PeachParts Mercedes-Benz Forum - View Single Post - W202 C220 waterpump

tobybul · #12 06-19-2010, 11:57 PM

Ok, replaced water pump this afternoon. Wasn't too bad of a job.

Here's what i did.....

- Got spanner wrench from AZ (part no 27018). see pictures. Use AZ wrench tool to remove fan clutch off water pump pulley. AZ rents them for $25 deposit refundable if returned in 90 days.
- Loosen fan nut using the small 36 mm and 47 mm spanner wrench (see picture on how the large wrench is used). Nut is unscrewed in clockwise direction. Fully uncrew fan nut and lift up and remove.
- After removing fan, remove Fan shroud. After removing fan shroud, you will now notice you have lots of room to work on the pump.
- Remove fan belt (turn tensioner CCW) to remove belt.
- Remove fan pulley by loosening the 4 - 5mm allen-head screws. Use the large spanner wrench to hold the pulley down while loosening each screw. Be careful when turning each allen screw. Allen wrench must be seated securely on the allen screw head when turning (I kinda messed up one of the aallen screw heads. Turned out Home Depot had them (M6 X 12mm) so I replace them all. Also used tension washers rather than flat ones.
- Loosen and remove all 4 screws of pulley and remove pulley. Keep all screws in secure place .
- Removing the pulley exposes the front of the water pump.
- Before removing the water pump, I cleaned the front of the engine by spraying degreaser all over the front of the engine and pressure washed it. After cleaning the engine, using a Sharpie, I marked each water pump bolt so I remember which bolt-hole to return them to. They are different lengths so its important to do this. The pump is hel by 8 hex bolts (2-13mm & 6-10mm).
- I proceeded to loosen and remove all bolts and pulled the pump and gasket out.
- Detached hoses off the pump. You can do this either before or after pulling the pump.
- Reversing the procedure, I installed the new pump.