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Y block end play?

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Old Nov 10, 2019 | 01:43 PM
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Y block end play?
Anyone know what the end play should be on a 292 y block with a 312 crank?
 
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Old Nov 10, 2019 | 02:52 PM
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Pg. 97 Charles Morris Y Block rebuild book sez "Endplay should not exceed .010 inch; .002 to .006 is the acceptable range."

It may be online, parts of it anyway. There are some techniques described how to accurately measure therein.
 
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Old Nov 10, 2019 | 02:58 PM
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Ouch
My end play is 40 thousands
 
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Old Nov 10, 2019 | 03:30 PM
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@hiball3985 Ask this guy, or @charliemccraney there's a way to do it described in the book but it doesn't sound good any way ya slice it.
 
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Old Nov 10, 2019 | 05:38 PM
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Sure sounds like your thrust bearing is history. Is this a new build or how old is the engine? Hopefully the crank thrust service hasn't been damaged or was machined wrong.
 
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Old Nov 10, 2019 | 06:16 PM
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Can someone 'splain to me why this is an issue? Can't the thrust bearing be replaced? Or different thicknesses available?
 
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Old Nov 10, 2019 | 06:26 PM
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It's not an issue and can be replaced providing the crank thrust surface is good and still within spec. I don't know if an oversize one was ever available. Also finding why it failed is important
 
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Old Nov 10, 2019 | 06:30 PM
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Rngine
Has 2500 miles on engine since built
 
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Old Nov 10, 2019 | 06:38 PM
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Is it a stick or auto?
 
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Old Nov 10, 2019 | 06:38 PM
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OK. I thought it was just normal wear, high mileage thing.
 
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Old Nov 10, 2019 | 08:40 PM
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Engine
T98 4 speed I believe
 
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Old Nov 11, 2019 | 06:16 AM
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OK, that eliminates a torque converter issue. With out tearing it down it would just be guessing but .040 isn't normal wear with that mileage. Have you contacted the engine builder yet?
 
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Old Nov 11, 2019 | 03:36 PM
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The 312 crank would have to have had the mains turned to the 292 size. Maybe they widened it in the process by mistake.

How are you measuring the end play?
 
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Old Nov 11, 2019 | 07:52 PM
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End play
Measuring the movement of crank by the main bearings in front of #4, and 8 conn rods. Could be measuring wrong but seems quite a bit of movement of crank
 
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