winterizing 2004 8.1 mpi s procedure ??

skylark

skylark

Member
Aug 17, 2012
214
Barrie, Ontario
Boat Info
2004 380 DA
Engines
8.1 MPI's
would anyone have a cut and paste from a manual for winterizing my twin 2004's 8.1 MPI s, I don't have any manuals for the boat :huh:

the motors have the closed cooling system with the air pump.

Thanks in advance.

Gary
 
the motors have the closed cooling system with the air pump.


that means you have heat exchangers,all you need to do there is drain the raw water side.injected engines should use the remote tank mix. its the only way to protect the injectors.
 
skylark said:
could you please explain the remote tank mix, you talking fuel injectors?
Click to expand...

The remote tank mix is the cocktail that some people run through the motors to fog them for the winter. They mix up gasoline and two cycle outboard oil in a 10 to 1 mix, add appropriate amount of stabilizer in a remote tank, like an outboard tank, and plumb it into the fuel line between the fuel/water seperator and the fuel tank. then they run this mix while they are running the pink through the motors. FWIW, I go with the 2 ounces in the filter routine outlined in the manual on page 48, I feel it's easier.
Have fun
 
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my3sons
Nice manual. Where did you get it. I have printed version for my motors but an electronic copy would be nice.
 
my3sons said:
The remote tank mix is the cocktail that some people run through the motors to fog them for the winter. They mix up gasoline and two cycle outboard oil in a 10 to 1 mix, add appropriate amount of stabilizer in a remote tank, like an outboard tank, and plumb it into the fuel line between the fuel/water seperator and the fuel tank. then they run this mix while they are running the pink through the motors. FWIW, I go with the 2 ounces in the filter routine outlined in the manual on page 48, I feel it's easier.
Have fun
Click to expand...

I was wondering about preparing the fuel system for extended storage and disconnecting the harness connections from fuel pump and fuel boost pump. Does anyone have more detailed info like photos of these connections so it's clearer on what to do. The directions are kinda vague. Thanks!
 
Did the cocktail mix on my 8.1s yesterday worked great I have the gen III cool fuel modules all I did was disconnect the flare fitting going to the module from the fuel tank and attached the mixture tank which was made up from a short piece of fuel line with the 3gal tank connection on one side and the flare fitting on the other attached to fuel module started the motor ran at 1100-1200 rpm's for 5 mins then shut down thats it.ran the antifreeze through at the end of the 5 mins . If you have the cool fuel modules, this is where you attach the (pony tank) top pic. the bottom pic is the connection used to attach the tank to your temp fuel line. Hope this helps

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image.jpg]I just purchased my 340 this year with the 8.1's. I also used the mixture recommended in the mercruiser manual. I had a hydraulic hose made up with fittings to accept the 3/8 portable tank fuel line and the other end threads into the cool fuel module. The gold colored fitting on the end is removed to plug the sea ray gas line to reduce any leaking fuel for safety. The silver colored fitting attaches where the fuel line would attach. I removed the the fitting at the fuel line. I also ran the motors with the mixture for about 15 mins as the manual stated while I warmed the engines for the oil change and winterization to run the antifreeze through. Each engine took approx 8 gallons before exiting the exhaust with the antifreeze. I also drained the mufflers after running the antifreeze through. I will try to attach a pict.
 
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grettberg said:
I was wondering about preparing the fuel system for extended storage and disconnecting the harness connections from fuel pump and fuel boost pump. Does anyone have more detailed info like photos of these connections so it's clearer on what to do. The directions are kinda vague. Thanks!
Click to expand...

Yes they are, I actually cheat and do not unhook the fuel pumps. Those raw water pumps will pump enough pink through them to winterize in about a minute, which in my opinion is not enough time to clear the filter of the mix. If you want to do by the book, the harness plugs are at each pump. Don't know how the motor would even run with no fuel pressure.
 
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northern said:
my3sons
Nice manual. Where did you get it. I have printed version for my motors but an electronic copy would be nice.
Click to expand...

I don't know where I downloaded my copy from, it was 4 years ago, but a quick search on the net brought up this one so I could help out skylark. Try googling up merc 7.4 service manual? good luck
 
Skylark, Don't get confused about some of these posts from guys with later model engines with the cool fuel III, It's a different system than ours. If you want to use the auxilary tank method, a good place to plumb it in is where the in-line filter is in the fuel line between the tank and the boost pump/water sep filter, you should be changing the in-line filt anyway.
 
I just realzed the year of his boat, they switched to gen III in 05' I believe. Sorry for the confusion
 
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