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Substitute ATF for Marvel Mystery Oil?

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Rob

01-01-2002 14:54:02

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A guy was telling me that the less expensive ATF can be used in place of Marvel to clean up an engine. I've got a quart of Marvel in the crankcase and half a can/10 gals of fuel in the tank now. I only have a couple three hours on the Marvel. There's a few ounces of 2-cycle oil in the tank but the smoke pre-dates the oil. The plugs get black-wet. She has good power and I don't see any blow-by out the oil-filler so I haven't worked up the motivation to check the compression.
She smokes at higher RPM, really a lot of black smoke when I yank on the throttle! Otherwise too much lighter colored smoke at the higher RPM and the stuff behind the tailpipe has that oily soot all over it. There may be less smoke at idle now with the Marvel but I hate to say that. I'm the kind of guy that thinks my Tbird runs better after I wash it so I may be imagining the less smoke at ilde. However, I'm fairly sure my hot oil pressure is higher at idle now then it was before the Marvel. It's still low at 9-10 psi but it comes up with rpm. We'll see after I've had to push some snow.
When I rebuilt the carb I just left the needle at 1 turn so might it be that it's running rich? The book says set the needle at "governed speed at full load" and I don't understand how to "load" it while it's standing still so I can adjust the needle!
Any instruction, ideas, or comments?
One more thing. I've got a lot of moisture in the tranny et al. I changed it out in August but didn't spend anytime cleaning in there. I'm going to have to change it again. I wonder if a couple quarts of ATF in there would clean the tranny up and thin the cold fluid.

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Gaspump

01-01-2002 17:12:30

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Re: Substitute ATF for Marvel Mystery Oil? in reply to Rob, 01-01-2002 14:54:02

Marvel Mystery Oil is a mild solvent. I would say that a last ditch effort to loosen up stuck rings and valve guides would a good use for it, especially in an engine that has seen little use for years. That seems to be what you are describing with your intended useage of it. It has worked for me on my 8N that was parked outside, untouched for 15 years before it was dumped on me here in FL. The heavy dosing with MMO was a last ditch for me and it, coupled with some continued usage afterword with no MMO worked. Engine compression progressed from 68-90# to 98-115# over a months span. I did restore this unit at a later date and now it is 100%. As far as using cheaper tranny fluid I say NO WAY! It is much more caustic and not for engines. By the way $5 to $2 is the savings, do not chance it for that figure.

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Dell (WA)

01-01-2002 15:31:16

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Re: Substitute ATF for Marvel Mystery Oil? in reply to Rob, 01-01-2002 14:54:02

Rob..... ..change yer sparkies to hotter range, that'll get rid of yer wet/oiley look.

Can never understand why anyone would put oil in gasoline EXCEPT FOR 2-CYCLE engines. Now drygas and stabgas differnt story and purposes. Now some crankcase additives for oil, different purposes. MMO works pretty good. ATF not the same thing, doesnot have the solvents that MMO has.

Why are you surprized when you get a puff of black smoke when ya goose yer throttle and you haven't adjusted yer main jet? Go 1/8 turn from where yer at (1 turn right now) and see if'n the blackpuff don't go away. It really is only critical if'n yer axle deep plowin' and will affect your fuel milage or gal/hrs. Too lean annna ya won't beable to pull yer 2-bottom plow in 2nd gear.

Put a new rubber tranny shifter boot on (boil it in hot water for a few minutes to make it soft enuff to strech over everything). Then change yer tranny/hydraulic to Ford/New Holland recommended M2C-134D hydro/tranny fluid. Before the water innna yer hydropump freezes and breaks sumpthin..... .Dell

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Rob

01-02-2002 04:47:00

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Re: Re: Substitute ATF for Marvel Mystery Oil? in reply to Dell (WA), 01-01-2002 15:31:16

Thanks for the pointers. That guy said the cleaning properties in the ATF (detergents?) would do as good a job as the solvents in the MMO. If MMO doesn't get it done then I may try the ATF to avoid having to teardown the engine.
Now I put that 2-cycle oil in there 'cause it was already in the gas I wanted to get rid of. WTH, the N was already smoking! :-)
Warming that boot up to get it soft is a good lick. I put a new boot on there when I changed the fluid but it was slipping off the tranny until I wrapped a piece of wire around it. Another guy suggested a tye-wrap and I plan on using a silicone adhesive once it warms up enough to use the stuff. I don't really like the wire but what the hey it may still be on there 5 years from now. You know, now it's a "if it ain't broke then don't fix it" kinda thing.

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