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ttubb
09-05-2012, 03:17 PM
I have a slight leak at the juncture of the water pump and the block on my FJ-40. Crazy thing is it only leaks after sitting, not when the engine is warm or running. I have tightened the water pump bolts and it reduced the amount, but it is still there. I am afraid I will have to pull the pump and replace the seal.
Anyone have this problem before? Terry

subzali
09-06-2012, 03:47 PM
maybe the water pump is going bad? I believe there is a weep hole that will leak when the pump is going bad. I'd stay on the safe side and just replace the pump, even if it's fairly new. Bad things happen when water pumps seize.

SteveH
09-06-2012, 03:58 PM
I think I've had every 2F water pump leak ever, including the pump-to-block. I would get an OEM gasket and put a little bit of FIP on each side of the gasket, and reinstall the pump. I suspect the cardboard gasket in there has died of old age.

If the pump shaft has no play and the bearings feel good, the pump itself probably still ok.

Some OEM '78-era FJ40 water pumps have been discontinued -I think you can only get a factory one that has the oil cooler fittings. My '78 does not have an oil cooler (it's not a Calif. model), so I don't know quite what I will do when the water pump dies. Some of the non-OEM pumps struck me as lame in the past - the output hose flange was glued onto the pump body, rather than being part of the casting.

ttubb
09-06-2012, 04:57 PM
It is not leaking from the shaft or weep hole, just the gasket area pump to block. Now that I posted, it has stopped. Go figure.
Thanks for the suggestions. Steve's suggestion was what I was thinking too.
The engine was completely rebuilt about 3000 miles ago, but we did not install a new water pump at the time. I am certain we did install a new gasket. Terry

TIMZTOY
09-06-2012, 09:17 PM
maybe the water pump is going bad? I believe there is a weep hole that will leak when the pump is going bad. I'd stay on the safe side and just replace the pump, even if it's fairly new. Bad things happen when water pumps seize.

what he said..
if its leaking or seaping then its time to replace it. even if its just the gasket. replace the pump because you have to tear it apart anyway

ttubb
09-07-2012, 07:48 AM
what he said..
if its leaking or seaping then its time to replace it. even if its just the gasket. replace the pump because you have to tear it apart anyway

I agree with your reasoning. Thanks, Terry