Engine noise 454 Gen VI
#1
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Engine noise 454 Gen VI
Just did a rebuild on a Gen VI 454. Engine has about 10 hrs on it. Runs fine up to about 1900-2200 RPMs or so.
New mains, rod bearings, rings, and heads redone.
Oil pressure good (40 to 60)
Temp is about 165/170
Not burning oil
The problem is I get a metal rapping/clanging anything above 2200 -2300 especially on hard acceleration and decceleration. It is not a low tump like mains or pinging sound.
Looking for ideas before I tear it down.
Thanks,
Rick
New mains, rod bearings, rings, and heads redone.
Oil pressure good (40 to 60)
Temp is about 165/170
Not burning oil
The problem is I get a metal rapping/clanging anything above 2200 -2300 especially on hard acceleration and decceleration. It is not a low tump like mains or pinging sound.
Looking for ideas before I tear it down.
Thanks,
Rick
#2
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I had a noise somewhat like that within the first 5 hours. I thought I broke a rocker arm stud or valve spring. Turns out the lower crank pulley had worked itself loose and was rattling around. Double check your pulleys. Jeff Wurl
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make sure the balancer is tight...if you replaced the timing chain(they have 3) and you used the wrong one and/or did not put reluctor wheel back on the balancer will bottom out and wobble out...GM did it on mine new engine...
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I agree with all of the above. Also make sure you dont have something else loose in the bilge that could be rattling under those conditions. I thought I had a rocker going out, had a rattle at 2200 or so. After some digging I found a loose bracket, it's amazing how much it sounded like and engine issue.
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Timing was set (grounded out T/bolt ignition). still good. Will check h/balancer. Sounds like coming from port side upper.
Will update when I rip into it.
Thanks....
Will update when I rip into it.
Thanks....
#9
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same issue with mine exact same, i didnt do the rebuild a marine mechanic did, and after removing heads he discovered a sprine keepers had gotten down in block some how. i guess i was lucky as soon as the soon started i mean the first hint of a sound i killed it.