Metal impeller pumps are typically heavier and may have bearing problems that lead to premature leaks. Do not use any sealants on the water pump or the thermostat. It looks like your electric water pump is throwing out error code, you may need to replace your electric water pump. Use a screw driver or something similar to keep the tensioner pre-tensioned while you install the belts. The possibility exists that the same premature bearing failure can happen on the E46 M3 metal impeller pumps as well. The water pump will now become loose. The T45 bits I bought is mostly hopeless here due to the narrow access.
I read the one on Pelican Parts, but I'm not certain if it relates to the 318i or just the 6 cylinder engines. The motor in my car is a 3. Loosen the water pump pulley bolts prior to removing the alternator belt but don't take them out all the way. Next open your bonnet, if your car is hot you will have to wait for it to cool down before you begin. The composite materials solve all of these issues - light weight, strong, long lasting, and relatively inexpensive.
This device circulates coolant between the radiator and the engine, which prevents the engine from overheating. You have to really pull the hoses, don't be scared! The heavier weight also has the drawback of using more horsepower since it requires more effort to move the heavier piece. Remove the radiator drain plug and drain the coolant. Unclip the transmission oil cooler from the expansion tank mounting plate, pull it out. Hi Astro Managed to find it in the end, 7. And if the thermostat has not been changed then this is the best time for a new one as well. Note: Hoses of power steering pump remain connected.
Our E90 N46B20 power steering pulley actually do not have the 3 holes to reach for the 2 water pump fastening bolts. This step is important to keep the new pump from possible damage. This picture is just to show you how the belt goes back on the engine. The two bottom torx bolts for the power steering pump are really awkward to release and tighten because of the pipe work. Some sellers list the water pump with the gaskets that are required for the installation process.
Hence the only way is to remove the power steering pulley. Check its condition by starting your car and observe if it would bounce. Photo taken from beneath the power steering pump. Whenever possible we prefer to sell a water pump with a composite impeller, not metal. The composite materials solve all of these issues - light weight, strong, long lasting, and relatively inexpensive. The price was competitive and your expedited delivery charge was surprisingly low.
The aftermarket solution to the plastic issues was to use a metal impeller. I'm no mechanic and this was a first time for me and it wasn't easy the weather didn't help, heavy rain showers every half hour! For preventative maintenance we recommend a replacement around 85,000 miles. Remember to fasten both power steering pump and water pump together before attempting the 4 x T45 power steering pump mount. Replace the pulley if you observe any of these irregularities or else the bearing might eventually suffer and wear out. Install the radiator back in the car.
Be careful during the water pump replacement, though. Refill the system with a coolant mix normally 50:50 or 30:70 depending on how cold it gets where you are, follow antifreeze instructions fire up the engine and bleed using the two bleed screws located near the expansion bottle. The rubber O-ring came with the water pump are not utilized because the rectangle one already available in the new thermostat housing while the round shape O-rings are for the old connector which was designed differently. Alternate part numbers: 11517838118, 11517838159. Do not over torque the thermostat bolts.
Luckily they are not extremely tight compared to the above. When this happens, the engine will begin to overheat. The possibility exists that the same premature bearing failure can happen on the E46 M3 metal impeller pumps as well. Power steering pump remains in car. I notice you say to only loosen the water hose connector, but then you seem to have pulled if off later on? Align belt pulley of power steering pump to second screw of water pump.