motor running too cool? 1984 Johnson 140 2 stroke.

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Hennysemitara

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port side is about 30 degrees cooler then the starboard. i changed thermostats, water deflectors, cleaned in water jacket n head. changed water pump and impeller. port is 120 at idle and starboard is 150-160 at idle.
 
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Hennysemitara

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even when i disconnect the hoses that go into the thermostat housing, the temp is still diffrent
 
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boobie

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Then there's something wrong in the power head. Water deflectors in wrong ??
 
interalian

interalian

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You say the stbd head runs hotter at idle, even with the outlet hose off. If you have BOTH hoses off at the same time, do you see the SAME amount of flow from each head?
 
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Hennysemitara

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interalian said:
You say the stbd head runs hotter at idle, even with the outlet hose off. If you have BOTH hoses off at the same time, do you see the SAME amount of flow from each head?
Click to expand...

Yes same amount of flow, yet even with the hoses disconnected port runs cooler
 
interalian

interalian

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That kinda leaves the deflectors in question. Port side does typically run a few degrees warmer, but 30 is way more than a few degrees.
 
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Hennysemitara

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interalian said:
That kinda leaves the deflectors in question. Port side does typically run a few degrees warmer, but 30 is way more than a few degrees.
Click to expand...

yeah thats what i was thinking. but i changed the deflectors they went all the way in..im stumped.
 
interalian

interalian

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Sorry, I meant starboard (I'm nautilcally challenged) head runs hotter, port runs cooler. The deflectors are fitted toward the outside of the block on each cyliner bank. The one in between the two cylinders is obvious for location, and the lower one has to go directly below it.

Hate to trot out this picture again, but...

 
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emdsapmgr

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When you had the thermostat assy apart did you check the two pinholes in the plastic valve body? One for each side of the powerhead. If either of the two holes clogs up, it will shut the water off for that side of the head and you'll get an overheat. These need to be cleaned each time the thermostat housing is pulled apart.
 
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daselbee

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^^^^^^^^Like he said.....
I need more info. How are you measuring temps, where are you measuring temps, and most importantly, when those hoses are disconnected, free flowing water out into the lower pan, what is the temp of that water? Surely you can measure that temp the same way you are determining that one side is hotter than the other.

If that water temp is the same on both sides, then the PLACE you are MEASURING is hotter, not the whole engine bank.

If it happens to be the same temp on both flows of water, then that brings me back to the head and head cover assembly. Especially if you are measuring temps on the head cover surface.
 
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Hennysemitara

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emdsapmgr said:
When you had the thermostat assy apart did you check the two pinholes in the plastic valve body? One for each side of the powerhead. If either of the two holes clogs up, it will shut the water off for that side of the head and you'll get an overheat. These need to be cleaned each time the thermostat housing is pulled apart.
Click to expand...

yes both holes are clear...
 
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Hennysemitara

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Aug 4, 2016
Messages
175
daselbee said:
^^^^^^^^Like he said.....
I need more info. How are you measuring temps, where are you measuring temps, and most importantly, when those hoses are disconnected, free flowing water out into the lower pan, what is the temp of that water? Surely you can measure that temp the same way you are determining that one side is hotter than the other.

If that water temp is the same on both sides, then the PLACE you are MEASURING is hotter, not the whole engine bank.

If it happens to be the same temp on both flows of water, then that brings me back to the head and head cover assembly. Especially if you are measuring temps on the head cover surface.
Click to expand...

i use a lazer temp, i shoot all over the head ex. starboard base of sparkplug, port side base sparkplug, side of heads same areas port and starboard. i will try measure the water temp like you said. will keep you folks posted/
 
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