1971 John Deere 301 Gasoline Head Gasket

[beenthere]

Thinking it is not a wire, but a capillary tube from the sensor to the indicator.
Part # AT67693
$156 part appears.

Note: How the capillary tube works.
Temperature Gauge | How It Works

 

[jcharley]

Lol, well this might be an expensive learning lesson

 

[beenthere]

Maybe a way to convert to an electrical sensor..

 

[jcharley]

Well, I'm not sure what's going on now. Got everything put together and was filling the coolant and it started leaking between the cylinder head and block. I've done maby head gaskets and never had this issue. I did have the head milled. Took the head off and can't see anything obvious. Any suggestions

 

[jd110]

Well, I'm not sure what's going on now. Got everything put together and was filling the coolant and it started leaking between the cylinder head and block. I've done maby head gaskets and never had this issue. I did have the head milled. Took the head off and can't see anything obvious. Any suggestions

Hard to say. If you could post some good pictures of the block surface, head surface and gasket, also maybe picture of gasket laying on block, maybe we could see something.

 

[TimberHole]

My 3 cylinder Yanmar had contaminated water when I bought it. The previous owner had already done the head gasket and it didn't fix the problem. Among other things I had the head done and installed a new gasket. As a precaution I set the head on the block without the gasket to verify my mating surfaces were within a couple of thousandths. I then double nutted the studs and found two loose. I believe the reason the gasket didn't take when done by the previous owner is that the hold down studs had issues. Is your head held on by bolts or studs? Any chance they are stretched or loose? Are washers involved? Are they the correct thickness so the bolt/stud isn't shanking out? Are you sure you have the correct torque? Just some ideas for you.

 

[jcharley]

Jd110 I already reassembled before seeing your post.
Timber, they are all bolts and don't appear stretched.

I was reading through my manual again last night and i missed the part that said to dip the cap screws in oil before installing. I noticed the head gasket didn't seem very crushed, I also noticed that the corner hole of the gasket that sits on 1 of the aligning pins had a small pinch that pushed it up. I cleaned all the surfaces again and then proceeded to reinstall making sure gasket was fully seated on the guide pins and dipped the bolts in oil and retorqued in the proper sequence. I'm assuming a wet torque has a greater actual torque amount than dry. I filled the coolant back up and it doesn't seem to be leaking. I tried to pressure test it but the thermostat gasket was torn when I removed it and was leaking. New gasket should be in tomorrow. I think and hope I have made progress as the coolant was leaking under its own weight before with out even pressure testing it. I'm guessing a combo of not proper torque and that kink in the gasket at the guide pin kept it from sealing properly.
I'll be out of town untill Sunday afternoon so hopefully I cab get her back together and pressure test and start it up then. I will update you either way as to my progress. Again thank you all so much

 

[TimberHole]

I was reading through my manual again last night and i missed the part that said to dip the cap screws in oil before installing. I'm assuming a wet torque has a greater actual torque amount than dry. I filled the coolant back up and it doesn't seem to be leaking.

Torque/Tension fun facts:

The relationship between torque and tension isn't a direct relationship. The amount of torque required to achieve the desired tension varies based upon the lubrication of the threads, the cut of the threads and many other things. In my experience, the torque required to achieve a specific tension can vary by as much as 30% or more due to these variables. I have always been surprised that many maintenance manuals specify a torque but do not address any variables, including the lubrication on the threads.

In the construction industry it is common to use a device that directly measures tension to determine the amount of torque required to achieve that tension. An example of this device is:

Bolt Testers – Skidmore-Wilhelm

Based upon my experience with structural bolts I believe the methods used in much of our maintenance is less than ideal.

 

[jcharley]

I got her all put together yesterday and went through the initial break in cycle. Everything seems to be running smooth. I did find a small leak in my radiator so I have 1 on order but as far as the motor goes all seems well. I installed a manual temp and pull guage on it. Pressure it's right at 53 psi and running right around 190.

Thank you all again for all the help.

 

[Spanner]

:thumbsup:

Could have had the radiator repaired? But hey...

:drink: