Kenrow Posted February 12, 2021 Report Share Posted February 12, 2021 When I purchased my TR 30+ years ago I had the metering unit and injectors rebuilt. Unfortunately life got in the way of my restoration and the parts have been sitting in a box. Seems like there would be a need to redo everything as the seals etc put in back then are not current fuel compatible. Does that seem to be reasonable? I also rebuilt all the the hydraulics back then, even though I used a lot of rubber grease, should I anticipate rebuilding those? Ken in California Quote Link to post Share on other sites
PodOne Posted February 12, 2021 Report Share Posted February 12, 2021 Hi Ken After been sat for 30 years and been safety critical I'd be tempted to change them. Andy Quote Link to post Share on other sites
Mike C Posted February 12, 2021 Report Share Posted February 12, 2021 In Australia the PI system would have to use viton elastomers to work with our current fuels. 30 years ago nitrile was the common elastomer. A few years ago I replaced a leaking fuelling diaphragm with a nitrile component supplied by one of the major UK suppliers and it lasted less than an hour- monumental waste of time in removing, repairing and reinstalling/retiming the MU. And I pay a premium around here to avoid fuel that contains ethanol. Quote Link to post Share on other sites
astontr6 Posted February 12, 2021 Report Share Posted February 12, 2021 20 minutes ago, Mike C said: In Australia the PI system would have to use viton elastomers to work with our current fuels. 30 years ago nitrile was the common elastomer. A few years ago I replaced a leaking fuelling diaphragm with a nitrile component supplied by one of the major UK suppliers and it lasted less than an hour- monumental waste of time in removing, repairing and reinstalling/retiming the MU. And I pay a premium around here to avoid fuel that contains ethanol. Hi Mike, All the original seals in the Lucas PI system were Viton A based but some of the seals had a 10% swelling agent in them, i.e. the injector O ring seals to guarantee a good seal, by swelling up in the present of petrol and to stop drain down when engine was switched off. They were made by Dowty seals or Redditch mouldings. Bruce. Quote Link to post Share on other sites
Mike C Posted February 13, 2021 Report Share Posted February 13, 2021 14 hours ago, astontr6 said: That would be a legacy of the PI system initially being made by Lucas Aerospace- a bit above auto industry standards at the time. Quote Link to post Share on other sites
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