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2006 Mercury 90 hp. 4 stroke oil tank sensor

Alarm comes on when key is in the on position. need to show oil tank removal.

Posted by Anonymous on


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  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi there,
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Posted on Jan 02, 2017

  • 53 Answers

SOURCE: skipping, lack of power, 4 stroke mercruiser

has your boat been sitting more than 60 days. ethanol gas has been proven to only stay stable for 30 days in 90 degree + weather. Labor cost can be up to $100.00 per hour. CHEAP TEST- compression, spark, and fuel. TOOLS(1) A compression gauge (2) a spark gap tester.(3) A Clymer service manual for your engine. (you can purchase from your local dealer). I know all these are expensive but if your going to be a outboard owner you will always need them. TROUBLESHOOTING (1) check compression. without the year model I'm giving you a average numbers. Look at your Clymer manual for specific numbers. all cylinders need to be over 100 lbs and equal each other within 5 lbs.(2) check spark. use a spark gap tester all cylinders should jump a half inch gap. if you have good compression and good spark, fuel is the problem nine times out of ten. Drain gas tank,clean fuel lines replace primer bulb and replace all fuel filters. Finally replace spark plugs, I know spark plugs probably don't look bad but this is a outboard. Fresh spark plugs means less resistance for the ignition system. The ignition system is week compared to automotive. Test drive boat, if the problem is still there then there is further steps to take. Again I don't know the year model so I guessing its fuel injected. Pull out your clymer manual. what is great about the Clymer Manual for Novice techs is it gives detailed info on your outboard. Troubleshooting tips and teaches you how your outboard works.

Posted on Nov 03, 2009

  • 51531 Answers

SOURCE: what oil do i use in the lower unit of a 1989 90

go to a marine store and get lower unit gear lube. it comes in a squeeze tune and just remove the plug and squirt it in . both screws need to be out tho upper one lets air out as you push new in lower .the put upper back in first keeping oil in till you put in lower plug

Posted on May 01, 2010

SOURCE: need oil change in water

Turn The Boat Around So That The Engine is Nea The BankrUn Bolt The Gear Box From The Engine On The Bank,
Change The Impeller On Dry Land Replace Gear Oil and Re Fit
The Gear Box.
The Engine Does Not Have Oil Change Unless It Is A Four Stroke.
If It Is The Drain Plug Is On The Side Of The Mid Section And Can Be Drained With Leg Trimmed Up About Half Way
Sorry This Is Best Way.

Posted on Mar 17, 2013

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1 Answer

Other than head gasket how can water get into oil on 90 hp 4stroke merc ob

Water seldom gets into the engine oil, but more often in the lower gear case through the seals behind the propeller. If you have water in the oil of the head unit, then a blown head gasket is likely the cause.

Seems to be a known problem, and may just be the gasket between upper and lower unit.

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90 hp Mercury 4 stroke Oil indicator light won't quit flashing

First of all, check your oil level.
Second, you'll find on the engine, port side, above the air intake canals ( just before the throttle body ) a oil pressure switch. Disconnect that switch, goes the light off? If no, it's an electrical issue, check if that wire isn't damaged and shorted to earth somewhere.
If YES, then remove the oil pressure switch and connect a presure gauge on the engine. 0 to 5 bar. Start the engine, you should obtain more than 1.5 bar pressure. If OK, replace the oil pressure sensor. If no pressure, have the engine rebuild.
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2006 mercury outboard opti max 200 engine alarm, (4 beeps). oil was run low, do i need to prime the system or should it prime itself?

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Which alarm is sounding? Oil or overheating? You need to figure this out first! ... Is the water coming out of the spout high pressure or can you hold your finger over it and stop the flow? If you can stop the flow, you have a bad water pump impeller. If not... you are probably getting good water pressure. If your oil tank is full, the low level sensor is dirty or bad..this will cause the alarm..Fix each of these and repost.

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Just had the same issue with my 92 mercury 2 stroke outboard. It could be the oil sensor temp sensor or the moduel for the 2.

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1 Answer

2000 mercury 225 outboard engine

There is a float in the reservoir and this is what causes the problem. There is a YouTube video which shows how to test. In the video the problem was the sensor and replacing the reservoir for a new one solved the problem.

This is the video, I found it.

Mercury Oil Tank Level Sensor 4 Beeps Every 2 Minutes

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1 Answer

I have an early 80's model mercury outboard 70 hp. When I start the engine the low oil buzzer for the two stroke oil goes off. But the tank is full. How do I fix this problem ? Thanks

if the tank is full of oil but the alarm activates , I would start at the level indicator as being faulty
normally it is like a small float on the oil ( broken off ,full of oil and sunk) or a series resistance that activates when there is no oil to close the circuit off
Test by removing it and placing it in a jar of oil or moving the level manually to see if the alarm cuts in/out after that
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1 Answer

Water got into the engine oil of my 8 hp 4 stroke when on the boat only as troller

Water gets in your engine through the exhaust with the boat speed! Lift that engine when not in use!

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2 Answers

I have a Mercury 90 hp outboard and the alarm is beeping. I added oil and the water outlet is running properly. How can I shut the beeper off? What's wrong? Larry

Hi, follow the wires from the bottom of the oil reservoir and unplug them at the connection. If the alarm stops then the sensor or built in float is faulty. Replace the sensor first, if this solves the problem no more action is required. If it still alarms you will need to replace the reservoir as well, as the float is not removable. Hope this helps, regards Phil.

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