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1950 TO-20 Head nut torque tool?

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Bruce(OR)

01-30-2008 20:05:43

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Back for more punishment! Dropped the head on tonite and went to tighten the head nuts. The problem is with the nuts on the short studs near the sparkplug holes. How/What tool fits in there to give proper torque readings?
Thanks in advance!
Bruce(OR)

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Greg in the sticks

02-06-2008 19:38:53

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Re: 1950 TO-20 Head nut torque tool? in reply to Bruce(OR), 01-30-2008 20:05:43

Back some 35 years ago when I turned wrenches for a living. I bought some 3/8 th socket extentions from the Mac tool man. The part that fit in the socket was barrel shaped and allowed the extention to slightly tilt to an angle. When I replaced the head gasket on my to20 I thought, boy I wish I still had those extentions.I don't know if MAC tools still sells the extention or not. But, I think The next time I need one of these extention, I am going to just grind the head , barrel shapped. Just a thought, Greg.

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Bob (Aust)

02-04-2008 13:33:11

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Re: 1950 TO-20 Head nut torque tool? in reply to Bruce(OR), 01-30-2008 20:05:43

TEA20 85 mm Standard Engine:

A workshop manual is your friend! :lol:
Bob in Oz

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Don Hooks*

01-31-2008 11:23:54

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Re: 1950 TO-20 Head nut torque tool? in reply to Bruce(OR), 01-30-2008 20:05:43

And still another, similar, approximation method:

I had an OLD wrench with a 1/2" square hole near the wrench opening and I put my torque wrench at 90 degrees to the handle of the old wrench. This way the moment arm was changed very little if I kept the combination near 90 degrees to each other. For uniformity I did this for all the studs. Seems to have worked Ok. Putting the torque wrench at 90 degrees to a crows foot (if there is room) would probably work also.

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GrampaJack

01-31-2008 08:23:51

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Re: 1950 TO-20 Head nut torque tool? in reply to Bruce(OR), 01-30-2008 20:05:43

Ran into the same problem with the TO20. Here is what I did. First I set the head on without a gasket and tightened one of the top nuts that was easy to get at with a standard socket on the torque wrench to like 65 lbs. Then I put a crow�s foot on the wrench and pulled until it just started to move noting where the needle on the scale was. This gave me a clue as to the difference in pressure required with the crow�s foot as opposed to the regular socket. As I went through the normal sequence I would switch to the crow�s foot for those nuts and make an adjustment for the decrease in pressure required to get the desired torque. Probably not extremely accurate but close enough to satisfy me. Best Regards, Jack

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gshadel

01-31-2008 07:26:55

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Re: 1950 TO-20 Head nut torque tool? in reply to Bruce(OR), 01-30-2008 20:05:43

Bruce, I was not as sophisticated as Jerry. I used a "calibrated pull" on the box wrench. After I would torque one of the easy to reach nuts with a T. wrench, I would place my box wrench on that nut and pull to get a feel for how hard I needed to pull to match that torque, then try to match the same pull effort on the hard to reach nut.
Not scientific, but it worked.

George

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Jerry/MT

01-30-2008 21:54:05

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Re: 1950 TO-20 Head nut torque tool? in reply to Bruce(OR), 01-30-2008 20:05:43

The torque is 70-75 lb-ft for the nuts. I know the problem you are referring to on those short studs. As i recall, I used the appropriate box wench and then used a nut and bolt in to the opposite end of the box wrench and used my torque wrench and a socket on the bolt head to tighten. I had to adjust the value I used on the torque wrench to account for the longer moment arm. Tighten from the center working outward in a circular pattern and tighten in three stages, 50 lb-ft, 65 lb-ft and then 75 lb-ft. After you start it up and run it to operating temp,(using an auxilliary gas tank made out of a plastic pop bottle and some fuel hose) you should check the toque and retorque if necessary.

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Derek Molloy

02-04-2008 12:59:46

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Re: 1950 TO-20 Head nut torque tool? in reply to Jerry/MT, 01-30-2008 21:54:05

Hi just wondering would anyone know the torques for the head and bottom main bearing and con rod caps on a TEA 20 1951.Any help would be gratefully appreciated.

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