Torquing rodbearings, Crank locking up? - Team Camaro Tech
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post #1 of 7 (permalink) Old Jan 25th, 02, 02:30 PM
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Hey guys,
I'm helping a friend with his 2.8 chevy motor and on his #5 rod bearing, when he torques the nuts to 43 psi the crank is very hard to turn.....loosen the nuts and the crank turnes
easley...(screwdriver on the flywheel)
all bearings have a slight coat of axle lube(friends idea)...we put all standard main and crank bearings....
Has any of you ran into a problem like his?
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post #2 of 7 (permalink) Old Jan 25th, 02, 03:48 PM
Join Date: Dec 2001
Posts: 106

sometimes a rod can **** on the crank slightly and cause the bind you describe.
gently tap side to side with a rubber mallet and you may find that the rod cap is really not fully torqued and will release when
properly squared up to the crank.
I've seen this many times.
just 1 possibility.
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post #3 of 7 (permalink) Old Jan 25th, 02, 05:20 PM
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Sounds like you might have got some of the rod caps mixed up. Are you sure the rods and caps were kept together?
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post #4 of 7 (permalink) Old Jan 26th, 02, 10:04 AM
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Are the rods assembled correctly on the pistons? Chamfered side of the bearing shells toward the outer edge of the journals?

'69 Z28 Fathom Green
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post #5 of 7 (permalink) Old Jan 26th, 02, 11:55 AM
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Location: Waldorf Md. USA
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Why are you replacing the rod bearings ??? If it is because of a knocking problem, it is possible that the one rod is distorted and will not work properly.
Is it possible that there is some dirt behind the bearing, it does not take much to lock it up.
By the way, axle lube is not the correct lubricant to use on an engine bearing. It is designed for a roller type bearing. There are lubricants that are designed for engine bearings.
Make certain all the rods are the correct ones for the caps.
John, on a 2.8 the rods can go on either way because there is a seperate journal on the crank for each rod.
Something sounds something else is wrong,
let us know how you make out.

Bill Koustenis
Advanced Automotive Machine
Waldorf Md
1971 Chevelle "Heavy Chevy" original owner
1973 Z-28 family car...Brother bought it new in 73
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post #6 of 7 (permalink) Old Jan 26th, 02, 02:25 PM
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please throw the axle lube away, i have found that stp or anything in that order works well as a lube. but it sounds as you have a problem you may need to check the dia of the crank.
post #7 of 7 (permalink) Old Jan 26th, 02, 02:54 PM
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Hey guys
I found the problem...he had #1 and #5 rod cap mixed up......I told him not to use axle dope for his bearings, but you know the way stubborn friends are!
So he started his car up and it was knocking!....I was called in at the half way through this mess so I told him to step back and Sunday I'll take the bearings back out and inspect everything.
His car had a knock above 2000rpm so he decided to change the bearings in the first place.
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