what does the cdi control other than the oil level

[edgebaits]

I have been told my cdi is bad since my oil pump will not stop running once the oil reservoir on the motor is full, it continues to fill it to the point it bleeds the excess into the air box. I want to disconnect the oil system and mix the oil myself until I can swing the 700+ its going to cost to replace the cdi. I want to know if anything else is at risk with an obviously faulty cdi. The motor runs fine with the exception of continually fowling plugs due to the over oiling. My other option is to put a manual switch on the power going to the pump and I will control when it comes on and off.

Any advise other than the obvious of spending the money???

[Sigma]

I am no expert but I really dont thinkl it's the cdi. That makes no since the oil pump is gear driven and draws the oil from the tank.

sounds like a check valve or possible bad pump but not the cdi??????


have you checked the caps on the oil tanks and made sure the vents ore not clogged? it could be building pressure and forcing the oil through? It's a wag but just trying to help.

[PSM207]

What model and year engine?

[edgebaits]

Sorry about that...Its a 1998 175vmax
There are 2 tanks for this system. The one in the boat has a pump that is controlled by the cdi and pumps oil up to the reservoir. There it is gravity
feed to the carbs. The pump in the large tank is the one not shutting off. It is over filling the Small reservoir and forcing oil through the pump and out the puke hose that leads to the breather box.

[Sigma]

Have you checked out the sender or float for the main tank? I would think if it were filling the smaller motor tank that full it would push the cap off the motor tank first.

The float on the motor tank could be bad as well, that would cause the main tank to try and keep filling the smaller tank.

[PSM207]

Post this question for BBC member "hamfisted". He's the man on Yam tech questions.

[edgebaits]

The way this system works is, a guage in the small tank tells the main tank when to come on and off. 2 marks on the tank show where low and full are. if the small tank runs even lower it sounds the warning buzzer and kills the motor. The only thing the the big tank does is store and pump oil to the little tank on the motor. Yes it does have a guage in it, but it doesn't control any oil flow to the motor. Just a slave to the little one. And yes it has pushed the cap off a few times.
My biggest concern is it over oils the motor. That thing on the side of the motor with all the hoses on it is not an oil pump like most people think it is. It controls how much oil is allowed to gravity feed through it as to not over oil the motor.
If the oil coming into this control thing (sorry I don't know what they call it) is under pressure it could force more oil through it. this is where my problem is. If the motor doesn't turn off it through the whole system out of whack. So I really want to know if the cdi does anymore than controlling the oil system?

[Sigma]

Read this thread, sounds like the same problem. You might want to try a few things listed there and follow the thread and see what the fix was.

http://www.bbcboards.net...85994

[edgebaits]

Does anybody know what else the cdi does other than contol the oil system??????

[Sigma]

Ok to answer you question since you seem to think you have the oil system down to a science here it is. The CDI is the computer controlled digital ignition system. It controls the ignition, stator/pulse coil/plugs and the charging system in conjunction with the regulator rectifier and several other functions.

In my opinion it does not control the oiling, it is connected to the sensors for the tanks but only reads what the sensor tells it, if the sensor is stuck or defective it will give false signals to the CDI not the other Way around.

I would get a different mechanic before you waist $700.00

Good luck and please let us know what fixes it and how much it cost you.


Modified by abu-guru at 11:30 AM 5/11/2007


Modified by abu-guru at 1:05 PM 5/11/2007

[Bass Junkie]

I agree, it sounds like the sensor in the motor mounted tank is bad or the float is stuck. Thus it keeps sending signals to pump oil from the big tank to the motor mounted tank and is over filling it.

[Sigma]

[macinckirk]

I had somewhat the same problum last year with my motor, What would happen would be that the float got stick Wide Open and would just keep pumping oil to the tank on the motor, it would blow the top off and would pump the res 3 gal tank down. It sounds to me that yours is stuck open but not all the way and that way its pumping more oil then needed but not to the point ( like mine) to blow the top off your tank at the motor.

It was the Oil level part # 67h857300100 Not sure about your # but the cost was $130.36 plus tax and shiping

30 min job to fix

Just a Idea

[BuzzB8]

$130??? Hell, it's only gone up by $15 since 1990.

Do a search on here for oil sensors, I think there was once a post on how to clean the thing. Wouldn't hurt to try it.

[BuzzB8]

Hmmm, on the parts page, it's called an OIL PUMP.

[Hamfisted]

Chris if you unplug the sensor for the primary tank (the one under the hood...) does the oil stop pumping?
But as everyone else has said, I seriously doubt it's your CDI. You may even have a wire shorting out to ground, that would turn the pump on too.
Try a different mechanic. Or post your email and I'll send you a service manual to read.


-Mike

[JUST-IN-TIME]

i have the dealer training troubleshooting guide
shoot me an e-mail