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  #1  
Old 04-11-2005, 01:09 PM
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Leaking raw water pump

The other day I noticed my raw water pump was leaking from the back, more than a few drips almost a slow steady stream or a very fast drip.

I think you can buy a new seal. I this a difficult relacement? It is on a 94 PS205 with the Chevy 350 TBI.
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Old 04-12-2005, 12:59 PM
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Anyone?????
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  #3  
Old 04-12-2005, 08:29 PM
chico chico is offline
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footin
I have a spare in my tool box,I can't remember where Ibought it.you have to remove the pump and disassemble it.the seal can be pressed out thru the back.mabey skidim can help with the seal.
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Old 04-13-2005, 11:49 PM
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Johnson Raw Water Pump
It's easy. I did this last week. Best if you have access to a press. Becareful not to damage the brass of housing.
1) Remove the impeller.
2) Secure the drive flange,press the shaft off of the drive flange that bolted to the engine.
3) Press the shaft and bearings out of the pump housing from the impeller side.
4)I pushed the seal out with a screwdriver by hand.
Reassemble in reverse order, pay attention to depth of shaft and bearings in pump housing, and depth of flange on the shaft.
My drive flange only mounted one way on the vibration dampner.

When I got it apart I found that the spring inside the seal lip had broken. No big deal, 3 bucks and I'm down the road.
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  #5  
Old 04-15-2005, 11:59 AM
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Granite_33 Granite_33 is offline
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Johnson 812 pump? Yours may be different, but...........

Mine was leaking the same as yours........throwing a spray of water inside the engine cover. I called DIM and the good folks there sent me the new seal.

I was able to remove the impeller and pull the seal out from the front. Small tools required. My spring was OK, the rubber was starting to disintegrate around the shaft.

My memory is fuzzy but I think that DIM even said to do it this way........I may be wrong......

The new one pressed in from the front ( I used some marine grease to help it in). I had no more leaks from that point forward.

Again, yours may be different, but IMO the Johnson seal is accessible from the front like this for easier replacement.
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  #6  
Old 05-20-2013, 11:25 PM
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Quote:
Originally Posted by Granite_33 View Post
Johnson 812 pump? Yours may be different, but...........

Mine was leaking the same as yours........throwing a spray of water inside the engine cover. I called DIM and the good folks there sent me the new seal.

I was able to remove the impeller and pull the seal out from the front. Small tools required. My spring was OK, the rubber was starting to disintegrate around the shaft.

My memory is fuzzy but I think that DIM even said to do it this way........I may be wrong......

The new one pressed in from the front ( I used some marine grease to help it in). I had no more leaks from that point forward.

Again, yours may be different, but IMO the Johnson seal is accessible from the front like this for easier replacement.
This thread is old so I may not get an answer. But is it easy to get the old gasket out?
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  #7  
Old 05-20-2013, 11:28 PM
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Get a new raw water pump.....that's been the consensus on similar threads.
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Old 05-20-2013, 11:36 PM
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Quote:
Originally Posted by mikeg205 View Post
Get a new raw water pump.....that's been the consensus on similar threads.
Ok but it only leaks at idle. Temp is great at idle or under power.

Thanks for the input
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  #9  
Old 05-21-2013, 12:19 AM
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Quote:
Originally Posted by sp00ky View Post
Ok but it only leaks at idle. Temp is great at idle or under power.

Thanks for the input
It only leaks at idle right now. It will only get worse. Fix it now and you won't lose a precious weekend.
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  #10  
Old 05-21-2013, 06:59 AM
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Good luck.

http://www.mastercraft.com/teamtalk/...highlight=pump
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