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Quote:
Originally Posted by famoroso View Post
Is this as simple as disconnecting the transmissions, removing them entirely, or...?

I really wish my car had a manual top. One of the linked threads refers to "robust mechanism." I don't know, seems kinda Rube Goldberg to me. The original owner could have spent that $2,426 elsewhere on some other options!
I think that's a bit unfair. It's been working for 30 years, most cars are not even an entity any more after such a long time.
Has the top ever been serviced or re-adjusted? It's easy to overtighten the bolt that tightens the main bow, one fo the bolts I have is actually bent, and I believe that is M8.

That said spare parts for the tops are very expensive. I've been thinking of the conversion too because of some electrical problems I've had but decided I'd like to keep the car as close to stock as possible.
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1988 911 Cabrio
Old 12-14-2015, 12:04 PM
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Originally Posted by wachuko View Post
Here my thread (on another forum) when I fixed mine... I caught it in time before it damaged the parts that broke on your car...

Cabrio Top Mechanism Problems - Rennlist Discussion Forums
Thanks for sharing your thread. I will look into the motor hardware while figuring out what to do.
Old 12-14-2015, 12:13 PM
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Originally Posted by tdw28210 View Post
LA Dismantlers guys have been cool to me. Good luck.
Well...they don't have the part I need. But they did have an entire top to sell to me...$2500. Since the fabric is in great shape and doesn't need to be replaced, I can't justify purchasing an entire top for just two parts.

I might be looking at welding
Old 12-14-2015, 12:17 PM
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Originally Posted by wayne robson View Post
Hi DeltaBravo, just in case this helps you,for sale on ebay,but i am sorry i
am not good on computor i can not drag these from ebay, take alook
these are the item numbers.
-----181957308700----252188849772----370840285550---231119880710
something here may help,can get my wife to paste these and other parts in 8 hours as it is
1.00am here now.If you ever find something at --Specalized german in Rancho Cordova
By Sacramento i have a friend that could inspect them for you. regards Wayne, Australia.
Great finds...thank you.
Old 12-14-2015, 12:23 PM
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Originally Posted by ystarrev View Post
BTDT.

Its not that hard to R&R the piece and have it welded. Replacement piece was hard to find or very $$$.

Broken Top Bow on 88 Cabriolet
I'm thinking this might be the best option for me! remove, have it welded, install and move on...
Old 12-14-2015, 12:26 PM
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Quote:
Originally Posted by geoz View Post
I think that's a bit unfair. It's been working for 30 years, most cars are not even an entity any more after such a long time.
Has the top ever been serviced or re-adjusted? It's easy to overtighten the bolt that tightens the main bow, one fo the bolts I have is actually bent, and I believe that is M8.

That said spare parts for the tops are very expensive. I've been thinking of the conversion too because of some electrical problems I've had but decided I'd like to keep the car as close to stock as possible.
Ok, a bit unfair. I'll concede that point to you.

I'm just paranoid that something is going to go *snap,* *crackle,* *pop* or *boom.* So, if I can reduce the chance of that by bypassing the power mechanism with fully reversible modifications, well... then... all the better! Especially if it's as easy as loosening two bolts. Further, can the transmissions then be removed and stored separately?

I would also like to de-electrify / de-automate the top latches, but I assume that's more involved (i.e. Removing the motors and replacing them, with the manual latch counterparts), so I'll save that for a later date.

Given the "do the hokey-pokey" top operation procedure (part of the system's Rube Goldbergness in my estimation) wherein it can only be operated engine-off, key in 1st position, etc., I think that full manual operation would be faster / more flexible anyway.

When I was shopping for a car this past summer, one of the four M491 Cabs I looked at had a manual top. It was SWEET!!!

The PO of my '88 installed a 993 "type" Cabrio top a couple years ago. It's funny. The OE guy in me wouldn't have chosen to "upgrade," but now, in retrospect, I'm glad he did. No complaints, however the right front corner / pin does hang up a bit on the opening cycle. It's minor, so I think it needs a minor adjustment. I'm having Tom Amon, mobile 911 specialist extraordinaire, coming by in a few weeks and that's one of the things I'll have him look at. Everything seems to work just fine on the closing portion of the cycle.

Last edited by famoroso; 01-04-2016 at 08:49 AM..
Old 12-15-2015, 06:13 AM
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When the my main bow snapped it also broke the hold down on one of the transmissions for the power top. I simply removed the connection between the transmissions and the top and raise it manually. I was lucky that there was no other real damage and the power locks continue to work. I think the only other thing I did was remove the bull from the top indicator light as it had a tendency to go on at the wrong time. I think if I play around with the microswitches I could fix it but taking out the bulb was easier. So far it had been about 4 years this way with no ill effect that I can see.
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Old 12-15-2015, 06:19 AM
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Thankful that my '84 has a manual top. I am still very careful when moving it up or down.
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Old 12-15-2015, 10:15 AM
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I guess you can't edit your posts to add pics.

