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aquifer 
Samba Member
Joined: August 30, 2021
Posts: 319
Location: Nebraska
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 Posted: Today 7:16 am Post subject: Crankshaft end play shim clarification |
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I know that three shims are required. The thickest shim I found online is .36mm. Does that mean that the thickest stack I can use is .36mm x 3 shims to achieve a goal of .003” - .006” end play? So if I need more shims than that, it means I’ve reached the max wear tolerance?
Or perhaps thicker shims are available, so I’d like to know what is the max shim stack thickness that is advised?
I have a stock 1974 1600dp in one of my 67 beetles. It has excess end play (can hear and feel it when I push/pull on the pulley), so I’ll have to pull the engine eventually. I don’t know what’s in there for shims, or the condition of the bearing, so I’m just getting my head around the issue.
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glutamodo
The Android
Joined: July 13, 2004
Posts: 26523
Location: Douglas, WY
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| Posted: Today 8:23 am Post subject: Re: Crankshaft end play shim clarification |
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My guess is it not end play at the shims that you are seeing there.
It is fairly common for the thrust bearing to become loose in the saddle it sits in the engine case, and when that happens, it becomes difficult to asses what the actual end play is, because you'll be seeing thrust bearing movement, not end play.
You won't know if that is what is going on until you pull the flywheel and have someone else push pull on the crank pulley while you watch/feel the thrust bearing slide back and forth.
A newly built engine with a new, tight, thrust bearing usually has the end play set correctly. So it's a good idea to always keep or at least measure your existing stack of shims whenever you encounter thrust bearing movement and just keep with that. (wear, where the three shims are, is minimal)
A stack of thicker shims will NOT fix thrust bearing movement.
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Andy T.
"What is Glutamodo, Horror of Toyko, besides total, fiendish, quality-a-you brain!" |
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aquifer
Samba Member
Joined: August 30, 2021
Posts: 319
Location: Nebraska
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| Posted: Today 1:18 pm Post subject: Re: Crankshaft end play shim clarification |
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| glutamodo wrote: |
My guess is it not end play at the shims that you are seeing there.
It is fairly common for the thrust bearing to become loose in the saddle it sits in the engine case, and when that happens, it becomes difficult to asses what the actual end play is, because you'll be seeing thrust bearing movement, not end play.
You won't know if that is what is going on until you pull the flywheel and have someone else push pull on the crank pulley while you watch/feel the thrust bearing slide back and forth.
A newly built engine with a new, tight, thrust bearing usually has the end play set correctly. So it's a good idea to always keep or at least measure your existing stack of shims whenever you encounter thrust bearing movement and just keep with that. (wear, where the three shims are, is minimal)
A stack of thicker shims will NOT fix thrust bearing movement. |
Ok I see what you’re saying. It may be that the bearing itself is what is allowing the excess movement. What I’m calling end play may not be the problem. Same symptom but a different cause. Ignorantly adding shims may actually cause more damage because the shims might be too tight between the flywheel and the bearing and unable to move. The crankshaft might not be able to turn if the shims are too tight. Meanwhile the “end play” would still be there.
I understand the concept now. I’ll pay attention to that and make sure I know what I’m seeing when I get around to doing this project. Thank you!
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Parts needed:
Front & rear NOS or used OEM door panels for a '67 in the original Gazelle color (dark tan/light brown).
Also looking for used white headliner pieces, both perforated and non-perforated. |
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Glenn
Mr. 010
Joined: December 25, 2001
Posts: 79406
Location: Sneaking up behind you
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| Posted: Today 1:40 pm Post subject: Re: Crankshaft end play shim clarification |
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Sounds like a rebuild is in it's future.
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Glenn
74 Beetle Specs | 74 Beetle Restoration | 2180cc Engine
"You may not get what you pay for, but you always pay for what you get"
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עַם יִשְׂרָאֵל חַי |
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MrGoodtunes
Samba Member
Joined: May 14, 2012
Posts: 1015
Location: South Florida
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