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How many of you have replaced your (N52/2.5/3.0) Water Pump?

Discuss problems you have had or are having with your Z4
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nfbr
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Re: How many of you have replaced your (N52/2.5/3.0) Water P

Post by nfbr » Sun Apr 12, 2015 8:31 pm

I'd naturally assume the pitch of the noise to increase as the revs go up if it was within the belt drive system rather than stop increasing in pitch after a certain point hence why I believe it something electrical.

I will check the procedure for purge mode and give that a whirl! Cheers.

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How many of you have replaced your (N52/2.5/3.0) Water Pump?

Post by PPupNorth » Sat Apr 09, 2016 7:20 am

£528.50 at 46389 miles on my 3.0 Si; my local garage fitted an OEM replacement water pump when a lack of engine temperature led me to query why this might be. The diagnostic code pointed to the pump and the rest is history. The BMW garage supplying the part did 'joke' that this was one of their 'most popular' replacement parts - "bless 'em"...............................!!!

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How many of you have replaced your (N52/2.5/3.0) Water Pump?

Post by Dietcokeman » Tue Apr 19, 2016 7:46 am

Yep I bought a car from this very forum last year for a friend as she loved my car. Car was well cared for and looked after, and had done 82k .........fast forward 2k miles and the pump failed . She took it to and Indy who charged her 650 for a new pump and thermostat . This was a 2.5si . The N52 engine being ally needs a higher flow pump hence the electric addition and additional cost, it's the engines Achilles heel to be honest other than that they are pretty good motors .

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How many of you have replaced your (N52/2.5/3.0) Water Pump?

Post by MACK » Tue Apr 19, 2016 8:21 am

Another old thread resurrected! Did confuse me at first as I remember nbfr has recently done his water pump yet he didn't seem to mention it. :)
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How many of you have replaced your (N52/2.5/3.0) Water Pump?

Post by stuartC » Tue Apr 19, 2016 9:16 am

nfbr wrote:My 3.0Si has recently started with a bit of a whining sound coming from the aux belt / front of the engine which increases in pitch with revs to a certain point, then stays at the same pitch when the revs increase further.
It only tends to make the noise when the car is up to full temperature and the vehicle has done just over 71,000 miles.
Sorry for ressurrecting this even further - but my 3.0si has started with precisely the same noise (78k), can you recall what the issue/fix was pls? Cheers :thumbsup:
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How many of you have replaced your (N52/2.5/3.0) Water Pump?

Post by Smartbear » Tue Apr 19, 2016 11:29 am

Dietcokeman wrote:Yep I bought a car from this very forum last year for a friend as she loved my car. Car was well cared for and looked after, and had done 82k .........fast forward 2k miles and the pump failed . She took it to and Indy who charged her 650 for a new pump and thermostat . This was a 2.5si . The N52 engine being ally needs a higher flow pump hence the electric addition and additional cost, it's the engines Achilles heel to be honest other than that they are pretty good motors .
Hi, the n52 engine is magnesium not ally & that's not the reason for the electric water pump-it's there to reduce emmisions & increase power by reducing parasitic loss.
Rob
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How many of you have replaced your (N52/2.5/3.0) Water Pump?

Post by WLH » Tue Apr 19, 2016 12:39 pm

A number of our local club members with Z4's have had this issue. Seem to happen around 70 to 80 thousand miles. Also belts seem to need to be replaced at about point as well. Cost including labor for the electric pump is around 1,000 to $1,200.
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How many of you have replaced your (N52/2.5/3.0) Water Pump?

Post by bluestreak56 » Tue Apr 19, 2016 1:10 pm

3 litre auto coupe replaced at 47k

Prices were ridiculous so I bought one on ebay and got a local indy to fit it for around £400 all in.
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How many of you have replaced your (N52/2.5/3.0) Water Pump?

Post by nfbr » Tue Apr 19, 2016 1:23 pm

Yes, It was nothing to do with the waterpump at all. It was the poor quality oil filter used.

