Jacq Posted August 3, 2013 Report Share Posted August 3, 2013 Could anyone recommend something to seal threads on diesel fittings? PTFE tape seems to be broken down by diesel. Cheers. Link to comment Share on other sites More sharing options...
carlt Posted August 3, 2013 Report Share Posted August 3, 2013 PTFE is chemically inert so is suitable for use in diesel lines but go for the stuff in a yellow reel as it is twice the density (I think it is available in a pink reel too that is even denser but I haven't seen any). I got mine from Wickes. Link to comment Share on other sites More sharing options...
alan_fincher Posted August 3, 2013 Report Share Posted August 3, 2013 There are sometimes warnings about use of PTFE tape in diesel lines. Some claim that making the joint can cause small particles to be put into the line, which may then cause issues. Some sources say don't use unless in parts before the filter. No idea if this is valid though! Link to comment Share on other sites More sharing options...
onionbargee Posted August 3, 2013 Report Share Posted August 3, 2013 Loctite 2620 or 2422. Link to comment Share on other sites More sharing options...
Pilly Posted August 3, 2013 Report Share Posted August 3, 2013 We use ‘Rocol Oil Seal’ in the OIl Heating Industry Expensive ...but good. Link to comment Share on other sites More sharing options...
Speedwheel Posted August 3, 2013 Report Share Posted August 3, 2013 (edited) Heldite. Made in the UK too. Edited August 3, 2013 by Speedwheel Link to comment Share on other sites More sharing options...
BEngo Posted August 3, 2013 Report Share Posted August 3, 2013 Heldite is damn good stuff, but it sets like rock. I used some on my gas test point and it was a bugger to get undone. N Link to comment Share on other sites More sharing options...
Burgiesburnin Posted August 3, 2013 Report Share Posted August 3, 2013 I would use hemp. It's readily available here in SA. Not sure if it is in UK. Link to comment Share on other sites More sharing options...
Batavia Posted August 3, 2013 Report Share Posted August 3, 2013 Loctite 577 Chris G Link to comment Share on other sites More sharing options...
Timleech Posted August 3, 2013 Report Share Posted August 3, 2013 I would use hemp. It's readily available here in SA. Not sure if it is in UK. Yes it is, but it needs a sealant with it (IMO), Stag is a traditional one to use with it, Heldite will also work (but be harder to undo). Tim Link to comment Share on other sites More sharing options...
RLWP Posted August 3, 2013 Report Share Posted August 3, 2013 Could anyone recommend something to seal threads on diesel fittings? PTFE tape seems to be broken down by diesel. Cheers. Which fittings Jacq? Richard Link to comment Share on other sites More sharing options...
Puddlejumper Posted August 3, 2013 Report Share Posted August 3, 2013 Yes deffo Loctite 577 Link to comment Share on other sites More sharing options...
Jacq Posted August 3, 2013 Author Report Share Posted August 3, 2013 Which fittings Jacq? Richard On the fuel injection side. The fittings have a taper and are brass or bronze. Link to comment Share on other sites More sharing options...
RLWP Posted August 3, 2013 Report Share Posted August 3, 2013 (edited) If you mean the pipes from the pump to the injectors, there shouldn't be any sealing stuff at all. The metal to metal seals are good for around 8000 psi Brass or bronze doesn't sound like the high pressure pipes, but the low pressure ones. Even so, they should still work without PTFE tape Richard Edited August 3, 2013 by RLWP Link to comment Share on other sites More sharing options...
dmr Posted August 5, 2013 Report Share Posted August 5, 2013 Most fittings should have some kind of positive metal to metal seal such as an olive, or a machined face and copper washer. The threads are then used to apply the force rather than make the seal, (though lots of people still choose to use PTFE tape!).. Main exception is BSP tapered fittings. Are you sure you need to seal the thread?. ...............Dave Link to comment Share on other sites More sharing options...
carlt Posted August 5, 2013 Report Share Posted August 5, 2013 Main exception is BSP tapered fittings.... I wouldn't recommend Blue String Pudding to seal anything (with the exception of stern glands). Link to comment Share on other sites More sharing options...
Timleech Posted August 5, 2013 Report Share Posted August 5, 2013 On the fuel injection side. The fittings have a taper and are brass or bronze. Most fittings should have some kind of positive metal to metal seal such as an olive, or a machined face and copper washer. The threads are then used to apply the force rather than make the seal, (though lots of people still choose to use PTFE tape!).. Main exception is BSP tapered fittings. Are you sure you need to seal the thread?. ...............Dave Tim Link to comment Share on other sites More sharing options...
dmr Posted August 5, 2013 Report Share Posted August 5, 2013 Tim, Sorry I had in my head a picture of a plain taper under compression from a nut of some sort, rather than a tapered thread! Link to comment Share on other sites More sharing options...
RLWP Posted August 5, 2013 Report Share Posted August 5, 2013 Tim, Sorry I had in my head a picture of a plain taper under compression from a nut of some sort, rather than a tapered thread! Likewise here I hate those tapered BSP threads! Richard Link to comment Share on other sites More sharing options...
onionbargee Posted August 5, 2013 Report Share Posted August 5, 2013 Likewise here I hate those tapered BSP threads! Richar Threadist ! Link to comment Share on other sites More sharing options...
RLWP Posted August 5, 2013 Report Share Posted August 5, 2013 Threadist ! That's me! What's a leaky tapered thread doing in a fuel system? Now, a nice, parallel thread with a Dowty washer - that's a proper solution Richard Link to comment Share on other sites More sharing options...
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