[mmcintee1985@gmail.com]

Hi does anyone know how the wiper arms come off on 1989 3100 open. They appear to be a spline and press fit but not sure if there is a hidden catch to lock so can wiggle and release. No way to put a puller on as the top is closed. Thanks for any help!

[cp4000]

I have a 1988 3300 Open so probably very close. There is a like a wire "C" clip in the wiper arm under a very thin washer which keeps it in place. I believe that "C" clip should release when force is applied to take it off. Those are on there pretty good so I normally gently pry it off with a flat blade screwdriver but that damages the washer which holds the clip. I was able to find a few new ones on Ebay and the first time I took it back off to adjust the position, the washer broke off. Mine are currently just pressed back on with technically nothing to secure it. I don't like leaving it that way but they do attach themselves pretty good so I am not too concerned at the moment. Would love to hear any other experiences out there...

[mmcintee1985@gmail.com]

I have a 1988 3300 Open so probably very close.  There is a like a wire "C" clip in the wiper arm under a very thin washer which keeps it in place.  I believe that "C" clip should release when force is applied to take it off.  Those are on there pretty good so I normally gently pry it off with a flat blade screwdriver but that damages the washer which holds the clip.  I was able to find a few new ones on Ebay and the first time I took it back off to adjust the position, the washer broke off.  Mine are currently just pressed back on with technically nothing to secure it.  I don't like leaving it that way but they do attach themselves pretty good so I am not too concerned at the moment.  Would love to hear any other experiences out there...

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Hi thanks for the help. So this C clip is on the post between the motor retaining nut and wiper arm spline? Or under the arm where it lifts up and down.

[hiccup]

There were a lot of different styles over the years. I had a boat from that vintage and I remember I had to remove/destroy the part that was covering the access to the arm/shaft. After that I was able to get a small puller on it and get it removed. That was a long time ago, and from what I remember, the shaft was knurled and the arm was really on there--it may have been a spline but my best recollection is a knurl. It wouldn't shock me if you had to slit the arm to get it off if yours is this same style--that's how fused together the parts were.

[mmcintee1985@gmail.com]

There were a lot of different styles over the years.  I had a boat from that vintage and I remember I had to remove/destroy the part that was covering the access to the arm/shaft.  After that I was able to get a small puller on it and get it removed.  That was a long time ago, and from what I remember, the shaft was knurled and the arm was really on there--it may have been a spline but my best recollection is a knurl.  It wouldn't shock me if you had to slit the arm to get it off if yours is this same style--that's how fused together the parts were.

That’s kind of what I was thinking and unsure of the availability of replacements if I grind it off. But based on what you’re saying if it’s a knurled post then most likely it is held on by a retaining clip. This is what a previous poster mentioned. So I will need to take a better look at the underside of the arm where it attaches to the post.

[hiccup]

To be 100% clear, there was no retaining clip on mine. It was a press-fit. I'm sure there were other styles as well.

[mmcintee1985@gmail.com]

To be 100% clear, there was no retaining clip on mine.  It was a press-fit.  I'm sure there were other styles as well.

So is the spline similar to a car with press fit and typically a catch or hole to pin the wiper up against tension on the spring?  This allows you to then create some leverage and wiggle them off. Or just press on and pry off…

[cp4000]

    So this is what mine was like...(See attachment)
it had splines, not knurled.  If you look close you can see a dimple which held in a washer which held in the C clip.  The C clip would move out of the way when attached and then snap into a groove when seated.  You can't see the C clip when installed.  Technically, prying it off, the C clip should release however, they are on so tight that I usually damage the washer and the C clip falls out.  
Does that all makes sense?

[mmcintee1985@gmail.com]

So this is what mine was like...(See attachment)
it had splines, not knurled.  If you look close you can see a dimple which held in a washer which held in the C clip.  The C clip would move out of the way when attached and then snap into a groove when seated.  You can't see the C clip when installed.  Technically, prying it off, the C clip should release however, they are on so tight that I usually damage the washer and the C clip falls out.  
Does that all makes sense?

Hi thanks for your help. I appreciate it. I will be there on Saturday and fingers crossed this is the style.

[mmcintee1985@gmail.com]

So this is what mine was like...(See attachment)
it had splines, not knurled.  If you look close you can see a dimple in which held in a washer which held in the C clip.  The C clip would move out of the way when attached and then snap into a groove when seated.  You can't see the C clip when installed.  Technically, prying it off, the C clip should release however, they are on so tight that I usually damage the washer and the C clip falls out.  
Does that all makes sense?

Update I was able to get them off. The picture with instructions about the drum elevator helped. That is the style I have. So it was just a matter of prying it off with the drum elevator still inside the arm.