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Author Topic:   Water Pump for 1975 85 hp Johnson
jxs226 posted 05-23-2002 07:41 PM ET (US)   Profile for jxs226   Send Email to jxs226  
Folks -

I'm paranoid about the function of the water pump on my 1975 85 hp Johnson. I've witnessed weak streams from the exit holes and recently after a run in a brackish and very turbid river and bay, some of these exit holes were blocked when I flushed the engine back home. If I pressed the earmuffs over the intakes tightly, I eventually could force some water out the blocked holes. But the water was damn hot (maybe b/c of the fact that I had just run the engine for 30 mins?). Also, there was some debris that came out of the blocked holes when they finally began to drip water again.

So I'm wondering which scenario is true:

1) I ran the engine dangerously close to overheating due to poor water pump performance and some debris accumulation.

2) The water pump is working properly and it was simply an issue of debris clogging the exit ports. The temperature of the exiting water, while not nearly ideal, was normal considering the clogging and the amount of time the engine ran.

Being paranoid, I have ordered a new water pump, part number 0439140, previously part number 386124. Does anyone have the breadth and depth of outboard knowledge to say whether this is indeed the correct or incorrect part number for a 1975 85 hp Johnson?

I was told OMC ceased manufacture of the chrome plated water pump kit for this engine in 1981. Any truth to this?

Down the road I plan to try to install this new pump myself - a task that will demand lots of questions and research. That'll be another lengthy post, I guess.

Long post, lots of questions. Thank you for reading through it and I'd love any suggestions/comments.


Cpt Quint posted 05-24-2002 09:23 AM ET (US)     Profile for Cpt Quint  Send Email to Cpt Quint     
The older OMC pumps last forever. They either pump or they dont from what I understand. The stream is not like those with the smaller hps and wider stream ports.
You may be perinoid but it wont hurt to change it out. As long as you have a stream its functioning properly. There may be, however, some junk clogged in the line slowing the stream but this shouldnt really effect the cooling ability. None-the-less, its nothing you want to blow off so certainly get a mechanincs opinion as well.
whalerron posted 05-24-2002 09:34 AM ET (US)     Profile for whalerron  Send Email to whalerron     
Alot of this may depend on the exit holes you are talking about. Steve Leone could confirm this but if you are talking about the holes in the rear of the motor just below the cowling, I think water only comes out of them when the thermostat opens. You will have a very hard time getting water to come out of those holes until the engine is warmed up and one the thermostat opens, that water should be at around 180 degrees. When the thermostat is closed, most water exits through the prop.

- ron

jxs226 posted 05-24-2002 10:39 AM ET (US)     Profile for jxs226  Send Email to jxs226     
Thanks guys for your comments. I feel a lot better about things now and think I'll be able to take my girlfriend out for a little fishing this weekend for the first time since I bought this boat nearly two years ago. Ron, what you describe makes perfect sense and if the water is normally ~180 degrees F out of those lower holes, then I feel a lot better, b/c it certainly was damn hot. Thanks again.


Ed Z posted 05-27-2002 04:27 PM ET (US)     Profile for Ed Z  Send Email to Ed Z     
As I see it , there are two things that can lead to expensive and sometimes permanent engine damage.. One is lubrication and the other is cooling.. most everything else may cause an inconvience but usually easy and inexpensive to repair.. I inspec my impeller every spring.. If you have a temp gauge setup you can also monitor it for gradual increases in operating temps..
whalernut posted 05-30-2002 03:00 PM ET (US)     Profile for whalernut  Send Email to whalernut     
Justin, I have the same engine and year as you and it still runs strong, but they are gas hogs!! Jack.
Lil Ernie posted 06-02-2002 05:19 PM ET (US)     Profile for Lil Ernie  Send Email to Lil Ernie     
Justin, In case you asked and I did,nt hear you, I love my Currituck! I would'nt trade it for anything! (wanna buy my interier?)
Want a Power Bar?

Red Eyes in the Morning,Depends at Nite
Your Pal, jack

whalernut posted 06-02-2002 07:36 PM ET (US)     Profile for whalernut  Send Email to whalernut     
Guys is this Lil Ernie another Psyco or what, he posts about the same message in the subjects he responds to, why do we have to get these people on here!!! Jack.
Steve Leone posted 06-02-2002 08:02 PM ET (US)     Profile for Steve Leone  Send Email to Steve Leone     
jxs226: sounds like your block is clogged up. do you run in salt water? a waterpump may be in order but first have the lower unit off and run a garden hose with an adaptor on to the water pick-up tube. you should have very good flow. on almost all outboards there is a bypass through the thermostat housing(s). its there just in case your thermostat sticks. the water should not be scading hot when your outboard is running. is there excessive steam? that peticular model i believe has the thermostats (2) at the back coming off the exhaust hsng, not the block or heads. most fat fours are the same. you may have to r and r the cooling system. steve out. ps bfore you do this TAKE A COMPRESSION TEST!!!

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