JD 850 yanmar Engine Crankshaft

[DallasA]

I am in need of a crankshaft or engine for a John deere 850 with a Yanmar Diesel engine. John Deere has told me that it is no longer available thru them. Can anybody help me? The engine is a 3T80J 605-881-3300 Dallas

 

[Ron D.]

Is it broken, or can it be machined? If it can be machined I would take it to an engine machine shop.

If it's broken, I would contact Hoye Tractor, a frequent contributor to this site and great people. They might be able to point you in the right direction. Others that might be able to help are LMTC and Tractor Ernie, all are knowledgeable.

Good luck, let us know what happens.

 

[DallasA]

It is not broken. However I took it to a machine shop and they cannot grind the journal within specs. They would have to take 040 off in order to finish it. Bearings are not available for that amount. I will contact Hoye Thank you. Dallas

 

[cowboy357]

I,m not Posative but I beleive the right shop could weld up the Journal & regrind it back to specs . I,m Pretty sure someone here said it could be done, But I cant find the post. Best of luck. Bob

 

[LMTC]

DallasA, check your messages on this forum.

 

[cyberflyrg]

Crankshaft welding is a common technique in the racing business, we screw up cranks all the time with spun bearings, blown engines, broken rods, etc.
Id check with your local speed shops, maybe NAPA, or a crankshaft rebuilder. It takes a special welder and crank grinder to do this, the welding is actually done underwater and with an eccentric machine that can follow the crankshaft as it rotates around. I had a chevy 454 crank done last year and had all for the journals done for $355 and had them brought back to std. size. That crank can rev at 7000+ RPMs and works perfectly. Hope this helps.. ron.

 

[cowboy357]

Thanks Ron , for verifying it can be done . Bob

 

[Petrena Engine Builders]

If you buy a crankshaft,New or used you should take the shaft to a Machine shop and have it check for size,cracks,and straightness.You other crank can be welded ,or check salvage yards in South Georga (pavo)they have a huge inventory. The block also need to have the Linebore check if it is stright. I have been a Machinist for twenty Eight years,serviced and repaired many engines. God Bless.

Don

 

[clemsonfor]

nice first post! you found a 3 year old post to reply to on your first one!!

Just kidding with you, welcome to the board.

 

[Domush]

Haha! I think that is classified as necrothreadia. Luckily it isn't contagious