whats the deal with my 76 240d flywheel? - Mercedes-Benz Forum

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post #1 of 13 (permalink) Old 01-06-2011, 08:26 PM Thread Starter
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whats the deal with my 76 240d flywheel?

...today it was warm enought to work in the garage so i pulled the transmission and the old clutch assembly and then took the flywheel off. i have a hub attached to the flywheel that is similar to a brake drum hub and the plate of the flywheel is surrounded by this hub.

i looked to see how and or if it comes off but this does not compute. can someone tell me if how this hub comes off? i dont see any bolts that i can remove to get this cast iron hub off the flywheel. i cant see how it could be refreshed with this hub on it. i expected to have just the actual fly with both side visible but this is not the case.

can anyone educate me on this please? i was going to take it to a machine sop tomorrow just to freshen it up but ive never seen this before.
thanks in advance.

eta: this is A W115 1976 240D
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post #2 of 13 (permalink) Old 01-07-2011, 03:42 AM Thread Starter
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...ok, so nobody knows or nobody wants to help? which one is it?
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post #3 of 13 (permalink) Old 01-07-2011, 06:01 AM
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That's part of the flywheel. It doesn't come off. Unless it is scarred or extremely heat cracked there is no reason to have it resurfaced.

I know, I know, it goes against everything you have been taught about clutch replacement but it's true.

The milling machine the machine shop uses is capable of re-working the surface if needed.
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post #4 of 13 (permalink) Old 01-07-2011, 06:15 AM Thread Starter
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...thank you for you response, ive never seen one like this. i will upload a pic in the next few minutes, if i can clean it up with emery paper, id be ok with that. im going to grab my camera and post a pic, id like you folks to see the surface.
many thanks
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post #5 of 13 (permalink) Old 01-07-2011, 06:30 AM Thread Starter
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...i dont feel any ridge or grooves in it at the finger tips. i havent used a feeler guage and a straight edge on it, i can actually see my reflection in it in in present condition. any thoughts are the pics good enough> i can take more when the sun comes up if the camera flash is not helping.
thanks everyone







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post #6 of 13 (permalink) Old 01-07-2011, 08:57 AM
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I'd slap it back together. Emery cloth isn't going to do anything to it but leave grit in the surface. A good cleaning with brake clean or something and stick it back into place.
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post #7 of 13 (permalink) Old 01-07-2011, 10:35 AM Thread Starter
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...ok, thanks.
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post #8 of 13 (permalink) Old 01-07-2011, 10:51 AM
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Notice the RMS surface finish on new parts.

If there are no heat cracks

I re-surface the flywheel and pressure plate with 60 grit emery cloth and a 12lb brick sized piece of brass. this will take the shine off and restore original gripping (to a point) sure it will re-smooth after time. also I do the brake rotors the same way. The grit will clean off with solvent followed with simple green and water rinse.
( Retired Machinist) (made lots of new parts )

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post #9 of 13 (permalink) Old 01-07-2011, 12:37 PM Thread Starter
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Quote:
Originally Posted by bostosh View Post
Notice the RMS surface finish on new parts.

If there are no heat cracks

I re-surface the flywheel and pressure plate with 60 grit emery cloth and a 12lb brick sized piece of brass. this will take the shine off and restore original gripping (to a point) sure it will re-smooth after time. also I do the brake rotors the same way. The grit will clean off with solvent followed with simple green and water rinse.
( Retired Machinist) (made lots of new parts )
...nice looking benz you have there sir.

i went to a reputable mercedes parts guy today here in town, i needed a bushing for a shift lever (4 on the floor) and a couple of bolts so i brought the flywheel with me. he also noted that it was free of ridges ect as i mentioned. i asked him if i should use some emery paper but he ended up telling me to clean it with some steel wool and call it good because in his opinion refreshing it at a machine shop was pointless.

im glad you guys are here and sharing information. thanks again!
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post #10 of 13 (permalink) Old 01-09-2011, 08:03 PM
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balance flywheel

I have a 82 240d. Is the engine balanced by drilling the flywheel on a standard? I have read a lot of conversations in forums about the balancing of the flywheel and not getting a clear answer. some say flywheel is neutral balance. my flywheel has holes drilled into it aparently to balance it. the difference in depth of these holes is big, couldn't imagine it wouldn't matter.
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