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  #1  
Old 03-18-2015, 02:42 AM
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grinding gears, 1-2 shift pattern

my car has a 240D flywheel between the 617 turbo and iron box 4-speed, and the very early chassis clutch pressure system. with the clutch fully disengaged, shifting rapidly from 1st into 2nd, both my past and current transmissions have ground gears. if i take the time to shift from 1st into neutral and then from neutral into 2nd, there is no problem. none of the other manual shift cars i've driven have had this behavior, so i mean to ask, is it normal?

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'77 240D, 504H, OM617.952, etc.
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  #2  
Old 03-18-2015, 08:09 AM
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No, sounds like the syncro-mesh is worn out for 2nd gear.
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  #3  
Old 03-18-2015, 11:14 AM
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Our 80 240D will do that shifting into 2nd. I hesitate in the shift, and she goes in ok.

We do have 374k on the trans, and things do wear out.

I was searching last night for MB synchros, and didn`t find any.

Charlie
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there were three HP ratings on the OM616...

1) Not much power
2) Even less power
3) Not nearly enough power!! 240D w/auto

Anyone that thinks a 240D is slow drives too fast.

80 240D Naturally Exasperated, 4-Spd 388k DD 150mph spedo 3:58 Diff

We are advised to NOT judge ALL Muslims by the actions of a few lunatics, but we are encouraged to judge ALL gun owners by the actions of a few lunatics. Funny how that works
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  #4  
Old 03-18-2015, 12:13 PM
t walgamuth's Avatar
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Location: Lafayette Indiana
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yep. take your time and the tranny still has decades in it.
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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.
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  #5  
Old 03-18-2015, 01:45 PM
Fulcrum525's Avatar
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Location: CT
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Syncro gears for sure.

My truck does the same exact thing. I recall reading a few hears back that the 1st-2nd gear synchros are almost always the first to wear out.
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  #6  
Old 03-18-2015, 05:09 PM
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A dragging clutch is one possible cause, too light a trans oil will do this also. And the trans could just be wearing out , shift slower and it will continue to work for quite a while.
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  #7  
Old 03-18-2015, 08:00 PM
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thanks folks! sounds like there's nothing to do about it for now.
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  #8  
Old 03-18-2015, 10:05 PM
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Location: Out in the Boonies of Hot, Dry, Dusty, Windy Nevada
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Going to have to stop all that speed shifting visualizing that you are in a Corvette.


Charlie
__________________
there were three HP ratings on the OM616...

1) Not much power
2) Even less power
3) Not nearly enough power!! 240D w/auto

Anyone that thinks a 240D is slow drives too fast.

80 240D Naturally Exasperated, 4-Spd 388k DD 150mph spedo 3:58 Diff

We are advised to NOT judge ALL Muslims by the actions of a few lunatics, but we are encouraged to judge ALL gun owners by the actions of a few lunatics. Funny how that works
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  #9  
Old 03-22-2015, 03:09 PM
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I agree with the clutch as well as the synchromesh - but it is also worth considering rod lengths - alignment of rod positions in neutral (bolt special tool through the holes in the shifter out put) - rod bushings - gear box oil type and level (!) - and the condition of the shifter before you start taking the gearbox to pieces...

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