Changing Main & Connecting Rod Bearings
Forum: C3 Engines, Driveline and Handling
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j
My oil pan is really dented and I bought a new one to replace the old one. on my 350 CID V8.
While I'm in there, I want to replace the main and connecting rod bearings as I have a vibration at 2500-3500 RPM and I'd like to eliminate the bearing as a potential cause.
Has anyone done this and how long should it take? Should I buy standard, plus .001 undersize and .002 undersize before I start the job, as I believe you need to replace them one at a time if you leave the engine in the car. Where is a good place to get main and connecting rod bearings and is there one kind that if prefferable?
I went to AutoZone and they have a good technical article on how to do the replacement.
Also question on the oil pump, I likely should replace it, but should I go with the standard one or the heavy duty one.
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V
Former Member
Send PMMounds View, MN - USA
Joined: 5/24/2007
Posts: 1034
Vette(s): 70 LT1 coupe, 69 350 HP coupe, 69 390HP 427 coupe, 71 LS5 convert, 85 coupe, 93 coupe
Replacing bearings is not a big job. I always use Clevite. You don't know what size until you take them out and check. Undersized bearings are always stamped on the back. It is best if you can mike the crank, but that is almost impossible in the car. To do the main bearings, loosen them all a couple of turns to let the crank down a bit. Then just push out the old and push in the new. Use assembly lube or just coat them with oil. Retorque the mains, and turn the crank until one rod throw is low enought to change them. Repeat for the other three throws. Retorque everything just to be sure.
The standard oil pump is perfectly adequate for a stock or slightly modified engine. A high pressure or high volume pump just wastes horsepower.
Put a little silicone sealer in the corners when you put the pan back on.
As an afterthought... I can't imagine a way that worn bearing could cause a vibration. If the problem is in the engine, the most likely culprit is a failing harmonic balancer. But a vibration is usually in the drivetrain.
Larry
The standard oil pump is perfectly adequate for a stock or slightly modified engine. A high pressure or high volume pump just wastes horsepower.
Put a little silicone sealer in the corners when you put the pan back on.
As an afterthought... I can't imagine a way that worn bearing could cause a vibration. If the problem is in the engine, the most likely culprit is a failing harmonic balancer. But a vibration is usually in the drivetrain.
Larry
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j
How do you find out if harmonic balancer is bad?
Driveline should be ok, new pilot bearing, clutch, rebuilt 4 speed manual trans and diff and new u joints
Driveline should be ok, new pilot bearing, clutch, rebuilt 4 speed manual trans and diff and new u joints
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While your in there, you may as well replace the rear main seal. I did mine, so it has to be easy.
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in Forum: C3 Engines, Driveline and Handling
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