Timken Bearing Replacement

Bottom End (crankcases and crankshaft)
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Eric S
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Timken Bearing Replacement

#1

Post by Eric S »

I checked the sprocket shaft endplay on my 59 engine today with a dial indicator. I have a shade over .0006 with out the sprocket installed. Are there any special tools required other than a press to remove and a installation tool to replace. I assume that this is out of limits for end play? Thanks Eric
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Re: Timken Bearing Replacement

#2

Post by NightShift »

Dear Eric,
You scare me to death when you say press.
They used to make two thousandths shims so I really think maybe you shouldnt fix it.
A lot of folks used to worry about zero endplay on a fresh bearing.

R'spectfully,
Eric S
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Re: Timken Bearing Replacement

#3

Post by Eric S »

:) Not as much as I scare me most of the time! I assumed that a press would be used to remove the flywheels from the left case. I didnt know if upon inspection of the bearings if they could be reused? Every else looks ok in the cases except for the loose clearance in the shaft. My service manual shows this checked with the engine sprocket removed but the text says to check with the sprocket on. I have no compensator and there is a seal on the shaft (Colony?) with a spacer instead of the slinger. Thanks Eric
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Re: Timken Bearing Replacement

#4

Post by Cotten »

Eric!

The commonly prescribed procedure of pressing out the flywheel assembly against the outside edges of the case carries great risk.

Instead, a screw-press consisting of a plate with a centerscrew upon the shaft, and holes in the plate for bolts that fasten into the primary bolt holes, will push the shaft through without a wide field of stress upon the casting. Essentially, it pulls the case off the shaft.
(Even if weakened threads in the case are pulled out, a Helicoil is a much easier repair than a cracked case!)

My tooling is at the shop, so I cannot post a photo, but it basically adds up to something like a clutch hub puller.

The screwpress that is used to install the assembly serves better than a "sprocket bolted on".
The pre-load would take up endplay.

.0006" sounds like it has just broken in, and little more.

....Cotten
Eric S
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Re: Timken Bearing Replacement

#5

Post by Eric S »

Thanks Guys, Everything feels good and it spins nice are you saying at .0006 to leave it alone? Thanks
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Re: Timken Bearing Replacement

#6

Post by steinauge »

If it is indeed .0006" leave it alone.If you meant.006" you are still .001 under the wear limit and as long as the bearing is quiet it is fine.Normal new setup end play is about .0005" to .004" with (IMO) .0005" to .0015" being ideal.
Eric S
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Re: Timken Bearing Replacement

#7

Post by Eric S »

Sorry for the confusion .I meant 6 thous. .006 . Sorry poor math skills (WV Hillbilly) Without the sprocket mounted. Eric
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Re: Timken Bearing Replacement

#8

Post by Cotten »

Eric!

An order of magnitude makes a difference.

I advise replacement.

....Cotten
Eric S
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Re: Timken Bearing Replacement

#9

Post by Eric S »

Can anyone advise a good place that I might ship this bottom end to for a check and rebuild? No real place in my area. Any ideas what an average cost is ? Thanks! to all Eric
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