Did a thermostat replacement today (a lot of pics) - Page 4 - BMW M5 Forum and M6 Forums
E39 M5 and E52 Z8 Discussion 1998-2003 Advertiser's Forum

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post #31 of 554 Old 7th October 2009, 12:21 AM Thread Starter
timmay77
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Originally Posted by DouglasABaker View Post
I told Chris that there were 6 o-rings, so don't let him give you any trouble about it He said they weren't leaking, so lets just hope it stays that way!!!

d-

Chris told me. I just didn't see it. If it leaks it's my fault and I will change it out, again.....

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post #32 of 554 Old 7th October 2009, 02:10 AM
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Originally Posted by DouglasABaker View Post
Hey Chuck,

It connects to the oil intercooler, not the block. Part #10 with o-rings #11

d-
Ah, of course! Thanks.

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post #33 of 554 Old 7th October 2009, 02:41 AM
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There is a bunch of difference between the thermostats between the M5 and my 540i . Great pictorial....
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post #34 of 554 Old 13th October 2009, 08:27 PM
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Sorry for the stupid question but why not do the water pump as well when you're already there for preventative maintenance (or do ours not fail)?

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post #35 of 554 Old 13th October 2009, 08:45 PM
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Sorry for the stupid question but why not do the water pump as well when you're already there for preventative maintenance (or do ours not fail)?

2 or 3 reasons for me at least...

1. most importantly it wasnt cost effective for me to do it right now.

2. Im under the impression that they arent connected or in the same housing vs. most standard setups (I may get corrected on this one sorry if its wrong)

3. Tim has done enough for me I didnt want to have him worry about that right now anyway.

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post #36 of 554 Old 14th October 2009, 12:07 AM
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Sorry for the stupid question but why not do the water pump as well when you're already there for preventative maintenance (or do ours not fail)?
Because it requires significantly greater dis-assembly to get to it. The t-stat can be changed by disconnecting a couple tubes and removing a couple bolts. Changing the water pump requires a much greater dis-assembly of the front of the engine.

d-
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post #37 of 554 Old 14th October 2009, 01:44 PM
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Do our water pumps fail often or it's not an issue?
The reason I ask is that my friend's just blew up on his e46 M3 and he is worried about engine damage from the possible overheat.

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post #38 of 554 Old 14th October 2009, 02:48 PM
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Do our water pumps fail often or it's not an issue?
The reason I ask is that my friend's just blew up on his e46 M3 and he is worried about engine damage from the possible overheat.
In all the years I've had the E39 M5 (and been on the board here), I can't really recall any water pump failure issues ever being discussed...of any significance anyway. Apparently, the M5 pump design is much more robust than the 540i/E46/E36, etc, where you need to proactively replace by ~60k. That being said, the E39 M5 is now old enough that some people are really getting up there in miles. I wonder if tranck has ever done his water pump?

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Last edited by CSBM5; 14th October 2009 at 02:49 PM.
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post #39 of 554 Old 14th October 2009, 04:02 PM
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Do our water pumps fail often or it's not an issue?
The reason I ask is that my friend's just blew up on his e46 M3 and he is worried about engine damage from the possible overheat.
Use the correct coolant and your pump will be fine. Use the wrong coolant (i.e. not-BMW) and you'll be replacing your pump. The coolant contains special ingredients required to maintain the seals in our engines (I don't recall what, but I'm sure someone will tell us).
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post #40 of 554 Old 26th October 2009, 04:26 PM
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Im under the impression that they arent connected or in the same housing vs. most standard setups (I may get corrected on this one sorry if its wrong)
The thermostat resides in the upper portion of the water pump. However, as others noted, there aren't a lot of posts about water pump failures on this board, so either nobody bothers to report them, or they're not quite the issue they are on other BMWs. Still, when I had my t'stat changed recently (at over 105k miles), I went and did the pump, too. My car is my daily driver and I just didn't want to get stuck somewhere with a cooling problem. On tear-down found that the pulleys/tensioners were well-worn, too. The coolant reservoir looked like it was on its last legs, and so I changed that out. Also changed most if not all of the rubber parts that had to come out at the same time (hoses, belt).

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