Here are some pics of my '88 M491 Cabrio with 993 "type" top. Yeah, it isn't the way the vehicle left the factory, but... it is pretty sleek. I like the lack of flaps compared to the original and the smoother arc roof-line it provides. Flows into the tail-less deck lid quite nicely...

I'll like it more once it's partially converted to manual operation and even more once it's converted to full manual operation.




Last edited by famoroso; 01-04-2016 at 08:50 AM..
Old 12-15-2015, 01:52 PM
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Cab top vent

That looks really bad. Sorry for your loss. I had a 993 with the power top and I had trouble with it getting out of synch all the time. I tore into it and I couldn't believe what a piece of junk the thing was. The transmissions run with speedometer cables that shorten with use. The cables pull out of the worm gear on one side which causes disasters because one side pushes while the other does not, causing problems like yours. I got the thing fixed so it would work with the button, but I never trusted it after examining the operating mechanism and used it manually after that. As stated in an earlier post, one just has to loosen the transmission center bolts (10mm as I recall) and they become pivot points for the frame. My current cab is an 86 with manual top and manual latches on the header. The lack of power top mech was one of the features that sold me on the car. The Porsche power tops from that era are crap and besides that, who needs a power top for something that small? My S2000 had a power top and it was just tiny, why? But since it was a Honda it worked flawlessly.
Old 12-17-2015, 07:45 PM
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OK, so I loosened the 19mm bolt on the transmissions. Seemed like a half-measure though, so I went ahead and removed the arms from the transmissions to the main bow. I left the short arm section on the passenger side that engages the transmission microswitches. The electric top motor still runs though with this setup? Is there a way to bypass this and still use the electric latch motors?

I will definitely go full manual operation soon.

Do any of you pull the transmissions and electric motor? Or, are you just leaving that system installed and disconnected?






Last edited by famoroso; 12-31-2015 at 07:46 AM..
Old 12-31-2015, 07:28 AM
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I'm subscribed, my 87 will need a new top in the near future. PO installed Wide body kit (964) and rear deck lid and top don't fit well. I thinking manual & 993 top will work?
Terry
Old 12-31-2015, 07:56 AM
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Quote:
Originally Posted by hangar21 View Post
I'm subscribed, my 87 will need a new top in the near future. PO installed Wide body kit (964) and rear deck lid and top don't fit well. I thinking manual & 993 top will work?
Terry
993-styled top.... an actual 993 top will not work...

I went the same route on my 964.... a 993-styled top. Looks better, imho, than the original style...

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Old 12-31-2015, 08:03 AM
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Quote:
Originally Posted by famoroso View Post
...Do any of you pull the transmissions and electric motor? Or, are you just leaving that system installed and disconnected?
Leave them in place... and find a secure/safe place (where you can find them again) for the parts you removed...
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Old 12-31-2015, 08:04 AM
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Originally Posted by wachuko View Post
Leave them in place... and find a secure/safe place (where you can find them again) for the parts you removed...
Gotcha, but did you disconnect the electric motor, or does it run every time you open / close the top even though the transmissions are disconnected?
Old 12-31-2015, 07:00 PM
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I got my electric top back to work after "major" surgery (put on a completely new top and a new loop because the old one was damaged). Honestly it was not too bad, I was surprised how quickly the roof comes off / goes on again.

I love it when the roof opens at the touch of a button.
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Old 12-31-2015, 10:44 PM
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Wachuko,
Thanks for clarifying the 993 "type" top. I agree, that looks great! Does the top operate electrically or did you go Manuel?
Terry
Old 01-02-2016, 09:22 AM
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Originally Posted by famoroso View Post
Gotcha, but did you disconnect the electric motor, or does it run every time you open / close the top even though the transmissions are disconnected?
I my case, I left it working after fixing the bolt areas... has been working fine so far. I did use it manually for a few weeks while I fixed the transmission...
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Old 01-02-2016, 09:30 AM
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Quote:
Originally Posted by hangar21 View Post
Wachuko,
Thanks for clarifying the 993 "type" top. I agree, that looks great! Does the top operate electrically or did you go Manuel?
Terry
I left it working with the motor and transmission... I did use it manually for a few weeks while I fixed the transmission...
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Old 01-02-2016, 09:31 AM
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Originally Posted by famoroso View Post
OK, so I loosened the 19mm bolt on the transmissions. Seemed like a half-measure though, so I went ahead and removed the arms from the transmissions to the main bow. I left the short arm section on the passenger side that engages the transmission microswitches. The electric top motor still runs though with this setup? Is there a way to bypass this and still use the electric latch motors?

I will definitely go full manual operation soon.

Greetings all,

I've been operating the top in semi-auto / semi-manual mode.

I still want to convert the top header latches to manual.

I have gotten tired of having to run the top motor for as long as it takes the transmission arm to engage the fully open and fully closed microswitches, and vice versa.

So, I added a small piece of angle aluminum such that the range of motion for the transmission arm to engage one microswitch or the other is VERY short. I only have to operate the switch for less than a second for the red cabrio top dash light to go out...






Old 02-07-2016, 08:21 PM
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