colin3511 Posted September 3, 2019 Report Share Posted September 3, 2019 I have a set of bodies but don't recognize the air bleed screw. Someone has suggested it is off the later TR5, or very early TR6 specification. This would have been before the brass, later air bleed screw and after the version with no bleed at all. Any ideas? Colin Quote Link to post Share on other sites
saffrontr Posted September 3, 2019 Report Share Posted September 3, 2019 It's from an early TR6, the TR5 didn't have an air bleed fitted when built. Quote Link to post Share on other sites
dblenk Posted September 3, 2019 Report Share Posted September 3, 2019 thought they were fitted to a 5 as an after market ??? i have both manifolds so was fitting the bolt unit to my 5 when it comes round to it ?? david Quote Link to post Share on other sites
colin3511 Posted September 3, 2019 Author Report Share Posted September 3, 2019 Interesting. Just spoken to someone who has owned their TR5 from new - it has the air bleed. It was a very late TR5. Colin Quote Link to post Share on other sites
saffrontr Posted September 3, 2019 Report Share Posted September 3, 2019 Colin, they were fitted by the Dealers to very late TR5 and also to earlier TR5's where there were complaints about loss of idling due to lacquer build up in the butterflies. The Triumph drawing showing how they were to be fitted is dated 22nd October 1968 and further details provided in Newsletter 183 to the Dealers dated 1st November 1968 so after production had finished. I have copies of both and can scan and send to anyone interested, just send me a pm with email address. Quote Link to post Share on other sites
Tom Fremont Posted September 3, 2019 Report Share Posted September 3, 2019 11 minutes ago, saffrontr said: loss of idling due to lacquer build up in the butterflies. That's an interesting one. Maybe today's fuel doesn't do that; I've not had to clean the throttle plates in my Webers in 23 years / 130K miles. I do use cleaning additives however. Tom Quote Link to post Share on other sites
saffrontr Posted September 3, 2019 Report Share Posted September 3, 2019 Tom, they call it oil lacquer in the Newsletter as per attached. The drawings go into a bit more detail. Derek Newsletter 183.pdf Quote Link to post Share on other sites
Mike C Posted September 3, 2019 Report Share Posted September 3, 2019 " The headlight dipping switch works in the opposite direction to that shown in the owners handbook"- a simple note in the weekly dealers newsletter took care of this anomaly in 1968. I couldn't see that being the case today. Quote Link to post Share on other sites
Andy Moltu Posted September 5, 2019 Report Share Posted September 5, 2019 Is that a standard air bleed valve? Or is it a modification to allow a second bleed valve to be fitted to help No's 5 & 6 plugs from sooting up at idle. Quote Link to post Share on other sites
stuart Posted September 5, 2019 Report Share Posted September 5, 2019 1 hour ago, Andy Moltu said: Is that a standard air bleed valve? Or is it a modification to allow a second bleed valve to be fitted to help No's 5 & 6 plugs from sooting up at idle. Thats the very early factory version before the brass sprung version. Stuart. Quote Link to post Share on other sites
michaelfinnis Posted September 5, 2019 Report Share Posted September 5, 2019 Thats interesting,I have the same type of valve on my early 1969 TR6. I guessed it must have only been fitted to early production cars, since I've never seen another one before, and I've never found it in any parts catalogue. The standard air pipe does not fit it. mike. Quote Link to post Share on other sites
saffrontr Posted September 5, 2019 Report Share Posted September 5, 2019 Mike, the early air valve is part no 152689. Agreed that it isn't listed as a separate part in the parts catalogue where it comes as part of the inlet manifold. It is however noted in the service newsletters and drawings. Derek Quote Link to post Share on other sites
Tom Fremont Posted September 5, 2019 Report Share Posted September 5, 2019 On 9/3/2019 at 3:23 PM, saffrontr said: Tom, they call it oil lacquer in the Newsletter as per attached. The drawings go into a bit more detail. Derek Newsletter 183.pdf 1.13 MB · 34 downloads Oil from the crankcase ventilation hose to the air plenum? Tom Quote Link to post Share on other sites
saffrontr Posted September 5, 2019 Report Share Posted September 5, 2019 Tom, attached poor copy scan from Newsletter 180 of the 11th October 1968 notes that it is down to a gradual build up of congealed oil on the face of the butterflies which can only be down to oil from the crankcase ventilation as you note Derek Quote Link to post Share on other sites
Tom Fremont Posted September 5, 2019 Report Share Posted September 5, 2019 Thanks for that, Derek - amazing archive you have! As it happens, my Weber DCOE setup incorporates the SMITHS PCV valve downstream of the carbs just like the original TR250s did, so carbs/throttle plates are held harmless. Original sales brochure for the TR5 shows the same valve; guess they changed their mind. Tom Quote Link to post Share on other sites
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