Category Archives: OM 617

Operation The Viscofan coupling is a maintenance-free, hydraulic coupling which operates independent of temperature as well as infinitely variable. When the engine is started (cold start), the fan will initially run at higher speed until the oil has flown back from the working chamber (75) into the reservoir (74) (approx. 1-3 minutes). The fan coupling… Read More »

Removal 1. Completely drain coolant (20- 010). 2. Remove radiator (20-420). 3. Unscrew fan. 4. Slacken V-belt and remove. Drain plug on cylinder crankcase 5. On engine 61 7, remove pulley and vibration damper. 6. Disconnect heating water return hose on water pump housing. 7. Disconnect hose between thermostat and water pump housing. 8. Unscrew… Read More »

Disassembly 1. Press-off impeller. For this purpose, place pressing off disc between impeller and bearing housing. 2. Apply light hammer blows at several points between bearing housing and sliding ring seal to cancel the pre-load and force sliding ring seal out. 3. Force counter-ring out of impeller. Assembly 4. Slightly coat mounting bore of sliding… Read More »

Note On engine 617.91 2, from engine end No. 046716 to 061708 with manual transmission and from 043754 to 058448 with automatic transmission, the water pump of engines 615, 616 with the smaller bearing dia of 36 mm (D) has been installed. The water pump of engine 617.912 has a bearing diameter of 40 mm.… Read More »

Removal 1. Completely drain coolant (20-010) 2. Unscrew fan. 3. Slacken V-belt of alternator and remove. Drain plug on cylinder crankcase 4. On vehicles with automatic climate control, remove York refrigerant compressor with carrier and connected lines and put aside. For this purpose, on engine 617 in model 123.1, remove adaptor between air filter and… Read More »

A. Model 1 15.1 and 123.1 ( 1st version up to February 1979) Removal 1. Drain coolant. 2. Disconnect hose on thermostat housing cover. 3. Unscrew thermostat housing cover. 4. Remove thermostat with seal out of cover. Installation 5. When a riew thermostat is installed, place a new gasket on tnermostat housing. 6. Position thermostat… Read More »

A. De-oiling 1. Completely drain cooling system. 2. Remove thermostat element and set heater lever to warm. 3. Fill cooling system with a 5 % solution of water and P 3 Standard (made by Henkel) (50 g P3/1 I water water). Attention ! On vehicles with alluminium radiator, a neutral cleaner such as P3 Croni… Read More »

Self made tool for vehicles with automatic climate control Note A thermostat housing with automatic vent is installed on model 123.1 starting February 1979 (2nd version). When filling up on vehicles with automatic climate control, proceed as described in section  “B”. Draining 1. Open radiator cap in steps (only below 90c ) . 2. Unscrew… Read More »

A. Model 115.1 and 123.1 (version up t o February 1979) The thermostat layout on model 123.1 ( 1 s t version) differs. On vehicles without air conditioning system, the thermostat housing with thermostat i s located horizontally and on vehicles with air, conditioning system vertically for reasons of space. Layout on vehicles without air… Read More »