lumbar pump repair
 

In the past there were many posts on the ZR-1 net on how to repair the lumbar pumps using a piece of rubber glove. Need help in locating the repair proceedure or a description of the method. Thanks Doc

Re: lumbar pump repair
 

Here ya go..did my 90 works good as long as the bags and fittings are good...This came from Corvette Forum under the C4 tips..

This tip provides additional information to the Tech Tip "FIXING YOUR C4 SPORT SEAT LUMBAR SUPPORT" authored by Bob Thibodeau on 6/15/2001. 1. An alternative source for material to replace the ruptured diaphragm is a bicycle inner tube. It is much thicker than the original diaphragm, and should provide longer "life". To prepare the tube, cut a square about 2" X 2". Locate the center of the square by intersecting the lines from each corner. This will provide the location for the center screw. If the screw is off center, you will develop a "rolling pulsation" , which is not as efficient as a "verical pulsation". 2. Using a compus placed at the center mark, draw a circle 11/4" in diameter. Cut out your circle precisely, and now you have your diaphragm replacement. 3. The pump is held in positon by three bolts. The heads of the bolts are located under the seat, and the nuts are recessed on the top, which requires removal from the under side of the seat. 4. When reinstalling the pump, it is recommended to replace the bolts with screws and self locking nuts. Installing the screws from the top will allow you to use a screw driver for ease of installation. I found that when using self locking nuts, only two were required to sufficiently fasten the pump to the seat. With the "inner tube" replacement diaphragm, I am able to compare pump production with the original diaphragm in the passenger seat. The inner tube diaphragm provides a more rapid inflation of the lumbar bladder.

Re: lumbar pump repair
 

We gone u are so resouceful!!! Good going!!!

Re: lumbar pump repair
 

Thanks for the info. Doc

Re: lumbar pump repair
 

Welcome Marvin:handshak: , glad to see you posting. :thumbsup:

:cheers:

Re: lumbar pump repair
 

yes welcome.... mr marvin!!

Re: lumbar pump repair
 

I've got an intersting problem/question. My lumbar pump works fine, and all three center bladders are working. The problem I have is one of the side bolsters doesn't work. I've had the seat base off, and swapped the hoses so it's not a problem with that particular "port" under the seat, but a problem with the line/bladder itself. Any thoughts on the best way to tackle this? How hard is it to get to the "guts" of the seat and see what's happening?

Re: lumbar pump repair
 

Re: lumbar pump repair
 

Even on the sport seats on a '94? Looked like air tubes going to both sides, and only one side works. I swapped the connections, so it's not that "port" on the under seat unit, it's in the seat itself.

Re: lumbar pump repair
 

Well you got me on that one I know they are up to 93..and on my 04..I'll look in the parts book when I get home.

OK, you are right the book shows bladders for the sides on the newer style seats. The older ones are powered by an elec. motor.

Steve