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Hi all I'm a big mess right now I ordered a genuine Nissan water pump for rb25det I got it installed at a workshop bc too much effort , I've driven it a hand full of times the last almost two months and today I changed spark plugs and re gapped them at 0.9 as they were I went for a drive it felt a lot better until I parked and noticed a river of green coolant .... looked underneath and bam cracked waterpump , what do I do ???

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Put up some pics, it would be good to see where it cracked.

Either the workshop has slapped the new pump on without cleaning the old sealant and then carelessly cranked it tight in a bad sequence or as already suggested they cranked the belt so tight it cracked the housing. Have you checked the belt tension?

Either way go back to the workshop with the pics and ask for an explanation. 

 

 

I've just had a close look at an RB25 water pump, and I don't think that you could crack it through there by over-tightening the bolts. There is plenty of meat under the bolt heads that would have to be crushed first. I'd be inclined to think that it was faulty from new, or had been dropped at some stage.

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