"Basics of Basics" Convertible Top pump/motor disassembly and rebuild
“Basics of Basics” Convertible top pump/motor rebuild
By Brian Martin
This “Basics” is more about demystifying the convertible pump system than anything else. I got the pump/motor back in my car and working so fast and with such excitement that I didn’t take any photos at all. So in deciding to put together a little “Basics” on the subject I just went and snapped some shots of the extra pump/motor I had. When I decided to pull mine apart I did a little google search and found nothing what so ever, thus the need for this “Basics”.
Where it all began…..I was putting my 1965 Buick Gran Sport convertible back together after about 12 years apart. Everything was finished on the car and being I am no mechanic I did the body and paint and left the convertible top stuff for the very end. To tell you the truth, I was pretty intimidated by it, but finally dug into it. The first thing I did was to install the rams that I purchased 12 years ago. The system worked when I pulled it apart and I forget why I even bought the new rams but I had them non-the-less. I got the motor and lines out of the rafters and blew out the lines with compressed air after removing them so I wouldn’t be dripping brake fluid all over my beautiful paint. I installed the rams and pump/motor and put in some new brake fluid (I HATE working with this stuff around paint!) and hit the switch……nothing. I mean nothing what so ever, not even a sound. After some diagnosis work I determined the pump/motor was the problem so I started thinking about buying a new one, which I found out was a off shore “generic” and I wasn’t going to have any part in that. And me being cheaper than snot I figured, I would pull the thing apart and see what it’s all about. I had a spare (a little newer, it had a rubber fill plug instead of the screw the original had) and decided to learn on the spare. These photos are of the original pump/motor so you will see the screw in fill plug in photo #2. We start with photo #1, these are the two bolts that hold the motor onto the pump. They are a ¼” headed bolt about 4 inches long that goes right past the magnets on the sides of the armature and screw into the pump body.
In photo #2 you can see the standard screw driver headed fill plug and the bolt that holds the reservoir to the pump. It’s simply an approx 3” long bolt that goes thru the middle of the reservoir into the pump. That bolt head looks pretty odd but a regular 11/16 open end wrench works on it.
The reservoir has a large O ring that seals it, (seen in photo #16) and a small O ring at the head of the bolt. (Photos# 16 & 17). When you remove that bolt and pull the reservoir off you will find the top of the pump as seen in photo #3. Remove the five quarter inch 7/16” headed bolts and you will have photo #4 and the pump it’s self photo# 5. You my have noticed if you looked at the photos that there is no gasket, it simply bolts right to the pump with the two aluminum surfaces being perfectly flat.
Last edited by MARTINSR; 04-19-2012 at 12:34 AM.