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  #1   IP: 76.24.8.25
Old 04-28-2016, 07:22 AM
newenglander newenglander is offline
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Water pump gasket?

Should the water pump have a gasket? Mine doesn't have one and was doing great, but after replacing an impeller the pump leaks.
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  #2   IP: 70.192.15.182
Old 04-28-2016, 07:59 AM
tac tac is offline
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Between pump body and engine:
http://www.moyermarine.com/cgi-bin/s...=CSOB_06.1_156

Between pump body and pump cover:
http://www.moyermarine.com/cgi-bin/s...ey=CSOB_06_192

And this one (depends on your pump):
http://www.moyermarine.com/cgi-bin/s...key=CSOB_06_67

Which one you need depends on the pump

Last edited by tac; 04-28-2016 at 08:06 AM.
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  #3   IP: 70.192.15.182
Old 04-28-2016, 08:59 AM
tac tac is offline
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For pump parts (with pictures, suitable fo' framin') see the Moyer catalog
http://www.moyermarine.com/cgi-bin/s...rebuilder.html

I assume you're talking about the flange mounted Oberdorfer pump on the back of the engine. If so, then:

Better yet, replace the cover with this, it's easier to handle, and the o-ring makes a better seal:
http://www.moyermarine.com/cgi-bin/s...ey=CSOB_10_370

And that pesky mounting bolt that's difficult to reach is a snap when replaced with this:
http://www.moyermarine.com/cgi-bin/s...key=CSOB_03_64
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  #4   IP: 161.213.49.150
Old 04-28-2016, 11:02 AM
JOHN COOKSON JOHN COOKSON is offline
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newenglander
Welcome to the forum. We hope to hear a lot from you. Stick around this forum and you will learn tons about your engine, boat, and some about life itself.
I've heard a rumor you can fabricate a water pump end plate gasket from a $1 bill if in a pinch. Speaking for myself it is easier just to buy a gasket than spending the time and effort fooling around making one. When you order a gasket be sure to order a couple of extra ones.
I coat my water pump end plate gaskets with a thin coat of TFP paste on both sides to help the seal.
If you still can't get a seal there may be a small bit of crud in one of the threaded part which is keeping the screw from tightening down. It happened to me once. You can try a couple of washers under the screw or chase the thread if this happens.

TRUE GRIT
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Old 04-28-2016, 07:24 PM
newenglander newenglander is offline
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Talking

The crud probably acted as a gasket before
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  #6   IP: 165.225.38.121
Old 03-15-2020, 11:09 PM
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So just for the people who like me... who doubt everything this is my understanding:

- When I removed my pump, the outer seal = the 1st one you see = the 2nd one you install when you change them = the one on the oil side, was metal side away from the impeller = metal side toward the engine block
- several videos I found on line had also the metal side of the outer seal AWAY from the impeller
- Moyer Marine manual (and this thread) are very clear that it should be reverse for the outer seal! so the flat side of the seal toward the impeller! (so the lip of the seals should be toward the fluid sides (inner seal toward the water, so "metal" away from the impeller, and outer seal toward the oil, so metal side toward the impeller)

The picture below is "after" (at disassembly this outer seal was the other way).

Did I install the outer seal reverse???
Attached Images
  
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Last edited by Surcouf; 03-16-2020 at 02:16 PM.
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Old 03-16-2020, 06:27 PM
JOHN COOKSON JOHN COOKSON is offline
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HOH Pump Shaft Seals

Over the years the morphology of the shaft seals for the Oberdorfer HOH pump has changed. If online videos are confusing or in apparent conflict with what the MMI manual says about the shaft seals I suggest you call Ken @ MMI to find the correct way.

ex TRUE GRIT

Last edited by JOHN COOKSON; 03-16-2020 at 07:38 PM.
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  #8   IP: 134.134.139.74
Old 03-16-2020, 08:55 PM
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Weird timing, i just pulled apart two M202-7 pumps about two hours ago. Both had the metal side of the seal towards the engine block. I assumed that was to provide the rubber flange sealing surface toward the water pressure side. Spec says it can provide 26PSI max pressure.

On the other (oil) side its effectively splash/drip lubricated at the acc drive, no real oil pressure. So IMO the rubber flange should be toward the higher pressure side.
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Last edited by ronstory; 03-16-2020 at 08:56 PM. Reason: typos
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  #9   IP: 108.34.135.205
Old 03-16-2020, 09:06 PM
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Quote:
Originally Posted by ronstory View Post
Weird timing, i just pulled apart two M202-7 pumps about two hours ago. Both had the metal side of the seal towards the engine block. I assumed that was to provide the rubber flange sealing surface toward the water pressure side. Spec says it can provide 26PSI max pressure.

On the other (oil) side its effectively splash/drip lubricated at the acc drive, no real oil pressure. So IMO the rubber flange should be toward the higher pressure side.
Thank you!
This is where the logic is complicated: between those 2 seals, there should be no pressure at all, there is a (large) weeping hole should the first seal fail, so that water would not get into the oil. So the direction of the 2nd seal is the answer to the question of: what is more likely to happen: water passing through a failed 1st seal getting through the 2nd seal? Or the chance of oil dripping-splashing on the gear making its way out??

I have a call to Ken tomorrow morning for that!
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Old 03-16-2020, 11:28 PM
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Absolutely, there is a weep port between the two seals.

Since there is no real pressure, I wonder if more of an ease of install? It makes it easy to set the seals with the metal side toward the press (or socket/hammer ).

That's a no/low chance of damaging the seal, and the potential for a bit more shaft lube. ;^)
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  #11   IP: 104.129.196.74
Old 03-17-2020, 09:56 AM
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So Ken confirms that the lip side should be on the oil side for the outer seal, as explained in the MM manual. I guess most people have been doing it the other way over the years with not too much trouble, due to the very low pressure of the oil splashes...

So I will leave my pump as on the picture, making the seal as flush as possible with the flange.

Thank you all for your answers
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  #12   IP: 134.134.139.74
Old 03-17-2020, 11:10 AM
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Interesting. All the pics from the Gardner-Denver site shows the N202M-03 and 07 with the metal side of the seal out on the flange side.

It probably doesn't really matter, the seal is really just more a squeegee than a pressure seal on the engine block side.
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  #13   IP: 134.134.139.74
Old 03-17-2020, 11:15 AM
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Oh, and thanks for reporting back with the answer. The number of times I been researching old threads for wisdom and only to get the end and find no conclusion.

It's just like finding out you missing the last few pages of a good book.
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Last edited by ronstory; 03-17-2020 at 09:27 PM. Reason: typos, always typos
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