Yanmar 3T80J cylinder head torque specs?

   / Yanmar 3T80J cylinder head torque specs? #11  
First 29 ft lbs, 2nd 58 ft lbs, last 72-79ft lbs working from middle toward ends. Rod bolts 16.6 to 20.2 ft lbs. I have basically the same engine as you in my ym2002d. It is a 3t80u-nap. This information came out of a ym220/226 manual which has a 3t75ha engine. Closest to my grey market per Hoye. I have checked out part numbers and know the head bolts are both m12. Part numbers are the same on rod bolts so I have confidence the numbers are correct and would bet a dollar to a donut they are correct for you also. Proceed at your own risk. :D
 
   / Yanmar 3T80J cylinder head torque specs? #12  
Please may I have the Torque specs for rebuilding a Yanmar 3t80-uj on a Deere 750 from 1982.
We are rebuilding it.
Do not deviate. Follow the Yanmar info here in the Deere TM1192 Service Technical Manual.

You must take the torque down in stages. Read the procedure 2 or 3 times to understand what is being mentioned here. Once you got that, then begin.

OK, I'll look for the JD750 data.
 
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   / Yanmar 3T80J cylinder head torque specs? #13  
bmaverick, are you saying he should use the torque listed for the 850/950?
 
   / Yanmar 3T80J cylinder head torque specs? #14  
bmaverick, are you saying he should use the torque listed for the 850/950?
His machine is a John Deere JD850 right. :)

OK, <face-slap> I should not read the forum on a tiny screen. He has a JD750 !

From the
TM1242 Technical Service Manual

1670376663602.png
 
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