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Plastigage?

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Blake

11-28-2001 20:17:10




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My dad is fixin and old tractor and he says he's gonna plastigage the bearings or something....what's that mean?? I didn't want to ask him....I just went along like I knew what he was talking about....HEHEEE....thank you for helping me.




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scotty

11-29-2001 09:35:33




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 Re: Plastigage? in reply to Blake, 11-28-2001 20:17:10  
Blake,
Both Scotty NY and Lazyhorse are on the money,
but what they really didnt say was that you will
be reading the amount of clearance between your
bearings and your crankshaft with that flattened
piece of plastigage. Machineshops use inside and
outside micrometers which can be expensive for
the backyard mechanic!
scotty



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ScottyNY

11-29-2001 05:06:23




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 Re: Plastigage? in reply to Blake, 11-28-2001 20:17:10  
It's a plastic thread (They make several sizes) that you put into the gap you want to measure. When you clap everything back together, it crushes the plastic thread, mashes it flat. You take it all back apart and compare the width of the now flat thread to the chart that's on the envelope the p-gauge comes in to find out just how wide/narrow a gap it was that made the thread that flat! Wickedly simple concept, and for most purposes sufficiently accurate at a reasona ble cost. Great stuff!

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LazyHorse

11-28-2001 20:38:40




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 Re: Plastigage? in reply to Blake, 11-28-2001 20:17:10  
Plastigauge looks like a peice of green plastic thread. You put it in the space between the shaft and bearing, then torque it down. After that ya open the bearing back up and read the width of the plasti gauge with th indicator on package it comes in. This will let you know if your bearings are the right size for the application, or if you need to go oversized.



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