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Engine basics => Engine set up tips => Topic started by: Rudy Taube on July 19, 2007, 09:53:43 PM

Title: Is WD-40 OK for a gummed up Eng. ???
Post by: Rudy Taube on July 19, 2007, 09:53:43 PM

I have a .54 TT 4S that was set aside 5 years ago. I want to use it now for CL but it is all gummed up from being stored without any TLC.  :-(

Can I just spray WD40 in it, valves, intake, etc.,  and get it loose? Or is there a better way? Is WD40 harmful to our aluminum model engines?

My club members suggested buying a used crockpot and cooking the engine in antifreeze (the kind for aluminium engines). This seems rather drastic, is it the best way to loosen up the engine?

TIA for your help. :-)

Title: Re: Is WD-40 OK for a gummed up Eng. ???
Post by: Ralph Wenzel (d) on July 20, 2007, 12:03:52 AM

Start off by preheating your oven to 350°. Put the engine on a cookie sheet or doubled aluminum foil and "bake" for about 10 - 15 minutes. Use hotpads or a barbeque glove to remove the engine from the oven and install a prop. It should be quite loose and easy to turn over. Now's the time for the WD-40. Spray liberally and start turning the prop over.

When you're happy with the way it feels, flush it with fresh fuel (outside, please!) and drain. Now, lube with a good after-run oil, flip the prop a few times, and you're ready to go.

Title: Re: Is WD-40 OK for a gummed up Eng. ???
Post by: Paul Smith on July 20, 2007, 05:13:02 AM

I agree with the heat, but in lieu of invading the kitchen, a MonoKote iron can get it done, too.

I was working on a "frozen" engine last month.

It defied WD-40, denatured alchohol, and acetone, but came loose to the heat gun.

ps: The crock pot is good for surface oil, but I wouldn't bet on it (or wait all night) for a frozen engine.