O5 Tige Vortex 5.7 Question.

[chpthril]

This is from the Mercruiser service manual:
Power Package Layup

1. Fill fuel tanks with fresh gasoline that does not contain alchohol and a sufficient ammount of Quicksilver Gasoline Stabilizer for marine engines to treat gasoline. Follow instructions on container.

2. If boat is to be placed in storage with fuel containing alchohol in fuel tanks (if fuel without alchohol is unavailable): Fuel tanks should be drained as low as possible and Quicksilver Gasoline Stabilizer for marine engines added to any fuel remaining in the tank. Refer to "Fuel Requirements" for additional information.

NOTE If desired, a portable fuel tank can be used to perform the remainder of the power package layup procedures. Be sure to add an appropriate amount of Gasoline Stabilizer to the portable tank.

3. Run engine sufficiently to bring it up to normal operating temperature and allow fuel with Quicksilver Gasoline Stabilizer to circulate through fuel system.

4. Shut off engine.

5. Change oil and oil filter.

6. Flush cooling system. Refer to "Flushing Cooling System" procedure.

7. Close fuel shutoff valve, if equipped. If no fuel shutoff valve is present, a suitable method must be employed to STOP the flow of fuel from the fuel tank to the engine before proceeding.

8. Prepare EFI fuel system fo extended storage as follows:
a. Allow engine to cool down
b. Remove the water separating fuel filter
c. Pour out a small amount of fuel into a suitable container, then add approximately 2 fluid ounces of Quicksilver 2-Cycle outboard Oil to fuel in the water separating fuel filter.
d. Reinstall water separating fuel filter.
e. Start and operate engine at idle speed until the water separating fuel filter and fuel injection sustem are emty and engine stops.
f. Remove and discard water separating fuel filter.
g. Install new filter.

9. Prepare [COLOR="black"]CARBURETED fuel system for extended storage as follows:
a. REmove flame arrestor assembly and start engine.
b. While operating engine at fast idle (1000-1500rpm), fog insternal surfaces of induction system and combustion chambers by squirting approximately 8 ounces of Quicksilver Storage Seal or SAE 20W engine oil into carburetor bores.
c. Squirt the remaining 2 ounces of Storage Seal rapidly into carburetor, just as the engine begins to stall, due to lack of fuel. Allow engine to stop.
d. Turn ignition key to OFF position.
e. Refer to "Flushing Cooling System" and appropriatelyt remove water supply to the seawater pickup pump.


Just making sure none of you are incorrectly informed as to what we as Mercruiser techs have access to in the manuals. Good luck!

Sorry, but it seems the part about not fogging engine and why, got cut off. Could you re-post where Merc warns against fogging and why they say not to? I would also like to hear your thoughts, as a technician, as to why and how fogging will damage injectors. As noted above, this has been discussed before, but there is no argument from any of the manufacturers as to why this should not be done.

Also, the OP's engine may be a Marine Power, do you also have info from their manuals on the subject of fogging? Thanks.

[boatwakes]

There is nothing in the manual that says "don't fog an MPI motor". However, the guidelines for extended layup on an MPI (Mercruiser specific in this case) are clear and they do not include fogging. I've changed injectors, most cases it's only one and they've always been closest to the intake, on engines that get fogged because the pintle needle sticks open and washes down the cylinder(s). I've also seen a rising occurence of this since ethanol was introduced into gasoline but injector failure is a very rare problem compared to most other engine issues. Air temp sensors and map sensors get coated with fogging oil and cause incorrect, within range readings. Had a new customer who, after recomissioning on his own following fogging, had his manifold air temp sensor read the incoming air temp at 45* when it was 104* outside. He was on the water and needed a fix to save the weekend as the engine was overfueling at idle and stalling out when throttled up. We removed, saw buildup of "goo", cleaned with some carb cleaner, reinstalled and saw normal readings. After that weekend we installed a new sensor anyway but note should be taken of the circumstances leading up to and following the incident.
But back to fogging. Again, ALL PORT FUEL INJECTED ENGINES should follow the above guidelines, Marine Power or Mercruiser. Their injectors are the same, their sensors are the same, etc... Throttle body and carb motors, fog away 'cause thats what the manual says to do.
I hope this helps clear up any mystery. Again, good luck!

[flyboy]

I have a Marine Power...and I'm a bit more confused now than when I originally posted..but I do appreciate the dialog.

[ajholt7]

I fog mine and I will keep fogging it. I have never had a problem. I would rather end up with gummed up parts than rusted cylinders.

[flyboy]

2. If boat is to be placed in storage with fuel containing alchohol in fuel tanks (if fuel without alchohol is unavailable): Fuel tanks should be drained as low as possible and Quicksilver Gasoline Stabilizer for marine engines added to any fuel remaining in the tank. Refer to "Fuel Requirements" for additional information.



OK, we have ethanol here in NY. I have always topped off the tank and added stabil...This is the first I'm hearing of leaving the tank as empty as possible if ethanol is the only available fuel.

[chpthril]

2. If boat is to be placed in storage with fuel containing alchohol in fuel tanks (if fuel without alchohol is unavailable): Fuel tanks should be drained as low as possible and Quicksilver Gasoline Stabilizer for marine engines added to any fuel remaining in the tank. Refer to "Fuel Requirements" for additional information.



OK, we have ethanol here in NY. I have always topped off the tank and added stabil...This is the first I'm hearing of leaving the tank as empty as possible if ethanol is the only available fuel.

Sta-Bil makes a fuel stabilizer just for Ethanol. I'm betting those procedures were written before a quality product was out. The single biggest issue with Ethanol is water absorption.

[ajholt7]

I overdose mine on Sta-bil Marine and top it off. So far so good.