70 gas head bolt torque

[random_farmhick]

I need to do some work on a 70 gas, and since I've found there is no manual specific to a 70 gas, I have some questions on torque specs. The IT book says 208 lb-ft for the torque, but I see many people say to use a 720 gas book, and those show 275 lb-ft for the torque? That's a bunch different for the two, even though they use the same size of stud... So which number would you do if it was your tractor? Thanks\

 

[buickanddeere]

I need to do some work on a 70 gas, and since I've found there is no manual specific to a 70 gas, I have some questions on torque specs. The IT book says 208 lb-ft for the torque, but I see many people say to use a 720 gas book, and those show 275 lb-ft for the torque? That's a bunch different for the two, even though they use the same size of stud... So which number would you do if it was your tractor? Thanks\

Best thing to do with the IT manuals is use them to prop doors and windows open or closed. 1-800-522-7448 for a real Deere manual. The 70 both gas and diesel used 208 lb ft . The 720/730 had thicker castings and were speced higher at 275 lb ft.

 

[random_farmhick]

Best thing to do with the IT manuals is use them to prop doors and windows open or closed. 1-800-522-7448 for a real Deere manual. The 70 both gas and diesel used 208 lb ft . The 720/730 had thicker castings and were speced higher at 275 lb ft.

There is NO factory deere service manual for a 70 gas though, so it wouldn’t do any good to call other than waste time on the phone .

 

[used red MN]

There is NO factory deere service manual for a 70 gas though, so it wouldn’t do any good to call other than waste time on the phone .

The JD Publications site appears to say otherwise SM2017 would be one. JD techpubs

 

[random_farmhick]

The JD Publications site appears to say otherwise SM2025 would be one. JD techpubs

I have it, along with pretty much every other two cylinder book. The ONLY thing in that book that is specific to a 70 gas is the pulley brake adjustment. The engine, transmission, hydraulics, pto, is all for the 720… The book shows the head torque of 275 for a 720, and nothing for a 70…

 

[buickanddeere]

Regarding the 70 gas . A 70 diesel manual would provide some specs omitted in the 720 gas manual

 

[used red MN]

I have it, along with pretty much every other two cylinder book. The ONLY thing in that book that is specific to a 70 gas is the pulley brake adjustment. The engine, transmission, hydraulics, pto, is all for the 720… The book shows the head torque of 275 for a 720, and nothing for a 70…

My apologies, I see that is for the 70 diesel! Should have been sleeping instead of posting.

 

[random_farmhick]

My apologies, I see that is for the 70 diesel! Should have been sleeping instead of posting.

Hey, I've done the same thing before unfortunately... Yeah the sm2017 for the 70 diesel is close, but the engine side of it is COMPLETELY different yet...

 

[random_farmhick]

Regarding the 70 gas . A 70 diesel manual would provide some specs omitted in the 720 gas manual

70 diesel is close with everything except the engine though... That's where I need the correct specs, is the engine. The only thing really interchangeable on a gas to diesel is the oil filter when it comes to the engine. Different bearings, different bores, different valves... All different between a diesel and a gas, and again different from a 70 to a 720... I know you don't like the IT books, but where did they get their information for a 70 gas? I doubt they pulled it out of thin air. I know the torque specs I was talking about, I'll probably just go with the 208, but it just doesn't make sense that deere didn't publish engine specs for a 70 gas... I know the all fuel is basically a styled G though, but head and block are different to a gas.

 

[used red MN]

The IT book says 208 lb-ft for the torque

An online spec chart from Steiner shows the 208 ft lbs. Another online chart for earlier models shows the D, G and R all at that 208 number. An online comprehensive engine torque chart by the rebuilder parts supplier Mahle also shows the 208 spec. If you want when I get home this evening I will check the Motor Heavy Diesel repair manual I have from that era which has a farm tractor spec section to see what it says.

 

[buickanddeere]

70 diesel is close with everything except the engine though... That's where I need the correct specs, is the engine. The only thing really interchangeable on a gas to diesel is the oil filter when it comes to the engine. Different bearings, different bores, different valves... All different between a diesel and a gas, and again different from a 70 to a 720... I know you don't like the IT books, but where did they get their information for a 70 gas? I doubt they pulled it out of thin air. I know the torque specs I was talking about, I'll probably just go with the 208, but it just doesn't make sense that deere didn't publish engine specs for a 70 gas... I know the all fuel is basically a styled G though, but head and block are different to a gas.

Head , main ,rod , flywheel torques are identical . Most clearances too .

 

[used red MN]

An online spec chart from Steiner shows the 208 ft lbs. Another online chart for earlier models shows the D, G and R all at that 208 number. An online comprehensive engine torque chart by the rebuilder parts supplier Mahle also shows the 208 spec. If you want when I get home this evening I will check the Motor Heavy Diesel repair manual I have from that era which has a farm tractor spec section to see what it says.

I checked my Motor manual and I didn’t realize that the condensed information there only gives rod and main bearing torques of 85 rods and 150 for the mains no head bolt value given for any of the listed brands. It also has no separate listing for gas and diesel just a note saying that the diesel bore is larger giving the spec of each. It’s a real “Cliff notes” reference.

 

[Pete in MD]

Mr. Thinker's John Deere Almanac, 2nd Edition, shows 208 for the gas model 70 cylinder head.

Also 208 block to case, 80 rods, 150 mains, and 275 flywheel.

 

[Fixingfarmer]

208 should be in the standard torque range for a grade 8 5/8 stud as well up to 220 would be considered normal. Iirc I used 208 on the late G which should be very similar and also has very little for a manual.

Be sure to start with 125 to 150 or so on all of them first

 

[buickanddeere]

The service bulletins probably contain all the info and more . I have been busy this week and have not looked up the data .
iirc Green Magazine has the wealth of info that the Late Great Dwain Larson accumulated.