Manual Transmission Gurus -- QUESTION - Page 2 - PeachParts Mercedes-Benz Forum

cullennewsom · #16 10-31-2012, 11:13 PM

Quote:

Originally Posted by whunter

The 20W50 weight oil may function in Texas summer heat.

I can assure you it is to heavy/thick for colder temperatures.

The MB manual trans is designed - engineered for the light - thin, high detergent Dexron-Mercon III..

.

I won't disagree with that. If it was spec'd out with Dexron, you almost can't go wrong.

Govert · #17 11-01-2012, 02:09 AM

80W manual gearbox oil (MB 235.1) is thin like ATF.

tjts1 · #18 11-01-2012, 02:40 AM

Quote:

Originally Posted by Govert

80W manual gearbox oil (MB 235.1) is thin like ATF.

AKA GL4
MB 235.1 - Gear oils (Specification 235.1) - Mercedes-Benz Specifications for Operating Fluids

whunter · #19 11-01-2012, 03:44 AM

Quote:

Originally Posted by Govert

80W manual gearbox oil (MB 235.1) is thin like ATF.

I suggest you research the subject, your manual gearbox will behave better when you change.
ATF is a thin light high detergent oil.

All 80W are heavy viscous oils by comparison.

.

Govert · #20 11-01-2012, 06:02 AM

Quote:

Originally Posted by whunter

I suggest you research the subject, your manual gearbox will behave better when you change.
ATF is a thin light high detergent oil.

All 80W are heavy viscous oils by comparison.

.

It didn't behave better or worse compared to ATF. If you look at the product sheets, there is not much difference in viscosity and I didn't notice much difference either when I put the oil into the gearbox.

Simpler=Better · #21 11-01-2012, 09:20 AM

Quote:

Originally Posted by torsionbar

atf in a manual gear box? are you sure that's correct? atf pours like water while normal gear oil is significantly more viscous. i'm not familiar with mercedes manual transmissions, but i've never heard of using atf in a manual gearbox, except in extreme arctic climates.

FYI my Ford (Mazda manual trans) specs ATF

greazzer · #22 11-01-2012, 09:24 AM

Quote:

Originally Posted by t walgamuth

the clutch engagement is low on that car because we planed the flywheel but did not shim it in an equal amount. I did not know it at the time but if you take off a given amount from the face of the MB flywheel you must shim the backside to keep the normal engagement point of the pedal inside the car. The engagement point will rise as it wears.

Now you tell me ... I guess I missed that part of the sale ad ... LOL. I am still going to do the maintenance since I am hoping that will help some. However, at no time soon am I going to pull that transmission to "shim" the FW unless the car really gets too problematic to shift. That is a major operation and a large time bandit. Plus, I will have to replace the 12 or so bolts when I pull the FW plus the machining to double check everything plus the shims, so that sounds pretty expensive. BTW -- do you recall how much I would need to shim it by? That is, how much was shaved off the FW ? I know the FW which I gave you as part of our sale / swap wasnt "shaved" down so this is all new to me.

Simpler=Better · #23 11-01-2012, 09:57 AM

Probably not too much-what, maybe .050" to restore the surface?

Those bolt can be reused, just measure their length when you take them out and compare to the spec. Or go ARP and red locktite.

greazzer · #24 11-01-2012, 10:01 AM

Are the shims like injector shims ? That is, a washer that goes behind each of the FW's bolts or just one big one that goes behind the FW to "push" it out ?

Simpler=Better · #25 11-01-2012, 10:08 AM

I've never seen any of this stuff, but I would assume it's a ring with 12 holes in it to keep the contact surface large. 12 washers would put a shearing force on the bolts and not last long.

PackerEdgerton · #26 11-01-2012, 11:34 AM

Hi guys,

I've been planning to flush and fill the Manual Tranny as well. What do you think of this ATF for use in the tranny?

Red Line Synthetic Oil - Automatic Transmission Fluids - High-Temp ATF

Sincerely,

Packman

whunter · #27 11-01-2012, 12:58 PM

Quote:

Originally Posted by Govert

It didn't behave better or worse compared to ATF. If you look at the product sheets, there is not much difference in viscosity and I didn't notice much difference either when I put the oil into the gearbox.

We will continue to disagree.

Oil Viscosity - How It's Measured and Reported

Viscosity Charts - Bob is the Oil Guy

Putting the Simple Back into Viscosity - Bob is the Oil Guy

t walgamuth · #28 11-01-2012, 01:31 PM

Quote:

Originally Posted by greazzer

Now you tell me ... I guess I missed that part of the sale ad ... LOL. I am still going to do the maintenance since I am hoping that will help some. However, at no time soon am I going to pull that transmission to "shim" the FW unless the car really gets too problematic to shift. That is a major operation and a large time bandit. Plus, I will have to replace the 12 or so bolts when I pull the FW plus the machining to double check everything plus the shims, so that sounds pretty expensive. BTW -- do you recall how much I would need to shim it by? That is, how much was shaved off the FW ? I know the FW which I gave you as part of our sale / swap wasnt "shaved" down so this is all new to me.

I don't know how much was skimmed. Like I said we didn't realize it mattered so my machinist just took enough to clean up the flywheel. Next one I have planed I plan to figure all that out. I have a ring with the twelve bolt holes in it I believe to be from an automatic equipped car which I plan to have planed but first I will have to figure out how thick the flywheel is supposed to be and measure that.

greazzer · #29 11-01-2012, 03:44 PM

Quote:

Originally Posted by t walgamuth

I don't know how much was skimmed. Like I said we didn't realize it mattered so my machinist just took enough to clean up the flywheel. Next one I have planed I plan to figure all that out. I have a ring with the twelve bolt holes in it I believe to be from an automatic equipped car which I plan to have planed but first I will have to figure out how thick the flywheel is supposed to be and measure that.

OK ... I think flushing and replacing the tranny fluid will get the old girl humming again. Where did you buy the shim at ?

Air&Road · #30 11-01-2012, 03:49 PM

Quote:

Originally Posted by greazzer

I know the FSM clearly states to use ATF in the manual gearbox. In the late 70's and early 80's, there were only a few options out there in the AFT world, e.g., Type "F", et cet. Now, there are a zillion options.

My question is:

What does one use when chaning out the manual transmission gear box oil. That is, what type of ATF ? I have seen where folks posted all kinds of answers from varying types of oil, e.g., W20, W50, et cet. I would suspect those answers are just wrong. So, assuming the FSM is the best source of info, any leads on the best / correct ATF ???

Application: W123 Getrag 717.400 Five Speed.

Also, can one adjust the clutch ?

I've run a total of almost a million miles in manual transmission MB's one of them over a half million miles, with 10W30 Mobil One. If you don't drive in cold weather, straight 30 would do fine. If you decide to use ATF, use Type A. Dexron has morphed into a totally different fluid over the years and now has additives that MIGHT not be good for the seals in the transmission.

Hope this helps.

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode