Problem with 94 Alpha 1 Gen 2 Water Pump

[Bry21317]

Re: Problem with 94 Alpha 1 Gen 2 Water Pump

I tried to do the clear tube, and man that is a pain in the butt. I got a piece of clear tube, its an inch and a quarter diameter fort hat fitting, and its still hard to get on the Thermostat housing pipe. I tried and tried to get it with the straight connector that I got, but it would not go into my old hose. So I will have to get a 90 degree connector and hope that will fit to the original hose.

Man the lower is easier to take off then it is to try to get that clear hose in there, lol.

I was pretty upset it did not work, I wanted to see if there were bubbles in there, which I am sure there are. As it is leaking back out the prop, so I have to pull the lower again to find out why its leaking there.

I hate to do this again, but there is no other option to get it fixed. Is there anyway to not loose all the new Gear Oil I just put in?

I figure I can stick a small plug in the oil hole on the upper housing and hope that will hold most of it back in there.

Also, could the water be leaking from the Upper Water pipe, are there orings up there in the upper unit? I did not replace these, if there are orings up there. I did replace the ones on the Lower unit though. But I remember there is a metal pipe that goes up into a seal in the upper. Just thinking out loud, pretty much as this is the only thing I can think of, since it is driving me nuts to try to figure this problem out.

Thanks,
Bryan

 

[PeteHarris]

Re: Problem with 94 Alpha 1 Gen 2 Water Pump

This may be a bit simple, and I'm not trying to insult your intelligence, but on my drive (94 gen II), there is a metal pipe between the lower and upper. This pipe is shaped like an elongated S and is 6-9" long and seats into a rubber fitting in the upper and lower. I had a hard time getting it lined up properly, and later found the rubber seat had been cut. It let a lot of the water out that never made it to the engine.

 

[Bry21317]

Re: Problem with 94 Alpha 1 Gen 2 Water Pump

Pete,
Yes, I know of the pipe you are speaking of. I got it ligned up, but this is what I am wondering, does it have Orings in the upper end of the pipe that seal it? I replaced the new black plastic copupler and orings on the bottom end, but did nothing on the upper side.

This is what I was also wondering, as the water is dumping somehwere, as its flowing out my prop hub, and I have thru hull exhaust with no Switch to go through the prop, so nothing should ever come out the prop now.

I am thinking about dropping it again, just have not yet had time to drop it, and check it one more time.

Bryan

 

[PeteHarris]

Re: Problem with 94 Alpha 1 Gen 2 Water Pump

I THINK it fits to a rubber grommet-y boot thing at the top as well ... but it's been a while and I'm no expert.

 

[Bry21317]

Re: Problem with 94 Alpha 1 Gen 2 Water Pump

Just ordered one, just so that when I do drop the lower again, I will relace this to be safe.

Should be here in tomorrow.

Bryan

 

[Bry21317]

Re: Problem with 94 Alpha 1 Gen 2 Water Pump

Ok,
So I dropped the lower again yesterday, replaced the rubber gromet at the top of the water tube also. It did not look bad, but I went ahead and did it.

I also resealed the complete Impeller housing and made sure that everything was tighted to spec. This looks good, it all looked really good in there.

I also checked for air bubbles with the clear hose, and I did not see any.

I put it all back together and ran the boat for about an hour. It heated up to 175 in about 15-20 minutes. It then sat right at 175 or just a hair over.

It never ran this when I purchased the boat last year, but what should this engine run on the temp gauge? Last summer it never got over about 165, which is why I am worried. I also do not know what thermostat the guy had in there. I put in the one the manual calls for which is a 140 SS Thermostat.

I put my hands on the risers, while it was running for a long time, they never got warm. They were very cool feeling to my hands. The top of the Thermostat housing was very cool also, where the water pump intake hose comes in. The output hose to the Water Circulation pump felt very hot though. I did notice this. The hoses going to the Risers on the 6 hose Thermostat were cool, as were the hoses going to the Manifolds.

The bottom of the thermostat housing where it attaches to the Intake was the only warm/hot area to my touch.

What I if I tried just for the heck of it to put a lower temp thermostat in there, to see if that will cool it down? If that does, then should I run the correct thermostat or use a cooler one?

I just want to know why it ran cooler last summer, than it is now.

Thanks,
Bryan

 

[JustJason]

Re: Problem with 94 Alpha 1 Gen 2 Water Pump

maybe because the connections on the gauge and sender where cleaner last year.
Is it 175 on the gauge or 175 on the IR gun?
Don't trust the gauge.

 

[Bry21317]

Re: Problem with 94 Alpha 1 Gen 2 Water Pump

The Gauge and the IR both read at the bottom of the Thermostat housing, the only warm area about 178. The gauge was pretty much the same as what was showing on the Temp Gun.

Bryan

 

[Bt Doctur]

Re: Problem with 94 Alpha 1 Gen 2 Water Pump

Did you actually remove it and look at the water tube.could have a corroded hole someplace allowing water to leak.

 

[Bry21317]

Re: Problem with 94 Alpha 1 Gen 2 Water Pump

I did pull the tube out, it was a little tarnished but no corrosion at all. This is a fresh water boat. I did wipe the entire tube down with a rag and I did not see any types of leak at all, or anywhere that it might leak.

Bryan

 

[Bry21317]

Re: Problem with 94 Alpha 1 Gen 2 Water Pump

I did some tests today, and it runs right at 175 or just over on the Gauge but here are all the numbers with the IR Temp Gun.

With the 140 Thermostat in

Left Riser(driver side)- 112
Right Riser(passenger side)-74
Left Manifold(driver side)-170
Right Manifold(passenger side)- 168
Left Block(driver side)-135
Right Block(passenger side)-149
Front of the intake manifold-88
Rear of the Intake Manifold-63
Top of the Thermostat above Thermostat-115
Very top of thermostat housing between riser hoses-55

It took it 4 Minutes to warm up to 175 on the gauge


With NO Thermostat in but spacer still in place, these tests were taken after the engine had cooled, about 2 hours later. The temp on the gauge barely got up to 140.

Left Riser(driver side)- 125
Right Riser(passenger side)-106
Left Manifold(driver side)-160
Right Manifold(passenger side)- 110
Left Block(driver side)-102
Right Block(passenger side)-102
Front of the intake manifold-69
Rear of the Intake Manifold-75
Top of the Thermostat above Thermostat-93
Very top of thermostat housing between riser hoses-90

Does this help any? I was getting good water flow through the exhaust pipes. I had a buddy of mine outside the boat when running with no Thermostat and he said the water was warm coming out the exhaust when I was idling, I revved it up to 1500 and then it cooled off, he stated.

Do I have a problem, or is this what it should be running with and without the thermostat.

I ran the both with and without the thermostat for over 30 mins and then tested with the IR to get the temps. Does this look normal and I am just being to paranoid.

I also put the lower unit into a huge rubbermaid container with the hose hooked to the lower unit. Trying to see if it made any difference as if it was in the lake. No change in the temps with the Thermostat.

Will it hurt to run without the Thermostat and just leave the spacer in place?

Bryan