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Author Topic:   New water pump with sporatic operation
ewalsh posted 06-11-2002 09:29 AM ET (US)   Profile for ewalsh   Send Email to ewalsh  
I have a 20' Outrage with a 1988 Mercury 200. I just had the water pump and thermostats replaced and, while trolling, had the overheat siren come on.

I quickly shut the motor down and waited for it to cool. After I started it back up, I noticed that at/near idle speeds, water would only sporadically spurt from the upper discharge nozzle. If I cranked the engine up to 2500 rpm (in gear) the water stream was very strong and steady. The water would stay strong and steady all the way to WOT.

I am assuming that the strong and steady stream of water is the result of the boat moving forward, forcing water into the pump.

What should I do? The mechanic that did the pump is in NJ, and the boat is in MA - so bringing it back to them is not easy.

Is there an easy way to check the pump for clogs/foreign material? Is there a screen upstream of the pump that can be cleaned?

Thank you for any help!


Clark Roberts posted 06-11-2002 10:28 AM ET (US)     Profile for Clark Roberts  Send Email to Clark Roberts     
Ed, pull that lower unit yourself or get a mech to do it if you're not familiar, and check out that pump and housing pronto! Something is wrong and it may be a faulty installation by mech up north. But whatever, don't hesitate, get right on it, etc,,etc,,etc,,, too much at risk... Happy Whalin'... Clark... SCN
ewalsh posted 06-11-2002 10:47 AM ET (US)     Profile for ewalsh  Send Email to ewalsh     
Thank you Clark.

The boat is out of the water and won't be used until it is fixed.

I am pretty handy around motors, but I must admit, I have never pulled a lower unit. Unfortunately, The mechanics around here are backed up for weeks.

Could you give me a couple of ideas on how to start? It looks like the lower unit itself is in to pieces. A section divided near the motor, and a section divided by the cavitation plate. Which of these is seperated to access the pump?

Thank you for any help, Ed

george nagy posted 06-11-2002 01:17 PM ET (US)     Profile for george nagy  Send Email to george nagy     
Buy yourself a clymer manual!
jimh posted 06-11-2002 01:46 PM ET (US)     Profile for jimh  Send Email to jimh     
Replacing the impeller is a good skill to acquire. Taking the lower unit apart and servicing the pump impeller is fairly straight forward.

The hard part comes in re-installing the lower unit. You must simultaneously:

--align the drive shaft
--align the shift shaft
--align the water passages
--align the exhaust passages

all the while holding the lower unit (which on a large engine can weigh a fair amount) and attempting to move it upward into place.

The real catch is that while doing this you must maintain the shift linkage in the proper position so that the F-N-R shift operates correctly.

While clearly this is not impossible, it is fair to say that on your first attempt you may be more prone to error than an experienced shop mechanic who has done this for twenty years.

Clark Roberts posted 06-11-2002 04:21 PM ET (US)     Profile for Clark Roberts  Send Email to Clark Roberts     
Ed, Jim's advice is good. If you decide to tackle it, it would be a good idea to get some help from someone who has done it before. If you need step-by-step advice just e-mail me or call me at 386-767-9730 and I'll talk you through it (or talk your ears off, whichever comes first)... Clark.. SCN
ewalsh posted 06-11-2002 04:48 PM ET (US)     Profile for ewalsh  Send Email to ewalsh     
Jim, Clark, thank you so much.

It sure does sound like a job for a pro. After calling around some more, I was able to find a mechanic who had a canceled appointment. So I dropped the boat off this afternoon.

I'll try to post the results of his inspection when I get them.

Thanks again, Ed

JohnAz posted 06-11-2002 05:00 PM ET (US)     Profile for JohnAz  Send Email to JohnAz     
You realy should look over his shoulder and learn

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