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Old 12-16-2012, 06:12 PM   #1
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oil pan bolts.

when trying to fix an oil leak from the oil pan, i discovered broken bolt.
i was thinking to reseal the pan and replace all 13 bolts.
i ordered the bolts among some other parts, but sunset had only 2 bots in hand, so i took them.
today i was planing to remove the broken bolt, and complete the task.
i cleaned all the bolts i have (that i previously removed from the pan), and then reached for the 2 new ones i got.
when i looked at it, the two new bolts are shorter then the ones i have.
the new bolt is M6X16. the old is M6X20.
see attached pics.






at first i was sure i ordered the wrong bolt, buy checking at the parts list, it looks like the correct size is the 16mm.
so where the hell those 20's came from?
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Old 12-16-2012, 07:08 PM   #2
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I would use 20mm bolts if that is what was in there before. Just get any good quality bolt, doesn't have to be from porsche. You are putting a steel bolt into aluminum threads, so you want as long a bolt as possible to help avoid stripping the aluminum threads.
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Old 12-16-2012, 08:34 PM   #3
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Quote:
Originally Posted by san rensho View Post
I would use 20mm bolts if that is what was in there before. Just get any good quality bolt, doesn't have to be from porsche. You are putting a steel bolt into aluminum threads, so you want as long a bolt as possible to help avoid stripping the aluminum threads.
You have a point, but on the other hand, any source I checked shows 16.
I'm really puzzled by that.
Thanks for the advise.
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Old 12-17-2012, 11:02 AM   #4
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external Torx head

I could swear that the oil pan bolts had an external Torx head...
perhaps too much tequila?

.
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Old 12-17-2012, 11:17 AM   #5
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Quote:
Originally Posted by Gilles View Post
I could swear that the oil pan bolts had an external Torx head...
perhaps too much tequila?

.
i guess.
the ones i have are regular hex head but 20mm long.
all part lists i checked show the same bolt, only shorter.
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Old 12-17-2012, 03:50 PM   #6
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Quote:
Originally Posted by Gilles View Post
I could swear that the oil pan bolts had an external Torx head...
perhaps too much tequila?

.
That's the new design, smaller head = lighter?
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Old 12-17-2012, 04:53 PM   #7
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Originally Posted by BYprodriver View Post
That's the new design, smaller head = lighter?
LOL!
Maybe I should go with plastic. Get extra 2 MPH at top speed

Last edited by Meir; 12-17-2012 at 04:56 PM.
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Old 12-17-2012, 07:07 PM   #8
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Old 12-18-2012, 07:36 AM   #9
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I'm surprised that the steel bolts go into aluminum. I recall from my Navy days that our ship had a steel hull but some of the superstructure (bridge area) was aluminum so the ship wasn't top heavy. And we had to be cautious about how we connected the two because of accelerated corrosion caused by an interaction between the two different metals. I don't recall the details of how we did that as it is approaching 50 years ago but we either used special fasteners or kept the two metals apart by some insulating method.
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Old 12-18-2012, 08:44 AM   #10
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Originally Posted by mikefocke View Post
I'm surprised that the steel bolts go into aluminum. I recall from my Navy days that our ship had a steel hull but some of the superstructure (bridge area) was aluminum so the ship wasn't top heavy. And we had to be cautious about how we connected the two because of accelerated corrosion caused by an interaction between the two different metals. I don't recall the details of how we did that as it is approaching 50 years ago but we either used special fasteners or kept the two metals apart by some insulating method.
That's 1 of the reasons all the Porsche engine bolts are plated, with cadmium I think.
I guess the exhaust system bolts are 1 of the few exceptions.
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Old 12-18-2012, 09:40 AM   #11
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i just got the bolt from the local ACE.
i hope it is cadmium plated .
maybe in the future (when i have more input on this subject), i will replace all bolts with the OEM shorter ones.
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