Pajero Owners Club of South Africa

Hi Guys
Once again I am in need of the advice of some our engine fundi's. I am having my 200 000km service done (plus cambelt, etc) and in line with the conventional wisdom on the forum, I am having the waterpump replaced as well. The problem is to get hold of the correct pump. The dealers have at least 3 different pumps for the 6G74 engine in their catalogue, all of which are different to the present one on the engine! We eventually sent them a photograph of the fitted pump but although it looks the same, the pulley size of the one they supplied is 10mm smaller in diameter (60mm as opposed to 70mm) than the present pump.
What to do now? Can we fit this pump? The rev's at which it runs will obviously be higher than the old one; will this matter? Will this cause the engine to run slightly hotter as the water will be circulated quicker? And what side effects might that have? Could there be other side effects we haven't thought of?
Can anybody help pse?

George Snyman
PS: The smaller pulley now also necessitates a smaller (shorter?) cambelt as the tensioner pulley apparently won't be able to take up all the slack.

According to WinCaps the waterpump for the V45W chassis - 3500 LWB

Up to 1997.5 - Part Number MD972440
1997.6 - 2002.3 - Part Number MD973162

Thanks 4ePikanini
I don't know if my chassis is the V45W (How do I find out?) but the first part no. you gave (MD972440) corresponds to a quote for a "waterpump kit" I got from the dealers (and for R1300 I might add); don't know about the other, will check tomorrow.
Do you think I should fit the pump I mentioned?

best way is to take the pump out and spot the part number and then get the same one based on that.

The problem is that they might not have stock, but East London Mitsu have ordered parts for me from Japan and they arrived within a week.

pump is driven by the flat side of belt and is mounted down low in the block.diameter critical .i have a feeling the cam gears and backcovers have to be removed to get waterpump out it has a back housing connected to it and also an o/ringed tube.would recommend doing cam and crank seals. Use engine oil on front pulley bolt thread and washer face.

digger wrote:pump is driven by the flat side of belt and is mounted down low in the block.diameter critical .i have a feeling the cam gears and backcovers have to be removed to get waterpump out it has a back housing connected to it and also an o/ringed tube.would recommend doing cam and crank seals. Use engine oil on front pulley bolt thread and washer face.

This is indeed recommended by Mitsu but my machinist that rebuilt my engine insisted on loctite on the thread because .......

his words

the oil creates an airtight seal that locks air at the back of the thread creating a back pushing pressure against the bolt especially when the engine gets hot and the air expands.

Mine is done with loctite - I have agreed with my machinist that they will loosen it when I need to do my cambelt.