Cummins — 6. Remove the thermostats and seals.

For these Cummins models: GTA38, GTA38, GTA50, GTA50.

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Procedure

1. 8. Check the thermostat for wear or damage, Check for
2. proper operation,
3. 9. The seal must be installed with the part number up.
4. 10. Use a mallet and seal driver Part No. 3375411.
5. Install the seal.
6. Note: Install the seal no more than 0.51 mm [0.020
7. in.] below the top of the cast edge.
8. 11. Install the thermostat by pushing on the outer rim.
9. Note: If the engine being service d is a GTA50, be
10. sure that the correct thermostat is installed.
11. The K50 thermostats contain a nitrile rubber seat
12. vulcanized to the brass collar at the barrel seat. This
13. seat prevents coolant leakage and wear. The ther-
14. mostat with the rubber seat must be on GTA5
15. 0
16. engines. The thermostat with the rubber seat is not
17. required for the GTA38 engine, but can be installed.
18. 12. install a new gasket. Install the thermostat housing
19. and cap-screws.
20. 13, Tighten the cap-screws to 45 Nem [35 ft-lb].

Source: manual:Cummins Gas GTA38-50 Manual 1999 (2).pdf. Figures and steps are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.