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Old 08-21-2002, 06:59 PM
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Post Knocking on 1989 Chevy Beretta 2.0L

I purchased a 1989 Chevy Beretta, with 163,000 miles, 2.0 liter with a 5-speed from a friend who had someone take out the #1 con rod bearing. It was in three pieces. They claimed it constantly had a mild knock at idle and drive. He had a friend put a .010 bearing in the #1 con rod. It still knocked. Then, they just jumped to a .030 and put it in without checking clearances with plastigage.
I'm about to check clearances with plastigage using a .020 bearing on the #1 cyl. Other than this, what produces the muffled knocking sound coming from the bottom of the motor? It is the #1 cylinder away from the trans, in a sideways installation from the factory. It's front wheel drive. Could it be the connecting rod, lifter, piston pin, or harmonic damper? Or anything else?
All replies are greatly appreciated? Thanks. Walt

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Old 08-21-2002, 07:13 PM
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the rod might be out of round, but my brothers 89 with a 2.0 has about 134000 and makes all kinds of racket
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Old 08-21-2002, 11:32 PM
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Rebuid tiiiiiime!

Forget trying to do a quick fix with the engine in the car. Probably your crank is scored and is so badly damaged nothing you put in there will last long. Any friend that is putting con-rod bearings in without checking clearances and journal surface integrity is no friend of mine. If you want a quick fix, swap out the engine with a good used one.

That one needs help....badly.
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Old 09-04-2002, 04:22 PM
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Well, this is what happen when I worked on it. I found out it was the #4 and not the #1 Connecting rod bearing. Also, they had a .020 bearing. So, I plastigage a standard bearing, which was too loose. And the .020 was too tight. The .010 made it with less than .003 clearance. I put everthing back and fired her up; there was no knocking sound. I want to thank Both CARGUY, 4 Jaw Chuck for your replies which I ran over the same thoughts myself. With 163,000 miles, she running alright. Thanks guys, Walt
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Old 09-04-2002, 05:14 PM
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Lucky there was no major damage, pray to the mechanical Gods tonight for penance.
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Old 09-04-2002, 06:03 PM
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I must be missing something here or its old age catching up on me. Please explain how you could run the engine with a .020 OS bearing in it when a .010 gave you .003 clearance? A .020 would give you (-).007 cleanance? That not even counting the #1 rod bearing haveing a .030 OS bearing in it which should have given you about a (-).017 cleanance. <img src="confused.gif" border="0">

[ September 04, 2002: Message edited by: hcheetwood ]</p>
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