Yanmar 3T80J cylinder head torque specs?

StxRancher · Jun 23, 2021

I'm replacing the head gasket. Can anyone help me with these torque specs and rockers?

winston1 · Jun 23, 2021

I can tell you what it is on a 3T80U-N. Stages of 29, 58, 72-79 ft lbs. Cylinder head assist bolts 22 ft lbs. Rocker arm support nuts 40 ft lbs.

StxRancher · Jun 23, 2021

Would it be the same?

winston1 · Jun 23, 2021

I believe so but no warranty on my end.

bmaverick · Jun 23, 2021

StxRancher said:
I'm replacing the head gasket. Can anyone help me with these torque specs and rockers?

The 3T80J is found in the John Deere machines. I know, I once had a JD850. I have virtually the SAME engine now in my YM2610, closer if it's a YM2500.

On the Yanmar Tractor Owners Group site, link in my sig next to the flag, there is a TM1192 Service Manual you can get for FREE. It should have those specs you are looking for. Bet it's about the same as Winston listed.

The 3T80 engine comes in a few variants. Just depends on where & what air cleaner is used, if the thermostart is a manual fill or hosed to the diesel tank, early models no cylinder sleeves like the later variants and what exhaust pipe is used. Not much more really.

Don't be shy, we like to hear more about your Yanmar painted JD green. Is yours a JD850, JD750, HC900 or another?

StxRancher · Jun 23, 2021

bmaverick said:
The 3T80J is found in the John Deere machines. I know, I once had a JD850. I have virtually the SAME engine now in my YM2610, closer if it's a YM2500.

On the Yanmar Tractor Owners Group site, link in my sig next to the flag, there is a TM1192 Service Manual you can get for FREE. It should have those specs you are looking for. Bet it's about the same as Winston listed.

The 3T80 engine comes in a few variants. Just depends on where & what air cleaner is used, if the thermostart is a manual fill or hosed to the diesel tank, early models no cylinder sleeves like the later variants and what exhaust pipe is used. Not much more really.

Don't be shy, we like to hear more about your Yanmar painted JD green. Is yours a JD850, JD750, HC900 or another?

I just joined the yanmar tractor owner group, Im trying to find your link. I can click and see your messages, but i dont see a flag or signature

bmaverick · Jun 23, 2021

StxRancher said:
I just joined the yanmar tractor owner group, Im trying to find your link

On the site with FireFox, it's off of the WIKI page lower left column. Then Pick RESOURCES PAGE. Should be in the top of the page. The WIKI is access for community members only.