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  #1  
Old 10-26-2009, 06:54 AM
Mercedes Benz Diesel Doc
 
Join Date: Apr 2008
Location: Southern Spice
Posts: 26
1984 300SD transmission problem

Hello All,

My Helga was running like a top.

But just this morning, when I was in the process of going up a steeped road from a full stop. I noticed that my beloved Helga was revving but was not able to move up. I moved the shift lever from D to 2 and she was able to climb the hill.

What problem am I having now? I changed the tranny fluid a year ago together with the tranny filter.

Is this vacuum or b2 piston related?
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  #2  
Old 10-26-2009, 07:40 AM
Admiral-Third World Fleet
 
Join Date: Feb 2002
Location: Central FL
Posts: 3,068
Yes...or it could be something else, too..

Tell us more. How many miles on your transmission? Any other symptoms?

I doubt that it is vacuum related..
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  #3  
Old 10-26-2009, 01:28 PM
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Join Date: May 2009
Location: Salt Lake City, UT
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Quote:
Originally Posted by Scout-Ranger View Post
Hello All,

My Helga was running like a top.
Off topic but name stealer !!

Back to topic sound like more of a vacuum issue to me but i am experiancing tranny problems myself that i am unable to remedy as of yet.
Best of luck.
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  #4  
Old 10-26-2009, 02:53 PM
Actros617's Avatar
Ich fahre dieseltypen
 
Join Date: Apr 2008
Location: Oklahoma
Posts: 1,103
It's most likely that you have to adjust the bowen cable and the transmission vaccum moduel that us located omthe side of the transmission by the driver sideit has a t key. I suggest to use a vaccum gauge. It must fall between 15 to 20 mmhg at idle and should fluxuate during shift I am not sure how much. Google transmission vaccum adjustment. You'll get more info.
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  #5  
Old 10-26-2009, 11:37 PM
Mercedes Benz Diesel Doc
 
Join Date: Apr 2008
Location: Southern Spice
Posts: 26
Had 210k miles on the tranny

Quote:
Originally Posted by polarisrmk View Post
Off topic but name stealer !!

Back to topic sound like more of a vacuum issue to me but i am experiancing tranny problems myself that i am unable to remedy as of yet.
Best of luck.
All Helgas are good lookers

I'm isolating the problem since if I purchase parts, it would be coming stateside and I do not want to waste any resources

Would it cause any damage mechanically to drive a car with a broken b2 piston?
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  #6  
Old 10-27-2009, 01:56 AM
tbomachines's Avatar
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Check the fluid level again before you jump to any conclusions. I've seen multiple times (in my short time here) people replace the B2 when it is just showing symptoms of low fluid....not necessarily your case but check the level and make sure.
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  #7  
Old 10-27-2009, 03:24 AM
Mercedes Benz Diesel Doc
 
Join Date: Apr 2008
Location: Southern Spice
Posts: 26
Copy That!

Quote:
Originally Posted by tbomachines View Post
Check the fluid level again before you jump to any conclusions. I've seen multiple times (in my short time here) people replace the B2 when it is just showing symptoms of low fluid....not necessarily your case but check the level and make sure.
I will keep you posted on the latest developments
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  #8  
Old 10-27-2009, 05:31 PM
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Join Date: Jan 2007
Location: Kentucky
Posts: 405
My 300D sometimes does the same thing. Since it has never become a real problem (I just downshift or floor it) I have not worried about it. Had always guessed it was a glitch concerning vacuum and the transmission just couldn't decide which gear it wanted to be in. Not a very professional assessment, but it has never become a problem either. It has done this for years and only happens on occassion.
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  #9  
Old 10-28-2009, 03:45 AM
Mercedes Benz Diesel Doc
 
Join Date: Apr 2008
Location: Southern Spice
Posts: 26
Update!

Quote:
Originally Posted by tbomachines View Post
Check the fluid level again before you jump to any conclusions. I've seen multiple times (in my short time here) people replace the B2 when it is just showing symptoms of low fluid....not necessarily your case but check the level and make sure.
I check the tranny fluid on ambient shop temp and it was in between the two lines on the dipstick.

I checked again the tranny fluid based on the owners manual instruction. So, after idling Helga for 5 minutes. I checked the dipstick after initially wiping it off and then re-inserting it back again with the lock on the release position. Lo and behold, I was surprised that the fluid level was way below the minimum line.

I added a quart of tranny fluid and the shifting went back to the way it was before and it was definitely smoother.

I tried Helga on an uphill sloped from full stop and she climbed it with ease

Thank you all for your help here. I really learned something from this ordeal and that is to check the fluid level as instructed in the manual and to checked fluids regularly.
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