Starboard manifold HOT, port COOL (UPDATE)

[Johnny Be Cool]

Here we go again, one problem after another.

1990 Regal 233 Xl Ambassador, 350 vortec, alpha one drive.

Motor was replaced 2005, with a new 350 vortec.

Its at the Mechanics shop, this past week, had Holley 600 rebuilt, new impeller and pump, replace starbord manifold, replace both flappers.

Under Muffs, motor runs great, except temp gauge goes to 220. Starboard manifold 220, port manifold 180. Did compression test, average very close to each other 190 lbs.

What could cause the starboard side to heat up.
Mech gonna take it to the lake to see if it still heats up. If it does, what might be wrong???

He said if it heats up, he'll have to clear hose it.

What are we looking for???

If cracked head, where can I get one at a good price.

 

[Don S]

Re: Starboard manifold HOT, port COOL ?????

Re: Starboard manifold HOT, port COOL ?????

First thing that caught my eye was that you replace only the starboard manifold. You never replace those in sections. If you need a new starboard manifold, you replace the port as well and both risers. Otherwise you are going to have yearly or weekly problems with overheats.
Water flows throught the path of least resistance.

The clear hose test looks for air getting into the raw water cooling system someplace.
Highly doubtful that it's a cracked head.

 

[Johnny Be Cool]

Re: Starboard manifold HOT, port COOL ?????

Re: Starboard manifold HOT, port COOL ?????

I didn't know that.

The boat was brought to the shop because of a over heat condition. The starboard manifold was leaking a tiny bit to begin with. We felt best to rule out and replace cooling sections. We were trying to isolate the problem and rule out the obvious.

I ask you. What is your therory on why the new manifold cause's an overheat condition? Wouldn't the port side be hotter than the starboard due to more corrosion. This is a fresh water operation

Do you think replacing the risers and port manifold is going to stop the over heat on the starboard side?????????

 

[Bondo]

Re: Starboard manifold HOT, port COOL ?????

Re: Starboard manifold HOT, port COOL ?????

Ayuh,... When the motor was swapped in 05,...
How Much of the motor,..?? Long block, or bobtail motor,..??

If a bobtail complete motor, with T-stat housing,....
You might need to add the check-balls,...

 

[Johnny Be Cool]

Re: Starboard manifold HOT, port COOL ?????

Re: Starboard manifold HOT, port COOL ?????

The prior owner just replaced the long block. It appears they swapped from the old to the new.

When the mechanic took the thermostat housing off today, he found No thermostat and no brass ring. He still believes that the NO thermostat has nothing to do why it's over heating on the starboard side.

Not to be rude, but I don't understand the term balls. Please explain.
Thank you.

Also, when you mention "raw water" could that be a test for a, a cracked block? What does the raw water test actually show.

 

[Bondo]

Re: Starboard manifold HOT, port COOL ?????

Re: Starboard manifold HOT, port COOL ?????

but I don't understand the term balls. Please explain.

Ayuh,... The T-stat housings using Alpha 1 drives have plastic check-balls in the lines to the risers...

When the mechanic took the thermostat housing off today, he found No thermostat and no brass ring. He still believes that the NO thermostat has nothing to do why it's over heating on the starboard side.

Fix/ Replace that Problem before moving forward,... All the pieces are Important....

 

[sea flower]

Re: Starboard manifold HOT, port COOL ?????

Re: Starboard manifold HOT, port COOL ?????

May I suggest that the exhaust flapper checks are not openning enough. I put new ones in this year and one side was hotter as well. When I replaced the elbow couplings I noticed one of he flappers had lost the rubber. I removed the rubber from the other one and things cooled off. I don't have a T'stat either.

 

[Johnny Be Cool]

Re: Starboard manifold HOT, port COOL ?????

Re: Starboard manifold HOT, port COOL ?????

I will mention those thoughts to the mechanic.

I find it weird that the reason it was in the shop was because of an overheat problem. The starboard mainfold had a tiny crack above the half moon circle near the hole that the mounting bolt goes through.

Was that an indicator of why it's over heating.

I can see that maybe the check ball might be the culprit.

I have read on several post that hot starboard manifolds ran cooler and the same degree as the port side when running in a large body of water (lake).

Being that the compression check was good. Can we rule out cracked block, cracked head or blown head gasket.

 

[Johnny Be Cool]

Starboard side still hot, what next??????

Starboard side still hot, what next??????

This is a continuation from post (Starboard manifold Hot, Port still cold ????)
1990 Regal Ambassador 233 XL, Cruiser,New Long block 2005 Vortex 350, Alpha 1.

Came in for high temp.
Replaced impeller and pump (not that bad)
Replaced both flappers (both warn, mostly on port side)
Replaced starboard manifold (Had small outside crack)
Rebuilt Holley 600
New elec. fuel pump.

Ran on muffs at shop still high temp, starboard manifold hot, port a little warm.

Took Thermostat housing off, NO thermostat or brass ring (on order should be in tomorrow). Visual inspection, check balls look good.

Took to lake today, maybe large body of water will prevent heating.

Ran for about 10 minutes, in drive as well. Used heat gun, 190 steady & climbing on starboard head. 160 and steady on port. Temp kept climbing at 1500 rpm's and below.

