88 xr4 oil injection question

[mike88xr4150]

On my Merc 150 injector gear on the crank failed, as luck would have it it failed while running it in the driveway. My question is after pulling the pump shaft and removing the bushing, why cant I put the pump back on and leave all the rest of the components on the engine and premix? I did have alot of plastic shavings on the pump shaft. And also how do I silence the oil warning alarm? This forum has already saved me a lot of time and money ,and I am very thankful. ML.

 

[CharlieB]

Re: 88 xr4 oil injection question

The oil alarm compares the pulses of the rotation sensor on the oil pump to the ignition pulses on the green wire between the alarm and (usually) #4 coil.

Disconnect the green wire from the coil, leaving the other green wire on the coil from the switchbox, otherwise you will kill the spark on #4.

Disconnect the rotation sensor wires.

NEVER FORGET TO PRE-MIX YOUR FUEL!!!!!!

Remove the mixing fitting (oil/fuel) replace the fuel line with a single length.

 

[j_martin]

Re: 88 xr4 oil injection question

Take it all completely off. The oil alert module only deals with oil, so it's completely unneeded if the oil pump is disabled or removed.

Here's the formal instructions.

Re: oil injection removal Merc V6 only

You need part number 43453 if it is available. That retains the pump driveshaft bushing and plugs the hole where the pump mounts. Then remove the oil components and the warning module. You'll also need to remove the fitting that the oil tank pressure hose attaches to and plug the hole in the block.

Order three stickers (37-818029 1), one to mount near the fuel fitting on the motor, one for the dash, and one near the fuel fill fitting on the boat. They'll alert the operator that the gas needs to have oil added. One frequent problem we see here regards the infamous "brother-in-law" that forgets to add oil to the gas and roaches the motor.

You should probably replace the fuel lines where the fitting for the oil T's into the fuel line with a single piece of fuel line.

hope it helps
john

 

[mike88xr4150]

Re: 88 xr4 oil injection question

Thanks for the info. I am going to have a rebuild later. And the way the economy is,it may need to survive a couple of seasons. But as always, I get trusted info for my boat.

 

[j_martin]

Re: 88 xr4 oil injection question

Point of Interest:
Some of the original outer shaft bushings would swell up and bind the shaft, shredding the gear. It's worth it to replace it with a new one that won't do that. The other thing that tends to shred em is overheat. Otherwise, at under 6500 rpm, they are probably more reliable than the average boater remembering to mix oil in the fuel.