Oil Cooler: Service and Repair

REMOVING/INSTALLING OIL/WATER COOLER HOUSING


1. Place assembled oil/water cooler housing on upper crankcase section.
Insert Special Tool 9215 in guide sleeve for oil pressure relief valve.









2. Now bolt down centered housing to final torque.

3. Mount oil pressure relief valve.


Notes on assembly
A modified oil/water heat exchanger housing has been installed as from Model 87. Part No.: 944 107 149 06. The lower part of the housing's heat-exchanger mounting has been modified. Always use the new housing when overhauling engines in earlier models.




A = Original design
B = New design

Preassembling the heat exchanger

1. Mount the 0-ring-type sealing rings on the oil-feed connector pieces and insert the heat exchanger into the housing with the plastic washer.

2. Lay a straight edge on the contact surface of the housing (without profile-section seal).

3. Make up the gap between the spigot on the heat exchanger and the straight edge with shims (approx. 2). Suitable shims must be fined to provide an assembly dimension of 0 or ± 0.25 mm.





Note: The number of shims required between heat exchanger and crankcase must be redetermined every time repairs are carried out.

4. Position the preassembled housing on the crankcase and tighten the screws lightly. Screw in the lubricated assembly pin 9262/1 by hand, center and tighten the fastening screws (crosswise). If there is any resistance when unscrewing the assembly pin, repeat the assembly procedure.





5. Install the oil pressure-relief valve with a new gasket and lubricated 0-ring. Tightening torque 45 Nm.