Can't Select Lower Gears Past "D4" - Mercedes-Benz Forum
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post #1 of 16 (permalink) Old 01-29-2012, 11:36 AM Thread Starter
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Can't Select Lower Gears Past "D4"

Hi, Group,

I rarely have a problem with my 97 S320, so I guess it's my turn!

A few days ago, I was decending a hill. I always select "3", or "2" to slow my speed.

This day, and presently, the shifter will not physically move into "D4", 3, 2, etc.

No Check Engine lights. While in the first "D", the normal drive-position, the transmission shifts normally, upshifts through the gears when accellerating, reverse operation is normal. Otherwise, my car behaves normally.


What's going on?



James Combs,
Salt Lake City, Utah
97 S320, 98,300 miles
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post #2 of 16 (permalink) Old 01-29-2012, 01:27 PM
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there is absolutely nothing to prevent it from moving.. the y66 solenoid will not lock that out and is the only lock in there

something broken and stuck in the shifter? idk what

have you tried to bump it harder into 4th?

vw phaeton. when vw copies mercedes, but forces you to service it next to golfs and jettas
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post #3 of 16 (permalink) Old 01-29-2012, 01:56 PM
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I'd guess something is binding up your shift linkage. It doesn't sound like anything going on inside the transmission, but I may be wrong.


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post #4 of 16 (permalink) Old 01-29-2012, 03:58 PM Thread Starter
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there is absolutely nothing to prevent it from moving.. the y66 solenoid will not lock that out and is the only lock in there

something broken and stuck in the shifter? idk what

have you tried to bump it harder into 4th?
I've "gently" pushed it to the left. It feels like some interlock thing; it's probably not anything that has fallen in the shifter.

I'll start it and try with a little more force. More later.


Jim
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post #5 of 16 (permalink) Old 01-29-2012, 04:09 PM Thread Starter
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Originally Posted by 97S320Jim View Post
I've "gently" pushed it to the left. It feels like some interlock thing; it's probably not anything that has fallen in the shifter.

I'll start it and try with a little more force. More later.


Jim
10 minutes later: Backed car out of garage. Put in "D4", AND with MORE force, it now shifts (now with resistance in all gear selection) normally.

This stiff-shifting thing must be that little shift bushing on the underside of my car, right, Gyrate?

The round bushing that gives that detent "feel", right?

Is it okay to drive for a half to a whole day?

Jim
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post #6 of 16 (permalink) Old 01-29-2012, 04:25 PM
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Quote:
Originally Posted by 97S320Jim View Post
10 minutes later: Backed car out of garage. Put in "D4", AND with MORE force, it now shifts (now with resistance in all gear selection) normally.

This stiff-shifting thing must be that little shift bushing on the underside of my car, right, Gyrate?

The round bushing that gives that detent "feel", right?

Is it okay to drive for a half to a whole day?

Jim
nope. it is a metal plate. there is a piston with a spring and a ball that pushes against the shift detent plate to give you the notches.

i apparently have thrown all my old shifters out but i found this plate. you can see the positions on it

it is possible the ball/spring jams. i had a few of these myself. also if it collapses, it does the opposite. the shift bushing will result in slack of the shift rod that you wouldnt feel in the shifter from D downward. PRN is a detent plate in the transmission itself that gives you notches. D4321 is the plate below. weird i know


vw phaeton. when vw copies mercedes, but forces you to service it next to golfs and jettas
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Last edited by gyrate; 01-29-2012 at 04:29 PM.
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post #7 of 16 (permalink) Old 01-29-2012, 05:13 PM Thread Starter
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nope. it is a metal plate. there is a piston with a spring and a ball that pushes against the shift detent plate to give you the notches.

i apparently have thrown all my old shifters out but i found this plate. you can see the positions on it

it is possible the ball/spring jams. i had a few of these myself. also if it collapses, it does the opposite. the shift bushing will result in slack of the shift rod that you wouldnt feel in the shifter from D downward. PRN is a detent plate in the transmission itself that gives you notches. D4321 is the plate below. weird i know

Do you get to this plate and bushing from inside the top of the shifter, or underneath the car, or within the transmission case, Gyrate?

Is it safe to drive? If I leave the shifter in the normal "D" drive-position, I'm I okay to drive it to my independent MB shop, Gyrate?

Nice pics, too.


Jim
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post #8 of 16 (permalink) Old 01-29-2012, 09:28 PM
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Originally Posted by 97S320Jim View Post
Do you get to this plate and bushing from inside the top of the shifter, or underneath the car, or within the transmission case, Gyrate?

Is it safe to drive? If I leave the shifter in the normal "D" drive-position, I'm I okay to drive it to my independent MB shop, Gyrate?

Nice pics, too.


Jim
inside the shifter, from inside the car. whole shifter comes out

you can drive it indefenitely. as long as its not loose in D it wont burn out the selector switch.

vw phaeton. when vw copies mercedes, but forces you to service it next to golfs and jettas
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post #9 of 16 (permalink) Old 01-29-2012, 10:48 PM Thread Starter
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I was getting the inch to drive it again.

Back out of garage: shifter NOW smooth again, put into "D", smooth, sure feel to the engagement. Drove 30 minutes. Fast, slow, forcing downshifts on steep hills near my neighborhood.

Pulled into garage. The shifter was as smooth as if nothing was wrong.

But, I didn't "force" it back into "D4" or lower...

About how much for this kind of repair, Gyrate?

Does just the black regtangular bezel around the shifter need to be removed for access, or does all of the wood come out (!!!!)?


I never had any kids, Group; my 97 S320 IS my kid! I'm worried like a parent would be.



James Combs,
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1997 S320, 98,200 miles
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post #10 of 16 (permalink) Old 01-30-2012, 02:29 AM
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Quote:
Originally Posted by 97S320Jim View Post
Pulled into garage. The shifter was as smooth as if nothing was wrong.

But, I didn't "force" it back into "D4" or lower...

Does just the black regtangular bezel around the shifter need to be removed for access, or does all of the wood come out (!!!!)?
Read more about the shifter here;
Center Console Shift

So, if its a problem with the shift disengagement mechanism, or just the
D4-3-2-1 shift detent, it does not have to affect your experience in the
P-R-N-D range, since its a intra-shifter-thing,
and nothing to do with the actual gearbox.

Yes, the wood must come out to get the shifter out (at least my experience)

br,
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