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Did the water pump, now a leak, not rubber seals....

posted by  GustafKalle on  Thu Apr 14 09:02 CST 2005
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last visit: Sun Sep 2 13:57 CST 2007
[RELATED]

Yep, as I said the other day, I did the water pump while in there, doing the oil leak at the oil filter mount. I have done at least 5 water pumps in these 4 cyl engines, and I thought I knew all the tricks....
What I find is coolant below engine, maybe an egg-cup full after each 10 mile drive. I hate to go in there again without being prepared. So give me your best tips.

I have an electric fan, and despite revving engine while fan is not spinning (so I have the chance of seeing any small squirts) I canīt see any leak. There might be a small trickle at the bottom of the pump, but canīt really see because of cam belt cover blocking visual inspection.

I cleaned away old gasket thoroughly. Put in new gasket in the right way. Applied pressure upwards on pump while tightening bolts; there seems to be no leak from the big or the small rubber seal.

Tips, before I go in there again, please!

Thanks in advance

Gustafkalle








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    Did the water pump, now a leak, not rubber seals.... 200 1975

    posted by  someone claiming to be johnwr on  Thu Apr 14 09:29 CST 2005 [RELATED]

    Ahh, an experienced Wasserpumpenman. I am also too familiar with this job as my skills deteriorate with age yet manage to damage the paper gasket or become frustrated with head pitting.

    You need to get some pressure artificially into the system with a bicycle pump or whatever. Great use for an old pressure cap and tyre valve. You'll see the leaker then.








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      Did the water pump, now a leak, not rubber seals.... 200 1975

      posted by  GustafKalle on  Thu Apr 14 14:46 CST 2005
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      last visit: Sun Sep 2 13:57 CST 2007
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      Nah, experience seems to be spread out over too long time. Iīm a rusty Wasserpumpenmann.

      Applying pressure the way you suggest seems a good idea. I have an electric tyre pump, the type you can plug into cig lighter. Will look around for a cap and a valve.

      Please give me an idea of what pressure is maximum advisable to apply. Will cap work as a safety valve and open at 50 psi or so?

      Another thing: leak seems to be less now, 4 days of driving after pump replacement. Can I expect the gasket to swell and stop the leak - I suspect the leak is at the gasket somewhere.

      If I have a rough motor block surface, will it help to put in two gaskets to make the seal thicker, supposedly filling out the pits better, or should I apply some sealant too, and if so what kind?

      Gustafkalle








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        Did the water pump, now a leak, not rubber seals.... 200 1975

        posted by  someone claiming to be johnwr on  Fri Apr 15 01:03 CST 2005 [RELATED]

        Whoa, careful, Wasserpumpenmann. A 240 cap is marked for 75kpa, less than one bar. If you put a hole in a spare one, for a tyre valve, you've pulled out the guts that do the pressure relief job. You should not need to go above the rating before seeing the leak. It is difficult to go searching for the little squirts with all those belts moving and the wind blowing, that is why you might apply artificial pressure. My usual practice is to look for the error I made, perhaps a small wrinkle or tear in the paper gasket while applying pressure against the head's underside. Or if it is dribbling from that donut seal, more tedious sanding of the aluminium it mates with. Those are the ways I have so far avoided using sealants or extra gaskets.








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          Did the water pump, now a leak, not rubber seals.... 200 1975

          posted by  GustafKalle on  Sat Apr 16 00:27 CST 2005
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          last visit: Sun Sep 2 13:57 CST 2007
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          Thanks

          Still some leak, so gasket hasnīt swollen to stop the leak. I still suspect a leak at the bottom of the pump, where I canīt really see unless I get under the car and remove the plastic protective shroud (Watchamacallit) and probably also the cam belt cover. Will try find some time this weekend. If I find something of general interest I will post the experience on Da Board







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