1987 15hp evinrude water pump repair

[affadoo]

Re: 1987 15hp evinrude water pump repair

thank you bf for that awesome website NOW i know where to go for the shft rod cpling ... however i find it evn more challanging removing the upper 6 bolts on my long shaft extension than the lower ones .... is there a special wrench for this .... the head on my ratchets is a little too big to get a fairlead to the bolt head and while i can get an open end wrench on it ... there's no room left to turn it .... i got a couple of bolts out but i dont want to strip the stubborn ones ... right now they're soaking in WD 40

 

[iwombat]

Re: 1987 15hp evinrude water pump repair

Regular old box-end wrench is the way to do it. Takes awhile, but that's what you gotta use.

 

[BF]

Re: 1987 15hp evinrude water pump repair

glad you're finding it useful... it's a great site.

You might consider getting a short "wobble extension" for your socket set. It allows about 15-20 degrees of wobble in the connection between the socket and the extension to allow you to use a socket in tight spaces. Usually not included at socket sets, but should be. Will be available at automotive place that sells socket sets.

good luck.

 

[affadoo]

Re: 1987 15hp evinrude water pump repair

ya know ... i tried the box wrench but the outside rounded edges left me no room to turn it ... i was gettin ready to grind the shoulders down on the box wrench when i decided to give it one more try with the ratchet and a really long extension .... that did the trick .... and i'm pretty sure ... thankfully ... the last owner used never seize ... and i'll do the same .... soooooo that long shaft extension didnt drop right out so i'm goin for my rubber mallot .... thnx again for all the help and the quick replies ............ i'm sure i'll be back again shortly

 

[affadoo]

Re: 1987 15hp evinrude water pump repair

ok i'm rappin it pretty good with the hammer and it opened enuf to get a scraper blade in there ... and after a little prying and tapping i.ve git it open unuf to get a screwdriver in there .... but it seems to be done movin now .... an awful lot of salt came out with the tapping ..... it's a saltwater engine .... i wonder if it's dried salt holding it up .... i dont wanna bang or pry too hard and damage something

 

[Commando C2]

1989 15hp evinrude water pump not pumping?

1989 15hp evinrude water pump not pumping?

Hello Everyone

This is my first post but been reading through many posts and threads to accumulate knowledge.

I am having a problem with my 1989 15hp Evinrude short shaft 2 stroke.

She wasnt pumping any water so have managed to drop the lower unti successfully and replace the impeller (with good info from this thread) and installed it in the correct direction with the key in place.

On start up she still doesnt pump any more water. There was a good pee stream for about 3 seconds then dribbles.

I will be looking into any blockages in the pipes but am wondering about a couple of things?

1. The thremostat. Where is it and will it cause this problem? ( i think that the thermostat reduces water flow until the engine is warm so this shoudlnt affect it?!??)

2. The water pump housing plate.

There was no gasket between the pump housing and the metal part of the gearcase housing. Should there be one.
I see on a diagram that there should be an impeller plate housing that sits between the housing and the gearcase.

What difference would it make not having one there?
Does the housing rely on a air tight seal? i am assuming that as the whole gearcase is in the water it shouldnt make any difference to this sealing.

I have been told to seal the pump housing with some silicone sealer? is this bad?
Any help would be greatly appreciated.
Just not sure where to look next but am gonna pump some compressed air back through the pee hole pipe and up the water tube when i drop the gearcase next time.

Many thanks

Nathan

 

[Commando C2]

1989 15hp evinrude water pump

1989 15hp evinrude water pump

One more thing...
What is the water outlet line grommet?

I also want to buy a bigger rubber cup that the water tube slots into as it didnt seem a very tight fit and could be loosing water there?

thanks
nathan

 

[Daviet]

Re: 1987 15hp evinrude water pump repair

ComandoC2, Welcome to the forum, you need to start your own post or you are going to get mixed in and lost.
1- there is a thermostat and it is located in the cylinder head. The thermostat does not control the tell-tale, it is controlled by the water pump.
2- There has to be a plate between the water pump housing and the lower unit, it provides the bottom half of the water pump assembley.
Take a look at a parts breakdown of your engine and you will see what is supposed to be where.
The water pump is under water only until the boat is on plane, then the water is forced to the pump by pressure of the lower unit going through the water.
I personally don't use a sealer on the pump housing, although you will read where others do.
With the engine running use a piece of weed eater string and clear the tell-tale tube with it.

 

[bktheking]

Re: 1989 15hp evinrude water pump

Re: 1989 15hp evinrude water pump

Thermostat is at the top of the head under a cover, this will not stop it from spraying water out the the telltale, it is before the stat. Try cleaning out the tell tale and tube and fitting in the powerhead.

The water pump's on mine didn't have a gasket, I replaced the impeller without a gasket, it pumps fine. There should be a metal plate between the plastic pump and the lower unit with a slot cut out of it near the middle hole for water flow.

Water outlet line grommet could either be the rubber piece the copper tube runs into on the water pump or the grommet at the top of the copper tube in the exhaust housing. If you are having water flow issues this could be the culprit. The powerhead as to be removed, a new gasket purchased for the powerhead to lower housing , remove the exhaust let and replace the grommet. To check water flow, remove the lower unit and make an adapter to go from the garden hose to the copper tube, this will also flush any debris out of the system.

 

[Commando C2]

Re: 1987 15hp evinrude water pump repair

Thanks for those prompt replies so far guys.

It seems i am missing the impeller plate so will try and get one ordered asap.

Will try clearing the pipes out tomorrow and blasting some hose pressure through it.

So, assuming there are no pipe blockages, even without the impeller plate fitted between the housing and the gearcase should i expect the engine to pump some water or at least have a weak stream.


I have only recently got this engine. The previous owner didnt know much about them as he said he started it out of the water to keep it turning over!!! hence why i went straight for the impeller when it didnt pump any water.
There was also a reasonable amount of saltwater corrosion in the gearcase cavities so guessin he didnt flush it very often!!

thanks again.

 

[Daviet]

Re: 1987 15hp evinrude water pump repair

I would expect with the proper parts in the water pump to see a strong tell-tale.