N1 Water Pump Replacement

[BezerkR32]

Recently replaced a water pump on a members car and encountered a problem with a nissan genuine N1 water pump.

for those of you who have replaced RB water pumps you will be aware of the single 6mm bolt that is at the top of the pump. This is where the problem arises with this particular pump. the hole for this bolt has been illongated as so the pump can be multi-fitted to different engines, as this bolt hole is in slightly different spots on the RB 20s, 25s, 26s & 30s.

the problem with the wide hole is that it actually protrudes into the water jacket, obviously causing a substantial coolant leak. it is only 1/2mm x 1/2mm gap.

The cure is to hold the pump up as far as you can when mounting it and tighten the water pump bolts in this position. this is enough to close the gap and seal the pump to the block.

its a small simple step follow but will save you having to do the job twice.

[Duncan]

good catch....first time I got caught out by this I had to pull the front off the motor to fix the leak

its genuine nissan design which is not like them at all....normally everything fits properly first time

[Deano 1]

lol i notice about 2 weeks ago, my N1 pump Seeeps a real small amount of coolant out of that bolt once i turn the engine off, its only super mild but i beat its because it wasnt lifted right up when bolted up. Cheers For the heads up mate