1994 BMW 318 Water pump

KZEKE

MEMBER
1994 BMW 318
4 CYL
2WD
AUTOMATIC
117,000 MILES

As I tighten down draw down bolts water pump will not seat. Grease applied to O ring and at 1/4 turn per bolt I have snapped off one bolt hole on new Bosh pump. Even if 3 bolts will not hold the new pump on, which is my next goal. I will not buy a new pump unless I can install this one. There is no place to safely apply leverage and if the bolts do not draw it in without damage then what.

4 Replies

MHPAUTOS

MECHANIC
31,937 POSTS

Hi there,
Thank you for the donation,

I have added the text from our data base on water pump removal and re fitting. I feel that you should fit a new pump as it will be far cheaper to do this now rather than run the risk of it developing a leak because of the damaged incurred while fitting it. Our resident BMW specialist may pick up on this and add his advice as well.

Mark (mhpautos)

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Tuesday, August 19th, 2008 AT 5:46 AM

DOCHAGERTY

MECHANIC
9,601 POSTS

Thank you Mark, your advice is just what I would have given. There must be a reason the pump wont go in, usually they dont have any problem at all. Is there something in the hole that you have not extracted yet like the broken impeller?

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Tuesday, August 19th, 2008 AT 9:00 AM

KZEKE

MEMBER
2 POSTS

Nothing in opening, pump fits great without O ring
Cannot seat with new O ring and only 3 of 4 bolt holes to attach with. I have used the old O ring and seated the pump with no grease. Still yet to try water. Waiting till tonight, baring rain, to add a new thermostat and gasket before seeing if an old ring and 3 bolt system will work at running pressure and vibration---- nothing to lose but time.
Thanks to all but we may never find the chinese O ring problem I think it may be just a hair too big, at least that is the only thing left, the old one is a lot flatter (compressed).

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Tuesday, August 19th, 2008 AT 12:58 PM

DOCHAGERTY