4.3 mercruiser steaming out of back of boat

[jdelisle]

I recently replaced both manifolds and riser and had the heads off to water infiltration.
when boat first starts there isn't any steam. The steam starts once the thermostat opens.
It was 48 degrees outside and raw.

I've updated post with picture.

 

[alldodge]

Re: 4.3 mercruiser steaming out of back of boat

I recently replaced both manifolds and riser and had the heads off to water infiltration.
when boat first starts there isn't any steam. The steam starts once the thermostat opens.
It was 48 degrees outside and raw.

Are you saying the engine starts and you have water coming out. After the time it takes for the engine to heat up and the thermostat you then see steam (maybe 15 to 30 minutes). What does 48 degrees outside and raw,,, mean

 

[flipbro]

Re: 4.3 mercruiser steaming out of back of boat

It means its cold! Hot water and cold make steam

 

[alldodge]

Re: 4.3 mercruiser steaming out of back of boat

Golly gee wiz and shucks and all other kinds of stuff Opie

 

[jdelisle]

Re: 4.3 mercruiser steaming out of back of boat

It was 48 degrees outside air temperature and raw/damp day.

 

[jdelisle]

Re: 4.3 mercruiser steaming out of back of boat

Please check out picture. Still normal?

 

[alldodge]

Re: 4.3 mercruiser steaming out of back of boat

The steam doesn't bother me that much on a 48 degree day, but the lack of water coming out the exhaust vents does. I see a lot of water coming from the muffs. Loosing that much water around the muffs is either the impeller is not working properly or a new set of muffs may be needed.

Our my assumptions correct?

 

[flipbro]

Re: 4.3 mercruiser steaming out of back of boat

Golly gee wiz and shucks and all other kinds of stuff Opie

Alldodge sorry that was ment for jdelisle not be a smartass with you lol! But stating TO HIM that at that temp and the hot water steam is normal!! This aint Mayberry

 

[jdelisle]

Re: 4.3 mercruiser steaming out of back of boat

Alldodge I'm going to change the propeller this week to be on the safe side.

Flipbro, I guess you get your name for being flip. I started this thread to get help not to be poke fun at.

 

[Pete104]

Re: 4.3 mercruiser steaming out of back of boat

It's pretty obvious in the pic that the pump ain't pulling much water. And, I can't see the tach from where I'm sitting either. Is the engine at idle or 1000 rpm or more?

Why are you changing the propeller? If you men impeller, put a complete kit in it!

Study some forums on replacing water pumps so you don't get yourself in trouble.

 

[BRG25]

Re: 4.3 mercruiser steaming out of back of boat

What temperature is the engine running at when warm. How hot do the manifolds get?

 

[jdelisle]

Re: 4.3 mercruiser steaming out of back of boat

yes I meant impeller te boat was idling at 800rpms

 

[jdelisle]

Re: 4.3 mercruiser steaming out of back of boat

The engine temperature was 170 riser temp port side 119 and starboard side 88.
I ran the engine after that and there was onle a 10 degree difference between risers

 

[jdelisle]

Re: 4.3 mercruiser steaming out of back of boat

replaced impeller which looked in good shape. Ran boat on trailer in the lake and everything runs great.