Just did impeller, boats still over heating. Need resolved asap!

[Newbie@boats]

I just did my Merc Crusier Alpha One 165 Impeller on the outdrive, and I also just did my shift cable.

Took the boat out after about 2 minutes the temp gauge went to 240, turned around and saw what I thought was smoke coming from under the motor cover. I opened it up and you couldnt see for about a minute until all the smoke went away.

I let the boat cool down, started it up, and I have water coming out of a little hole on the side of the water pump cover.

I do not have a belt driven water pump, my water pump is internal.

The boat is an Imperial VC200.

Can I replace this myself? How hard are they to do, and I looked online and cannot find one anywhere?!?!

Help me please

 

[Don S]

Re: Just did impeller, boats still over heating. Need resolved asap!

Did you check the boat on muffs after replacing the impeller in the drive? Did it pump water then? I'm guessing you burned up the exhaust hose between the riser and exhaust tube because there was no water flowing.

You do have a belt driven water pump, it's called a circulation pump. But if you don't have water going through the heat exchanger, you have no cooling. It's like no air over your cars radiator. No air, you have an overheat.

Did you check the antifreeze in the expansion tank before you started? was it full?

The bad thing is your overheat on a 470 type engine. That spells almost certain head gasket failure on open deck design.

I let the boat cool down, started it up, and I have water coming out of a little hole on the side of the water pump cover

Have no idea what you are referring to. You also said you don't have a belt driven pump. So, what were you looking at?

 

[bomar76]

Re: Just did impeller, boats still over heating. Need resolved asap!

Don I think he says he has the straight 6 165..... RWC I would guess.

 

[Bt Doctur]

Re: Just did impeller, boats still over heating. Need resolved asap!

50-50 shot, what he should do is go here and read this
http://forums.iboats.com/showthread.php?t=220416

 

[Don S]

Re: Just did impeller, boats still over heating. Need resolved asap!

Don I think he says he has the straight 6 165..... RWC I would guess.

I don't think so, look at his signature, in 87 the 165 was a 470 style engine.

1987 Imperial VC200. 165 Merc crusier Alpha one outdrive.

 

[bomar76]

Re: Just did impeller, boats still over heating. Need resolved asap!

I don't think so, look at his signature, in 87 the 165 was a 470 style engine.

I stand corrected.
I'll buy you a beer at the Red Brick next time you are in the area

 

[achris]

Re: Just did impeller, boats still over heating. Need resolved asap!

You are quite correct, you DO NOT have a BELT DRIVEN engine water pump. It's bolted to the end of the camshaft and is inside a housing.

You appear to have 2 problems (many more now that you have overheated it and run it without water).

Problem #1, no water. Did you run the engine on muffs after you changed the impeller? You could have missed the water tube in the leg as you put the 2 halves back together. (Done it a couple of time myself, but always found it on the muffs).

Problem #2, water from the engine pump weep hole. That means one of the 2 camshaft seals is leaking. That NEEDS to be fixed. Next step is to dump the entire contents of the cooling system into the engine oil... Not a good look.

New problems caused by the overheat and lack of cooling water to the heat exchanger. Many!

1. Head gasket.... May have been damaged by the overheat. Only pulling the head or time will tell.
2. Burnt exhaust bellow (Immediately below the exhaust elbow). That's the most likely source of the smoke. They will have internal injuries.
3. Burnt exhaust shutter. Replace it when you replace the bellows.
4. Water pocket cover in the top box of the drive. It's made of plastic and 95% likely you have melted it with uncooled exhaust gas. It's a bear (not allowed to use real words here ) to replace, and if you don't replace it, raw exhaust gas will contaminate the cooling water from this day forth, and you will have perpetual cooling issues until you (or someone else) does.

You can download the ENGINE and DRIVE service manuals and have a look at what's involved. You may consider a re-power. I think most people would at this point.

Chris........

