1991 Case IH 275 Rebuild

[JohnIH275]

Hello. This is a rebuild thread for a 1991 Case IH 275 tractor I just purchased.

I'm like many and glutton for punishment it seems.
This is my first diesel engine and diesel engine rebuild, AND my first tractor I've ever owned. :thumbsup:

Tractor Specs:
1991 Case IH 275
2 wheel drive
Hours - 2100
No power steering
Engine - Mitsubishi K3M 31 HP 3 cylinder diesel (very UN-common)

I am rebuilding because the PO neglected it and left it lightly flood by a river here in NC a few months ago.

First thread about the tractor:
http://www.tractorbynet.com/forums/parts-repairs/286371-flooded-1991-case-ih-275-a.html

Current Status:
The whole front end of tractor is torn down.
Crankshaft, pistons, block, and head are at a good machine shop being machined.
Block is in good shape and the crankshaft will need to be turned.

I'm searching for all the parts I need to rebuild - found someone, here actually, Sheaffer's Town & Country Tractor that can source most the parts. He's been very helpful and one of the main reasons I decided to rebuild rather than salvage this tractor!

In the meantime I'm cleaning the remaining parts and hardware getting ready to rebuild.
The gear case, hi-tran. case, and rear axle all seem to be in good condition. i.e. no water.


I just returned from the machine shop and they need more accurate machining clearances for the crankshaft and cylinder bore.
The service manual specs. - attached - are not accurate to the level they need to turn the crankshaft and mic. the bore.

They said it will be quoted as two numbers out to 4 digits, i.e. 2.3345/2.4343 or something similar.

Does anyone know where I can get accurate machining data - the correct clearances?

 

[JohnIH275]

I now have the correct cylinder bore, piston, and ring clearances.

But am still looking for crankshaft clearances.
Have standard diameter for the crank, but still no clearances for the machine shop.

Crankshaft standard diameter shows:
Connecting rod standard diameter - 1.8898 in
Main journal standard diameter - 2.2441 in

Just a long-shot, anyone know the crank clearances or have them noted down somewhere?

 

[sixdogs]

Remarkable project and congrats on the clear thinking and decisions made. I owned a 265 HC once and it had one of the nicer running engines I can recall.
This looks to be an exciting thread. Photos always very helpful.