Hey yall can't get an answer on my other post, but today I found metal shavings all in the bottom of the oil pan on my loboy, I took the rod bearing off to inspect them.
They all had some small scratches and small pits, nothing big enough to catch my fingernail on.
I noticed that with the #2 and #4 cylinders down, and the bottom bearings off, I can move the connecting rods side to side on the crank about a 1/16" is this normal?
Thanks
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Rod Bearings question
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Re: Rod Bearings question
Plastigage the rod bearings. While you have the rod caps installed take a feeler gauge set and measure the side to side movement on the rod journal.
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Re: Rod Bearings question
Eugene, What is Plastigage? I was just looking in the Blue Ribbon Service manual and saw the same thing, thanks
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Re: Rod Bearings question
In one of my reference books, side to side rod and main bearing clearance. Minimum .004" and maximum .008"
Plastigage, easier to search Google than to explain.
Edit: Look it up on the internet. Internet will have photos of the material and demonstrations on how to use.
Plastigage, easier to search Google than to explain.
Edit: Look it up on the internet. Internet will have photos of the material and demonstrations on how to use.
Last edited by Eugene on Sat Mar 14, 2015 11:40 pm, edited 1 time in total.
I have an excuse. CRS.
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Re: Rod Bearings question
Plastigage is cheap to buy and available at any auto parts store. I think you'll need the green. Different thicknesses are different colors.
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Re: Rod Bearings question
what would be the process for measuring the side to side? is it as simple as pushing to one side, measuring that side, then pushing to the other and measuring the first side again, then calculate the difference?
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Re: Rod Bearings question
Only need to slide the rod with rod cap connected to one side. Feeler gauge and measure the side opposite the direction the rod was moved. That measurement is your side to side clearance.Eoghan wrote:what would be the process for measuring the side to side? is it as simple as pushing to one side, measuring that side?
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Re: Rod Bearings question
Craig, you cut a piece of plastigage and put it on your crank, then clamp the main or rod cap to it. It'll smash the plastigage to a width you reference on the sleeve of paper it comes in, and use that to determine your clearances.
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Re: Rod Bearings question
Two different issues. Plastigauge will measure the bearing clearances between the bearing and crank. It gets squashed flat and the width of the squashed plastic gets compared to a chart to determine bearing clearance.
As for the side-to-side, what year is your engine? They changed rods and cranks at one point. The newer rods were thinner. You could use the newer rods on the old crank but you could not use the old rods on a newer crank as they are too wide. The extra play must not have been a concern since the newer, thinner rods were service replacement items of early engines as long as the proper bearings were used. So, early rods require the early bearings, later rods, later bearings. ENGINE number 261718 and up had the newer rods. In any case, there is always some side-to-side on rods. The piston keeps them centered. Cranks have thrust bearings to them from moving back and forth, but that is a completely different issue.
As for the side-to-side, what year is your engine? They changed rods and cranks at one point. The newer rods were thinner. You could use the newer rods on the old crank but you could not use the old rods on a newer crank as they are too wide. The extra play must not have been a concern since the newer, thinner rods were service replacement items of early engines as long as the proper bearings were used. So, early rods require the early bearings, later rods, later bearings. ENGINE number 261718 and up had the newer rods. In any case, there is always some side-to-side on rods. The piston keeps them centered. Cranks have thrust bearings to them from moving back and forth, but that is a completely different issue.
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Re: Rod Bearings question
Bob, it is a 57 Loboy
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