 

[HT32BSX115]

Re: Just did impeller, boats still over heating. Need resolved asap!

1987 Imperial VC200. 165 Merc crusier Alpha one outdrive. Do not know much about them, hopefully you guys can help me figure things out!

Well,
Since no one else said it.....I'll say it....

If you're going to ask specific questions about your engine/drive, INCLUDE the serial numbers of both the engine and drive and we won't waste bandwidth trying to figure out what you REALLY have!



Cheers,



Rick

 

[Don S]

Re: Just did impeller, boats still over heating. Need resolved asap!

We know what it is Rick. In 1987, Mercruiser named the 470 engine a model 165.

 

[HT32BSX115]

Re: Just did impeller, boats still over heating. Need resolved asap!

Yeah, I know...... I guess that was just for the rest of the viewers........ I thought he meant 165 I-6 at first too!

I do not have a belt driven water pump, my water pump is internal.

This should have given it away I suppose!!

 

[achris]

Re: Just did impeller, boats still over heating. Need resolved asap!

Yeah, I know...... I guess that was just for the rest of the viewers........ I thought he meant 165 I-6 at first too!

This should have given it away I suppose!!

And '1987' and '165' is a bit of a clue too...

 

[Don S]

Re: Just did impeller, boats still over heating. Need resolved asap!

I do not have a belt driven water pump, my water pump is internal.

This should have given it away I suppose!!

Hey, even that one went right over my head. :redface:

But I still knew what engine it was.

 

[bomar76]

Re: Just did impeller, boats still over heating. Need resolved asap!

Quote:
I do not have a belt driven water pump, my water pump is internal.


Could have referred to no belt driven sea water pump mounted on engine, pump is internal in the drive.

 

[Newbie@boats]

Re: Just did impeller, boats still over heating. Need resolved asap!

The boat only went into the 240 temp zone for about 10 seconds then I immediately shut the boat off waited for it to cool down to about 120 before restarting it. The weep hole is where the water is coming out from.now I know on cars when the water pump seals go inside the coolant will come out of that hole.

Where can I find a new water pump??? Are they hard to do?

Please help.

 

[achris]

Re: Just did impeller, boats still over heating. Need resolved asap!

Have you downloaded the service manual yet? If not, do so, it's all there.

You don't 'replace the water pump' on these engines. All the water pump is, is an impeller inside a cast housing, and that housing is part of the engine. For this problem all you need to do is replace the seals on the end of the camshaft....

By the time the engine reach 240, the rest of the damage was already done.

Sorry, that's the way it goes.

Chris...........

 

[Newbie@boats]

Re: Just did impeller, boats still over heating. Need resolved asap!

Where can I download the service manuals? Will that give me a step by step on how to do it?

Where can I find the new seals? Anyone know

 

[Bt Doctur]

Re: Just did impeller, boats still over heating. Need resolved asap!

The very first post, "Adults Only" section.You will find the procedure for downloads

 

[Newbie@boats]

Re: Just did impeller, boats still over heating. Need resolved asap!

http://www.sterndrives.com/470_coolant_leak.html

that's what I found online. Does not seem to bad to do also at the bottom of the page it has all the parts needed.

Now how many people here have owned the motor I have and have actually worked on one. I'm getting all of peoples opinions now is that from first hand experience or what you heard or read??

 

[achris]

Re: Just did impeller, boats still over heating. Need resolved asap!

I'm a certified Mercruiser tech, I work on them regularly.

Good enough?

Chris.......

 

[Don S]

Re: Just did impeller, boats still over heating. Need resolved asap!

I'm a Merc tech also, and have worked on many of the 470. Seems the only one here with little or no experience on these engines is you.
That leak you have a link to is for a coolant leak that puts antifreeze into the oil pan, not an overheat problem.
You don't know what to call things and don't understand how the cooling system works, or what does what, but you want to tell us we are all wrong. Fine, you are right.

Good luck with your problem, I won't bother you any more.