ROD BEARINGS

HIVEY · Oct 20, 2014

I MEASURED MY CRANKSHART TO REPLACE THE ROD BEARINGS.THIS IS WHAT NUMBERS I GOT I USED A DITIAL CALIBER.
#1 2.090, 2.093.5, 2.091.5 ,2.092
#2 2.090, 2.089.5, 2.093.5, 2.093.5
#3 2.093, 2.092, 2.092, 2.088
#4 2.0915 ,2.095? 2.090, 2.090.5
STANDARD SIZE IS 2.094-2.095
CAN I SURE STANDARD SIZE BEARING OR DO I NEED TO GO TO OVERSIZE AND WHAT SIZE.
ANY HELP OUT THERE.I MEASURED IN 4 LOCATIONS

JCinKY · Oct 20, 2014

While measuring with a micrometer would have been more accurate, I would have the crank ground with the measurements you provided.

The bearing shells should be stamped on the back with the oversize; STD for standard, 010 for 0.010 over, and so on.

Your measurements dipped below 2.089" which is out of tolerance for crank journal clearance; 0.001 - 0.003.

Have it ground 0.010 under and throw on some 0.010 oversize rod bearings.

You may be able to get 0.001 oversize just to buy you some time, but since its already out...do it right and forget about it.

Ultradog MN · Oct 20, 2014

Generally speaking, a digital, dial or vermeer caliper is not accurate enough to measure a crankshaft.
You need good micrometers that have recently been checked against a standard.

TheOldHokie · Oct 20, 2014

(quoted from post at 10:49:20 10/20/14) I MEASURED MY CRANKSHART TO REPLACE THE ROD BEARINGS.THIS IS WHAT NUMBERS I GOT I USED A DITIAL CALIBER.
#1 2.090, 2.093.5, 2.091.5 ,2.092
#2 2.090, 2.089.5, 2.093.5, 2.093.5
#3 2.093, 2.092, 2.092, 2.088
#4 2.0915 ,2.095? 2.090, 2.090.5
STANDARD SIZE IS 2.094-2.095
CAN I SURE STANDARD SIZE BEARING OR DO I NEED TO GO TO OVERSIZE AND WHAT SIZE.
ANY HELP OUT THERE.I MEASURED IN 4 LOCATIONS

Despite teh fact your measuring with a digital caliper it is clear you have significant wear that exceeds the wear limits given in the FO-4. I second the recommendation that you have the crankshaft reground and fit [u:cd66eacf92][b:cd66eacf92]UNDERSIZE[/b:cd66eacf92][/u:cd66eacf92] bearings. Fitting standard bearings isn't going to fix your problem for long if at all....

TOH

J.Everett · Oct 20, 2014

The one quick way to see how much wear you currently have is to use plasta guage on the old bearings. This will tell you the total wear clearance you have now. I recomend that someone experianced use a micrometer and measure the size on the crank shaft, then you will know what bearings to order and if the crank needs to be reground.

teddy52food · Oct 20, 2014

If you get it ground now, it should clean up at .010. If you run it with new inserts the oil pressure will be low and it will wear faster, then it may have to go to .020. With those readings, the mains need grinding too. Do it right the first time.

ASEguy · Oct 20, 2014

Crankshaft journals (main and rod) are measured for actual diameter, out-of-round and taper. All journals need to be measured and considered for a proper repair, not just the rod journals. How did you measure them? Those numbers fluctuate a great deal and ,if correct, would require at a minimum crankshaft regrinding to an undersize as stated.

ROD BEARINGS

HIVEY

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JCinKY

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Ultradog MN

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TheOldHokie

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J.Everett

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teddy52food

Well-known Member

ASEguy

Well-known Member

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