Engine Block Heater - Install Procedure

REF. NO. MBNA 20/19

TO: ALL MERCEDES-BENZ PASSENGER CAR DEALERS

DATE: February 1997

SUBJECT:
MODEL 170.447 (ENGINE 111.973) SUBSEQUENT INSTALLATION OF ENGINE BLOCK HEATER

An engine block heater is now available for the above-listed model. The attached Work Instructions no. 364 describes the installation of the block heater.

Note:
Customers should be advised that installation of a block heater in this model is at the customers expense.

Group: 20

Number: 364

Date: February 1997

Work instructions

SUBJECT:
MODEL 170.447 (ENGINE 111.973)

subsequent installation of engine block heater

Procedure

1. Remove lower engine panel.

Figure 1:

2. Drain engine coolant by first attaching a 14 mm inner diameter, 1500 mm long hose (arrow, Figure 1) to the drain plug (1) in the engine block and then loosening the plug. Drain coolant into a suitable container for reuse later.

Figure 2:

3. Remove core plug (arrow, Figure 2 [on left side of crankcase]) with a 22 mm 5-point swivel socket from underhood (vehicle lowered).

4. Install block heater using rubber O-ring from the installation kit and not the alloy washer supplied. Tighten block heater with a 46 mm socket

Tightening torque: 70 Nm

5. Attach electrical cable to block heater.

6. Route cable (3, Figure 2) up to the heater hose (1) and secure cable to heater hose (1) using cable ties (2); from heater hose, route cable along A/C high pressure line to front of vehicle using cable ties as needed.

7. Route cable plug to a convenient location as per customer preference. Secure cable and plug with cable ties.

Note:
Ensure that cable is routed away from moving engine parts and sources of high heat.

8. Close coolant drain plug.

Tightening torque: 30 Nm

9. Reinstall lower engine panel.

Figure 4:

10. Test coolant for sufficient antifreeze protection, refill and bleed cooling system. Pressure test system for leaks (Figure 4).

11. Run engine. Check for proper coolant level (arrow, Figure 4).

Parts Information

Qty. Part Name Part Number

1 Block heater kit 606 200 00 96

As needed Cable tie Local purchase

12. Suggested Time Allowance Information

Note:
The subsequent installation of a block heater in the model listed below is at the customer's expense.

Operation: Block heater, subsequent installation

Operation Number Time Model Indicator(s)

20-5480 1.0 G1