Sunday, July 19, 2009

Wiper Motor Repair

I haven't had working wipers in the coupe for a few years now, so thought I try to remedy that. Often just a shot of Marvel Mystery Oil will cure the problem of dried out leathers. I disconnected the hose at the manifold, stuck it into a paper cup of MM oil, then moved the wiper blades by hand hoping I might suck some up there. No luck with that.

That meant taking the motor out, not a fun job, especially with the car having a radio. First, I disconnected the battery, knowing from experience that the transmission arms would drop down on the light switch, shorting something out for sure. Then, with a light shining up there and a long shafted screwdriver, I stuck my head down on the floorboards, with feet up over the seat (this gets harder every year). I disconnected the two transmission arms, being careful not to stretch out the spring clip that holds them to the motor. Then I removed the two mounting screws. Getting them out was pretty easy, as was working the motor out of there.

From 1936 Pontiac Restoration

I poured a little MM oil in the vacuum inlet and worked the action to get it down where it needed to be. Then I took off the on/off linkage plate on the front side to see if it might be jammed up and it wasn't (if it was, I'd spray it with WD-40). I then hooked the motor up to the manifold hose off the engine to see if it worked. Bingo, it worked great. Now I had to get it back in.

First, working from the right side looking up, I got the motor in position with the on/off lever in the correct [engaged]position, then I mounted the screw. There is just enough room on this side to make that possible.

But no way was I going to be able to get the left side screw in. That required taking the glove box out, not particularly hard, but an extra step. That exposed the mount very clearly and made it easy to get the screw in.

I had also noticed that the fit of the hose over the inlet elbow was looser that I like. Even though the wipers worked fine with the motor hooked up, I left the g-box out until I can get a hose that fits a little tighter. That makes it a two-part job, but better to do it only once eh? [Always to check first to see if the hoses are the problem. They can collapse under vacuum.]

If doing this again, I'll just take the glove box out first to give me more room under there to start with.


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