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indr 01-09-2013 02:57 PM

Cleaning Engine Sludge
1. The engine is off the bike. The crankcase is split with the transmission / drive shaft / shift drum / everything taken out of it.

2. A couple of days ago, I soaked the crankcase halves in some Murhphy's Oil Soap.

3. Now, there is slick sludge in various places on the CC halves. Inside and out. In corners and on surfaces. I'm thinking it's something like molybdenum mixed with the oil and soap. It's white/greyish.

4. It's very light in viscosity. But, there's a lot of it and it's in nook and crannies where I can' reach with a toothbrush or towel. Using a pick would take a long time.

What's the best and fastest way to dissolve this slime from the crankcases? Something that'll clean out the oil passages because I have a feeling there's a lot of the stuff in there. Are mineral spirits going to strip the engine paint?

sparkymcgee 01-09-2013 04:30 PM

I've heard Pine Sol is the go to cleaner for engine parts. Haven't tried it, but I've seen pics and things come out gleaming.

Beezer 01-09-2013 05:23 PM

kerosene, diesel, mineral spirits, gasoline.... something petro

RTCHIEF 01-09-2013 06:37 PM

Have it hot tanked.

CaptTeach 01-09-2013 08:33 PM

Easy Off oven cleaner in the yellow can - Place in the sun to warm up the part then spray Wait twenty minutes or so and either re-coat or rinse with water

HapHazard 01-09-2013 08:51 PM


Originally Posted by RTCHIEF (Post 20440715)
Have it hot tanked.

No - that will effectively dissolve aluminum.

Try the PineSol first.

H96669 01-09-2013 09:19 PM

Murphy oil soap, that's to clean wooden floors, not much degreasing power.

I king of object to some of the above suggestions, Caustic Lye products such as hot tanks or oven cleaners, really bad for aluminium. But I can be patient and don't have a problem picking at stuff for a long time.:evil

Go buy some Castrol engine cleaner/degreaser at CT.:1drink

Beezer 01-10-2013 12:44 AM

if petro products don't work try paint stripper... it has methyl chloride which one of the really good cleaners we used to have in the old days, but bear in mind there are reasons it isn't used for that anymore... like it's pretty evil on your body. I brush it on and cover it with plastic sheet to keep it from evaporating

if you buy "gasket remover" in a spray can thats all it is... paint stripper

Easyoff is ok on stainless steel but be careful on aluminum... it can eat alloy

concours 01-10-2013 05:19 AM

Spray wand at the car-wash, hot soapy water. Have WD-40 WITH YOU to stop the IMMEDIATE rusting on the steel bits.

bomber60015 01-10-2013 09:13 AM


Originally Posted by concours (Post 20443596)
Spray wand at the car-wash, hot soapy water. Have WD-40 WITH YOU to stop the IMMEDIATE rusting on the steel bits.

^ right here!

Murphy's oil soap? THAT is a truely novel application for this product . . . . .

redprimo 01-10-2013 03:13 PM

Dishwasher works great on chainsaw cases.

ragtoplvr 01-10-2013 03:30 PM

Vote for car wash, use lots of rinse. You are in BC so it is cold, keep case from freezing until you blow out well. When home blow out all passages real well. Bake in oven if at all possible at 225 for an hour minimum to dry all parts. Alternate put some place warm like near your wood stove or over a heat vent.


troidus 01-10-2013 05:33 PM


Originally Posted by redprimo (Post 20448569)
Dishwasher works great on chainsaw cases.

And on an aluminum wheel from a salvage yard.

RTCHIEF 01-10-2013 05:40 PM


Originally Posted by HapHazard (Post 20441845)
No - that will effectively dissolve aluminum.

Try the PineSol first.

How do engine rebuilders clean oil from aluminum?

fritzcoinc 01-10-2013 07:44 PM

Gunk Engine cleaner.

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