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Proper heat range on Johnson 115

I

ira4bees

New member
Can someone please tell me what the proper heat range should be when read from an infrared gun? I have a Johnson 115 1998 bubbleback. It seems to be a little hot when I put my hand on the heads.
Thanks
 
At idle or full throttle.----Have you replaced impeller every 5 years ?----Having issues with that crossflow motor ?-----Do a compression test for future reference.---Post the actual values here.
 
Both, idle and full throttle.
Just bought the motor so I don't know when the last time the impeller was replaced. Telltale pee is very strong.
Compression on all four cylinders is 110.
 
Testing in a bucket of water ?----Is the alarm sounding ?----Have you tested the alarm?---I would replace the impeller first.-----And if that is not the cure look into an item called a " divertor " in water jackets.-----There are 2 on each side found after removing a cylinder head.
 
ira4bees said:
Can someone please tell me what the proper heat range should be when read from an infrared gun? I have a Johnson 115 1998 bubbleback. It seems to be a little hot when I put my hand on the heads.
Thanks
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The temps shown with an infrared heat gun can vary wildly, depending on where you aim the beam.
Best get an OEM shop manual. The older ones speak of using a calibrated wax crayon, & where to swipe it. My ‘94 manual states where on the cylinder head to measure temps.
 
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