Water Pump Leak 300 ISB

[J2Jake]

March this year water pump shaft seal leaking, replaced pump. Rtn trip from Il water pump O ring leaking, replaced O ring, test drive all good. Today Rtn from trip and it appears the O ring again leaking. Seems to be in the area of the lower bolt. Anyone know if this bolt goes into the water jacket? I did not put sealer on threads when I installed new O ring. Motor does not run over 200 temp, Any ideas as to why pump may be leaking? Thanks for reply. Jake Oh yea, 2003 ISB 300.

[mike toon]

I have the same year and motor.
When I put a new water pump on last year ,I did not put sealer or silicone on any bolts.No leaks at all.

[Wild Card]

Pump might have bad casting or you pinched oring installing. Me personally pumps are cheap enough I would put another pump and ring.

[J2Jake]

Well folks turns out the water pump is fine. Turns out the rectangular O rings on the water inlet are leaking. Oh well, here I go again.