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Need help with connecting rod knock
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tiorunder
User
Jun 21, 2008, 10:23 AM
Post #1 of 2
(2715 views)
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Need help with connecting rod knock
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Got an '85 Chevy pickup 350 V8 turbo 350 trans with a slight rod knock upon starting the motor.
The motor knocks about 5 x (knock knock, knock, knock, knock) and then quietly disappears as oil pressure rises. I don't have a functioning oil pressure gauge in the truck, so I am not sure what oil pressure measures.
I can also hear the knock ever so slightly when I am driving in first or second gear at a constant rpm (3000?).
I can easily remove the oil pan from this truck without pulling the motor out.
Question 1). Is there a quick fix for this condition? and if so:
Question 2). How do I find the culprit rod?
Thank you in advance
Tiorunder John
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Tom Greenleaf
Ultimate Carjunky
/ Moderator
Jun 21, 2008, 11:11 PM
Post #2 of 2
(2710 views)
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Re: Need help with connecting rod knock
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At the age it probably isn't just one isolated bearing. Miles, poor oil history, oil pump problems, sludge etc. Changing oil may help patch it with synthethics if you can get a reasonable oil pressure reading. You may have to mix but perhaps a 15-40 would cover it for an unknown amount of time.
I don't know of a quick fix. If truck is worth keeping a whole used motor checked out and known good would be the longer lasting and cheaper fix IMO,
T
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