Reproduction Parts for 1916-1964 Chevrolet Passenger Cars & 1918-1987 Chevrolet & GMC Trucks


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The crankshaft is out of round. Fit bearing at the point when it is tight and keep it on the tight side - where tapping with little hammer is required to move it back and forth.


Gene Schneider
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My name is Toms

you are only postponing the inhibitable..... The crankshaft must be round. Your engine will not be reliable, sorry very important.

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Thats the advantage of the Chevrolet babbited rod bearings. If not too much out of round the rod will stay tight for a long time.


Gene Schneider
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Originally Posted by Chev Nut
The crankshaft is out of round. Fit bearing at the point when it is tight and keep it on the tight side - where tapping with little hammer is required to move it back and forth.
I measured the "egg shaped" rod bearing journal on the crankshaft (rod number 5) with a micrometer today.
I found out that this journal is worn about 0,02 millimeter (the smallest diameter is about 0,02 millimeter smaller than the biggest diameter), which means it is about 0,0008" out of round.
I understand this is far from ideal.. But in the repair manual it says that "if the journals exceed 0,001" out of round or taper, the crankshaft should be replaced".
Since I am just under 0,001", I hope I might get away with it for a while... At least I will give it a try.

Last edited by AMS; 02/23/18 03:10 PM.
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We used to tighten them up with crankshaft .002" out of round and they lasted for many thousands of miles. Never to worry.
The worst thing that could happen is the bearing/rod loosen up a bit after 20,000 miles.

Last edited by Chev Nut; 02/23/18 03:48 PM.

Gene Schneider
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Originally Posted by Chev Nut
We used to tighten them up with crankshaft .002" out of round and they lasted for many thousands of miles. Never to worry.
The worst thing that could happen is the bearing/rod loosen up a bit after 20,000 miles.
Thank you very much for your information and help!

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Well good luck to you and the rebuilt engine. May it provide you with many miles of enjoyment. I hope you enjoy your 1934 Master as much as I enjoyed mine.


Gene Schneider
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This may be your problem. Sounds like number 5 needs to be looked at very closely. If you can get it to a shop have then "mike" it to see.

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