IH3444
Veteran Member
- Joined
- Jan 10, 2004
- Messages
- 2,115
Head should also be checked for warpage, and do some internet searching for a possible Yanmar head gasket set for the upper end. Might as well grind the valves while it is off. 
John Deere 850 head gasket
- Thread starter mobilus
- Start date
- Views: 26996
-
- Tags
- john deere 850
I found a crack in the head, running between the injector port and a valve seat. Guess I need to start looking for a head. Anyone got an extra one lying around? I'll call the owner tomorrow and see how she wants to proceed. Thanks for your help to date. You're all invaluable sources of information!
Mobilus
Mobilus
RobJ
Elite Member
mlauk said:
Part 1 is ok, part 2 i would not do. re-torque the wheels and such, leave the engine parts alone. No one takes their tractor, truck, etc back to the dealer for a cylinder head bolt check.
One ugly looking head there, good luck on a replacement, got to be used parts out there like there is for Kubota. Search my posts if you like, I changed out the head gasket on my kubota early this year. I think I'm gonna re-ring it this winter.
JMO,
Rob
IH3444
Veteran Member
- Joined
- Jan 10, 2004
- Messages
- 2,115
Cylinder heads are repairable, but only by someone whom truely knows what they are doing. The valve seat rings are removed, the head prewarmed, welded, then returned to oven to cool for 24 hours. Then checked for warpage, straightness, and pressure checked. New seat rings installed, checked again. They are repairable, but of course still a bit iffy. You maybe able to find one on the web.
Renze
Elite Member
Is it direct injected or does it have a swirl chamber in the head ?
When i rebuilt the heads of our 5245, the shop guy said that any direct injected head was no problem: an aluminium head was skimmed with a kind of mill with a small chisel, and a cast iron head with a grind stone.
He said, skimming indirect injected diesels was a *****, as automobiles usually have their hardened swirl chambers in a soft aluminium head. this costs about 5 times as much as a cast iron, or pure aluminium head.
grinding the valves in the seat cost me 3 euro per valve: skimming was 10 euro per head (Zetors have individual heads) and the compression test was 50 euro per cylinder.
The head gaskets cost me 10 euro each, between 4 to 6 euro for the valve cover gaskets.
When i rebuilt the heads of our 5245, the shop guy said that any direct injected head was no problem: an aluminium head was skimmed with a kind of mill with a small chisel, and a cast iron head with a grind stone.
He said, skimming indirect injected diesels was a *****, as automobiles usually have their hardened swirl chambers in a soft aluminium head. this costs about 5 times as much as a cast iron, or pure aluminium head.
grinding the valves in the seat cost me 3 euro per valve: skimming was 10 euro per head (Zetors have individual heads) and the compression test was 50 euro per cylinder.
The head gaskets cost me 10 euro each, between 4 to 6 euro for the valve cover gaskets.
All this has been for naught...the lady that I've been working this for choked on the idea of spending a grand on a tractor worth maybe only four times that amount. So I put it all back together, and I will haul it up to a tractor dealer that she deals with. He's going to take it in on trade towards a larger tractor. Not sure what she's going to get.
Everything is a learning experience, and at least I gained some knowledge during this deal. I was looking forward to completing the job though. It's nice to repair something and fire it up afterwards...
Thanks for all your help. No doubt I'll call on your collective knowledge again.
Mark
Moby:
With your talents and demeanor, I'd suggest you go work for that tractor dealer. Maybe even offer to fix that tractor for him as a first job.
I can understand her decision and your efforts may even have been rewarded, but I'd be missing the sense of accomplishment that such projects deliver. Turning broken or maimed machinery into healthy running stuff puts a warm fuzzy in my toolbox. Should have been a doctor....
With your talents and demeanor, I'd suggest you go work for that tractor dealer. Maybe even offer to fix that tractor for him as a first job.
I can understand her decision and your efforts may even have been rewarded, but I'd be missing the sense of accomplishment that such projects deliver. Turning broken or maimed machinery into healthy running stuff puts a warm fuzzy in my toolbox. Should have been a doctor....
