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  #1   IP: 99.50.43.32
Old 11-09-2017, 03:52 PM
tom1340 tom1340 is offline
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water pump diagnosis

I recently put new seal kit into a 502 water pump, then my friend reinstalled it on the Atomic 4 on his Ranger 34. When he started the engine, it ran poorly, minimal water came out exhaust and then engine "thunked" to an abrupt stop in less than 1 minute. He restarted engine, had to increase throttle to keep it running and, in less then 2 minutes, he detected smoke and shut down engine. (he didn't see source of smoke). We are going to boat next week to diagnose. Will pull off water pump and see if there are any obvious failures. If not, I would like to start engine briefly without pump installed to see if problem persists and try to find source of smoke. My question is this. If we start engine without pump in place, is engine oil going to shoot out the open flange connection?
Thanks for any comments.
Tom
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  #2   IP: 24.152.132.65
Old 11-09-2017, 09:21 PM
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Oil won't 'shoot' out because it's not a pressurized area but you could experience splatter.

Honest, I'm not trying to be a wise guy but
  • were the inlet and outlet hoses reconnected to the pump?
  • were they hooked up to the proper ports (I/O)?
  • was the raw water intake thru-hull opened?
  • has the impeller been checked for missing vanes?
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Old 11-09-2017, 09:42 PM
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I have also found sometimes you need to prime the pump..a nice short hose and a bucket right next to the pump..or you pull the hose from the thru-hull and make it vertical and fill it with water to prime the pump and re-connect to the intake before firing it up.

I think the bucket test is easiest, because you can see it sucking water at a good clip if it is working correctly, but I have had to do both (pour water in the hose, and then put it in a bucket.)
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  #4   IP: 99.50.43.32
Old 11-09-2017, 10:37 PM
tom1340 tom1340 is offline
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thanks for comments. My friend who installed the pump is experienced, and claims all connections were proper and thru hull was open. But I wasn't there. Will see when we get back to boat next week. My worry is that even if the pump was improperly installed and would not circulate water, the engine should have run fine for several minutes before overheating. The fact that the engine ran fine before rebuild of water pump, and had immediate problem on reinstallation is a concern. Hope to have answer next week.
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Old 11-09-2017, 11:03 PM
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Perhaps reinstallation knocked something loose? Like a plug wire?

We're guessing here.
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Old 11-15-2017, 12:22 AM
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found the problem. The new seal configuration recommended for our mmi 502 water pump requires a new modified pump shaft. This new shaft is not mentioned in the seal kit instructions we received. So the pump went back in service with the wrong shaft. We are currently waiting receipt of the proper shaft, and hoping that we have not done serious damage.
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Old 11-15-2017, 02:28 PM
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water pump diagnosis

Tom, I sincerely apologize for an oversight on our part! Our general repair kit instructions do not work when replacing seals in our earlier pumps which had the oil seal on the flange end of the pump. We are in the process of updating our general instructions when using them in our "seal replacement only" repair kits (our product number; CSOB_00_573). In the meantime, we are including the following caution note with our seal only kits:

Caution: The instructions packaged with these seals are also used with our complete repair kits which assume that you will be replacing the shaft along with the new seals. If you are reusing your old shaft (regardless of its configuration), ignore the caution note in the beginning of the general instructions and install the new seals in the same place the old ones were installed on your old shaft.

If you have any other questions, Tom, please call us at our tech service line: (717) 766-8777.
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