John McCormack Posted July 7, 2019 Report Share Posted July 7, 2019 It has been a long time since I assembled a head. This is my low port head for the long door TR2. The valves, collars etc are all Moss items. I expected the collar to sit in the centre of the springs. The springs are centred in the indent in the head. Is this normal? Quote Link to post Share on other sites
Lebro Posted July 7, 2019 Report Share Posted July 7, 2019 Looks very wrong to me, but it's a while since I took any valves out - should there not be a reduced diameter under the cap which fits inside the spring ? Bob. Quote Link to post Share on other sites
Ian Vincent Posted July 7, 2019 Report Share Posted July 7, 2019 I haven’t got a low port head but mine doesn’t look like that. Rgds Ian Quote Link to post Share on other sites
John McCormack Posted July 7, 2019 Author Report Share Posted July 7, 2019 31 minutes ago, Lebro said: Looks very wrong to me, but it's a while since I took any valves out - should there not be a reduced diameter under the cap which fits inside the spring ? Bob. There is for the inner spring, but not the outer. I wonder if they are the wrong caps but they match the right part numbers? Quote Link to post Share on other sites
Chilliman Posted July 7, 2019 Report Share Posted July 7, 2019 Is it just me or do those springs look frighteningly close together? Quote Link to post Share on other sites
BlueTR3A-5EKT Posted July 7, 2019 Report Share Posted July 7, 2019 (edited) Looks like late TR4-TR4A valve caps which go with twin springs, rather than the TR2-3-3A-3B early TR4 ones that are bigger and go with twin inlet/triple exhaust springs. Simple solutions - change caps to early type to match the existing springs or change the springs to later twins only to match these caps. Cheers Peter W PS items 28 & 29 on here may help you. https://www.moss-europe.co.uk/shop-by-model/triumph/tr2-4a/engine/cylinder-head-fittings/cylinder-heads-tr2-4a.html Edited July 7, 2019 by BlueTR3A-5EKT link to Moss cylinder head page Quote Link to post Share on other sites
iain Posted July 7, 2019 Report Share Posted July 7, 2019 (edited) SomethingS look very wrong For comparisons, from Macy's Website.....a normal head Edited July 7, 2019 by iain Quote Link to post Share on other sites
John McCormack Posted July 7, 2019 Author Report Share Posted July 7, 2019 (edited) 21 minutes ago, BlueTR3A-5EKT said: Looks like late TR4-TR4A valve caps which go with twin springs, rather than the TR2-3-3A-3B early TR4 ones that are bigger and go with twin inlet/triple exhaust springs. Simple solutions - change caps to early type to match the existing springs or change the springs to later twins only to match these caps. Cheers Peter W PS items 28 & 29 on here may help you. https://www.moss-europe.co.uk/shop-by-model/triumph/tr2-4a/engine/cylinder-head-fittings/cylinder-heads-tr2-4a.html The collars are part no 821-200, double springs TR2-4A. Are the 821-205 larger diameter? I'm not using the third spring on the exhaust, they aren't needed for normal motoring and often bind. Maybe wrong springs. They are part no 831-000 which should be compatible with the collars. Edited July 7, 2019 by John McCormack Quote Link to post Share on other sites
BlueTR3A-5EKT Posted July 7, 2019 Report Share Posted July 7, 2019 17 minutes ago, John McCormack said: The collars are part no 821-200, double springs TR2-4A. Are the 821-205 larger diameter? I'm not using the third spring on the exhaust, they aren't needed for normal motoring and often bind. Maybe wrong springs. They are part no 831-000 which should be compatible with the collars. 821-200 are for double springs which are a smaller external diameter than the 'triple' arrangement. Looks like you need collar 821-205 to match your spring set. Your 'triple' spring set I am guessing is 831-000 Link to Moss USA https://mossmotors.com/triumph-tr2-3-4/engine-performance/cylinder-head-1502 Cheers Peter W Quote Link to post Share on other sites
John McCormack Posted July 7, 2019 Author Report Share Posted July 7, 2019 6 minutes ago, BlueTR3A-5EKT said: 821-200 are for double springs which are a smaller external diameter than the 'triple' arrangement. Looks like you need collar 821-205 to match your spring set. Your 'triple' spring set I am guessing is 831-000 Link to Moss USA https://mossmotors.com/triumph-tr2-3-4/engine-performance/cylinder-head-1502 Cheers Peter W Thanks Peter. I have come to the same conclusion. I'll try to offload these collars and find some 821-205. At least I don't have to rush, I want to run the engine in using the existing high port head. Quote Link to post Share on other sites
BlueTR3A-5EKT Posted July 7, 2019 Report Share Posted July 7, 2019 5 hours ago, John McCormack said: Thanks Peter. I have come to the same conclusion. I'll try to offload these collars and find some 821-205. At least I don't have to rush, I want to run the engine in using the existing high port head. Have you tried both the manifolds, inlet & exhaust, you intend to use on both the high and low port heads? There is a clamping mismatch, from memory. Cheers Peter W Quote Link to post Share on other sites
John McCormack Posted July 8, 2019 Author Report Share Posted July 8, 2019 10 hours ago, BlueTR3A-5EKT said: Have you tried both the manifolds, inlet & exhaust, you intend to use on both the high and low port heads? There is a clamping mismatch, from memory. Cheers Peter W Yes, there are differences between low and high port head exhaust manifolds. I have a low port manifold and just yesterday put both inlet and exhaust manifolds on to check fit. All good.. Quote Link to post Share on other sites
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