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overhaulin'

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Matt in MI

04-11-2005 10:14:57




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Tore down the 57 IH 350U yesterday. Head gasket was bad, Head needs rebuildin and think it will need sleaves and pistons also. My Question is #3 rod bearing appears to have rolled. Can I plasi gauge the crank in block or do I need to split the tractor to pull it first. Never used a plasti gauge before and would like to know before I build splitting stands. And if I do have to split it how hard is it to put a new T/A in? Thanks for any info you care to share. Matt

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El Toro

04-11-2005 15:32:24




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 Re: overhaulin' in reply to Matt in MI, 04-11-2005 10:14:57  
If that journal with the spun bearing is galled,
feels rough to touch compared to the other journals, I would pull the engine and have all
the journals ground undersize. Have someone from your local machine shop to look and measure it with a micrometer. Our local shop could grind a journal undersize still in the vehicle. Not sure if they're still doing it. Hal



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janicholson

04-11-2005 11:43:59




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 Re: overhaulin' in reply to Matt in MI, 04-11-2005 10:14:57  
Plastigauge is really only usable on known round journals (the smooth metal of the crank). using it on a journal that has had issues is not advised. Use a micrometer that is dependable, and check the journal diameter in at least eight locations. Around the journal in three locations, and similar locations toward front and back of engine (not in the middle of the journal). All dimensions should be within .0005" to consider the journal good enough. If it is not in spec. it has been possible around here (MN)to get them polished on the tractor. If not it is regrind time (at least for that journal). a new bearing on a eggshaped journal will not hold up at all.
JimN

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MeAnthony

04-11-2005 11:38:16




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 Re: overhaulin' in reply to Matt in MI, 04-11-2005 10:14:57  
Old is correct, mic is the best option. However, if you don't have one available, you could slip in a new bearing and use the plastigage in at least 3 different spots in the rotation. Say you torque it down @ TDC, remove cap, measure 'gage. Then spin crank to 4 o'clock position. Insert new plastigage strip in the same place on the bearing. This will give clearances in relation to a single spot on the bearing in relation to varying spots on the crank, as you move the crank through its rotation. A third check at the 8 o'clock position, and you have 3 values, based on one given (new bearing) in relation to one variable (crank journal). If the 3 values match, the journal is good.

Or maybe I've just been the victim of barnyard creativity. Dunno for sure, but it worked for me.

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RustyFarmall

04-11-2005 11:35:44




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 Re: overhaulin' in reply to Matt in MI, 04-11-2005 10:14:57  
If a bearing rolled, or spun, that particular crank journal will show abnormal wear, scratched, gouged, etc. If you are not seeing any of that, and the journal feels smooth to the touch, even after dragging your fingernails across it, then it is probably OK. Just to be safe though, get somebody to come out and measure the crank with a micrometer, it's the only way you will know for sure.



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old

04-11-2005 11:15:04




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 Re: overhaulin' in reply to Matt in MI, 04-11-2005 10:14:57  
I'd mic them to check



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