I just repowered my boat to a 1998 Mercury 115hp, My question is how reliable is the oil injection system on these motors, Or should i eliminate the oil injection and go 50:1 premix?
Not sure, I've never had my oil pump down that far. Mine tested good at 25ml in 15 min at idle.Do you know if Mercury kept the same plastic impeller as previous years, or have they upgraded to a aluminum one.
The drive gear on the crankshaft is nylon. They will last forever unless you seriously overheat the engine, or get so much snot in the oil that the pump jams.
The oil injection is quite reliable, but it takes a little bit of operator awareness to keep it reliable.
When you turn on the key, you should get a series of beeps. That's the power on self test for the oil alert module. If you don't hear it, you aren't protected.
If the oil alert does sound the alarm, deal with it. It means trouble, sometimes real trouble, sometimes failed control parts, but it means trouble. You see posts here all the time. "keeps beeping, driving me crazy."When the engine freezes, it'll be the VRO's fault of course.
I beat the snot out of my XR4 all the time, so I run about an ounce of oil per gallon in the fuel tank, plus the oil injection. That gives me about 60:1 at idle, and 40:1 at WOT. It also gives me a few seconds of insurance if the oil pump should fail. One day the oil alert module gave up the ghost about 15 miles out on the Whitefish chain. I dumped the spare quart of oil I had on board into the 22 gallons of fuel I had on board, and kept fishing. I ran back at 1/2 throttle in the end, troubleshot the module, replaced it, topped off the gas tank, and went back to fishing. No harm done except a little smoke.
hope it helps
John
The drive gear on the crankshaft is nylon. They will last forever unless you seriously overheat the engine, or get so much snot in the oil that the pump jams.
The oil injection is quite reliable, but it takes a little bit of operator awareness to keep it reliable.
When you turn on the key, you should get a series of beeps. That's the power on self test for the oil alert module. If you don't hear it, you aren't protected.
If the oil alert does sound the alarm, deal with it. It means trouble, sometimes real trouble, sometimes failed control parts, but it means trouble. You see posts here all the time. "keeps beeping, driving me crazy."When the engine freezes, it'll be the VRO's fault of course.
I beat the snot out of my XR4 all the time, so I run about an ounce of oil per gallon in the fuel tank, plus the oil injection. That gives me about 60:1 at idle, and 40:1 at WOT. It also gives me a few seconds of insurance if the oil pump should fail. One day the oil alert module gave up the ghost about 15 miles out on the Whitefish chain. I dumped the spare quart of oil I had on board into the 22 gallons of fuel I had on board, and kept fishing. I ran back at 1/2 throttle in the end, troubleshot the module, replaced it, topped off the gas tank, and went back to fishing. No harm done except a little smoke.
hope it helps
John