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  #1  
Old 10-13-2022, 10:44 AM
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Dirty Differential

Hello to all..

The bottom of my 1971 250c is clean everywhere except for the differential. The differential is very dirty with road grime.

I don't believe this is from a leaking seal or the diff cover which is for sure leaking. There is no oil or dirt anywhere else. Not on the u-joints, axles or on the drive shaft.

It appears to me that a differential was swapped and not cleaned before doing so.
Why someone would do that is a mysterie to me.

I am going to drop the differential, change the mount and clean it up. Then pull the differential cover,clean it and seal it.

I will be looking for the differential part number but I was also wondering if I could determine the ratio by counting the teeth on the ring and pinion? If the gear ratio has changed I'd like to know.
Thank you
Gary

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  #2  
Old 10-13-2022, 11:25 AM
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The ratio is stamped into the lower left corner of the case, looking from the rear.
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  #3  
Old 10-13-2022, 08:19 PM
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Thank you sir!
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  #4  
Old 10-14-2022, 10:17 AM
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Just as a "head's up", the differential number is stamped using the metric numbering system, e.g., 3,45 as opposed to U.S. standard 3.45
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  #5  
Old 10-15-2022, 12:18 PM
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Id be surprised if it is not leaking, they are notorious for that as they age , check the drain plug and dif seal once you clean it up . It does not take much of the heavy weight oil to make a mess
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  #6  
Old 10-17-2022, 03:44 PM
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Are you talking about leaking past the seals or the cover? The cover is for sure leaking, wet at the seam.

The fluid came out clean, a deep maroon color.

What's odd is that everything except the differential is really clean. The lid of the vent at the top of the diff is caked on, the sheet metal above it is is perectly clean.. Nothing on the axels, ujoint or drive shaft.

Nice black paint under grease.
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  #7  
Old 10-17-2022, 03:50 PM
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The grease was so old, it came off in ribbons, like stripping heavy paint.
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  #8  
Old 10-17-2022, 09:33 PM
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pictures would help us help you
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Ron
2011 Porsche Cayman - Bond,James Bond
Sadly MERCEDESLESS - ALways LOOKING !
99 E320 THE Queen Mary - SOLD
62 220b - Dolly - Finally my Finny! Sadly SOLD
72 450SL, Pearl-SOLD
16 F350 6.7 Diesel -THOR
19 BMW X5 - Heaven on Wheels
14 38HP John Deere 3038E Tractor -Mean Green
84 300SD, Benjamin -SOLD
71 220 - W115-Libby ( my first love) -SOLD
73 280 - W114 "Organspende" Rest in Peace
81 380 SL - Rest in Peace
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  #9  
Old 10-18-2022, 03:23 PM
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Too late.. I have already cleaned it up. I am pulling the back cover tonight and sealing with an anaerobic sealer. Then refilling and moving on.
Thanks.. Gary
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  #10  
Old 10-18-2022, 03:27 PM
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good!
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..I also have a 427 Cobra replica with an aluminum chassis.
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  #11  
Old 10-18-2022, 11:02 PM
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Good idea and good luck. Keep us posted. Like to hear good story endings
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2011 Porsche Cayman - Bond,James Bond
Sadly MERCEDESLESS - ALways LOOKING !
99 E320 THE Queen Mary - SOLD
62 220b - Dolly - Finally my Finny! Sadly SOLD
72 450SL, Pearl-SOLD
16 F350 6.7 Diesel -THOR
19 BMW X5 - Heaven on Wheels
14 38HP John Deere 3038E Tractor -Mean Green
84 300SD, Benjamin -SOLD
71 220 - W115-Libby ( my first love) -SOLD
73 280 - W114 "Organspende" Rest in Peace
81 380 SL - Rest in Peace
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  #12  
Old 10-19-2022, 04:00 PM
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When I bought the car it would idle, but wouldnt take fuel. I pulled the filter and fuel coming from the tank was orange. I had the tank boiled then painted and installed. Replaced all fuel hoses.
The fusebox was a mess, little pieces of burnt fuses lying across terminals deep inside. I disassembled it all, used Deoxit and cleaned all the connections. Installed new ceramic fuses.
I didnt have a battery so I bought a group 49 Interstate (the only place that had one) andI am painting the Rusty Battery tray this weekend.
The diff cover is going on tonight and the fluid with it.
If I get away without rebuilding the carbs, I will try to drive the car Monday evening.
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  #13  
Old 10-22-2022, 06:40 PM
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Location: Rockford IL
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Diff Mount Screw Torque

I am looking for the bolt torque for the differential cover plate to the differential mount.
The cover torque (45nm) and the mount body to chassis torque (25nm) I have found.
I cannot find the cover to mount bolt torque.
My MB Workshop Manual only lists the torque for the cover end mount which is not the same mount as mine.
I have included a pic of the mount in question. The bolt is a single 14mm Hex Head Bolt.
Thanks.. Gary
Attached Thumbnails
Dirty Differential-20221022_163312.jpg  
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Last edited by glmoore0001; 10-23-2022 at 06:06 AM. Reason: cleaning up writing
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  #14  
Old 10-23-2022, 06:01 AM
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Diff is (almost) Finished

Everything for the differential was cleaned and ready to go.
I was really impressed with the Hylomar Anaerobic Sealer. I applied it to both surfaces with my finger, let it set for about 15 mins per instructions. When I put the parts together, without any bolts at all there was no movement of the cover when I removed my hands. Sticky Stuff! Torqued to spec, wiped off the squeeze out and done.
I still am unsure of the torque of the 14mm hex bolt holding the diff to the mount on the chassis. I ended up putting 60 ft lbs on it only because I had no idea of the actual figure. I have a MB Technical Data Manual coming, maybe it will be listed in there.
1 bottle of Lucas 80\90, and topped off with Lucas Heavy Duty Oil Stabilizer per a Pierre Hedary video.
I am going to have to wait to replace the boots on the axels, I expect snow to be flying at anytime here in Northern Illinois. Gary
Attached Thumbnails
Dirty Differential-diff1.jpg   Dirty Differential-diff4.jpg   Dirty Differential-hylomar.jpg  
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  #15  
Old 10-23-2022, 11:25 AM
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1966 250SE Coupe Owner
 
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Nice work. I'm sure 60ft/lb will be just fine on a bolt that large. You can also use blue loctite on bolts like this, for a little added piece of mind, and it won't make it difficult to remove in the future.

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