77 Johnson conversion pee hole

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DA505

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Aug 2, 2012
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Has anyone here added a water spray indicator by drilling a block and tapping fitting with hose through cowling on a motor that previously did not have one? Would that indicate the t-stats are good also if water is spraying out?
 
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Daviet

Fleet Admiral
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Sep 24, 2008
Messages
8,958
Re: 77 Johnson conversion pee hole

Lots have done it, run a search and you will find several posts on it.
If done like the factory, the tell-tale is before the thermostat, it shows that the water pump is pumping. You can still have an overheat condition even if the pump is working correctly. A defective thermostat(s), head gasket, gromets a probably several other things.
 
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D.spencer

Petty Officer 1st Class
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Sep 5, 2008
Messages
200
Re: 77 Johnson conversion pee hole

There was a real good article by ezmobee I think that showed exactly how to do this and there even was a sticky a long time ago. The post gave part numbers and detailed instructions on how to add one where there wasn't one. It inspired me to do mine ;)
 
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emdsapmgr

Supreme Mariner
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Dec 9, 2005
Messages
11,551
Re: 77 Johnson conversion pee hole

Another option might be to find a used outer exhaust cover from a later model and just swap it out.
 
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DA505

Recruit
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Aug 2, 2012
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Re: 77 Johnson conversion pee hole

Well then I'm gonna do it. Just a little nervous. What then is the best way to confirm the thermostats are opening?
 
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emdsapmgr

Supreme Mariner
Joined
Dec 9, 2005
Messages
11,551
Re: 77 Johnson conversion pee hole

Start your engine cold, running on the garden hose. Hold your hand back by the two exhaust relief holes in the exhaust housing. After about a minute, water droplets will form on your hand. That indicates the thermostat (vernatherm) has opened. A good/normal sign.
 
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