water pump help PLEASE

Volume two:
Page: ENGINE COOLING 6B-23

"For H25 engine
1) Install new O-rings (3) to water pump (1).
2) Install water pump to cylinder block.
Tightening Torque
Water pump bolt (H25 engine) (a): 27 N.m (2.7 kg-m, 19.5 lb-ft)
3) Install timing chain cover. Refer to Section 6A2.
4) Install oil pan, front differential housing, P/S system, cooling
system, intake manifold with throttle body and other parts.
5) Refill cooling system with coolant, front differential with gear oil,
P/S system with specified fluid and engine with engine oil.
6) Check wheel alignment referring to Section 3A.
7) Verify that there is no fuel leakage, water leakage and oil leakage
at each connection.
8) Connect negative (–) cable at battery."

The manual has accompanying diagrams as well.

mtnbowhunter said:

i can not fathom the reason of putting sealant on the orings

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mtnbowhunter said:

no gasket between it and the engine block, is that normal?

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I believe you are correct on both counts.

There is no call for O-ring sealant in the factroy service manual.


I don't recall a gasket on the tensioner when I changed the water pump on my V6 either.

SuzuGus said:

Pulling my motor to fix leaking oil pans

Click to expand...

If you have the engine out and you are removing the upper and lower oil pans, remove the lower crankcase and replace this O-ring. If it's not leaking now it will.

rallison203 said:

The new water pump should have new o rings

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The upper two O-rings came with the water pump. The lower two came with the Fel-Pro (CS26386) gasket set for the oil pans.



The parts description for the Fel-Pro set is somewhat misleading.


The "3 oil cooler O-rings" are really two for the oil pick-up pipe and one for the lower crankcase.
The two large O-rings are inner and outer water pump O-rings.
One of the metal washers fits the drain plug. I don't know what the other washer is for. They are different sizes.

HI GANG
thanks for all the great info
i was extemely carefull and somewhat reluctant to do this job as we are wintering in our rv down in baja mexico and if i wrecked or needed anything i could have been a problem
i pulled the front cover off without removing the intake or valve covers, just did it as shown in those 5 utube videos
it is a pita job, that pass side rear inside valve cover nut is a b---- to get off, had i of had access to a welder i would have welded up 1/4 in extension to a cut off 6pt box end, but having said that the valve covers must have been removed before and the little 10mm nuts were very tight, i had to use a very sharp chisel and cut that nut off, got real lucky on that as the nuts a very soft. i did this part first before taking out the rad,etc as i anticipated issues as he made it look way to easy in those videos, and if i could not get those nuts off i was just going to leave it until i had a welder available. as it was i had to cut up and bend 2 different styles of 10mm box ends
the clue to it being apart before was the sealant put on the water pump orings, i do not know what they were doing in there, maybe they had changed the pump, tensioner or??
the tensioner looked to be in perfect shape, no play and the ratchet and teeth were in great shape.
i had bought an ITM tensioner, maybe stay away from that brand as the little metal ratchet on it can not be pressed down to push the tensioner back in, i found this out the hard way when the little plastic retaining pin popped out when i was installing the tensioner, big problem, had to take the ratchet out of the new one, push the tensioner back in and reasemble. and that is tricky.
one thing i should mention is i made a wire gauge so i could set the new tensioner in with the tensioner protruding the same as the old one, and BE SURE not to turn the engine backwards and put slack in the cam chain after intalling that tensioner or it will extend to far and the chain will be way to tight!!
BUT the oil pump chain was very loose and i think that was likely where my noise was coming from!!!
quiet now!
all the bolts cam out easily including pwr steering and alt., cover and valve covers cam loose easily iguess because it had been apart before, so far no leaks but will see
i bought it with about 80,ooo miles on it and it now has about 110, 000.
hard to guess why they would have been working on the water pump unless that is not the original engine in the 2000GV, is there anyway to match engine serial numbers(if they exist) to the chassis???
i