I assume what the FSM was stating, is to change it when the engine is cold.
Testing it would destroy or damage it.

There is info on testing it in the engine.

section 18-120

To obtain a favorable operating temperature of engine
oil at a faster rate, a thermostat with an opening
temperature of 110c (formerly 95c) part no.
117-180-00-75 has been installed in oil filter since
December 1979

checking

1. Exchange oil dipstick for flexible heat sensor
part# 116-589-27-00

2. Run engine at increased speed and watch
Telethermometer.

3. At an oil temperature of 110 - + 4c or 95 - + 4c
depending on thermostat installed, a distinctive
increase of oil temperature on oil cooler should be
noticeable (manually).


under installation

6. Tighten valve seat ring by means of
socket 35 - 45 NM.

7. Peen valve seat ring in both recesses on oil filter
housing by means of a cross chisel.



I took one apart a few years ago, and ground down a Socket to have the 2 pins
so I could remove the Seat Ring.

The other deep recess is the by Pass valve.
I used a socket that is used (I believe) to adjust the tie rod ends on some older equipment.
It sort of looks like a large slot screw driver.


Thank You for posting the pictures, I haven`t seen this posted before.

Charlie

sent from my pos computer

__________________
there were three HP ratings on the OM616...

1) Not much power
2) Even less power
3) Not nearly enough power!! 240D w/auto

Anyone that thinks a 240D is slow drives too fast.

80 240D Naturally Exasperated, 4-Spd 388k DD 150mph spedo 3:58 Diff

We are advised to NOT judge ALL Muslims by the actions of a few lunatics, but we are encouraged to judge ALL gun owners by the actions of a few lunatics. Funny how that works