Fogging Horizon 7.4's

[msballin]

Good evening -

Last year, my first with "Just Add Water" I observed my mechanic fogging my engines as he was instructing me on the process. I seem to remember him adding fogging oil through a hose he disconnected from the pcv valve. As I am preparing to take her out and winterize the engines, I was curious if anyone was familiar with this technique and if so, is it appropriate to utilize the mixture of 87 octane gas, 2 cycle quicksilver oil and stabilzer as recommended by mercruiser.

Any input you can give would be gratefully appreciated. Thanks.

Mike

 

[FireIsland1]

I use to do something similar. Using the same mixture, i would mix up 2 quarts then spin off the fuel filter. With a new filter full of the mixture start the engine for 2 minutes and your done.
then I started thinking. How does the engine know it's winter? If it was summer and i wasn't going to use the boat for 3 months, what would I do. The answer was I would do nothing. So for the last 6 years I just shut them off. Comes spring I just start them up.
Just for the record I change all fluids, filters, and ingition parts annually.

 

[douglee25]

Good evening -

Last year, my first with "Just Add Water" I observed my mechanic fogging my engines as he was instructing me on the process. I seem to remember him adding fogging oil through a hose he disconnected from the pcv valve. As I am preparing to take her out and winterize the engines, I was curious if anyone was familiar with this technique and if so, is it appropriate to utilize the mixture of 87 octane gas, 2 cycle quicksilver oil and stabilzer as recommended by mercruiser.

Any input you can give would be gratefully appreciated. Thanks.

Mike

Basically it's 6 1/2 dozen and the other. The main goal is to get some oil in the cylinders for winter storage. You can use fogging spray, mercruiser recommends a 2 cycle mixture in the fuel filter, etc. The same thing could be accomplished by sucking 2 cycle oil through the PCV line into the carb/throttle body.

Doug

 

[fc3]

All running fogging oil or two cycle oil though the complex shape of the EFI engine's intake manifold will accomplish is to create a giant puddle of oil at the bottom of the plenum. Pull the manifold halves apart to see what I mean.

If you are going to fog, mix 2 cycle with gas and fog according to Merc's recommended procedure.

Best regards,
Frank

 

[msballin]

Thanks all. Frank, question? Upon commisioning I had stall issues because of IAC. Could this have been caused because of adding fogging mixture through intake manifolds? THX

 

[douglee25]

Doubtful. IAC's typically seize up from a slight carbon build up.

Doug

 

[msballin]

Thx. So, is it safe to assume that the fogging should be done while drawing up the pink through the raw water intakes at the end of the procedure of winterization of the engines? If so, is it better to use fogging mixture held in remote tank attached to intake of fuel water separator?

 

[Lazy Daze]

Thx. So, is it safe to assume that the fogging should be done while drawing up the pink through the raw water intakes at the end of the procedure of winterization of the engines? If so, is it better to use fogging mixture held in remote tank attached to intake of fuel water separator?

If you use a remote tank, it makes it a little easier to not waste as much pink.

You could just fog it through the spin-on filter (check your manual), then stop the engine. Then drop the water out and re-fill through the hose or the t-stat. It should take all of about 10 minutes to do it this way. And, you're assured to get the right amount of pink in there w/o wasting any.