WHCapriceHBD
Member
Apparently the steel 'feet' that mount the rails down onto the intake manifold can tweak the rails forwards/backwards just enough to pinch an O-ring or unseat them. Seems to be a manufacturing tolerance thing with the rail. Mine seems to do it if you watch carefully when it pulls down.
I replaced all the O-rings about 6 or 8 months back, and replaced all the injector basket filters and the pintle caps and had the injectors all sonic cleaned and flow tested at the time (I did a large write-up on it a few pages back) and I've had the injector rail on and off a few times since then with no drama.
Looking at the whole thing, as you bolt the rail down, it pulls the injectors very slightly off kilt. It probably seals fine 9 times out of 10, but the last 2 times, it has caused weeping from the O-rings that I couldn't stop no matter how much I tried.
I've got a set of slightly oversized O-rings today, to fit more snugly in the rail and manifold. And instead of just rubber, these new ones are made of Viton, which is more durable. I'll install them tonight and I've given the rail feet a very slight adjustment in the vice and tested bolting it down until it stopped pulling the injectors over. I'm happy with the rail feet adjustment, so hopefully the new Viton O-rings do their part and everything seals nicer than before.
Nothing more irritating/offputting than weeping injectors and a fuelly smell in the dash vents.
Other news is that the silicone couplers I wanted for the MAF pipe have arrived, so I can get on with putting that on now. Its been on the bench staring at me for over a week..
I replaced all the O-rings about 6 or 8 months back, and replaced all the injector basket filters and the pintle caps and had the injectors all sonic cleaned and flow tested at the time (I did a large write-up on it a few pages back) and I've had the injector rail on and off a few times since then with no drama.
Looking at the whole thing, as you bolt the rail down, it pulls the injectors very slightly off kilt. It probably seals fine 9 times out of 10, but the last 2 times, it has caused weeping from the O-rings that I couldn't stop no matter how much I tried.
I've got a set of slightly oversized O-rings today, to fit more snugly in the rail and manifold. And instead of just rubber, these new ones are made of Viton, which is more durable. I'll install them tonight and I've given the rail feet a very slight adjustment in the vice and tested bolting it down until it stopped pulling the injectors over. I'm happy with the rail feet adjustment, so hopefully the new Viton O-rings do their part and everything seals nicer than before.
Nothing more irritating/offputting than weeping injectors and a fuelly smell in the dash vents.
Other news is that the silicone couplers I wanted for the MAF pipe have arrived, so I can get on with putting that on now. Its been on the bench staring at me for over a week..