See the exact pics and details here:
viewtopic.php?f=6&t=72036&start=176

Regards, Al.

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How many of you have replaced your (N52/2.5/3.0) Water Pump?

Post by stuartC » Tue Apr 19, 2016 2:10 pm

nfbr wrote:Yes, It was nothing to do with the waterpump at all. It was the poor quality oil filter used.
See the exact pics and details here:
viewtopic.php?f=6&t=72036&start=176
Regards, Al.
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How many of you have replaced your (N52/2.5/3.0) Water Pump?

Post by Dietcokeman » Tue Apr 19, 2016 2:59 pm

Smartbear wrote:
Dietcokeman wrote:Yep I bought a car from this very forum last year for a friend as she loved my car. Car was well cared for and looked after, and had done 82k .........fast forward 2k miles and the pump failed . She took it to and Indy who charged her 650 for a new pump and thermostat . This was a 2.5si . The N52 engine being ally needs a higher flow pump hence the electric addition and additional cost, it's the engines Achilles heel to be honest other than that they are pretty good motors .
Hi, the n52 engine is magnesium not ally & that's not the reason for the electric water pump-it's there to reduce emmisions & increase power by reducing parasitic loss.
Rob

Yes sorry , blonde moment Rob, it is indeed magnesium, and I will bow to you superior knowledge about the reasons why it needs a pump, as that info came from the Indy that did the job. My car is pre facelift so I'm not that up with the N52 . Thanks for the info though .
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How many of you have replaced your (N52/2.5/3.0) Water Pump?

Post by Mark_A » Wed Apr 20, 2016 12:18 pm

How long should a 3.0 N52 take for the coolant temperature to get up to "normal"?

Mine seems to take a long time, almost like a traditional engined car without a thermostat. Maybe seven or eight miles of steady driving before it is up to temperature and the heater seems weak until then too..

Once up to temperature it seems to maintain it ok, neither over or under heating.

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How many of you have replaced your (N52/2.5/3.0) Water Pump?

Post by Scooba_Steve » Wed Apr 20, 2016 10:02 pm

Water temp comes up within a couple of miles for me. Less than 5 mins.
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How many of you have replaced your (N52/2.5/3.0) Water Pump?

Post by Mr Tidy » Wed Apr 20, 2016 10:40 pm

Mine takes 2/3 miles to get to normal water temperature now it is a bit warmer.

I have a 56 plate 3.0 Coupe, and my water pump failed in January. Temperature gauge just shot into the red with the warning light on.
By the way the general consensus is to stop as soon as possible if this happens to avoid any resultant damage.

So mine only lasted 9 years and 62K miles. OEM pump cost £500, thermostat another £100 so by the time my local Independent specialist had fitted it and refilled the cooling system the bill was pushing £800! Ouch! Still I suppose if this one lasts 9 year as well that isn't so bad!

Out of curiosity I looked on the ECP website the other day and they quote £340 for the pump, so not loads cheaper.

Shame it is so expensive as the N52 engine is otherwise so wonderful!
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How many of you have replaced your (N52/2.5/3.0) Water Pump?

Post by Mark_A » Thu Apr 21, 2016 10:30 am

Thanks.

Monitored it a bit more closely today using a Scangauge II.

Starting from about 5°C and driving at a steady 50mph most of the time.

1 mile 42°C
2 miles 53°C
3 miles 59°C
4 miles 64°C
5 miles 69°C (and temp gauge just about reading "normal" by this point)
6 miles 74°C
7 miles 77°C (heater just starting to put some properly warm air out)
8 miles 81°C
9 miles 83°C
10 miles 84°C
11 miles 89°C
12 miles 91°C
13 miles 92°C
14 miles 93°C

Next ten miles it didn't really change from 93°C, bit of motorway, bit of stop-start.

So it warmed up quite well for the first mile and then pretty slowly from then on. Would I be right in saying the thermostat is rated at 97°C so it should reach at least this temperature and then not drop below it?

Thermostat opening too soon and too much?

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