mercury 150 xr6 need help

[denjer]

Little History First
I have had my boat now for 3 weeks, to the best of my knowledge it is a 1993-1996 Mercury 150 xr6. Until I purchased the boat I know it has been sitting up for at least four years. The day I bought it I put fresh gas to it and a hot battery and have been fishing every weekend since.

Questions and Problems.
1. Today I left to go fishing and only ran the boat at 1/2 throttle for about 4 miles and it did fine. Went to come back and went to open the boat up and the boat would never take off. It acts as if it is running on part of the cylinders. I stop and fished a little longer and tried again and this time i started getting a beep beep beep and it still would not take off.

a. the boat will idle good, and in nuetral it revs up fine,
Actually when i Rev the engine up in neutral the beep beep goes away,
b. I have no temp gauge to see but no apparent reason to think it got hot.
c. The oil level for the fuel is full, I have check to make sure there is no air in the oil jug causing the beep beep.
d. I have check removed both thermostates and check the water pump, water pump good.
e. Now I am at home, with water hooked up to it I turn key on and get the normal beep and then when i crank it, the beep starts instantly at idle. The engine is smoking as if it is oiling.
f. I read on the forums where a module will cause this, I want to know what they are calling a module and how this will make the beep we are getting.
G. What type of water pressure should i have with it idleing and with the engine rev up.

If anyone can help please do, I Dont mind spending money on the parts, I just dont want the down time i would get from a Local Marine shop.

THanks

 

[j_martin]

Re: mercury 150 xr6 need help

Sounds like your engine needs a thorough going over, which is not beyond the shade tree mechanic. You need a shop manual for your engine. It will have all the procedures in it.

It is possible you overheated if you did not replace the water pump impellor. They will take a set in a year or so and not pump efficiently.

You may also have fouled plugs, a plugged up carb or 2, or a more serious ignition issue.

If you run it crippled, it is pretty easy to burn it down and make it worthless. I wouldn't do that. Well maintained, it'll outlast you.

The oil alert module is probably working properly if it beeps a few times when you turn on the key. It gets a string of pulses from a sensor in the oil pump, and another string of pulses from the ignition system. If either string is missing, it'll beep incessantly. Odds are you have an ignition problem that affects the cylinder which supplies that pulse train to the oil alert module.

If it were mine, I'd get the book, a DVA, a compression tester, and check it out, starting with checking the compression to be sure you haven't hurt it so far.

hope it helps
John

 

[denjer]

Re: mercury 150 xr6 need help

Thank you Martin, Just today I ran a compression check, all cylinders are from 119 to 121 compression, I got a Water pump today and installed but i am having trouble stabbing the foot so far. I have purchased plugs and installed to day but due to the foot not going in as plan i have not got to start it just yet. I still have the beep beep. Even turning the engine over to check the compression I get the beep beep when key turns on and after turning the engine over to check compression it will start to beep beep and will not stop till i turn key off. The local boat shop told me it was possible one of the three oil sensor but wants me to bring it in to get it check. I really wish I knew how to check them due to the fact I would like to have it this weekend. I would truly like to know if the beep beep and the sluggish power is one of the same problem. They didnt start at the exact time but did start in the same trip. What gets me it idles like a dream and engine will rev up as normal in nuetral and when you do rev up the beep beep goes away.

I really appreciate your help and will get a manuel soon. If you have any ideals on where to start please send them. Just the oil cap for the engine at the shop is 68.00 and i can only imagine what the rest of the sensor cost.

 

[j_martin]

Re: mercury 150 xr6 need help

I would suspect that you have a low speed miss on the cylinder that the oil alert samples to see if the engine is running. Fix the miss, and I believe the oil alarm will not sound.

If the oil cap sensor were bad, disconnecting it would stop the alarm, and the alarm would come on with the key and stay on.

From what you say, I would guess that one of the low speed charge coils in the stator is defective. It would easily be found with a DVA. Either get the testing done somehow, or throw a lot of money and time at the problem.

hope it helps
John

 

[boatmonkey82]

Re: mercury 150 xr6 need help

i have had a few with the oil tank sensor will stick in the low oil position , while it is beeping unhook the blue wires coming out of the tank , if the beeping stops then its prob the float sensor , if it still on then follow the blues wires down to your warning mod and find a tan wire , unhook it , if it stops then , then your either overheating or the heat sensor is bad or grounded, i think the beep beep is oil warning and the solid beep is over heat , if both of those test fail then unhook the black with yellow trace from the warn mod and see if it returns to speed . if it is none of those things then its prob one power pack is out and its only running on half the motor . common prob for those older mercs, if its a power pack then i recomend getting both at the same time since the other may not be far behind

 

[denjer]

Re: mercury 150 xr6 need help

Thank everyone for there help, I am new to this site and have learned alot but i have a few questions that I am sure are going to sound elementry to all of you. I would not ever call myself a boat mechanic but have been turning wrenches all my life. I am probely the best parts changer around. Here we go.

a. what exactly is a DVA tester, and where can i get one? Is it a volt meter?
b. What is the correct name for the power pack? Looking it up online I get nothing.
c. What is the stator and where is it located at on the engine.
d. How can i tell what cylinder the oil alert gets it info to tell the warning module the engine is running? What wire goes were so I can trace that wire to possilbe my problem.

I am going now to unplug wires has boat monkey suggested, I will let you know when i have the results. By the way for those who have been keeping up with my troubles. The reason my foot wouldnt stab is there is bushing right before it went into the engine that moved. I slide it back into place and it went right in as it should.

 

[j_martin]

Re: mercury 150 xr6 need help

Thank everyone for there help, I am new to this site and have learned alot but i have a few questions that I am sure are going to sound elementry to all of you. I would not ever call myself a boat mechanic but have been turning wrenches all my life. I am probely the best parts changer around. Here we go.

a. what exactly is a DVA tester, and where can i get one? Is it a volt meter?
b. What is the correct name for the power pack? Looking it up online I get nothing.
c. What is the stator and where is it located at on the engine.
d. How can i tell what cylinder the oil alert gets it info to tell the warning module the engine is running? What wire goes were so I can trace that wire to possilbe my problem.

I am going now to unplug wires has boat monkey suggested, I will let you know when i have the results. By the way for those who have been keeping up with my troubles. The reason my foot wouldnt stab is there is bushing right before it went into the engine that moved. I slide it back into place and it went right in as it should.

a. DVA is a direct voltage adapter. It converts AC to peak reading dc voltage. You can buy an adapter for an ordinary multimeter, or make one from a diode and a capacitor.

b. Switchbox

c. It is the iron core and coils assembly that is under the flywheel. Wires come from it to the switchboxes (4) and to the rectifier (2 yellow) or voltage regulator(s) (2 or 4 yellow)

another assembly under the flywheel is the trigger. It has 6 wires all going to the switchboxes.

d. The green wire from the oil alert module on the starboard side goes to one of the spark coil drive connections (usually #2). If you move it to a known good cylinder, I would bet the alarm will quit going off.

BTW, if the sensor in the cap were bad, the alarm would go off on key on and not quit.

hope it helps. Good questions, by the way.

John