John Deere 850 Aka yanmar 2500 rebuild

[stinson89]

I started a rebuild on my little 850(yanmar 2500). Back story is it got hot the other day and seemed to have blew the head gasket , so I dove into the motor and found what looked like a bad head gasket, small groove in middle cylinder wall and the connecting rod bearing in pieces all on the middle cylinder. The rest looked fine, my question is what would you guys do just rebuild the one cylinder and head gasket or do the whole thing. I’m trying to do this budget friendly and also it looks like the cylinders have been sleeved but not really sure how you tell this is my first engine rebuild so kinda learning as I go. Also the head doesn’t look to be cracked to me I’m Hoping to just put in a new rod bearing and cylinder sleeve with a new head gasket and be done

 

[winston1]

How many hours? Can't really make a solid recommendation for you but you might look at this. Not a bad price. Might have to add one cylinder sleeve with it. SFEK-2500 INFRAME ENGINE REBUILD KIT

 

[stinson89]

5349 hours that’s what I was doing is in frame rebuild. What’s your thoughts this is the first time I’ve ever done anything like this, im pretty far into now

 

[stinson89]

My motor plate says 3T80j will that kit work

 

[careyo63]

Standard parts for Fredricks they refurbish the YM2500. Wet sleeve WS-80 If I was planning on keeping it I'd pull the sleeve and be done with it!

 

[winston1]

My motor plate says 3T80j will that kit work

I can't give you a definite answer about the kit. I would ask Southern? If you have over 5000 hours I think I would replace all 3 sleeves.

 

[bmaverick]

5349 hours that’s what I was doing is in frame rebuild. What’s your thoughts this is the first time I’ve ever done anything like this, im pretty far into now

AMAZING the amount of hours prior to a rebuild. I hope my 3T80 engine does just as nice.

Do you need repair manuals for free, they are on the YTOG for your machine. This would take out any guess work on the overhaul.

 

[stinson89]

Got everything back together almost and one of the studs that hold the rocker arm assembly on snapped. I’ve tried everywhere including John Deere and no one has one, does anyone have any ideas on a different one I can use or something.

 

[winston1]

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[ponytug]

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@winston1 Is that the stud that @stinson89 needs? It comes up as an o-ring for me...

All the best, Peter

 

[winston1]

It does come up as an o-ring one time but mostly as a bolt. That part number is out of the John Deere 850 parts manual. The John Deere 850 and Yanmar 2500 pretty much share the same engine. No warranty on my part that it is correct is my feeling is is correct.

 

[careyo63]

No part number for it showing anywhere looking at couple Dia. and parts. Call Fredricks they should have it no doubt. They refurbish that model and just might have a real good idea.?

 

[MTGreen]

A stud is a simple part for a competent machinist if you can't find one

 

[bmaverick]

Got everything back together almost and one of the studs that hold the rocker arm assembly on snapped. I’ve tried everywhere including John Deere and no one has one, does anyone have any ideas on a different one I can use or something.

It you got the part in hand, take the stud to Fastenal in a popular town. I was able to find replacements from them for my rear axle.