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Fuel Cap lock - removal ?
Hi,
how do I remove (and reinstall) the lock on the fuel cap on a '86 944 ? I had a look at the parts diagrams and know that they are separate pieces. Mine does not close tightly now - time for a new cap - I tried changing the rubber seal but it doesn't help - the cap's "anti-overtightening" mechanism is now too "lazy" and does not allow me to tighten the cap beyond slightly tight. shlim 86 944 |
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08-12-2002, 06:17 PM
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Location: Viera FL
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Your best bet would probably be a locksmith.
AFJuvat
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Es geht nicht darum wie schnell man faehrt, sondern wie gut man schnell fahren kann. Ihr Brunnen der nutzlosen Porsche Information |
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08-12-2002, 06:23 PM
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Recently took two apart to make a good one.
The red plastic cap just snaps off and you can get to the tumblers not needing a key. What breaks on the gas cap is a plastic pawl. It has a spring that forces this door latch looking pawl into the notches at the end of the metal "cup" that threads into the neck of the gas filler pipe. When you turn the key there is an offset pin that engages the other end of the pawl and pulls it away from the metal cup notches. Mine was broken just behind the pawl. The spring had forced the plastic sideways and jammed it into the notches. Was always "unlocked". Most likely this is an American design as it can be removed from the car without a key. If the Germans had designed it you would have had to jack up the left front and locked the windshield wipers in park to remove it.
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Hugh - So Cal 83 944 Driver Person NOT a 'real' Porsche -- Its Better!!!! When was the last time you changed your timing and balance belts and/or cam chain and tensioner? New Users please add your car's year and model to your signature line! Never break more than you fix! |
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08-12-2002, 07:05 PM
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Hugh,
thanks for the info - so I just pry the red plastic part off the cap and I'll be able to get at the key cylinder ? Actually your description raises my curiosity on whether my fuel cap is repairable. Mine locks and unlocks as per normal but it feels like the spring involved in preventing the overtightening is loose, hence, the cap does not screw in tightly to the filler neck. Guess I should open it first before buying a new cap. shlim 86 944 |
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08-13-2002, 11:39 PM
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Now that you understand the way the locking gas cap functions here's an answer to your refined question.
The gas cap is supposed to "ratchet" as it is tightened. This is to prevent over tightening. The key just pulls the pawl away from the notches so that the gas cap can not be unscrewed. This is the "locked" condition. The pawl on my old gas cap broke keeping it in the "unlocked" condition. It was interesting that is was still able to ratchet. So your gas cap is working normally albeit a bit loose on the ratchet feel. Back to the tumblers; by prying off the red plastic part you can get to and change the tumbers. If you buy a new one just put in your existing tumblers. Keep us posted on what you find. My extended explination is to share my findings with the members of this board.
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Hugh - So Cal 83 944 Driver Person NOT a 'real' Porsche -- Its Better!!!! When was the last time you changed your timing and balance belts and/or cam chain and tensioner? New Users please add your car's year and model to your signature line! Never break more than you fix! Last edited by SoCal Driver; 08-14-2002 at 07:33 AM.. |
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08-14-2002, 07:27 AM
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Hugh,
I finally got around to work on the fuel cap. Got the fuel cap off, figured that the plastic piece was worn and since the fuel cap was rather old, got a new cap. After getting the new cap, I tested the tightness of the new cap (without the key tumbler) - it was good. However, as soon as I installed the key tumbler, the cap was still as loose as the old one - ie the cap slips before the cap is tight enough. What gives ?? It looks like I'm back to square one ? I figured that the plastic piece is slightly further in once the tumbler is installed - which seems normal due to the design. Hence, I thought I'll ask this question on this board - is the fuel cap supposed to be only lightly tighten or does it tighten significantly ? It does seem to not smell as much now, with the new cap. shlim '85.5 944 |
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09-16-2002, 10:44 PM
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So you are not getting the ratcheting?
Interesting that these caps really don't have to be tight as the tank has a slight vacuum on it from the engine. This "tightens" the cap.
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Hugh - So Cal 83 944 Driver Person NOT a 'real' Porsche -- Its Better!!!! When was the last time you changed your timing and balance belts and/or cam chain and tensioner? New Users please add your car's year and model to your signature line! Never break more than you fix! |
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09-16-2002, 11:03 PM
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They don't go on as tight as one would think - almost like you "snug" it up.
AFJuvat
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Es geht nicht darum wie schnell man faehrt, sondern wie gut man schnell fahren kann. Ihr Brunnen der nutzlosen Porsche Information |
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09-17-2002, 02:24 AM
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Hugh, on the contrary - I'm getting too much racheting ! It rachetings/slips too quickly.
But I guess all of you are right - it does not need to be tighten too much to be tight enough. I've been putting my nose to the fuel cap and so far it seems to be air-tight. Looks like I have a leak somewhere else since I get some fuel smell in the car in the morning. shlim 85.5 944 |
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09-19-2002, 03:04 AM
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There is a steel U shaped cover that is supposed to seal the pipe from the side of the car into the fuel tank behind the rear passenger side "seat".
They use the same black squishy sealing tape/putty on this as the rear tail lights. This has a tendency to shrink a bit over years. Also the pipe slip and clamp connections and the recirculating/venting hoses that attach to it can develop leaks. Just takes the slightest to fill the cabin area with gas smell. Pulling this cover is some what of a pain as you may have to remove the rear side trim that fits under the quarter window trim.
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Hugh - So Cal 83 944 Driver Person NOT a 'real' Porsche -- Its Better!!!! When was the last time you changed your timing and balance belts and/or cam chain and tensioner? New Users please add your car's year and model to your signature line! Never break more than you fix! |
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09-19-2002, 09:50 AM
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1983 Porsche 944 2.5 liter
