1996 Mercury 100 HP Oil Injection

[bmartin]

Hi, I have recently purchased this motor and have heard of people disconnecting the oil pump and just mixing the gas. My question is, do these pumps fail often? And if they do fail is there some kind of warning besides the eventual blow up? Thanks.

 

[fastback4]

Re: 1996 Mercury 100 HP Oil Injection

I believe the "low oil warning buzzer or light" will alert you that some 2 cycle oil is needed in the oil reservoir tank. Always top off the oil before the boat comes off the trailor. The engine "HOT" alert light or the buzzer will sound if the engine gets hot and that's to close for comfort in my opinion. I suggest you purchase a shop repair manual for your motor and know your motors components to better understand how it works. My manual shows how to test your engines alarms to see if they actually work.
Best of luck my friend.....

 

[bmartin]

Re: 1996 Mercury 100 HP Oil Injection

Thanks for the response, I'm working on getting a manual.

 

[rodbolt]

Re: 1996 Mercury 100 HP Oil Injection

never saw an oil pump or drive gear failure on that engine.
most failures involved customer inaction.
the low tank level alarm was and is iffy at best, lots of false alarms and the occasional no alarm and the customer ran it smooth out of oil.
the other problem was the vynil oil lines get hard over time and break leading to a loss of engine lubrication.
both problems are incredibly easy to fix.
first top off the oil tank before using, that tank holds enough oil for about 100 gallons of fuel at WOT.
second periodically replace your oil lines.
in any case grab them and twist and tug, if they break they were due for replacement anyway.
the last is periodically rebuild your fuel pump as this is where the mixing takes place and can prevent lean outs at high speeds anyway.
its all simple maint that can be done in the driveway for little expense.
fail to do it and it cant be fixed in the yard and can get very costly.