[Vwdiesel] Injector Seals

[mark shepherd]

testing
----- Original Message ----- 
From: "James Hansen" <jhsg at sasktel.net>
To: "'Dave Cook'" <davevw at yahoo.com>; "'Audi-VW-Diesels Group'" 
<Audi-VW-Diesels at yahoogroups.com>; "'VW Diesel Group'" <vwdiesel at vwfans.com>
Sent: Monday, April 11, 2011 6:13 AM
Subject: Re: [Vwdiesel] Injector Seals


>
> Yes, they need to be new, or at least reformed.  What i mean is, the new
> seal will have a touch more dish in it than a used one.  They have some
> preload in their shape, so when the injector pushes down on them, the
> springiness of the seal squishes under torque and maintains sealing 
> pressure
> against the nozzle through heat cycles, etc. as the injector moves 
> slightly
> through those heat cycles.  Used ones have less shape, hence less preload,
> and may leak, filling the injector threads with carbon, seizing it to the
> head, killing threads on the way out, etc..  You can reshape them with a 
> big
> centerpunch and a block of wood- just bop them a little bit to the nozzle
> side, and they will mimic new ones.  I've done this lots.  You can grind 
> one
> yourself with a drill and a grinder.  Chuck the punch stock, preferably 
> some
> cold rolled, and grind to a point, to match the injector seal body shape.
> It doesn't take much, and they can crack... so careful, or anneal them
> first. (bring to a red normalizing heat, then let cool very very slowly)
> -james
>
> -----Original Message-----
> From: vwdiesel-bounces at vwfans.com [mailto:vwdiesel-bounces at vwfans.com] On
> Behalf Of Dave Cook
> Sent: April-10-11 6:56 PM
> To: Audi-VW-Diesels Group; VW Diesel Group
> Subject: [Vwdiesel] Injector Seals
>
> Someone please tell me it is ok to reuse injector seals!
>
> I am very close to having the engine hooked up!  It is all bolted into the
> car, just working on hooking up fuel, coolant, clutch, etc etc lines and
> wires.  If possible, I might be able to crank it tonight!
>
> I noted when I was cranking over the engine that I could hear compression
> leaking around number 1 injector.  So I went to tighten it and it was only
> finger tight.  Well, all the other injectors are also loose so I popped 
> them
> out to take a quick look.  All were ok, but I kinda thought the seals 
> needed
> to be new every time they were installed.  Good thing I checked, though, 
> as
> number 4 didn't have a seal in there at all!
>
> I could pull a seal out of another head, assuming that is ok to do...
>
> I could get some tomorrow afternoon probably, but have to work late 
> tomorrow
> and Tuesday so it will be a few more days before I could try to start it,
> and I'm rather impatient!
>
> Dave Cook
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