Honeybadger31
Cadet
- Joined
- Jun 22, 2014
- Messages
- 17
I recently purchased a Johnson 250 V8 Ocean Runner from craiglsist (As my 1979 Evinrude 150 
recently blew a piston.) It has a serial number but not a model number, I was on hold with BRP for 30 minutes on two seperate occasions yesterday attempting to identify my exact model number. I will keep trying different hours etc. But I am pretty sure it is either a J250TXEOR 1995, or J250TXERC 1994. This motor sounds completely and totally awesome!! When I first started it, it popped to life! The cooling system has some unusual hoses attached to it that I haven't been able to quite identify just yet.
My question is in regards to the Thermostat. When I first fired up the motor, the Port side bank was much warmer than the Starboard side Bank, which has me concerned. Also, the indicator was not spraying water out of it, so I turned it off immediately and promptly installed a new water pump/impeller(I was planning to do this anyways). On my test run the indicator began spraying immediately. My Port Side was still hotter than my Starboard side, so my next step was to inspect my Port side thermostat. I managed to break off a bolt head holding the thermostat housing #@$%! The rubber diaphram had two holes in it, I didnt test the thermostat, just replaced both that and the diaphram and new gasket....of course after going through hell to get that bolt out of the hole!
The bolt is a long story, I ll just summarize it by saying after breaking the tap off in the hole and going through 4 drill bits and about 4 hours of chipping away at the tap, I was successfully able to get a heli coil in there! I hope I dont have to go through that ever again!
So after all of that, I run the motor again, and still the Port side was hotter than the Starboard side, although it took longer to get hot. Next I inspected the T-stat on the Starboard side and found that there was no thermostat in there at ALL!!
I have read about people intentionally removing the t-stat, so now I am thinking the Port side might be OK, just compared to the cold Starboard side it seemed hot. My next step is to install a t-stat in the Starboard side and get a thermometer to actually measure the exact temp. Does anyone have a recommendation for measuring/monitoring the temp from personal experience?
Also, What affect will this have moving forward for the performance of this motor? I still need to measure the compression after running it, the motor sat for 8 months according to the person I bought it from. I did a compression test when I first bought it, before running it, the Port side is 125/125/120/120, the Starboard side is 140/125/125/115. Writing this, I realize I should check the compression #'s again after running it.
Thank You for your inputs,
Matt
recently blew a piston.) It has a serial number but not a model number, I was on hold with BRP for 30 minutes on two seperate occasions yesterday attempting to identify my exact model number. I will keep trying different hours etc. But I am pretty sure it is either a J250TXEOR 1995, or J250TXERC 1994. This motor sounds completely and totally awesome!! When I first started it, it popped to life! The cooling system has some unusual hoses attached to it that I haven't been able to quite identify just yet. My question is in regards to the Thermostat. When I first fired up the motor, the Port side bank was much warmer than the Starboard side Bank, which has me concerned. Also, the indicator was not spraying water out of it, so I turned it off immediately and promptly installed a new water pump/impeller(I was planning to do this anyways). On my test run the indicator began spraying immediately. My Port Side was still hotter than my Starboard side, so my next step was to inspect my Port side thermostat. I managed to break off a bolt head holding the thermostat housing #@$%! The rubber diaphram had two holes in it, I didnt test the thermostat, just replaced both that and the diaphram and new gasket....of course after going through hell to get that bolt out of the hole!
The bolt is a long story, I ll just summarize it by saying after breaking the tap off in the hole and going through 4 drill bits and about 4 hours of chipping away at the tap, I was successfully able to get a heli coil in there! I hope I dont have to go through that ever again!
So after all of that, I run the motor again, and still the Port side was hotter than the Starboard side, although it took longer to get hot. Next I inspected the T-stat on the Starboard side and found that there was no thermostat in there at ALL!!
I have read about people intentionally removing the t-stat, so now I am thinking the Port side might be OK, just compared to the cold Starboard side it seemed hot. My next step is to install a t-stat in the Starboard side and get a thermometer to actually measure the exact temp. Does anyone have a recommendation for measuring/monitoring the temp from personal experience?
Also, What affect will this have moving forward for the performance of this motor? I still need to measure the compression after running it, the motor sat for 8 months according to the person I bought it from. I did a compression test when I first bought it, before running it, the Port side is 125/125/120/120, the Starboard side is 140/125/125/115. Writing this, I realize I should check the compression #'s again after running it.
Thank You for your inputs,
Matt
