2002-2005 4.4 V8 M62 Water Pump Replacement.....

This site contains affiliate links for which LandyZone may be compensated if you make a purchase.

Saint.V8

Dyed-in-the-wool 100% RR Junkie
Full Member
So a follow on to my previous thread...

http://www.landyzone.co.uk/lz/f10/preapred-another-how-saint-v8-213912.html

Local Autofactors had the pump on the shelf for £68 odd +VAT, so after dropping the Girlfriend off at work, I went to pick it up.

Also picked up another 5 litres of Coolant concentrate.

Got home, and got started...

First things is to place the bonnet in Service Mode, and remove the Viscous Fan and Shroud...see my Radiator How To for how this is achieved.

http://www.landyzone.co.uk/lz/f71/2002-2005-v8-m62-radiator-replacement-212721.html
Next is to loosen the pulley bolts as this is easier with belt tension to hold the pulley
10.jpg


Loosen the Belt Tensioner locking bolts (2 of them) to relieve the tension on the belt
20.jpg


Slip the belt off
30.jpg


Unclip the pipes to the Alternator and the top of the Water Pump...these have little spring clips on, so lever the clip up and pull the hose off!
40.jpg


Next is to remove the Secondary Air Injection pipe work from in front of the pump, this is a bit of a fiddle as the L/H bank (R/H as facing engine) is hidden under the rocker cover and has to be done by feel....I remove the wrong bolt at first and was about 2” long....this is the wrong bolt, the correct one is slightly above the SAI pipe and only about 3/4” long...remove the P Clip from the front of the pump and the bolts on the R/H and L/H bank.
60.jpg


100.jpg


110.jpg


To get to the L/H Bank bolt, I had to remove this little device...pop the connection off the top, unclip the pipe on the front, and pull the hose off the bottom
70.jpg


80.jpg


Disconnect the Coolant Temp Sensor
120.jpg


Remove all the bolts from the pulley and remove it
130.jpg


Disconnect the pipe to the Thermostat
140.jpg


Undo the 4 bolts to the Thermostat housing and disconnect the wiring plug (red tape is from a wiring repair I carried out)
160.jpg


Remove the Thermostat housing
170.jpg


Remove the lower pipe under the Thermostat housing
180.jpg


Time to unbolt the Pump....Looking at the new pump, identify the 6 mounting bolts. One of them is hidden underneath the pump and behind the Crank Pulley....this is a sod to get at, but with time and patience can be undone with small ratchet spanner movements....took a while and a few expletives later the bolt is out....
195.jpg


200.jpg


As you take the bolts out, note there positions (I used the new pump to hold them as I took them out) as 2 of them are longer than the others.
210.jpg


A bit of a tap and a tug to pull the pump off the two pipes to the rear and the pump is removed....
220.jpg


230.jpg


I left the Coolant Temp Sender on the old pump as I forgot to take it off...I think it is a 22mm AF size....I could only find my 23mm, so I carefully undid it without rounding it off....RAVE indicates to replace the sealing washer.
240.jpg


Clean up the mating face of old gasket
250.jpg


Time to prep the new Pump....

Gaskets are notorious for not staying in position during fitment, so I used some Gastite Sealant compound smeared onto the gasket face to hold the new paper gasket in place.....

Also grease the O Rings on the reverse of the pump and the ends of the two metal pipes to ease refitment.
260.jpg


270.jpg


Fitting the new pump is a bit of a fiddle to ensure the gasket remains in place, position the two metal pipes in place and ensure the pump lines up on two small pegs on the block....with a firm push to seat the metal pipes, place the two long bolts in and then the remaining 4 bolts...I always like to nip up first, then tighten in a Cross ways fashion (similar to wheel bolts) to ensure the unit is bolted up squarely undistorted....
280.jpg


290.jpg


Replace the little pipe under the Thermostat housing....
300.jpg


Bolt on the Thermostat housing....
310.jpg


Replace the SAI pipe work ensuring you have it fitted firmly and squarely back into the cylinder heads....
320.jpg


Replace the pipe and wiring plug to the Thermostat housing....
330.jpg


Replace the little gizmo on the L/H Bank (R/H as facing engine) that was removed to access the SAI bolt....
340.jpg


Replace the Coolant Sensor and Wiring Plug....
350.jpg


Replace the Water Pump Pulley...nip the bolts up for now....again using a cross-ways pattern and ensure the pulley is sitting squarely with no run-out or wobble.....
360.jpg


Rethread the Belt over the pulleys....now using a 17mm spanner on the tensioner arm, pull the tensioner anti-clockwise to compress the hydraulic ram and put tension into the belt....while holding this tension, do up the 2 locking bolts....with tension on the belt, do up the 4 pulley bolts
370.jpg


Refit the pipes to the Alternator and the top of the pump....
380.jpg


Refit the fan and shroud again follow the info in my Radiator Thread....
390.jpg


Refit the Intake Ducting and remember to attach all the pipes back to the shroud and to the ducting...
410.jpg


Put the acoustic cover back on.......
420.jpg


Now comes time to fill the coolant system....

I removed the top hose from the Rad and used a funnel and hose to fill the Rad up to over flowing....

I then used the funnel and poured coolant down the top hose into the Alternator and pump, block and anywhere else it finds its way too...this took about 4.5 litres to fill to over flowing....

Replace the top hose....

Fill the expansion tank and burp the top hose to pump the coolant from the tank through the top hose....keep topping up the expansion tank....

Start the engine and open the bleed screw on the Tank....keep the engine running, burping the hoses, topping up the tank, burping, until you get a solid stream of coolant from the bleed screw....tighten this and keep the engine running up to temp, burping hoses, topping up tank and opening the bleed screw a few times until you are satisfied you have burped all the air out, and the engine is up to a good temp to allow the stat to open.......

Fit Tank cap and clean up, switch engine off....wait to cool and check coolant level when cold!!

Job Done....

I started at 11.15am and was finished, washed and in the Car to pick up the Girlfriend by 5.10pm

430.jpg
 
Last edited:
Thanks Saint.V8 for the detailed instructions. Followed them to the dot!

I have one observation, based on my failure to position the pump gasket correctly. Luckily I notice it before tightening the bolts, but the damage to the gasket was done. The BMW dealerships is very close to my house, so I was able to get the original gasket. What a difference in quality. It's very straight to begin with, so this time I cleaned all the silicone applied and the Permatex gasket shellac that I applied between the pump and the gasket.

Since there are two locator dowell pins for the pump in the block, I positioned the new gasket there without any shellac. It stays there. I was able then to fit the pump over the 2 pipes and then over the dowell pins, always checking the gasket on the sides. Since it's dry, I doesn't attach or smear under the presence of the silicone compound, and allows the positioning movement very easy.

So as others in other forums have suggested, use the original gasket when possible. Pay attention to the dowell pins, since they can come attached to the old pump. Happened to me with one, and it was a bear to get it out. Finally cut open the pump casing over to free the pin.
 
Last edited:
Back
Top