MM 425

Bill from Scotland · Jun 17, 2014

I have a 425 diesel that may have a damaged bore due to broken rings. I have a replacement piston and rings (standard, can I have the bore enlarged and a liner fitted to allow it to be taken back to standard? Does anyone do a liner for these 425 engines that I could have pressed into place and bored back to standard? No one in Scotland holds spares for MM tractors so I thought this would be the simplest repair option even if I had to get a liner sent from the US, much less shipping than a replacemnt jug.
Any thoughts welcome.
Bill

Curt Cooke · Jun 17, 2014

Yes it can be done. Wish I could tell you exactly where to acquire such a thing but I don't know. I've had several cylinders bored to take a sleeve but my local machine shop has always handled those details.

molinegb · Jun 17, 2014

Would be more economical to used 4 3/8 pistons out of a G900 or any model with 451 motor.

T.R.K. · Jun 17, 2014

I have had several U/283 blocks sleeved and bored back to standard successfully just to avoid having to find/pay for oversize pistons, just like you are thinking of doing.

I live in North Carolina, U.S., which is about as remote an area for MM parts as Scotland is.

I suggest check around at some automotive/heavy truck machine shops, they usually have sources for "repair sleeves" and know the capacity of their equipment for doing such work.

moresmoke · Jun 17, 2014

Ive had a 504 done. The machine shop provided the sleeves.

jr1983 · Jun 19, 2014

Toms agridiesel has what u need. Has complete overhaul kits and repair sleeves. Has over as iced pistons on request.

MM 425

Bill from Scotland

Member

Curt Cooke

Member

molinegb

Well-known Member

T.R.K.

Well-known Member

moresmoke

Well-known Member

jr1983

Member

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