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Johann
Joined: 07 Aug 2016 Posts: 240 Location: Netherlands
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Posted: Sat Aug 26, 2017 9:02 pm Post subject: How do you seal the injector holders in a 931? |
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I have removed all my K-jetronic components to have them rebuilt and balanced by a CIS Specialist. One thing i noticed as I removed the injectors is that the holders are quite loose.
It might very well be that the car is leaking around the holders. What do you guys use to "seal" the holders?
I have been on the interwebs for hours looking for a type of thread locker or sealant. The only thing I can find that is compatibe with plastic is LOCTITE THREADLOCK TAPE 249 or similar plumbling tape
Your help is appreciated. |
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924RACR
Joined: 29 Jul 2001 Posts: 8815 Location: Royal Oak, MI, USA
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MikeJinCO
Joined: 08 Jun 2010 Posts: 1228 Location: Maysville, Colorado
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Posted: Sun Aug 27, 2017 10:33 pm Post subject: |
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I can't say that this is the best solution, but for sealing threads with plastic pipe a teflon pipe dope in a tube(plumbing supply) is normally used rather than tape as it flows better and won't break the plastic as tape possibly can. Tape is best on metal to metal threads. _________________ Mike
'67 MG Midget Dp
'71 Ocelot Dsr Kawasaki 1000(under rebuild) |
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Johann
Joined: 07 Aug 2016 Posts: 240 Location: Netherlands
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Posted: Mon Aug 28, 2017 3:09 am Post subject: |
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Thank you gentlemen, I have ordered a tube of Loctite 570. It seems to be the closest to the Permatex and comes up when searching for pipe dope too |
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924RACR
Joined: 29 Jul 2001 Posts: 8815 Location: Royal Oak, MI, USA
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Posted: Mon Aug 28, 2017 9:47 pm Post subject: |
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Actually, turns out the teflon tape isn't so good for motor applications... it doesn't seal pipe thread, but reduces the friction to allow you to tighten the thread more to achieve the metal-to-metal seal... hence why I was pointed to the Permatex stuff instead...
Very important on my racecar, where vibrations will loosen EVERYTHING not locked down... _________________ Vaughan Scott
Webmeister
'79 924 #77 SCCA H Prod racecar
'82 931 Plat. Silver
#25 Hidari Firefly P2 sports prototype |
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924RACR
Joined: 29 Jul 2001 Posts: 8815 Location: Royal Oak, MI, USA
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Posted: Mon Aug 28, 2017 9:50 pm Post subject: |
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Looked a bit more... I wonder if Loctite 545 might be a closer match to the Permatex... _________________ Vaughan Scott
Webmeister
'79 924 #77 SCCA H Prod racecar
'82 931 Plat. Silver
#25 Hidari Firefly P2 sports prototype |
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Carrera RSR
Joined: 08 Jan 2010 Posts: 2309 Location: Somerset, UK
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Posted: Tue Aug 29, 2017 6:35 pm Post subject: |
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I used Loctite 577 _________________ 1980 931 - forged pistons, Piper cam, K27/26 3257 6.10 hybrid turbo, 951 FMIC, custom intake, Mittelmotor dizzy & cam pulley, H&S exhaust, GAZ Gold, Fuch'ed, Quaife
Now www.924board.org/viewtopic.php?t=34690
Then www.924board.org/viewtopic.php?t=31252 |
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knobby
Joined: 23 May 2011 Posts: 43 Location: Cincinnati,Ohio
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Posted: Sat Jul 07, 2018 12:42 am Post subject: Injector socket/holder seal |
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I have a loose one.The holder(socket) seems loose on mine.
I just bought a set of new injectors and am getting ready to install them and rectify the loose thread.I don’t know yet if the looseness is because of backing out of the head or what but I was wondering how your injector install went and what thread sealer compound you ended up using and also the seal between the injector and the socket/holder p/n 900 123 033 20 sealing ring,is this a generic part or did you need to obtain from Porsche? _________________ 81 RED 931 S2(daily driver),81 WHITE 931 S2(not currently drivable).
Cincinnati,Ohio |
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