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1995 115 MercuryYamaha Oiling System Disconnect

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bobbyc

Advanced Contributor
"I am wondering if anyone has

"I am wondering if anyone has any thoughts or experience as to disconnecting the automatic oiler on a 4 cylinder 1995 Mercury. I have read some opinions in the archives but I am not sure of the pros and cons. My understanding of these systems is that the engine runs at 50 to 1 at full throttle and maybe 100 to 1 at Idle. I know there is a low oil sensor in the tank(and that it is often prone to fail and send a false signal) I don't think there is anything to warn of a defective pump or decreased volume and that concerns me. Has anyone made the changeover to 50 to 1 pre-mixing and disconnecting the pump. Does anyone have any thoughts on this? Are the plugs going to foul and will the smoke level increase noticeably? Are there any other negative consequences. Running this engine in a barrel, I am impressed with the lack of oil residue but at the same time I don't need any expensive surprises. If anyone has made this changeover I would appreciate hearing your thoughts. Thanks, Bob"
 
"Bob, first off I would share

"Bob, first off I would share your concern. Yes, it will alarm if either the sensor goes or it gets down below about a quart of oil (low oil alarm).

But you are right, there is nothing that will alarm if the pump gives up on you.

I have never been a big fan of the oil injection systems, old or new for that very reason. I just don't see what the big hassle is in mixing my gas (which I do).

The system is however, a little more effient. It mixes at about 80:1 at idle and then 50:1 at WOT.

Numerous owners have ripped out the oil system, blocked the line going into the fuel pump and switched to pre-mix with no real noticable effect. Perhaps a little more smoke (maybe) but have never really heard of fouling because of the switch.

It's a good practice to change the plugs anually anyhow - it's only 4 plugs at a couple bucks a piece.

I'm not a big proponent of ripping out something that works, but in the case of the oil system, on a motor that is now pushing 13 (model) years old, I may be tempted...."
 
"Graham, Thanks so much for yo

"Graham, Thanks so much for your insights on this change over...The age of the motor is a factor, as is the piece of mind knowing that by premixing, I am not depending on a 13 year old oiling system. The question now is...what is the best way to disconnect the pump. It would seem that just pulling the hoses and leaving the pump in place might cause the pump to sieze. Using an oil filled hose connected from the inlet to the outlet might work but I am not sure if the oil would stay in place over time. The service manual does not show the internals of the pump and before I remove it, I would like to know the best way to do so without creating problems...Thanks, Bob"
 
"Bob, this is a gear driven oi

"Bob, this is a gear driven oil pump set-up. I would remove the drive gear for sure. You could leave everything else (or put it back) so that the system is pretty much intact - but I would still plug the (feed) to the fuel pump.

Alternately, you could simply remove everything...."
 
"This gear never goes bad on t

"This gear never goes bad on the in-line engine. The 13 year old hoses should be replaced A.S.A.P. That is were the trouble was on all Merc's.

The hassle is when you have 100 gallons of gas. The next hassle is the phase seperation if running on E-10, will bury you if the mix gas pulls apart from the alcohol/ water mix. Pick your posion."
 
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