Temp issues?

[rockaukum]

1202B ford straight six 200CI industrial engine with manual transmission.
The temp gauge reads high and the engine is not hot. I purchase a new sending unit for the motor but am having difficulties removing the old sending unit. So I thought I would try to figure out how to test the sending unit while it is in the motor.
Anyone have suggestions on how to do this?
As for removing the old stuck one, I have just tried using a box wrench with the engine cold and no luck.
My thought is first penetrating fluid and let it sit
Next would be to warm up the engine
Next would be to apply heat to the sending unit. Caution needed as I think the unit is brass and this heat could cause more issues?
Any advise on ways to proceed and test or remove the sender would be great!
Thanks in advance,
RA

 

[Bombi1]

Get some Kroil to spray on it. Let soak for a day. Use a 6 point socket.

 

[chowderman]

an aside . . . would it not be simpler / easier to check the gauge first?

the sensor passes x voltage to the gauge, if you can find the specs on how much voltage it requires to make the gauge read low-medium-high . . . .

the the gauge is "proven" to work correctly, then the only issue is how to get the bad sensor out . . .

 

[rockaukum]

Well, I suppose it could be the gauge. From reading around, I came to the conclusion that the sending unit is a common failure. That is why I went this route. I ended up removing the cowl around the back of the motor to gain access to the area. Then I notice this. On the bell housing there is a hole, I'm guessing an inspection hole. There was a piece of plastic kinda in and kinda out of the hole. It appears the prior owner had stuffed a plastic cap, possibly from a grease tube, in the hole. So it has been open to the elements.
Anyone know where I can get the correct plug for the hole?
If you have the specks for testing the gauge, here is a photo of it.
thanks,
RA

 

[rockaukum]

So, I have searched and searched. I have visited three auto parts stores in search of information on the hole in the bell housing. No-one was able to help. I even contacted the local ford dealer, I got nowhere with them either. Said they have no information on the Ford Industrial motors.
Anyway, I figure it is an inspection port but why would someone put an inspection port on top where you would not be able to use it if the motor / transmission was still in a vehicle? Oh well....
I was able to locate some rubber hole plugs online. They fit the hole perfectly and should work just fine.
Now I need to get back to the temp gauge issue.
ra

 

[PJL]

Maybe for ignition timing marks?

 

[rockaukum]

Well, problem solved, finally!
After many visits and conversations with several auto part houses, purchasing new a gauge, new thermostat and running a separate wire, I got it solved! I may be wrong, but as it turns out, the sending unit IS matched to the gauge! Multiple folks at the part houses and on-line say no, it won't matter! Once I got the matted sending unit to the gauge installed, I fired up the cat and watched and waited. The needle stayed, then moved up slightly and the engine ran. I have yet to go out but hoping next week after this big CA dump that is currently going on.
Anyway, a sigh of relief that another gremlin has been solved.
ra

 

[J5 Bombardier]

Always a matched set as far as I've seen ,especially with all the off shore stuff out there today. If the dash to T housing is close I like to use a mechanical temp gauge myself.
Top hole in bell , possibly access to grease throw out bearing on some applications.
J5 Bombardier

 

[rockaukum]

J5,
Yeah, I learned the long way. Took some time, but finally got there! I believe in following up when I can. I think it may, can, will help someone else down the road.
ra