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#1
05-10-2011, 03:22 PM
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Topsider transmission oil change?
A few weeks ago, I made a topsider (vacuum oil sucker) that fits over the top of the engine oil dipstick tube and it worked amazingly well. It didn't leave a drop in the pan and got all of the oil out of the filter housing!
I am wondering if anyone has tried to do a transmission oil change the same way using vacuum. Does it get all of the transmission oil out including what's in the torque converter?
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85 300D turbo pristine w 157k when purchased 167,870 July 2025 83 300 D turbo 297K runs great. SOLD! 83 240D 4 spd manual- parted out then junked 
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#2
05-10-2011, 03:56 PM
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It won't drain the torque converter, and why would one not want to change the filter anyway? Nice thought, but .....
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80 300SD (129k mi) 82 240D stick (193k mi)77 240D auto - stick to be (153k mi) 85 380SL (145k mi) 89 BMW 535i 82 Diesel Rabbit Pickup (374k mi) 91 Jetta IDI Diesel (155k mi) 81 VW Rabbit Convertible Diesel 70 Triumph Spitfire Mk III (63kmi)66 Triumph TR4a IRS (90k mi)67 Ford F-100 (??)
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#3
05-10-2011, 04:05 PM
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Yeah nice idea - as rs899 says it probably wouldn't get the oil out of the torque converter. The oil goes in via the input shaft when you fill it from the gearbox, but it would probably be stuck in there if you tried to suck it the same way out.
My main problem with this is that I wouldn't trust the vent on the top of the gearbox to be clean - imagine sucking in a load of crap by accident... I'm not sure about this one funola... ...I'll have a closer look at the vent on my 722.118 and post some pictures if necessary.
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1992 W201 190E 1.8 171,000 km - Daily driver 1981 W123 300D ~ 100,000 miles / 160,000 km - project car stripped to the bone 1965 Land Rover Series 2a Station Wagon CIS recovery therapy! 1961 Volvo PV544 Bare metal rat rod-ish thing I'm here to chat about cars and to help others - I'm not here "to always be right" like an internet warrior  Don't leave that there - I'll take it to bits! Last edited by Stretch; 05-10-2011 at 04:07 PM. Reason: Added a bit
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#4
05-10-2011, 04:56 PM
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I do this. I've decided to change the gasket and filter somewhat less frequently and change the fluid more frequently. When I extract the fluid using a topsider, I get out between 2.0 and 2.3 quarts. So what I do is do it several times over the course of several hundred miles. If you do the math, doing this four times gives you ATF that's about as pure as it would be if you drained the pan and the torque converter....and you've used just a little more ATF than you would with the conventional method.
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14 E250 Bluetec 4Matic "Sinclair", Palladium Silver on Black, 158k miles 06 E320 CDI "Rutherford", Black on Tan, 177k mi, Stage 1 tune, tuned TCU 91 300D "Otis", Smoke Silver on Tan, 144k mi, wastegate conversion, ALDA delete 19 Honda CR-V EX 72k mi Fourteen other MB's owned and sold 1961 Very Tolerant Wife
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#5
05-10-2011, 05:21 PM
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I do this all the time. Helpful on cars that dont have a drain plug on the pan, too, as it keeps the mess from being as big when dropping it to do the filter.
I like to keep a slight replacement of fluid at all times, so I do this as maintenance too.
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Current Diesels: 1981 240D (73K) 1982 300CD (169k) 1985 190D (169k) 1991 350SD (116k) 1991 350SD (206k) 1991 300D (228k) 2008 ML320 CDI (199k) 1996 Dodge Ram CTD (442k) 1996 Dodge Ram CTD (267k) Past Diesels: 1983 300D (228K), 1985 300D (233K), 1993 300D 2.5T (338k), 1993 300SD (291k)
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#6
05-12-2011, 09:16 AM
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Quote:
__________________
85 300D turbo pristine w 157k when purchased 167,870 July 2025 83 300 D turbo 297K runs great. SOLD! 83 240D 4 spd manual- parted out then junked
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#7
05-12-2011, 09:53 AM
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to do this, you would need a tube to dip down to the bottom of the pan. the transmission dipsticktube does not extend even below the valve body.
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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread "as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do! My drivers: 1987 190D 2.5Turbo 1987 560SL convertible 1987 190D 2.5-5SPEED!!!  1987 300TD 2005 Dodge Sprinter 2500 158"WB 1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!
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#8
05-12-2011, 09:57 AM
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Quote:
Here you go. It is lucky I've got the transmission in bits eh? The vent is situated (on a 722.118) on the bell housing right at the top. You might be able to see it from the engine bay - but it such a long time since I've had my engine and transmission in the car I've forgotten what it looks like! Anyway first picture:-  The vent is the black plastic bit. It attaches to a hole in the casting that runs all the way through into the inner part of the casing - past the large circular flange - and past the next small hole and the bit sticking up, to a small round hole you can see in this picture:-  The other end of the vent is here - this is on the outside of the casing - so it is the black plastic bit:-  You can see here that air can flow in or out of both ends of the end of the vent - you can see straight through - so I guess the actual entrance to the casing (you can just see it in this picture) is covered up quite well.
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1992 W201 190E 1.8 171,000 km - Daily driver 1981 W123 300D ~ 100,000 miles / 160,000 km - project car stripped to the bone 1965 Land Rover Series 2a Station Wagon CIS recovery therapy! 1961 Volvo PV544 Bare metal rat rod-ish thing I'm here to chat about cars and to help others - I'm not here "to always be right" like an internet warrior Don't leave that there - I'll take it to bits! Last edited by Stretch; 05-12-2011 at 09:58 AM. Reason: I added a comma
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#9
05-12-2011, 11:33 AM
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You have to take the pan off anyway
You will have to take the transmission oil pan off anyway to change the filter.
__________________
1991 350SD (updated rods) Biodiesel B100 when I can find it. Dino when really cold outside
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#10
05-12-2011, 12:23 PM
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I use a topsider as the first step in servicing a transmission. It's faster/easier/neater than draining the pan by removing the drain bolt. But after that, it's the standard service procedure - drop the pan, change the filter, drain the converter. Did my 124 this past weekend. It's still a nasty, messy job - there's no way to change the filter without dropping a fair bit of transmission fluid.
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#11
05-12-2011, 01:05 PM
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Quote:
In the picture below it is the large bolt (without the banjo and filler tube sorry) on the top right hand side of the oil pan. 
__________________
1992 W201 190E 1.8 171,000 km - Daily driver 1981 W123 300D ~ 100,000 miles / 160,000 km - project car stripped to the bone 1965 Land Rover Series 2a Station Wagon CIS recovery therapy! 1961 Volvo PV544 Bare metal rat rod-ish thing I'm here to chat about cars and to help others - I'm not here "to always be right" like an internet warrior Don't leave that there - I'll take it to bits!
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