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Discussion Starter · #1 ·
Hi folks,

I have found this site to have lots of interesting info and my thanks to those who share their experience.
Hoping you will be able to help me with my quest to have all the correct parts at hand when I go to change my gearbox oil. 3.4L, 6 speed manual.

This task has never been an issue with any other vehicle I have or do own, but this Boxster thing is playing hard to get.
According to the Porsche centres here in Scotland they are unable to determine if there are sealing washers fitted to the gearbox drain and fill plugs, so they cannot provide me with the parts nor provided part numbers! A situation I find very bizarre, and worrying since the car has a full OPC service history.

Anyone out there had this experience and come out the other side more informed than the OPC?
I am hoping for conformation that they exist, and if possible their part numbers.
I would normally reuse gearbox drain plugs and just fit new sealing washers, but perhaps these drain and fill plugs are self sealing and need to be replaced once opened.

Many thanks for any help,

Craig
 

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I don't recall a sealing or "crush" washer on the drain or fill plug on the transaxle. The torque spec as reported elsewhere is 30 ft lbs, but I would think 20ish would be plenty.
 

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I remember reading somewhere (maybe Pelican article) that leaking of transmission oil isn't a problem since it is so much thicker (higher viscosity) than engine oil.
 

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Haven't needed to do it on my Cayman yet, but all of my previous Porsches did not use a washer for the tranny fill and drain plugs. I believe they have a slightly conical design that provides a tight seal. I've never had a problem with leaks from those ports, and that includes 40 year old 914 transmissions.

+1 to Boiler Inspector, do not overtighten!
 

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Discussion Starter · #5 ·
Thanks for the replies!

If the plug is conical, similar to a brake bleed nipple design, then that would explain how it can seal without a washer and the lack of any seal details on the OPC's drawings, but not so much their lack of experience in this matter. May be time to go Independent specialist for my service book stamps from now on.

Thanks again!

C
 

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It never hurts to have a copper crush washer on a flat flange drain plug. But as previously advised, observe recommended torque values. If the parts diagram doesn't show one, it can do without.
 

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+1 The trans axle drain and fill plugs are pipe threads with a taper. I put a little sealant on the threads when re-installing the plugs. 6 speed trans axle use standard hex bits. You might consider cutting a hole in the plate under the drain plug to save time when changing fluid.
 

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Discussion Starter · #9 ·
Some online shops selling OEM show a plug only, some show a plug and make mention of the need for a sealing ring and some after-market parts show a plug and sealing ring. Confusing indeed!


To ensure I'm covered I have ordered both the gearbox and engine drain plugs from Dimple products (Magnetic drain plugs) in the USA. They show a plug with a heavy duty magnet and a sealing ring.
This combined with my thread tape and copper washer selection box should prevent me from being stranded.
I certainly didn't expect such a hard time preparing for this 'simple' maintenance. Can't wait to see what I come across when go to fit the plenum,T/B and software, but I'll be leaving that adventure till spring.


I will confirm what I find when I pull the plug in a couple of weeks time, but as mentioned above, Jeff_07S found no washer and the gearbox was not leaking, I presume :), so I guess I'll find just a plug.

Although if the Dimple plug fits properly I likely will have a washer from then on.


Thanks to all for your input.


C
 

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No washers on transmission drain and fill plugs (BTW, they're same part number). Have flushed trans oil multiple times. 30 ft/lb torque.

One tip: loosen the fill plug before you drain trans oil. Apparently it's not uncommon for people to drain trans oil then are unable to remove the fill plug.... ending in flat-bedding to a local shop or dealer!
 
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Discussion Starter · #12 · (Edited)
Thanks for the info on the part numbers being the same!
And the sound advice regarding the fill plug.
Although, If I do forget and run into trouble, some extreme jacking of the car might allow it to be filled again via the drain plug hole. :)

Seasons greeting all!
 

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Thanks for the info on the part numbers being the same!
And the sound advice regarding the fill plug.
Although, If I do forget and run into trouble, some extreme jacking of the car might allow it to be filled again via the drain plug hole. :)

Seasons greeting all!
Extreme jacking wouldn't do it. You'd need the car inverted (wheels-up). If you are desperate, I guess you could pump up through the drain hole if you could seal the pump hose in the drain opening. You'd need to measure how much you pumped. Normally (using the correct opening), with the car level, you pump until it the fluid starts to spill-out of the fill-hole.
 
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