excessive smoke from XR6

[smokin gun]

I just ran my boat for the first time after the winter months.

There was excessive blue smoke while running, really bad when idling. When I got it out of the water I noticed milky oil in both the prop shaft and the exhaust port (what i think is an exhaust port) located in the back under the water pump indicator hole.

This unit has a remote oil reservior that I recently removed and put back in. There are two lines running from this remote oil reservoir and I'm not sure if I put them on correctly. If I got them backwards would it cause this excessive smoke and milky oil.

Also, the motor seem to run fine but at full throttle I could only max out at 43 mph where normally I can hit 50 mph.

Any help would be appreciated

 

[j_martin]

Re: excessive smoke from XR6

Yer dropping a cylinder. The excess smoke is unburned fuel burning in the exhaust, as is the excess oily stuff in the prop (exhaust) path.

Why is another question. Quick check the spark, then check compression, and so forth.

hope it helps
John

 

[smokin gun]

Re: excessive smoke from XR6

Thanks John. If it's one of the spark plugs not firing shouldn't I find oil when I take it out.

Could the fix be as easy as changing that one spark plug?

I have no idea how to check compression so if it's more complicated than spark plug I will have to take it in I guess.

 

[j_martin]

Re: excessive smoke from XR6

They're all oily. The clean one (clean oil) is the one misfiring.

 

[hkeiner]

Re: excessive smoke from XR6

I have no idea how to check compression so if it's more complicated than spark plug I will have to take it in I guess.

Checking the compression on a motor is very easy. I would think easier than the effort of taking the boat/motor to a shop and then returning later to pick it up. It also might be cheaper than the cost to have it done at a shop. All you need is a compresson gauge, which can be purchased at most any automotive parts store. Below is a link to some past threads on the subject, which might provide enough info for you to want to give it a try yourself.

An in-line spark tester is also a cheap but usefull tool for checking the spark on each cylinder.

Good luck,

http://www.outboardrepairs.com/compression/

 

[smokin gun]

Re: excessive smoke from XR6

Well I found something wrong with the motor but I'm not sure it was the only thing going on. The two lines running from the remote oil reservoir to the motor were hooked up backwards. One of the lines comes off of the motor and supplies pressure to the reservoir to push the oil out the other line. The line that supplies oil to the motor runs into the internal oil reservoir. Yes I know...I'm an idiot.

Anyway, beacause the tank was pressured up and left that way for a week oil was squeezed through the line that normally supplies the pressure. Somehow the oil went out through the exhaust around the prop and made one mell of a hess. I of course released the pressure on the remote reservoir (that's how I found out it had pressure to begin with.

My question to you guys, can I simply put the lines to the remote reservoir back on correctly and run the motor or do I need to do something special.

I still may have dropped a cylinder as well but I'll work on that later. I could tell nothing by taking the plugs out.

I'm not totally sure that those oil lines being reversed is what caused the excessive smoke either. Since only one of the lines drop down into the reservoir I'm don't know how oil would have come out the other. I'm pretty sure that the line that pressured up the reservoir is the same one that had oil squeezed back into it once the motor was stopped.

As always...any help would be appreciated.

 

[gss036]

Re: excessive smoke from XR6

Hook the lines up correctly and then slightly loosen the cap for the tank on the motor, this will allow oil to overflow at the cap. Retighten it, just enough to keep it from seeping oil. Then check the main oil tank on the baoat after a few minutes to see if it relieves the pressure. If it doesn't, then you need to replace the check valve on the lower starboard side of the engine and retest.
There is another check valve that keeps the fuel and oil seperated until it is time for them to mix inroute to the carbs. Check all the clear hoses to make sure they are not brittle and cracking, if so, replace them.
Maybe even rebuild the fuel pump in case the diphram has ruptured.

 

[j_martin]

Re: excessive smoke from XR6

flooding #6 crankcase with oil would probably drop a cylinder. You might have caused some piston or bearing damage due to lack of oil in the fuel in the other cylinders.

If the engine tank didn't go dry, and some oil was used, it's probably OK.

hope it helps
John