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Tohatsu 9.8 oil pressure light

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AADIVER
Admiral

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USA
966 Posts

Initially Posted - 08/02/2010 : 09:33:18

Anyone have this Tohatsu 9.8 "problem": motoring back to the marina the red oil warning light flashed on. I reduced speed and got back to the slip and killed the motor. The Manual says the red light means I have an oil pump switch problem. I checked the oil level; right to the top. I did my usual flushing routine in a bucket of fresh water and the red light didn't come on, even when I increased the rpm's. Maybe the light means I'm about to have an oil pump switch problem. Any ideas?

Frank Farmer
Long Beach, CA
aa.diver@verizon.net
http://mysite.verizon.net/aa.diver

PRETTY PENNY
'01 C-250 WK, Hull #558

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Stinkpotter
Master Marine Consultant

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Djibouti
9074 Posts

Response Posted - 08/02/2010 : 10:00:42

Never heard of an "oil pump switch". That light should indicate you have an oil pressure problem, although it could be that the oil pressure switch (that goes on if the pressure drops) is faulty. In other words, it's either the sensed or the sensor.

BTW, on a Honda outboard I once had, I got an audible alarm and check-engine light... It turned out to be a slightly corroded battery cable hookup.

Edited by - Stinkpotter on 08/02/2010 10:05:57

AADIVER
Admiral

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USA
966 Posts

Response Posted - 08/02/2010 : 15:43:08

My oil level was too high so I pumped some out and fired up the engine: no red light on. Apparently there's a pressure problem if the oil level is either too low or too high. Mine was too high.

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britinusa
Web Editor

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USA
5404 Posts

Response Posted - 08/02/2010 : 16:45:07

I had my Tohatsu 9.8hp outboard engine oil lamp come on.

I was wondering what the heck that light was for when the engine seized!

Now I check the dipstick every trip and then every other day if we're cruisin.

So that oil lamp cost us nearly $2,000

Think I should carry a spare lamp?

Paul

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Stinkpotter
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Djibouti
9074 Posts

Response Posted - 08/02/2010 : 18:28:53

<blockquote id="quote">quote:<hr height="1" noshade id="quote">Originally posted by AADIVER
 My oil level was too high...<hr height="1" noshade id="quote"></blockquote id="quote">I've heard that this can be caused by gasoline blowing by the pistons into the sump, diluting the oil and increasing its level. I'd suggest changing the oil (so you know you don't have dilution), recording the precise level, and then checking it periodically to see if it's increasing. I don't know whether dilution might cause a low pressure reading, but most engine makers strongly recommend against over-filling with oil.

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piseas
Former Treasurer

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USA
2017 Posts

Response Posted - 08/04/2010 : 13:22:51

Frank, Dave brings up a good point. Hey, did you recently change the oil yourself or have it serviced? If not, they may be worth keeping an eye out if the level increases, once you removed to correct level. Keep us posted.
Steve A

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AADIVER
Admiral

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USA
966 Posts

Response Posted - 08/12/2010 : 23:08:14

Yeah, it was too full. I just had it serviced and she runs like the proverbial top. Leaving for a cruise from Long Beach to Newport tomorrow, high pressure, light to nothing winds, so it may be a motor boat trip down and back on Sunday. Now if that oil light comes on...switch to a Honda ;-) ?

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piseas
Former Treasurer

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USA
2017 Posts

Response Posted - 08/13/2010 : 22:11:38

Frank, if you want to hook up tomorrow, let me know as I am in Newport. Where you going to park it?
Steve A

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AADIVER
Admiral

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USA
966 Posts

Response Posted - 08/18/2010 : 22:25:43

Steve, I didn't check my last post til today, sorry. The cruise was our annual to the American Legion Yacht Club, a couple miles west of the Newport Yacht Club. They gave me a slip.
Engine worked fine since the tune-up.

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piseas
Former Treasurer

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USA
2017 Posts

Response Posted - 08/19/2010 : 11:50:54

Frank, sorry I missed you as well. There is next year! I have been to the ALYC on many occasions. Great place. How was sailing. Did you sail in the harbor or outside only?
Steve A

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The Officers, Staff and members of this site only provide information based upon the concept that anyone utilizing this information does so at their own risk and holds harmless all contributors to this site.