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Injector lines repair

 
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jeneese  



Joined: 16 Oct 2015
Posts: 3
Location: Cottage Grove, WI

PostPosted: Thu Oct 11, 2018 7:00 am    Post subject: Injector lines repair Reply with quote

Cant find any earlier posts on this subject. I have a 1982 Euro spec big valve 924 brought here from Germany by Air force officer. I have owned this car for of 20 years. Needs all injector lines and pressure control lines replaced as the flexible part of the steel lines have the black rubber part of the flex lines failing. Is there a repair for this or do I need to replace the entire line assemblies assuming I can locate them?
Thanks.. BTW removing engine for new clutch.
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Jim

Porsche 1982 Euro Spec 924
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Carrera RSR  



Joined: 08 Jan 2010
Posts: 1581
Location: Somerset, UK

PostPosted: Thu Oct 11, 2018 6:49 pm    Post subject: Reply with quote

The outer rubber is sacrificial and often cracks. The inner hard line is unlikely to be damaged but check to make sure. I removed all the nasty rubber from mine and reused.
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1980 931 - forged pistons, Piper cam, CGT turbo, 951 ducted FMIC, custom intake, Mittelmotor dizzy & cam pulley, H&S exhaust, GAZ Gold, Fuch'ed, Quaife LSD
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Porver9two4  



Joined: 23 Jan 2004
Posts: 102
Location: United Kingdom

PostPosted: Thu Oct 11, 2018 8:24 pm    Post subject: Reply with quote

^ as above. The injector lines themselves are actually hard nylon and are incredibly hard wearing and long lived. The rubber covering is just that - a protective rubber covering. Deterioration is common and not of concern.
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bear924  



Joined: 26 Jul 2005
Posts: 73
Location: South West Queensland, Australia

PostPosted: Tue Oct 16, 2018 10:28 pm    Post subject: Reply with quote

I refreshed theae last year when i completed my engine rebuild. I believe I added a write up on this forum in how i did it. I woild post link etc however i only have access to my phone atm. Suggest your search my posts and see what you find.
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bureau13  



Joined: 07 Sep 2017
Posts: 77
Location: South Florida

PostPosted: Wed Oct 17, 2018 12:47 am    Post subject: Reply with quote

Is there a recommendation for replacing that rubber sheath? It may not cause actual problems but it doesn't look very good.

Preferably something that doesn't require disconnecting the lines...like a split-loom heat shrink? Does that exist? I have some split-look mesh stuff that I used on exposed wire bundles in a different car, but it would look wrong in this application.
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-----------------------------------------
1982 931
1986.5 Silver 928S
2007 Hummer H3 (Daily Driver)

Past lives (I miss them all):
2004 RX-8 (Wrecked)
1993 RX-7 (Sold)
1987 RX-7 Turbo II (Sold)
1985 RX-7 GSL (Stolen)
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kingzetts  



Joined: 13 May 2011
Posts: 10
Location: Worcestershire UK

PostPosted: Wed Oct 17, 2018 7:10 pm    Post subject: Reply with quote

I have used high-ratio glue-lined heat shrink, after carefully removing the perished rubber outer. It needs to be about 6:1 shrink ratio to get it over the fittings and bends in the steel line sections. Lines would have to be disconnected to fit, obviously.

It works well but the downside is the OD of the lines is increased somewhat (from about 6mm to around 9mm) which has the side effect that you will not get all 4 injector lines through the side-by-side clamp bracket near the front of the head.

I was unable to find any higher-ratio shrink material. A ratio of about 8:1 in non-glue-lined would be ideal if such a thing exists.
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John,
1980 924 turbo "timewarp" being restored
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