1971 220D does not engage - Mercedes-Benz Forum

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post #1 of 11 (permalink) Old 01-19-2010, 04:19 PM Thread Starter
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1971 220D does not engage

hoping to find an answer to this one... as mentioned, 1971 220D manual. when a gear is selected power is not making it to the wheels. the speedometer registers as it would given the gear and rpm, but no power. i just crawled under the car a bit ago, and there is play in the driveline (forward and back). i assume this isn't kosher... unfortunately, i do not have a manual that goes into any useful detail.
what are your thoughts?
are there any online manual databases that would be useful?
thanks for letting me pick your brains!
kat
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post #2 of 11 (permalink) Old 01-19-2010, 04:54 PM
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So your speedometer rises as you rev the motor? If so, it sounds like some has broken inside the rear diff.

Pick up the entire rear end and spin one of the wheels, the opposite wheel should spin in the opposite direction.

'79 280CE with 226,000 miles
'76 240D 4 speed with 190,000
'85 300D Turbo with 266,000 miles


GONE but not forgotten
'76 300D with 195,300 miles
"83 300D with 174,000 miles

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post #3 of 11 (permalink) Old 01-19-2010, 05:09 PM Thread Starter
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yes, speedo thinks everything is normal. rises with revs. will jack it up and see where that finds me.
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post #4 of 11 (permalink) Old 01-19-2010, 05:21 PM
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Check out the rear end. Dumb question but are you sure your drive shaft is attached to the diff?

Whats the history on the car?

Rear diff failures are very rare, even more on a 220D which is so underpowered.

'79 280CE with 226,000 miles
'76 240D 4 speed with 190,000
'85 300D Turbo with 266,000 miles


GONE but not forgotten
'76 300D with 195,300 miles
"83 300D with 174,000 miles

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post #5 of 11 (permalink) Old 01-19-2010, 08:02 PM
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I would doubt that the diff itself broke with 90ft lbs of torque. It does appear that the driveshaft fell apart.

1977 - W116 - 6.9
1974 - W115 - 240D /8 - 4(M) OM617.910 + Turbo + 300D FW - Completed 7/8/10
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post #6 of 11 (permalink) Old 01-20-2010, 09:55 AM
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Speedo moves when you rev it? Or tachometer?
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post #7 of 11 (permalink) Old 01-20-2010, 10:50 AM Thread Starter
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speedo. the car ran and drove fine, apparently a little whine coming from the area of the shifter. was driving home one day on the freeway, all was well, decelerated, when he reapplied the gas he found no power behind it. there were no noticeable breaking noises. although the feel of the shifter seems off to me.

can't tear into it too much myself until next week, but he says that the shaft is not turning. how possible is it for the shaft to come uncoupled from the tranny?

edit: was just under there, and it most certainly seems that the shaft and tranny have disengaged. what keeps them together? there is also a slight noise when the clutch is released, even in neutral. would love to get to the bottom of this...

Last edited by greasekat; 01-20-2010 at 01:37 PM. Reason: new info
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post #8 of 11 (permalink) Old 01-21-2010, 10:28 AM
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Ahhhhhhhh, OK. There's a hard nylon or rubber joiner between driveshaft pieces, isn't there? Maybe it finally crapped itself.

Although the thought of a diesel being punishing enough to do something like that does give one reason to laugh ...
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post #9 of 11 (permalink) Old 01-21-2010, 10:44 AM Thread Starter
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if you are referring to the flange to the rear of the tranny, it is still intact. it seems that the shaft has come loose from the trans. i found a chilton yesterday, but that was completely useless... are there any good schematics/parts blowups on the web? i have been searching, but coming up empty.
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post #10 of 11 (permalink) Old 01-22-2010, 05:39 AM
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tranny

I know its hard to believe but I broke a 4 spd tranny on a 220D the gearbox it stuck in reverse and broke the end of the shifter lever off right into the side of the tranny. i believe this happend because my linkage bushings were worn out and one of the other forward gears was still partially in gear. Then putting in reverse it froze.

Would it be possible the box ran dry and cracked off the end of the output shaft but inside the tranny?

I can't recall but i think that Yoke output shaft coming out of the tranny has a nut on it holding it in the end. This can be determined by disconnecting the flex disc from the back of the tranny. And try to pull out the three holed shaft from back of tranny by hand. If that came loose then the play on the short shaft would have let it slide back enough to lose grip on the spline inside tranny.

IF you Cannot do this, then while under car, with brakes on and safety supports in place. Put tranny in neutral and try to turn the drive-shaft. It should NOT spin. Then lift one tire, secure car from moving and release brake, then put in 1st or revers and try to spin tire with engine off. It should also NOT spin when in gear. Meanwhile checking the entire shaft up and down.

I could put money the fact that the yoke coming from back of tranny lossend and short shaft slid back and lost connection.


Check that




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