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  #1  
Old 01-30-2008, 05:21 PM
katchung's Avatar
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I need a seat back locking vacuum element for a 300cd

I pulled the passenger seat today and one of the two seat back vacuum locking elements doesn't hold vacuum...therefore that side doesn't lock.
A. How do I get it out...screws are facing the bottom of the seat.
B. Anybody have one they are willing to part with?
C. Am I crazy for trying to fix this? Any suggestions on how to remove the actuator?

Thanks

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  #2  
Old 01-30-2008, 11:19 PM
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Continuation of above post

So after work today i took the passenger seat out and took off the upholstery on the bottom. I removed the faulty seat back locking vacuum element. I was surprised to find that the membrane looks like bicycle inner tube when it was cleaned with soapy water. It has a small hole, like a flat tire on it. Question is, could I use a bicycle tire repair kit to repair the membrane? Is there anything i could spray on the rubber to reinforce the entire membrane? Silicone maybe? Rubber glue? Any suggestions?

Thanks for any input.
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  #3  
Old 01-31-2008, 06:07 AM
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This pdf may help. Sounds like the fix you suggested, inner tube repair, should work.
Click on the buy parts tab on top of the page, and ask Phil.
Attached Files
File Type: pdf seat back vac.pdf (58.1 KB, 166 views)
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  #4  
Old 01-31-2008, 08:38 AM
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Thanks Bob

I'm going to try an inner tube repair kit first before purchasing new element. This car needs so much, and I have to save in my yearly budget in case something really really expensive needs fixing. Worst case scenary I'll take some wire and wire the seat back hook permanently locked if I can't get it to work with the vacuum.

Have you used Diesel Giant and his videos? Thinking about getting the valve adjustment and cover gasket repair DVD.
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  #5  
Old 01-31-2008, 09:31 AM
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George Murphy sells replacement diaphragms. I don't know if they fit that particular module. Search on his name on the forum and his phone number will come up. He doesn't have a website. He could tell you if the diaphragms fit. They are not expensive.
I'd be inclined to use a small glob of Goop to repair the existing one, rather than a tube repair kit.
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  #6  
Old 01-31-2008, 12:37 PM
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Thanks Kerry. Wish I'd gotten your reply before i bought the rubber repair kit and patched the hole...I'll know soon enough if it holds...worse case scenario is it holds, I put the seat back together and in the car, and it fails a month from now.
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  #7  
Old 01-31-2008, 04:49 PM
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Inner tube repair failed. It held seal until I reattached the element to the seat and locking mechanism. I'll have to go find some goop tomorrow and see if that will hold. If that doesn't work I'll seek out George Murphy.
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  #8  
Old 01-31-2008, 07:38 PM
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katchung,

i have one from a 1991 W124 donor car from my rust repair project. would that work with your car?

bob
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  #9  
Old 01-31-2008, 09:01 PM
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Quote:
Originally Posted by katchung View Post
Inner tube repair failed. It held seal until I reattached the element to the seat and locking mechanism. I'll have to go find some goop tomorrow and see if that will hold. If that doesn't work I'll seek out George Murphy.
Sorry to hear!
Good luck.
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Old 01-31-2008, 09:55 PM
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forgive my ignorance but what exactly is the purpose of locking the seat back with vacuum? is this a way to trap passengers?
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  #11  
Old 01-31-2008, 09:59 PM
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without the seatback lock the driver and passenger seat backs are not locked in place...in an accident you would be thrown forward into the dash strapped in or not.
Here's a picture of it.

Thanks
Attached Thumbnails
I need a seat back locking vacuum element for a 300cd-photo_01.jpg  

Last edited by katchung; 01-31-2008 at 10:11 PM.
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  #12  
Old 01-31-2008, 10:05 PM
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seat back lock purpose

without the seatback lock the driver and passenger seat backs are not locked in place...in an accident you would be thrown forward into the dash strapped in or not.
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  #13  
Old 01-31-2008, 10:15 PM
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Quote:
Originally Posted by katchung View Post
without the seatback lock the driver and passenger seat backs are not locked in place...in an accident you would be thrown forward into the dash strapped in or not.

ok, but why with vacuum? they have a release button, why not a lever like everyone else?, why complicate a seat back with a vacuum actuator? just wondering if there is some other thing it accomplishes
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1982 300CD Turbo (Otis, "ups & downs") parts for sale
2003 TJ with Hemi (to go anywhere, quickly) sold
2001 Excursion Powerstroke (to go dependably)
1970 Mustang 428SCJ (to go fast)
1962 Corvette LS1 (to go in style)
2001 Schwinn Grape Krate 10spd (if all else fails)
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  #14  
Old 01-31-2008, 11:15 PM
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Quote:
Originally Posted by lutzTD View Post
ok, but why with vacuum? they have a release button, why not a lever like everyone else?, why complicate a seat back with a vacuum actuator? just wondering if there is some other thing it accomplishes
Gotta keep the engineers busy!
I don't know, redundant, I assume.
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  #15  
Old 01-31-2008, 11:29 PM
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Neither of the vacuum seat locks work on my coupe either. Eventually I'll have to pull the seats and fix them somehow. This was a "luxury" car, and who would want to press a button to unlock seats when vacuum can do the job for you in 1977?

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