Colin Armstrong Posted July 20, 2021 Share Posted July 20, 2021 I've got a 13\60 Herald with spitfire mark 4 1300 engine and gearbox non I\do which size prop shaft do I need. Any help much appreciated Quote Link to comment Share on other sites More sharing options...
RobPearce Posted July 21, 2021 Share Posted July 21, 2021 Pretty sure the MkIV Spitfire gearbox is the same casing as the original Herald one - some internal differences but nothing external. If it's non-OD then you just need the normal Herald propshaft. You will need to ensure the engine and gearbox mounts are correctly positioned because the Herald prop has no adjustment - all the tolerances are taken up in the positioning of the mounts. The only thing you may need to change on the propshaft is the front UJ flange, because I think the all-synchro gearbox may use the large bolt flanges. Quote Link to comment Share on other sites More sharing options...
Dogsbody47uk Posted July 21, 2021 Share Posted July 21, 2021 The Mark4 Spitfire box is all synchro, unlike the Herald box. I believe it is about 1 inch longer than the Herald set up so a shorter prop is needed, and you will definitely need a larger front flange on the propshaft. Canley classics can provide the prop ( at a price! ). Try Steve Morris at Triumph Spitfire Spares; he may still have the appropriate propshaft that I gave him months ago!. Cheers, Dave. Quote Link to comment Share on other sites More sharing options...
Dogsbody47uk Posted July 21, 2021 Share Posted July 21, 2021 I'm not sure about the gearbox length, but I am about needing a larger flange. If you get a new prop it will most likely have a sliding joint at the rear. This gives you more leeway in fitting it. Cheers, Dave. Quote Link to comment Share on other sites More sharing options...
RobPearce Posted July 21, 2021 Share Posted July 21, 2021 6 hours ago, Dogsbody47uk said: The Mark4 Spitfire box is all synchro, unlike the Herald box. True. 6 hours ago, Dogsbody47uk said: I believe it is about 1 inch longer than the Herald set up I believe that's not true, though. You may be thinking of the single-rail 1500 box, which is definitely longer. Quote Link to comment Share on other sites More sharing options...
Nick Jones Posted July 21, 2021 Share Posted July 21, 2021 It’s the single rail (1500) box that is longer. The 4 synchro 3 rail is the same length as the Herald box but has a round output flange which takes the bigger UJ flange. So you need a Herald Propshaft and swap the front UJ flange. Nick Quote Link to comment Share on other sites More sharing options...
thescrapman Posted July 22, 2021 Share Posted July 22, 2021 You can redrill a new set of holes in the rear flange, to match propshaft. I have a few boxes thus equipped, Quote Link to comment Share on other sites More sharing options...
Dogsbody47uk Posted July 27, 2021 Share Posted July 27, 2021 Sorry folks...my faulty memory. I have a 1500 box in my 13/60 and it is indeed an inch longer , but you are right, the mark 4 box is the same length as a Herald box. Quote Link to comment Share on other sites More sharing options...
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