175 vro getting hot on port side

Mikered3500

Petty Officer 3rd Class
Joined
Jun 11, 2018
Messages
80
Runs fine, just replaced thermostats today, but port side gets super hot to the point you can't touch it within minimin of idling while starboard takes a few minutes to warm up, and when it does I can hold my hand on it without burning myself .any ideas?
 

racerone

Supreme Mariner
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Dec 28, 2013
Messages
38,411
Look into water diverter / guide problems.----They are in the water jackets.
 

Mikered3500

Petty Officer 3rd Class
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Jun 11, 2018
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Any tips or tricks to remove head bolts without breaking them off?
 

Joe Reeves

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Feb 24, 2002
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13,262
********************
(Water Deflectors)
(J. Reeves)

Water deflectors are actually lengths of 3/8" outside diameter rubber hose, installed between the top cylinder and any cylinder beneath it, and also between the bottom cylinder and the block. The purpose of the deflectors is to have the water follow a definite path around the cylinder walls. Unfortunately the deflectors between the cylinders will at times swell sideways due to either a previous bad overheating problem, or simply due to age and salt corrosion. This causes a water flow restriction which usually allows the water to cool sufficently at low rpms but not at the higher rpms.

This hose material can be purchased reasonably at any automotive parts type store if you care to make your own, or you can purchase individual deflectors at any Evinrude/Johnson dealership at a somewhat higher cost.

Removing and installing them can be a hassle at times, but not always. I use a sharply pointed scribe with about 1/4" of the tip bent at a right angle whereas I can reach in, jab the tip sideways into the rubber, then yank it out. It's necessary to clean the seating surfaces where the ruber contacts the block with a small rat tail file to eliminate salt deposits etc. When installing the new rubber deflector, coat the deflector and the metal surfaces with WD40 which will act as lubrication to allow it to go in as easily as possible.

Make sure that you insert something into that deflector area before cutting and installing the deflectors if you make your own so that you will be certain that they are the right length and also that they will be seated properly. Usually a very small amount will be left extending about the block sealing area..... simply cut the excess off with a single edge razor blade.

********************
 

Mikered3500

Petty Officer 3rd Class
Joined
Jun 11, 2018
Messages
80
I finally got a nice sunny day today and pulled both brand new thermostats out, fired it up on the hose, water came out of both sides of the motor, this time the port side bank I could actually touch and not burn myself, water coming out of that bank was warm. Starboard side was flowing cold water out with looking/smelling like exhaust. Any suggestions next?
 

Joe Reeves

Supreme Mariner
Joined
Feb 24, 2002
Messages
13,262
I finally got a nice sunny day today and pulled both brand new thermostats out, fired it up on the hose, water came out of both sides of the motor, this time the port side bank I could actually touch and not burn myself, water coming out of that bank was warm. Starboard side was flowing cold water out with looking/smelling like exhaust. Any suggestions next?

Yes... reread the above replies. Why is it that a person will ask a question of people who have been in the marine business for over thirty years or so.... then completely ignore the free information and go off on some other quest of their own which is a waste of time.... It really is a mystery!
 

Fed

Commander
Joined
Apr 1, 2010
Messages
2,457
Is the little hole in the back of the Port side thermostat housing clear?
 

Chris Stydom

Recruit
Joined
Sep 29, 2018
Messages
4
Hi All

I have a 175 V6 Model J175GLERA. Changed all the gear box seals in the lower unit as I had water in my oil. After reinstalling it all my starboard side Bank is getting extremely hot. 110celcius + and going into overheat alarm. Port side maintaining around 70celcius. This is all while running on bunny ears on the trailer. I did try swop the thermostats around with no change. I also ran the unit without the starboard thermostat and I did see after a minute or so water circulating in the starboard block.

I also changed my plugs from Chnapion to NGK not sure if This would have changed anything?

I did manually feed water in through the thermostat opening to confirm that there is no blockage.

I read the recommendations about the deflectors mentioned earlier. Would this be a similar issue to look at in my unit? Does this mean I need to remove the head?
 

racerone

Supreme Mariner
Joined
Dec 28, 2013
Messages
38,411
CHRIS ----It is very important to post a new topic.------You may also find that your 60 degree looper does not use the deflectors !!
 

Joe Reeves

Supreme Mariner
Joined
Feb 24, 2002
Messages
13,262
Any tips or tricks to remove head bolts without breaking them off?

Use a hand held propane torch to heat the aluminum surrounding the bolt(s)... the aluminum will expand faster than the steel bolts to help loosen them.
 

Mikered3500

Petty Officer 3rd Class
Joined
Jun 11, 2018
Messages
80
Joe Reeves...I read your advice about the deflectors...I was trying to ask if there was any other advice before pulling the heads which is what I'm trying to avoid if possible. No need to get nasty over nonsense .if you feel that way then don't comment on my posts. Simple as that. I will pull the heads when I get a chance and report what I find when I do.
 

Mikered3500

Petty Officer 3rd Class
Joined
Jun 11, 2018
Messages
80
Pulled the heads off...then the water jacket covers. Appeared to be clean, no blockages, water deflectors were still in correct position. But. Starboard side head was clean as a whistle where as port had carbon deposit on it...would that be a faulty head gasket???
 
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