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Cleaning The Inside Of A 4Spd?


gwb72tii

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So I am replacing seals on my 4 spd getting ready to reinstall it into my car. I've got the perfect opportunity to clean out the insides of the tranny as it sits on my workbench, if it makes sense to do so?

Necessary?

Advisable?

What solvent?

Thanks in advance

72 2002tii

1988 535is  “Maeve”

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The stuff that's stuck to the inside of the case will in all likelihood stay there - that's why it's there now.  As long as it stays there, it can stay there and do no harm.  This is just like using non-detergent oil in old VWs, just don't change it without a complete disassembly and cleaning.

 

That said, I like to clean stuff if I have it off, because all too frequently the next guy in there to fix the mess I made, will be me.  And it's MUCH nicer to work on clean stuff.

 

I wouldn't bench clean it as this would be unlikely to be thorough without disassembly.  Rather, I'd put 50/50 ATF and trans oil in it and run a few hundred easy miles, then drain thoroughly when warm and refill with your choice of lubricant.

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Unless some metal shavings (or chunks) came out with the oil when you drained the gearbox, you probably don't have anything to worry about.  No combustion by-products inside a gearbox like there is in an engine, and no coolant either (you hope!) so things don't really get "dirty." 

 

mike

'69 Nevada sunroof-Wolfgang-bought new
'73 Sahara sunroof-Ludwig-since '78
'91 Brillantrot 318is sunroof-Georg Friederich 
Fiat Topolini (Benito & Luigi), Renault 4CVs (Anatole, Lucky Pierre, Brigette) & Kermit, the Bugeye Sprite

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One of the better ways to clean gearboxes is to run auto trans fluid, and change it a couple of times.

 

That stuff loves to clean things out for you.

 

Don't drink it, of course.

 

t

"I learn best through painful, expensive experience, so I feel like I've gotten my money's worth." MattL

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i'd never put anything back together dirty. my 3-spd is damn near polished from when i replaced the rear main seal.

 

brake & parts cleaner and/or degreaser, kerosene, petrol etc. will all work great. just make sure you 100% it if you start it because anything you leave there will be more likely to circulate itself around the gearbox.

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I put lots of things back together that aren't spotless- life's too short.

 

BUT you DO need to clean the things that matter.  The inside of the bellhousing is not one of those things...

 

The inside of your coffee cup, now, that's a matter of taste.

 

t

"I learn best through painful, expensive experience, so I feel like I've gotten my money's worth." MattL

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I put lots of things back together that aren't spotless- life's too short.

 

BUT you DO need to clean the things that matter.  The inside of the bellhousing is not one of those things...

 

The inside of your coffee cup, now, that's a matter of taste.

 

t

you never was a coffee cup

you just bore them out once in a while

72 2002tii

1988 535is  “Maeve”

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