Merc 240EFI running in oil mix ratio

[busterthejetboater]

Hi All

I will be firing up my 2nd gen Merc 240EFI soon after complete rebuild. It has the electric oil pump but I am going to bypass it into a bottle initially to verify operation.

What oil mix ratio must I use to run the motor in, and for how long?

Thanks

 

[Lumps]

the manual for 2000 240 efi says:
"Engines with oil injection must be run on a fuel mixture of 50:1 for the first 30 gallons
of fuel. Refer to engine break-in procedure in the Operation and Maintenance
Manual."

but this is assuming you still have the normal oil injection turned on.

later on in the manual it says:

Gasoline/Oil Ratio 50:1 (25:1 Break-In)

anyway, you'd probably want to have some one else verify this. I am just looking at the manual and it doesn't really specifically say "if you are running only on premix..."

 

[Dr Honda]

Yep... if you are going to unplug your oil pump... and the engine is fresh... then you need 25:1 in the tank. Just be aware... there will be a lot of smoke doing that.

Now... as far as pulling the pump to check it's operation... it is variable, so it's not going to be a perfect test. (collecting the oil, and checking used fuel)

I've personally never heard about one of the electric pumps failing.