Tohatsu 20hp Oil Pressure Issue

Yetii88

Cadet
Joined
Apr 11, 2008
Messages
9
I bought a new 20hp Tohatsu in June and like it so far, it has about 9 hours on it. I have had a small issue with it not idling one morning so I took the carb off and cleaned it and it now idles again perfectly. I just assumed some junk in the carb low speed jetting passages from the production of the engine.
But the one issue that has happened twice and is unsolved is, when I started the engine the red oil pressure light did not turn off in a couple of seconds like normal. When that happened I stopped the engine and checked the oil level, which was fine both times and I restarted the engine, and the light turned off like normal. Has anyone seen these symtoms? Could the oil pressure switch be sticky? Where is it located on the engine? By the way I use 10W-30 FC-W Shell Nautilus oil.
 

TOHATSU GURU

Admiral
Joined
Jul 22, 2004
Messages
6,164
Re: Tohatsu 20hp Oil Pressure Issue

It's probably a bad ground. Run the engine into a dealer and let them check it under warranty. The oil pressure sender is on the side of the engine block.
 

Yetii88

Cadet
Joined
Apr 11, 2008
Messages
9
Re: Tohatsu 20hp Oil Pressure Issue

I will take a look into that. Thanks for your help.
 

StuBone278

Seaman Apprentice
Joined
Jan 21, 2008
Messages
33
Re: Tohatsu 20hp Oil Pressure Issue

Mine does that also, brand new Tohatsu 20. I didn't notice until the rev-protector kicked on around 3000 rpms. Shut down, restart, and it goes away every time.
 

byg

Cadet
Joined
Jun 20, 2007
Messages
20
Re: Tohatsu 20hp Oil Pressure Issue

Has anyone figured this out yet? I have 2011 and it does the same thing.

Woops, I noticed this is an old thread Sorry... But I would still like to know if anyone has any info
Thanks
 

TOHATSU GURU

Admiral
Joined
Jul 22, 2004
Messages
6,164
Re: Tohatsu 20hp Oil Pressure Issue

"Has anyone figured this out yet?"

Still a bad ground or low oil pressue or just trash in the sender. The solution is still the same too. Take it into a dealer and have them correct it.
 

DECK SWABBER 58

Lieutenant Commander
Joined
Aug 14, 2009
Messages
1,913
Re: Tohatsu 20hp Oil Pressure Issue

My 1 yr. old 9.8 4 stroke did that. My dealer replaced the computer under warranty and that fixed the problem. Hope this helps. :)
 
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