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#1
05-02-2019, 10:17 AM
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leaking oil under dash/carpet? clutch
Hello Group. I have a 1981 240 - standard.
The other day i noticed bit of oil on my floor mat and didn’t think much of it - just washed and dry if off. Just thought i must have spilled something; since i just changed the oil and injectors. ANyway, yesterday i noticed the oil came bank on the driver side floor mat and under the carpet. I Looked under the dash and it looks like it is coming somewhere from the clutch. the oil pressure cable looks ok. Both brakes and clutch is working fine and i do not see any leaks under the car. I been reading few other posts and the problem/leak seems to be with the with the brake fluid system which is also connected to the clutch. Most are suggesting it is the slave clutch cylinder but the leak is under the dash. What part or where can this leak be from. It does seem to be the brake fluid; since it went low, as well. It is my everyday drive so need to fix it soon as possible. Thank you. Mac 
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#2
05-02-2019, 09:37 PM
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Quote:
You are correct, it is not the slave cylinder, that being located on the side of the gearbox. The clutch master cylinder is located at the top of the clutch pedal, and is supplied with fluid from the brake reservoir. A leak from the clutch master cyl. is not unusual.
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#3
05-02-2019, 09:48 PM
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Put aluminum foil where it drips and try to identify the fluid. Should only be brake fluid from the clutch master OR engine oil from the oil pressure gauge. Compare the sample to the brake fluid in the reservoir and the engine oil on the dipstick to determine which it is.
IIRC there is an 8mm ID cloth braided hose from the brake fluid reservoir to the clutch master cylinder inside the car above the clutch pedal. Check it closely for leaks. Good luck!!!
__________________
"Rudeness is a weak man's imitation of strength" - Eric Hoffer
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#4
05-02-2019, 11:37 PM
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Easiest solution would be to pull the cluster and see if the oil pressure gauge is leaking. If not, it's your clutch.
__________________
-Typos courtesy of my mobile phone.
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#5
05-03-2019, 06:48 AM
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Roger the Beast. Almost certainly the oil pressure gauge fitting. Look for a loose connection. Worst case cracked at the gauge thus needing gauge replacement. Cheap and easy. Do not overtighten!
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#6
05-03-2019, 11:32 AM
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Got it - Will check it out on Sunday (using my bike for now..)
Busy at work and family/friends all today and tomorrow. Thank you.
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#7
05-05-2019, 04:58 PM
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Alright. Looks like it is the brake oil. leak looks to be from the black cylinder connected to the clutch. 8mm cloth braided hose looks dry and good. All connection good look. I did remove the console a bit to check if any leak with the oil pressure line - really did not need to remove the console. I just lied on the back under the dash and with a flash it was easy to check it out. All looks basically new and dry and no sign of leak anywhere close to console.
Is replacing the clutch master cylinder a easy job and will i need to bleed the clutch? (and i noticed there seem to be 2 different type of master clutch cylinder - how to order the correct part?) thanks Last edited by msandhu413; 05-05-2019 at 06:48 PM.
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#8
05-05-2019, 09:53 PM
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Quote:
Bleeding seems to be the biggest hang up. Repair Links Fast navigation http://www.peachparts.com/shopforum/diy-links-parts-category/146034-fast-navigation-do-yourself-links.html
__________________
84 300D, 82 Volvo 244Gl Diesel
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#9
05-05-2019, 10:01 PM
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Unless it appears new, consider replacing the clutch slave cylinder and the braided cloth hose the same time as the clutch master.
Good luck!!!
__________________
"Rudeness is a weak man's imitation of strength" - Eric Hoffer
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#10
05-06-2019, 11:30 AM
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Quote:
Thanks.
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#11
05-06-2019, 12:00 PM
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Hydraulic Hoses
The blue braided hose leads from the brake fluid resivoir to the master cylinder, also underneath the car is a rubber flex hoes you'd be wise to replace .
__________________
-Nate 1982 240D 408,XXX miles Ignorance is the mother of suspicion and fear is the father I did then what I knew how to do ~ now that I know better I do better
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#12
05-06-2019, 12:04 PM
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I used 3/16 fuel line to replace the hose from the brake reservoir.
As for replacement, the the two left pedals are part of an assembly that's bolted to the firewall. IIRC there's a lock pin that you pull out of the brake pedal at the brake master input shaft. I think 10 or 12 and 14 mm line wrenches will break the connection at the hydraulic line. Pull the assembly out and replace the cylinder then put it back in as an assembly. The clutch hydraulics can be a pain to bleed. I'd try and get away with just replacing the hose from the brake reservoir rather than replace the sender cylinder right away.
__________________
CC: NSA All things are burning, know this and be released. 82 Benz 240 D, Kuan Yin 12 Ford Escape 4wd You're four times It's hard to more likely to concentrate on have an accident two things when you're on at the same time. a cell phone. www.kiva.org It's not like there's anything wrong with feeling good, is there?
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#13
05-06-2019, 02:16 PM
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So, what came of this? I hate cliff hangers damn it!
__________________
-Typos courtesy of my mobile phone.
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#14
05-06-2019, 02:31 PM
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Quote:
I'd call the MB Classic Center, provide your VIN, and get the correct part. If you get the wrong master cylinder, it won't work correctly or maybe won't work at all, due to different lengths of the push rod between the clutch pedal and the master cylinder. Many have been very frustrated when this attempted repair goes wrong, due to wrong parts.
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Respectfully, /s/ M. Dillon '87 124.193 (300TD) "White Whale", ~392k miles, 3.5l IP fitted '95 124.131 (E300) "Sapphire", 380k miles '73 Balboa 20 "Sanctification" Charleston SC
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#15
05-06-2019, 07:51 PM
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One thing I can chime in about is the braided hose which feeds the clutch hydraulic system. Its NLA from Mercedes although at some point, I believe recently, Mercedes created a better hose for this application. Instead of a rubber braided hose with no clamps at the ends, Mercedes made a new plastic hose with pressure fitted ends, on the left in the photo below. (The old braided hose is to the right)
 Part number: 25141119 ($21)  This hose is flexible and with both ends being identical, you simply slide either end of the hose through the firewall with one end and connect it to the clutch master cylinder first, by pressing it into the barbed fitting which you need to keep from the old hose:   The smaller end plugs into the clutch master cylinder (if it happens to come off while disconnecting the old hose) And then simply connect the other end of the hose to the barbed fitting on the brake fluid reservoir The hose, although $21 is very high quality and is the right part for the job. I wouldn't use anything else personally. Last edited by SonnyMorrow; 05-06-2019 at 08:01 PM.
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