620 rebuild

[Brad in VA]

Hello, im rebuilding my 620 John Deere and was wondering if you can get a complete rebuild kit for them? Like on here all it gives or atleast lists is the pistons rings connecting rods and berings... id need the gaskets and all to... do i need to just order them seperate?

 

[Jake Winn]

there is no rebuild kit available. you can buy piston kits with rings and pins, gasket kits from Deere and any other common repair part. YT has the piston kits, not sure about the bearings.

What is the problem with the engine? If you are going to pull it down, you should rebuild the head (valves, guides, seats) as well. Its a worthwile investment.

The bearings are also easily found.

 

[Brad in VA]

the heads at the shop being gone through now. The motor was locked up was the problem. the manifolds were rotten as well. I found a gasket kit for 100, does that sound reasonable?

 

[Jake Winn]

Yeah, thats not out of line at all if includes the manifold, rocker cover, head gaskets, and lead washers.

Are the cylinders pitted, or can they be honed out? If they need to be bored, then YT has pistons/rings/pins/keepers in a kit for a reasonable price. They also have manifolds.

 

[GlenT]

You might want to fix a problem with the main bearing oil galleries on the 520 through 730 series. Here is a previous post:
http://www.ytmag.com/cgi-bin/viewit.cgi?bd=jd&th=324348

This problem can cause the engine to destroy itself.