955 motor in 855

[dfkrug]

Where did you get the oversized pistions and rings? Are they JD parts? Do you have a part numbers? I found a shop that does Diesel engine machining so that might be a cheaper option. The $2,500-$3,000 came from the JD dealer. I haved worked on motors before so I might look at that option as well since this is a winter project.

All my parts came from JD. Shop around for your best JD dealer for parts.
JDParts.com is supposed to quote you prices for the dealer you register
with. The last 955 I did was years ago, but pistons for the latest JD
I recently finished were about the same price.

Even tho a dealer may quote you for the engine rebuild, they probably
sub it out to a machine shop/engine builder. That means you could take
your engine there directly, or better yet, DIY. All you HAVE to pay for
is parts, boring, and block cleaning.


From the parts book:

AM877970 PISTON RING KIT 3 .25MM (.010") OS
AM878245 PISTON RING KIT 3 .50MM (.020") OS

Note that if you buy bare pistons and rings separately, it will cost MUCH
more.

 

[Brimstone10x]

You could just hone the cylinders and throw new std pistons and rings in it if the bores are not to bad. You would still have to remove the engine but could leave the crank cam injection pump ect in place. I know I know its not the 100% correct way to do it but it would most likely run like new for a few years for very little expence if you do it your self. The 955 engine would most likely be a lot of headachs to make work and still end up with a mutt. just my two cents.

 

[WIJohnDeere855]

Thanks everyone. It sounds like the route I am going is to bore it and put new 0.25 pistons and rings in it. I really want to keep the original motor in it.

 

[WIJohnDeere855]

Any suggestion on what JD book (ie. JD shop manual or Yanmar engine book or ??)covers specs and tearing down the motor to rebuild it? Google searched it but most books wont tell how specific they get.

 

[dsmau]

The deere book for this engine is CTM3

 

[dfkrug]

Any suggestion on what JD book (ie. JD shop manual or Yanmar engine book or ??)covers specs and tearing down the motor to rebuild it? Google searched it but most books wont tell how specific they get.

This IS an issue. The JD tech manual (TM1360) is in no way complete.
There are other manuals that it makes reference to, including the engine
manual that DSMAU quotes. I have the TM and parts PDFs, but not the
CTM3. When I bought my first 955, I also bought an I&T manual on the
7/8/955, but it dealt with very little except the engine. It was a good
manual for the engine rebuild, and I got it for only $15 or so (Overstock.com).
There are several on eBay for $25-30. I really needed that book since the
first 955 I bought came disassembled, with the engine parts thrown in a
box.

 

[Mechanos]

All I'm gonna say is Google it.... never know what you just might find on the internet.

 

[dsmau]

All I'm gonna say is Google it.... never know what you just might find on the internet.

Got it! Like this for instance ? :thumbsup:
CTM3 deere filetype=pdf - Google Search

 

[WIJohnDeere855]

Thanks again everyone for the help. I learn something new everyday. What did we do before the internet!?!?!?

 

[WIJohnDeere855]

Found a local engine rebuiilder that specializes in Diesels and will be doing the boring and going thru the valves for me.