:47:32 10/03/11) Pull the plug wire on the cylinder that is closest to the noise. if the noise changes substantially, it is likely a wrist pin that is loose. The rod would need a new bushing pressed in, and fit to the old, or new wrist pin. The fit is .0005" max. if tighter but still will move by easy hand movement on the pin it is OK.
Loose timing gears from the front pulley being improperly seated is another possibility if the noise does not change with the plug wire off. Loose cam gear is actually modestly common.
Valve adjustment wrong (loose) is possible, as is a rocker arm moving sideways on its shaft.
A worn valve guide also makes the same noise, Usuallt so worn that it can be moved sideways with the spring on it. Best of luck. Jim
Click to expand...

All things that can make a noise but he said the noise changed with engine load. That should eliminate the valve train system since the load on it doesn't vary much with engine speed or load.
 
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