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  #1  
Old 08-05-2012, 10:51 AM
JamesDean's Avatar
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Quote:
Originally Posted by BoiseBenz View Post
It is absolutely not the b2. That keeps the car from moving forward. it's more likely valve body, governor, stuck kickdown solenoid, etc.
I beg to differ. Here's my past experience with my 300SD..

I supposed I could check the kick down solenoid though, How does one check to see if its stuck exactly? I've disconnected the switch for it.

300SD Transmission Dead...

From the ATSG Manual:


B2 is engaged during 1,2,3 gears if I'm reading that correctly..
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Last edited by JamesDean; 08-05-2012 at 11:02 AM.
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  #2  
Old 08-05-2012, 11:17 AM
Stretch's Avatar
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Quote:
Originally Posted by JamesDean View Post
...
B2 is engaged during 1,2,3 gears if I'm reading that correctly..
Indeed - but if you had a 100% dead B2 piston then wouldn't you be saying "I can only get reverse"? First gear works doesn't it?
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  #3  
Old 08-05-2012, 11:26 AM
JamesDean's Avatar
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Quote:
Originally Posted by Army View Post
Indeed - but if you had a 100% dead B2 piston then wouldn't you be saying "I can only get reverse"? First gear works doesn't it?
I was re-reading my 300SD post and it seems that I was able to eventually get the car into 2nd gear? I dont remember this but I wrote it..

First gear and reverse work fine. Quick to engage and responds fine.

Maybe the Kickdown solenoid is stuck? How would I go about freeing it? I don't have any spare to install in its place... I've disconnected it at the switch end.

I'll double check the bowden and vacuum cable connections at the transmission end however I doubt its the vacuum since I've had the 300SD disconnected a number of times for diagnostic purposes and the transmission has always upshifted fine. Hard and firm, but fine.

Also found this thread with some good information:
'91 300D trans stuck in 1st gear...

I'm thinking maybe I could cobble together a gauge and check out the trans pressure.. Maybe like the above linked thread something is up with the regulating pressure/governor?

I believe I read in another thread that its either 8mm or 12mm. Someone else posted that the banjo fitting from the 617's boost line to alda would work..



Is the "shift valve housing" the valve body? I can't seem to find the charts/tables they are referring to with regards to regulator pressure hm..
__________________
Cruise Control not working? Send me PM or email (jamesdean59@gmail.com). I might be able to help out.
Check here for compatibility, diagnostics, and availability!

(4/11/2020: Hi Everyone! I am still taking orders and replying to emails/PMs/etc, I appreciate your patience in these crazy times. Stay safe and healthy!)


82 300SD 145k
89 420SEL 210k
89 560SEL 118k
90 300SE 262k RIP 5/25/2010
90 560SEL 154k
91 300D 2.5 Turbo. 241k
93 190E 3.0 235k
93 300E 195k

Last edited by JamesDean; 08-05-2012 at 11:58 AM.
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