Help!!!
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Help!!!
Rebuilding my first engine. 92-93' 5.0L H.O. New rings, main bearing, and rod bearings. Crand has also been micro polished. I just put it together. Torqued main caps to 65ft lbs. Torqued rod bolts to about 24ft lbs. No motor wont turn over! Checked rod bolts and engine wont turn over if I tighten them past about 12ft lbs!!! Pistons are in right. It has to be something with connecting rods. Are my caps on wrong? Bearings were installed right. I installed them with the numbers on the cap and on the rods on the same side like it says to in my chiltons manual. SOMEONE PLEASE HELP.
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From: e-burg
my first thought would be are ur bearings the right size? sounds like u got to big of underground brearings sounds like u got .020" under when u needed .010" or somthing like that did u plasticgauge everything to check ur clearances if not thats where i would start
More Turbo
Joined: Dec 2003
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I seen that happen to a first time engine years back.A buddy of mine had the same problem and we found out he had the rod caps mixed up.Are the caps matched to the right rods?Also,are they backwards?The stamped numbers on the cap & rod should be together.
Hotshot
Joined: May 2004
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From: The hills of No. Calif.
I'd agree. Happened to me years ago with my first rebuild. Had the crank ground .010 under, and they gave me .020 bearings with it. I didn't check, never occured to me that could happen. Easy enough to pull a bearing and check, the undersize is stamped right on the back, near the end. -TD
Fleet Mechanic
Joined: Mar 2004
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From: Kansas
Originally Posted by jesse1385
It has to be something with connecting rods. Are my caps on wrong? Bearings were installed right. I installed them with the numbers on the cap and on the rods on the same side like it says to in my chiltons manual. SOMEONE PLEASE HELP.
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Hotshot
Joined: May 2003
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From: south louisiana
You could also have mixed up the main caps. They're numbered 1 thru 5, numbers 3 & 5 are obvious as to where they fit, numbers 1, 2 & 4 can be installed in the wrong position. Also, the rods, in addition to having the numbered sides together, also need to be facing out toward the block for the cylinder banks they fit on. As for plastigauge, I've never used the stuff and never had problems, as long as the bearings are the proper undersize and the crank turns freely. Once all the pistons and rods are in place, you'll need a breaker bar and socket to turn it, but it should also turn somewhat freely without undue force.
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The main caps are installed correctly. I checked the rod bearings and they say .001US, so they should be good since the crank was polished. I never took the pistons of the rods so they are right. The pistons were installed with the arrows on the bottom facing towards the front on the block. What can it be?
