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Re: Crank Timing Gear

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Jeremy in DE

03-13-2014 10:22:38

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Steve (and everyone else):

I thank you for your time and helpful comments. I pulled the gear off this morning and if possibly I'd like your help interpreting the results.

The piece that was getting chewed up was clearly home made by someone sometime in the past. (See picture, this is after I spent a lot of time cleaning it off and smoothing it out). At first I assumed that someone tried to make a home made thrust plate (#4). However, behind it is what looks to me like the actual thrust plate. (See photo). Behind the true thrust plate (or whatever it is) is the bonzish colored piece which I assume to be #2, the thrust washer. It has the pins in it as in the diagram. Behind it are several shims also as pictured in the diagram.

So, when I took the home made piece off and gently press the gear back into place it aligns perfectly with the cam gear, it cuts out the end play (thanks for reminding me I must make sure I leave some, the manual says .003 to .007). And the crank pulley is still longer than the end of the crank as you noted it needs to be to be.

Why would someone have made this piece and put it in there. And is there any chance I can just leave it out and run it from here on? It has to be better than it was (gears not hitting that piece, end play reduced) even if it's not ideal. I want to read more about the flanged bearing option, but until then?

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03-13-2014 13:27:01

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 Re: Crank Timing Gear in reply to Jeremy in DE, 03-13-2014 10:22:38  
At this point I think I would put the gear on without the shim, put the pulley and slinger on without the cover and tighten the front bolt. Then check to see how things line up and much end play you have.

I suspect there is a problem with the thrust bearing surface on the crank, as in it's worn beyond limits. Most likely it has gotten worse since the homemade shim was installed. If it had a fiber washer, it may be completely gone. But, if they were trying to tighten the end play, that shim would have had no effect, way I see it.??
To reduce the end play you add shims behind #2. That will work if it's somewhere near tolerance, not if it's 1/8 inch or so.

Still, I would try and see, it could be OK...

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Jason S.

03-13-2014 10:40:29

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 Re: Crank Timing Gear in reply to Jeremy in DE, 03-13-2014 10:22:38  
The TO-30 had both an inner and outer thrust washer and shims to control the endplay. It looks like somebody didn't have shims or was too cheap to buy any and used a homemade one. I would just get the proper thrust washers and shims and see how if you can get the end play set right.

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Jason S.

03-13-2014 10:46:47

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 Re: Crank Timing Gear in reply to Jason S., 03-13-2014 10:40:29  
Even if that homemade shim did work it looks like its in the wrong order. The order from the block should be inner thrust washer, shims,outer thrust washer,thrust plate, then the gear

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