1970 Triumph TR6 PI Restoration Project, Petrol Injection Manifold Cleaning 

Great work. I too have a 1970 TR6 PI. This was sold new here in early 1971. There were quite a few that came here (New Zealand) '69-'75. They were all PI's. Same spec as the UK.

Back in the day my father had a few 2.5pi big saloons. Lead from the leaded fuel used in the UK in that time was the cause of some issues with the Pi system. The remedy was to drive the car hard, revving it to the red line! I remember my father being so happy when the engine ran like it was supposed to again.

Hi Dave. I'm in the UK and I recondition all parts of the lucas injection system.

In the early 70s when I had my 68 TR5 we called the choke the over fuel .Turn on ignition pull the over fuel knob count to 10 turn the ignition switch hey presto !! Went every time , well nearly 😂

Cheers for the mention, and all the best of luck with the new project can. As always you know where I am for any advise 👍

Thanks

There is a guy in the UK who has designed a much improved PI throttle linkage. It uses bearings instead of crappy nylon bushes and has much more adjustability. Installed it on mine and I'm happy with it.

Cool . Interesting . look better now you cleaned them .

Good job Tush they look the business.

Another new and varied project Chef. Looking forward to it.

The cross shape in the nylon bushes for the injectors was introduced in an attempt to reduce heat soak from the throttle bodies to the injectors to try and minimise fuel vaporising in the injectors which subsequently created starting problems, due to air in the injector and hose. The cut away just reduces the contact area

I agree with Steve re: the throttle butterflies

Nice! I've never dealt with PI so I will watch closely.

As said I'd be tempted if there is no play in the spindles to have left the crud in place as it provided a good seal. If there is play in the shafts might be worth having the bodies machined to take some sealed bearings which will get rid of the play and improve the balance/response set up across all three units. To replace the crud spray the inlets with MolyKote which will improve the initial seal until the carbon/varnish builds back up. I'd recommend having a go with the DIY plating it's fun and satisfying seeing everything return to like new. Keep it coming!

Nice clean up, they look great.

Great work on the cleaning Dave and after I had cleaned the butterfly’s on my TR5 it was suggested that it would have been better to leave than dirty because of the seal issue and I have to confess she runs better tha more I use it…… so good advice from Steve and just in time. Kind regards, Richard.

Boy they cleaned up nice. I had an old kids cordless rotary toothbrush. It worked great in small places until it finally died. They aren't too expensive so I may buy a new one.

Wow this is going to be an interesting project Tush, they cleaned up well. my concern would be if they stay that clean for two years of storage if not clear coated. Looking forward to your next project TR3. Thanks agin for sharing your experiences, I’ve learned a lot over the past few years, that’s helped me with 1962 TR4. Got it running but having a tough time getting it to run smoothly with the webers and prextronix. But about a month ago I drove that car down the street and back. Thrilling to have that move under its own power for the first time in 40 plus years. Cheers !

Do you have continuing vids on the restoration of the 59 TR3A where you were installing the trunk floor and the ripples inserted. You seemed to just drop off the map on the project.

Love the new graphics! Looks like I need to invest in an ultrasonic cleaner! Eastwood’s retail store here I come!

For cleaning I used old tooth brush, ideal for small spaces.

Blades come out first, then the shaft. Open the throttle all the way and the blades should easily pull out of the slots in the shaft. Just like SU's

Could that PI set up bolt on to a carbureted TR6 engine? Same camshaft?

The nylon bushes that support the injectors are basically a push fit into the throttle bodies, each one has an O ring on. So if you wish you can remove and refit these when you refinish the bodies. I expect you will find the housing in the throttle bodies to be identical (and not related to the difference in injectors you are seeing). All of mine were push fit injectors and all have the cross shape when viewed end on.

Hello Dave. I haven’t chatted with you for ages. Off the topic I was wondering since G4 ??? Trans fluid is hard to find. Or at least for me. My TR6 is a 4 speed. Do you use straight 30 motor oil or 5w30 motor oil in your overdrive trains ?

Very interesting. Are you going to be able to get parts for this?

Do yourself a favor and get the injectors professionally rebuilt by a specialist in the UK. I wasted a lot of time and energy trying to do it myself. The rebuilt's made a world of difference.

the link is where Eugene