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1972 CAT D4D overheating

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2 months 2 weeks ago #254395 by greenfieldrider

If you go to Cat get screen gasket and O-rings for filter.
You will need 10 us gallons of oil a SAE10W TO-4 spec.
While you're under tractor pull the torque screen,clesn it and see what's in it.
Bob
 

I got the oil out, but where can I find the torque screen? 

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2 months 2 weeks ago #254396 by Old Magnet
Replied by Old Magnet on topic 1972 CAT D4D overheating
Behind the key shaped cover on the back/bottom of the transmission case.
The following user(s) said Thank You: greenfieldrider

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2 months 2 weeks ago - 2 months 2 weeks ago #254400 by bluox
Replied by bluox on topic 1972 CAT D4D overheating
Actually the screen is on the front of the transmission case right below where the drive flange goes into the torque converter and under the filter housing.
If you go to Cat have them price you an L&M guide.
Bob
Last edit: 2 months 2 weeks ago by bluox.
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2 months 2 weeks ago #254413 by trainzkid88
a dirty screen wont help with overheating either. part of the job of the oil is to also carry heat away from the transmission parts too.

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2 months 5 days ago - 2 months 5 days ago #254655 by greenfieldrider
I installed a new water pump today and had the radiator cleaned. I also replaced the transmission filter and changed the milky trans fluid.

After a 15-minute test ride, it looked good, with the temperature gauge in the lower end of the green area. However, 10 minutes later, I noticed that the coolant temperature began to rise. Five minutes after that, it was in the red area again, dang!

Now, the weird thing is that when I started the engine after turning it off to check the coolant level, the coolant temperature rapidly declined. It went from red to normal in around 20 seconds. The engine was only off for maybe 2-3 minutes

Could this be an airlock, or is it a symptom of something completely different?

Should I purge the cooling system, and if yes, how?
Attachments:
Last edit: 2 months 5 days ago by greenfieldrider.

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2 months 5 days ago #254657 by gary in CA
Replied by gary in CA on topic 1972 CAT D4D overheating
Thermostat been checked? 

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2 months 5 days ago #254658 by greenfieldrider
Yes - it’s brand new and I tested it before I installed it.
 

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2 months 5 days ago #254659 by gary in CA
Replied by gary in CA on topic 1972 CAT D4D overheating
Wouldn't hurt to replace the guage too.

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2 months 5 days ago - 2 months 5 days ago #254660 by greenfieldrider
I cross checked it with an infrared thermostat. Unfortunately the gauge is right, the d4d is overheating for whatever reason.

The coolant temperature drop was also real, it dropped from around 220F to around 180F.
 
Last edit: 2 months 5 days ago by greenfieldrider.

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2 months 5 days ago #254662 by gary in CA
Replied by gary in CA on topic 1972 CAT D4D overheating
Take thermostat out and try it.

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