Author Topic: M42 Water Pump replacement options (Read 13635 times)

BlackBMWs · « **on:** July 18, 2009, 09:35:04 AM »

Good Morning! Searched and did not find a specific thread on this, so I'll ask here. Are all replacement water pumps for the M42 created equal? I know there are different quality options for M50 and M62 motors so I'm checking.

I see there's Graf and Laso pumps available. What was OEM for the M42?

Also, are there any things to be mindful for when swapping out the pump or is it fairly straight forward. I swapped all cooling, vaccumn and fuel hoses and thought the pumps are fairly inexpensive and since I'm in there anyway and don't know when this one was last or ever changed, it's cheap insurance... 141+k miles (Broken ODO...) I'm thinking thermostat too...

Thanks! Rich :cool:

BlackBMWs · « **Reply #1 on:** July 18, 2009, 02:15:20 PM »

Went with a Meyle $60. :cool:

ZeeGerman · « **Reply #2 on:** July 18, 2009, 05:46:32 PM »

Make sure you get one with metal impellars. Not plastic! The plastic ones can break.

BlackBMWs · « **Reply #3 on:** July 19, 2009, 01:20:35 AM »

Quote from: ZeeGerman;75458

Make sure you get one with metal impellars. Not plastic! The plastic ones can break.

Agreed. This ones all metal. :cool:

BlackBMWs · « **Reply #4 on:** August 08, 2009, 07:30:11 PM »

Just thought I'd follow up my question with a few pics for folks who might have the same questions.

I was motivated to change the water pump on my new purchase as it showed 141k on the odometer, I had no idea of when it was changed last and I had the intake manifold off doing other work, so it was way easy access to replace the water pump and thermostat.

Cheaper timewise to swap it now preventively than to wonder then this critical part may fail when I lease wanted it to. This way, I hope to have 25-40k miles before I wonder about it again...

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Some folks have asked question on how you pull the pump out.

A view into the chamber the water pump fits into...

The original water pump next to the Meyle replacement. Note the original Laso pump has the plastic impeller.

I'd recommend you change your water pump and thermostat bolts if they look anything like this.

Anyway, it's all pieced back together and cooling like it's supposed to...

Cheers! :cool:

318isam · « **Reply #5 on:** October 18, 2009, 01:41:08 AM »

sweet!:D

RED IS 91 · « **Reply #6 on:** October 18, 2009, 04:34:40 AM »

Should move over to the How To section.
great job

quinn11m20 · « **Reply #7 on:** October 18, 2009, 08:05:24 AM »

Yup. I agree. By the way Bav Auto sells both of those style pumps. At a decent price as well.