Mystery to be solved - reward to whoever gets it!

[KWG]

Re: Mystery to be solved - reward to whoever gets it!

New update:

I took a LARGER galvanized tub ...(the type they put water in for cows on a farm) and had to cut a small notch in the front but it went under the boat real good. The water level comes up about an inch and a half past where the water pump housing is.

Started the engine and clear hose ran SOLID water .. no bubbles at all ...also no bubbles in the lines to the manifolds.
There were a few steam bubbles went through the manifold hoses as the tstat opened but only for about 5 seconds then everything went back solid and now the manifolds stay real cool ...both of them. I still have the cross rig on there and the Port Manifold (after engine up to temp and running 5 minutes) was 109 and starboard was 98 ! Which would be reversed when the hoses go normal.

OK Don, so does this confirm the leaking water pump base?

Also like I was saying the exhaust doesn't really show any bubbles in the tank until (earlier I said 2K but I rechecked with this tank) about 1500 rpms.

Is it going out through the transom ports until then?

BTW the water out the transom ports with this new tub setup POURS like crazy out both ports.

Seems llike it is OK but I should be able to run this on the muffs without any air being sucked in ...right?

I think a trip back to the water pump is in order.

Thoughts?

Kirk

 

[Anchor Management 1]

Re: Mystery to be solved - reward to whoever gets it!

I just ran into the same problem and it was the plastic tube that goes through the transom.It connects the hose to the outdrive,then inside the boat to the engine. It was cracked and drawing air into the system.

 

[KWG]

Re: Mystery to be solved - reward to whoever gets it!

I had not checked that but since the air bubbles stopped when I put the drive in a deeper tub I don't think that would be it.
I now have the drive off replacing & resealing the pump gaskets.
While I have the drive off I will pressure test that tube through the bell housing to the end of the hose which connects to the tstat housing just to be safe.
Thanks

 

[Don S]

Re: Mystery to be solved - reward to whoever gets it!

You are not going to SUCK air into the cooling system through a cracked fitting on the pressure side, it's just not going to happen.
I would guess that AM1 has an engine mounted pump that picks up water through the outdrive. Had he had an Alpha drive using the outdrive pump for cooling water, it would have leaked water, not sucked air.

OK Don, so does this confirm the leaking water pump base?

Absolutely. You found your problem. Fix it so it doen't leak and your overheating problem will be cured........ Unless you have 2 problems. But you still need to fix known problems to even search for other problems.

 

[Anchor Management 1]

Re: Mystery to be solved - reward to whoever gets it!

Alpha 1 Impeller is in the drive.

 

[Don S]

Re: Mystery to be solved - reward to whoever gets it!

Alpha 1 Impeller is in the drive.

Only a guess here, but perhaps there is a slight venturi effect due to the hoses on either side of the plastic tube being larger ID that the tube.

 

[CLAYAROBINSON]

Re: Mystery to be solved - reward to whoever gets it!

Have not read your hole thread, but.........

I believe you stated you clambed one side and after releasing the broblem was reversed. Stoped the engine restarted it, then it went back to the original side. For no better terms the changes from this test are from flow inertia. If this is correct I would say that you don't have enough flow to handel both sides. Can you check the actual flow rate from the water pump before it goes to the head?
One way you might find out if its a flow rate issue is restrict the water leaving the block or after it leaves the block on both sides. If the flow evens out on both side doing this then its a flow rate issue. Don't know the solution if doing this proves its a flowrate issue. Actualy I don't know anything about yours or any boat engins, just though I would though this out their. Good luck

 

[KWG]

Re: Mystery to be solved - reward to whoever gets it!

Thanks Clay,
Yes I did do volume tests (see earlier in post)
Finally found the problem by using clear tubes to see incomming bubbles which lead me to the leaking pump.
I received great advice from this forum which lead me to use the clear hoses.

I think I will use the Permatex Copper to seal it this time around.

Thanks again to everyone who gave all the great suggestions, especially Don & Jason.

Kirk

 

[JustJason]

Re: Mystery to be solved - reward to whoever gets it!

I think I will use the Permatex Copper to seal it this time around.

What you want to use is Mercury/Quicksilver Perfect Seal. If you go to an autoparts store Permatex Aviation Sealant is more or less the same stuff.

 

[saaabe]

Re: Mystery to be solved - reward to whoever gets it!

if your boat run good I dont see the problem my boat those the same thing alot more water comes from one side than the other. in one side only a bit of water and smoke come out

 

[KWG]

Re: Mystery to be solved - reward to whoever gets it!

Jason,
Merc/Quicksilver Perfect Seal is what I just used and it didn't seal right, (and I didn't skrimp on it either) I will look for the Permatex Aviation Sealant.

Thanks
Kirk

 

[JustJason]

Re: Mystery to be solved - reward to whoever gets it!

When you pull your pump back off. Have a really really good look at the sealing surfaces and make sure there's no cracks/splits/rot. Also make sure the filler block is in there the correct way to. Check it for cracks etc.

 

[muscmkr]

Re: Mystery to be solved - reward to whoever gets it!

I had same problem with a boat a long time ago. The engine ran great. No fouling, no water in the oil, just overheat from time to time. Finally when I traded it in on a new boat they found a cracked head. Hard to believe but true.

 

[KWG]

Re: Mystery to be solved - reward to whoever gets it!

Heads are brand new ...thanks.

Jason, what are you referring to when you say "filler block"? The rubber dam between the exhaust chamber and pump pickup area?

Kirk

 

[no704]

Re: Mystery to be solved - reward to whoever gets it!

Just a thought, Does one of the hoses from the T-stat run higher? that may be slowing the flow untill you clamp the other filling the first and createing a siphon effect.???

 

[Don S]

Re: Mystery to be solved - reward to whoever gets it!

Just a thought, Does one of the hoses from the T-stat run higher? that may be slowing the flow untill you clamp the other filling the first and createing a siphon effect.???

He's found the problem guys, it has nothing to do with the engine side. You just need to read some of the latest posts.

 

[JustJason]

Re: Mystery to be solved - reward to whoever gets it!

Jason, what are you referring to when you say "filler block"? The rubber dam between the exhaust chamber and pump pickup area?

Yes. Check it for cracking/splitting. It also has to sit in the cavity in a certain orientaion.

 

[badkins50]

Re: Mystery to be solved - reward to whoever gets it!

He's found the problem guys, it has nothing to do with the engine side. You just need to read some of the latest posts.

Well Don, whats your reward?

 

[badkins50]

Re: Mystery to be solved - reward to whoever gets it!

Or do you have to split it with Jason?

 

[JustJason]

Re: Mystery to be solved - reward to whoever gets it!

Donation to a childrens hospital in the name of Iboats?