Yamaha PRO V 150 Excessive Blue Smoke

[jwharp]

Got a 1987 Yamaha 150hp ProV v6, engine running rough ... seems to be getting too much oil ... propellor trail behind boat is a blue cloud ... oil is dripping from 4 of 6 carb ports, main oil tank on engine is full, any ideas as to what is wrong?

 

[rodbolt]

Re: Yamaha PRO V 150 Excessive Blue Smoke

sounds like the oil controler or engine tank switch failed and the oil transfer pump is not turning off correctly and the excess oil is filling up the airbox. or your link rod clip is broken and the oil pump arm is at wide open.<br /> good luck and keep posting

 

[jwharp]

Re: Yamaha PRO V 150 Excessive Blue Smoke

Your right the oil transfer pump is not turning off ... I now better understand what is happening.<br /><br />Removed the carburetor air box cover to expose the carb throats.<br /><br />Turned ignition switch ON ... Oil-feed pump (on Boat Oil Tank) starts, runs continually and overfills the Engine Oil Tank... the oil is forced into the overflow tube and seeps from a weep hole to the right of the top carb throats. also oil seeps from a very small weep hole at the very bottom right of the lower carb throats ... this tube comes from the engine block (lower left-side).<br /><br />I'm guessing as the Engine Oil Tank overfills, pressure inside increases forcing oil down the supply tube to the Oil-injector pump which in turn forces oil through the six oil-injectors in the engine block, flooding the engine with oil.<br /><br />I'm guessing the Oil-level sensor on the Engine Oil Tank is failing (I assume this sensor's functions are to switch-off the Oil-feed pump and to alert of a low oil supply condition ... is this right?).<br /><br />Do you think I'm on the right track? Is there anyway to test the Oil-level sensor or should I just go buy a replacement?

 

[Ray Neudecker]

Re: Yamaha PRO V 150 Excessive Blue Smoke

I have seen more failures from the module than the sensor. Some times when you remove it the problem is obvious looking at the rear of it. It will be swollen and discolored. Test the sensor with an ohm meter.

 

[jwharp]

Re: Yamaha PRO V 150 Excessive Blue Smoke

Sorry guys, I'm confused! I'm a rooky at this but I can fix it with direction. Let's restart.<br /><br />Rodbolt ... You say, Engine Tank Switch??? is this what Yamaha labels "Emergency Switch" mounted on a black box to the right of the Engine Oil Tank? you say, Oil Controller ... where is this located?<br /><br />Ray Neudecker ... Module ... where is this located?<br /><br />I tested the Sensor with Ohm meter ... when float is at the top ... Black to White the switch is closed, any float level below the top, the switch is open. Black to Brown the switch is closed when float is positioned 1/3 to 1/2 from the bottom, float position above 1/2 and below 1/3 switch is open. Black to Red I don't get a reading. Do you think the sensor is working right?

 

[Ray Neudecker]

Re: Yamaha PRO V 150 Excessive Blue Smoke

It would appear the sensor is working correctly and the module which is the unit with the emergency switch is defective. This is also called the oil controller. Its primary function is to turn on the oil pump to refill the engine mounted tank either from the signal from the tank sensor or manually with the switch. Hope this helps.

 

[jwharp]

Re: Yamaha PRO V 150 Excessive Blue Smoke

My new Oil Controller arrived today. I was expecting 'one' part but got a kit 6E5-WS857-00 [Oil Controller, 2 lead extensions (for Pulser coil connection), 6 Resistor spark plug caps, 2 lead holders and 6 plastic ties].<br /><br />New Oil Controller is 'similar' but has an 8th wire on the 7 wire plug side ... this 8th wire is intended to be connected to the Pulser Coil ... why??? an engineering change maybe??? Two install options are supplied for connecting to the pulser coil. Option 1 (6N7, 6E5) is to disconnect the pulser coil lead coupler and insert a new harness (supplied). Option 2 (6E5, 6G5) is to run a new lead (supplied) to a terminal in the CDI.<br /><br />Next step is to remove the 'old' spark plug caps and replace with new Resistor spark plug caps ... why???<br /><br />My questions: Did I get the correct part(s)? If so, can I ignore the 8th wire? or do I have to install 'all' the parts (to the pulser coil and spark plug caps)?<br /><br />Info from the transom mounting bracket: ProV 150 H, 6J9 L 302752. I purchased new in 1987. The original Oil Controller has 6E5-01, 664 printed in white (no other part numbers can be found). The new Oil controller has 6N7-09, 37G printed in white.<br /><br />Your help would be appreciated so I can get back out on the water.

 

[jwharp]

Re: Yamaha PRO V 150 Excessive Blue Smoke

Ray or Rodbolt, I'm dealing with a parts guy at my Yamaha dealer. Not sure he understands what he is ordering. I searched the parts catalog at www.boats.net ... looks like the parts I got are a substitution. Do you have any idea if I install the new oil controller and ignore the 8th wire if that will be a problem (refer to my earlier message). The manual Yamaha sent with the parts does not address this condition.

 

[Ray Neudecker]

Re: Yamaha PRO V 150 Excessive Blue Smoke

I haven't seen the conversion kit yet, but since the failure rate was fairly high (for Yamaha Electrics) I assume that it is an engineering update. I would use the 8th wire as directed and install the plug caps. They are obviously intended to keep rf out of the module.

 

[rodbolt]

Re: Yamaha PRO V 150 Excessive Blue Smoke

shhhh dont tell but a quick easy test is to disconnect the engine oil tank seneder. is a jumper wire with the key on. jump the engine side of the connector black to brown and the pump should turn on, jump black to white and the pump should turn off jump black to red and the alarm horn should sound. on your black to red ohms test you should get continuity with the float down. if the pump does not turn off when jumping white to black there is a good chance the control module is bad. some where around this site there is a detailed trouble shooting guide. try to find it.<br /> good luck and keep posting

 

[jwharp]

Re: Yamaha PRO V 150 Excessive Blue Smoke

Did the search and found the site with the detailed trouble shooting guide. For your reference:<br /><br />www.bassandwalleyeboats.com/site page 897/article page 98.html<br /><br />Thanks for your help. I will test on the weekend.

 

[jwharp]

Re: Yamaha PRO V 150 Excessive Blue Smoke

Ray and Rodbolt thanks for your help! This is a great service! The new oil controller is installed and works. I returned the Oil Controller with the 8th wire. The replacement Oil controller is identical to the original part and is part # 6E5-85740-02 should anyone find Yamaha supplys them one with an 8th wire. Thanks again for the help!