After 10 minutes of running high temp, we upped the rpm's to 2000, the thermostat needle started to drop, WHY???

Wants to heat up on lower rpm's and starts to cool off on high rpm's

What next to do??

I appreciate all of your comments-PLEASE ADVISE-I NEED TO GET THIS FIXED NOW!!!!!!!!!!!!!!!!!!!!!!!!!!!

 

[JustJason]

Re: Starboard side still hot, what next??????

Re: Starboard side still hot, what next??????

What do you mean by "came in for high temp"? Are you a shop?

Either way, if you have an overheat that happens at low rpms but goes away at high rpm then you have a volume problem to the engine. The pump isn't pumping enough water to the motor, or it is and the motor isn't seeing it or passing it through. Could be leaking/bent/kinked hose in the transom section. Could be corroded water passages. Do a volume test as per the service manual and see what your getting for output.

 

[Johnny Be Cool]

Re: Starboard side still hot, what next??????

Re: Starboard side still hot, what next??????

I am the owner and I presently have it a the marine shop.
I was with the mechanic today when the boat was taken to the lake.

Prior to going to the lake and after the above was installed and running on the muffs. The mechanic did a compression test and was surprised how high and consident the test was, a very close average of 190

You you think by installing the thermostat would restrict the flow and allow the starboard to run cooler?

If that doesn't work, he said that he's gonna put clear hose all over to look for any air. I really don't know what that means or what he's looking for.

When you say pump are you referring to the engine water pump. The drive pump has been replaced.

Beside this problem, the motor runs great.

 

[Johnny Be Cool]

Re: Starboard side still hot, what next??????

Re: Starboard side still hot, what next??????

Where can I find the procedure for a volume test. I've looked above as well as a search, No Luck. What will the volume test prove?

 

[Johnny Be Cool]

Re: Starboard side still hot, Please advise.

Re: Starboard side still hot, Please advise.

Any suggestions, PLEASE!!!!!!!

 

[tkrfxr]

Re: Starboard side still hot, what next??????

Re: Starboard side still hot, what next??????

I had air being sucked into the water pump through a flushing system...

This thread has a diagnosis pamphlet that might help...

http://forums.iboats.com/showthread.php?t=430405

-Good luck.

 

[Johnny Be Cool]

Re: Starboard side still hot, what next??????

Re: Starboard side still hot, what next??????

Thank you for the reply. I do not have a Volvo Penta sytem, it's the Mercruiser set up with an updated Vortec motor, but I get the jest of it.

Also, I do not have the equipment needed to perfom such test. My mechanic will be perfoming a clear test, to what extent I don't know. I just hope it's not a cracked head or block. I can live with a bad head gasket. What puzzles me is that the compression test is great.

I appreciate the concern.

Any other takers?

 

[Johnny Be Cool]

Re: Starboard side still hot, what next??????

Re: Starboard side still hot, what next??????

One thing I forgot to add. Yesterday after testing at the lake, I took the drain plug out of transom and about 3/4 of a gallon of water came out.
I told the mechanic and he checked all of the seals on the drive, they were all good. He didn't know at the time why it had water. When testing, we both didn't notice any obvious leaks in the bileg.

Could this be any indication of the overheating problem we've over looked?

 

[Johnny Be Cool]

Clear hose / Volume Test PLEASE EXPLAIN

Clear hose / Volume Test PLEASE EXPLAIN

1990 Regal - 2005 Vortec 350 Carb - NON- Computer, Alpha One.

Can someone explain why a clear hose test is used, how to do it and what are you looking for in simple short terms. I know the explanation can be lengthly, please just give the basic version.

Also, is a Volume test the same and if not please explain.

I have a starboard manifold high temp situation. The above will be our next step in diagnosis.

I thank you and appreciate you help.

 

[Bondo]

Re: Clear hose / Volume Test PLEASE EXPLAIN

Re: Clear hose / Volume Test PLEASE EXPLAIN

Can someone explain why a clear hose test is used, how to do it and what are you looking for in simple short terms. I know the explanation can be lengthly, please just give the basic version.

Also, is a Volume test the same and if not please explain.

Ayuh,... The Clear hose is put into the Incomin' line from the drive to see if the pump is suckin' Air....

You're lookin' for Bubbles....

The Volume Test,.. you just Unhook the same line, start the motor,+ Measure to flow....

 

[Johnny Be Cool]

Re: Clear hose / Volume Test PLEASE EXPLAIN

Re: Clear hose / Volume Test PLEASE EXPLAIN

Bond-o Thank You!

Since the pump and impeller have been changed, I guess I would be interested in the volume test. To see why the starboard is hot (190) and port luke warm.

OR

How do you test to see if flow is good on the starboard head.
I've read that you take off the 2 large hoses on the thermostat, hang them up and top them off with water, then pressurize each cylinder independently with air to see if the water comes out of the hose. What is this test called?

I'm trying to see what test is used to locate why the mainfold is getting hot.
(under 1500 rpms, cools off over 2000 rpms) and if it is an internal problem, then the above test would be used.

 

[Johnny Be Cool]

Re: Starboard side still hot, what next??????

Re: Starboard side still hot, what next??????

Any thoughts or do I need to start a new POST.