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petermerle
Expert
Date registered: Apr 2006
Location: Cape Town ( deep south )
Vehicle(s): W460 *1, W123 *2, W124
Posts: 1315
| Diff lock Master cylinder
Thought I would dismantle the diff lock master cylinder on my 1982 G but could not work out you to get the piston out. I removed boot ( was shredded ) the circlip and washer and thats as far as I could go. How do you get the piston out?
BTW is there an alternative boot I can use as EPC states that boot is no longer available
Peter |
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4x4abc
Date registered: Apr 2006
Location: La Paz, Baja California, Mexico
Vehicle(s): 02 G500
| RE: Diff lock Master cylinder
carefully blow air from line side - that will drive the piston out. Cover exit with towel or similar - you dont want the piston become a projectile and hit someone. Been there, done that. It hurts. |
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petermerle
Expert
Date registered: Apr 2006
Location: Cape Town ( deep south )
Vehicle(s): W460 *1, W123 *2, W124
Posts: 1315
| Re: Diff lock Master cylinder
I did give it it a try however could not get a good coupling between air line and hydraulic line . I got th e distinct feeling that there was something positive preventing the piston coming out. Will give it another go , thanks
Peter |
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4x4abc
Date registered: Apr 2006
Location: La Paz, Baja California, Mexico
Vehicle(s): 02 G500
| Re: Diff lock Master cylinder
rust! |
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Mark G
Date registered: Jul 2006
Location: Ft. Lauderdale, FL USA
Vehicle(s): 1985 280GE LWB AT
| RE: Diff lock Master cylinder
Harald is right... based on his advise the piston can come out like a torpedo. The attached image shows what you can expect to find once you get it all apart.
 (IMG_5109 copy.JPG)
Attachments
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 IMG_5109 copy.JPG (140KB - 9 downloads)
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Boy G
Expert
Date registered: Feb 2007
Location: Bushveld, South Africa
Vehicle(s): Diesel G's: 617A and 602
Posts: 1683
| Re: Diff lock Master cylinder
Peter,
We had some made in JHB. How many do you need? PM me.
There is an old VW beetle boot that fits and an older Landcruiser boot that will do.
Haralds remedy is the only non destructive way to remove. Try gently knocking the piston inwards before blowing - maybe the rust has bitten...
The destructive ways are plenty! 1. Drill and tap into the piston and pull. 2. Drill and tap the back of the housing, knock through and fit a 3/16" plug to seal again. Etc Etc
The internals are available from your Midas / Autozone
Master LMB EUROSEALS RK 7.19.25
Slave LMB EUROSEALS RK 4.25.05
Rgds
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petermerle
Expert
Date registered: Apr 2006
Location: Cape Town ( deep south )
Vehicle(s): W460 *1, W123 *2, W124
Posts: 1315
| Re: Diff lock Master cylinder
Thanks Guys
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Wout
Veteran
Date registered: Apr 2006
Location: Belgium
Vehicle(s): Mercedes 280GE 1979/230G 1980/ C220CDI/A170CDI/
Posts: 145
| Re: Diff lock Master cylinder
Good day to all.
If the trick with the compressed air doesn't work, there is always the possibility to
press the cilinder out with a manual grease press. Take the niple off the hose of your grease press and
connect it to the hydraulic line in (Most probably it will fit without any adaption).
With a few strokes you can push the piston out.
It worked for me.
If it works, take care to remove the grease before reassembling the cilinder.
wkr
Wout |
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4x4abc
Date registered: Apr 2006
Location: La Paz, Baja California, Mexico
Vehicle(s): 02 G500
| Re: Diff lock Master cylinder
if it was rusted in place, the cylinder will need honing and if the pitting is really bad you'll need a new master anyway - or sleeve it like it was described for clutch slave/master here or on the other forum before. |
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roughneck
Expert
Date registered: Apr 2006
Location: UK, Germany & USA
Vehicle(s): 270 cdi.300 GD 300 GE.lwb 300 GE.swb. Disco 2
Posts: 4398
| RE: Diff lock Master cylinder
Peter, I have a memory that the boot is similar/same as a 2CV brake master, my favorite tool for moving rust, soak in kero, blow/pump out. Haralds method is a good one, grease pump is more control, have fun its a satisfying job to complete.  |
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Boy G
Expert
Date registered: Feb 2007
Location: Bushveld, South Africa
Vehicle(s): Diesel G's: 617A and 602
Posts: 1683
| Re: Diff lock Master cylinder
Peter,
Found it. The boot no. is LMB EUROSEALS H102.
rgds |
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petermerle
Expert
Date registered: Apr 2006
Location: Cape Town ( deep south )
Vehicle(s): W460 *1, W123 *2, W124
Posts: 1315
| Re: Diff lock Master cylinder
Thanks - I ordered a boot for tierod/draglink from Mercedes - part no A6313380297 ( found for truck on EPC ) and received it today . Looks like it will work for G.
Peter
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