Injecting, the remedy

Well, it worked, sort of, well not really but.....



OK let's go through it - O rings in the inlet manifolds. 

This didn't go well, the O rings, despite being heat and fuel resistant Viton material, deformed. The machining came close to the edge of the manifold and we lost a bit, it sort of blew out. It was a bit think before but now, it's gone.


We were aware of how close the groove had been machined initially and were almost expecting this. The O ring failure however was unexpected. I've researched other materials and I did find some that would work but at over £100 per O ring I just didn't feel we should go on. 

All in all, a bit of an expensive fail but I hope we've come out the other side with a decent result.

So, plan B - return the manifolds to flush fitting with some suitable epoxy metal and use a conventional gasket, maybe with some high temp RTV to ensure a full and durable seal.


The reason that we took the inlets off was not to examine these O rings, they were doing OK. No, it was to drop the exhaust manifold in order to weld in a boss for a lambda probe. The idea being that we'll add an AFR gauge. If we also add in a vacuum gauge then together with the existing fuel pressure gauge we have enough data to effectively tune the PI on the road. This car is being built to go up mountains - more on that in later blogs :-)



Because the exhaust is mild steel and been on there for 25+ years, it's pretty well stuck on there. I decided that it was not worth the risk of damage to pull it completely off. James said he could weld the boss by dropping the exhaust but not fully removing it. So that's what's been done - it was still too tight to get a welding mask on whilst doing the welding! He did a decent job despite some difficult conditions.

I now need to try and find a suitable AFR gauge, a vacuum gauge and a place to put them. The current pair of SPA digital gauges are really nice but there's no real space there to slip another one in without some major surgery. 


Might have to go into the dash 😮


So, does it all run OK now? Dunno yet! 


 

Comments

Post a Comment

Popular posts from this blog

More Lucas PI info - some pearls of wisdom here :-)

Over the years I've collected loads of info and books about the PI system, some better than others. I have always meant to scan and post up some of the more interesting stuff. I had my scanner working recently (but not on my spanking new Vista equipped PC - incompatible!) so I thought I'd scan a few things when I came across an old trio of A4 sheets held together with a rusty staple. They appear to be pages from a magazine article but from where I don't know. The last page has a few small adds on it but no clue as to where it first appeared. The opening paragraph suggests and owners club and the adverts are 1990 vintage - if you know where this came from please let me know and I'll give them the credit. Anyway, I scanned it and OCR'd it and here it is. I've been through it to correct the OCR errors but if anything doesn't make sense shout up and I'll check the original. THE LUCAS PETROL INJECTION SYSTEM - MARK II We are very fortunate to be able to publi...
Read more

Worried about your trunnions? Relief is to hand!

Image
This is an bit of an infomercial for my mate Dave and his company Canley Classics. I know Dave well, I get most of my Triumph stuff from him. I sometimes work on the Canley Classics stand at shows, I own a Canley Classics T shirt and I have spent many hours driving Triumphs with him. Other Triumph parts suppliers are available, your mileage may vary and this may contain nuts. If you don't like what I say, ignore it :-) - It's a well know fact that the small chassis Triumphs have some design frailties. One of the more spectacular failures you can suffer stems from the front trunnions. When you get a failure here you can loose a front wheel - this isn't a good thing. Often incorrectly known as "trunnion failure" what actually happens is that the vertical link that sits in the trunnion snaps - it does this for a number of reasons, lack of maintenance, fatigue, corrosion, previous trauma, bad luck. Most often it's the nearside that goes, it's the side that ...
Read more

TR6 Clutch investigation (and interior replacement)

Image
Blimey, it's been a long time since I did anything serious in the garage. Having found myself with some time on my hands - I'm currently looking for paid work again - I decided it was high time I sorted out the TR6 interior. When I got the car it was the interior that let it down, a bit of a mix of old and repro trim, mostly past it's best, carpets stick directly to the floor and sagging seats. I did the seats immediately and then gathered the parts to do the rest - new carpets, underlay, a trim kit, H frame cover, clips and fastenings, glue, etc, etc. So it seemed like a "cheap" job as I had all of the big cost items. It was just time - and now I have that. So I stripped it all out and there it sat earlier this week, looking all empty and then I thought what a pig of a job it would be to have to take it all out again to fix the clutch! You see I've always had a tricky clutch in the car, not awful but occasionally when warm it gets quite "off/on...
Read more