Graham Posted June 14, 2019 Report Share Posted June 14, 2019 I'm accumulating parts for the 5 rebuild and wanted an opinion on if I would be better off fitting the later spec TR6 trailing arms or if the 5 spec ones would be OK. I'm assuming that if Triumph went to the trouble to upgrade them they must have had issues with the TR5 spec ones ? Quote Link to post Share on other sites
Dave McDonald Posted June 14, 2019 Report Share Posted June 14, 2019 Graham, I hadn't realised that there differences. What were they? Dave McD Quote Link to post Share on other sites
Graham Posted June 14, 2019 Author Report Share Posted June 14, 2019 4 minutes ago, Dave McDonald said: Graham, I hadn't realised that there differences. What were they? Dave McD Dave the later 6 ones have a bigger re Inforcing rib between the bearing housing to spring seat I only found out because it's in how to restore book by Roger Williams page 135 Quote Link to post Share on other sites
Dave McDonald Posted June 14, 2019 Report Share Posted June 14, 2019 Just read my previous post - apologies for my dreadful English. I race a TR6 and having had some cracks starting to occur in the trailing arms, due to the extreme side loads with wide sticky race tyres at high speed in coners, I had them reinforced with aluminium welded plates underneath. I'll try to find the photos and post them here. It wasn't desperately expensive and has stood the test of time for many years now in the race environment. Dave McD Quote Link to post Share on other sites
Stagpowered Posted June 14, 2019 Report Share Posted June 14, 2019 2 hours ago, Graham said: I'm accumulating parts for the 5 rebuild and wanted an opinion on if I would be better off fitting the later spec TR6 trailing arms or if the 5 spec ones would be OK. I'm assuming that if Triumph went to the trouble to upgrade them they must have had issues with the TR5 spec ones ? I had to replace one of the trailing arms on my TR250 many years ago as the web between the bearing and the spring seat developed a large crack. I have a suspicion that it may have been started by knackered lever arm shocks or extremely rough USA roads as the bump stops were thoroughly battered and the inner arches full of stress cracks when I bought it. I didn't notice it when I rebuilt the car but it spread quite rapidly over the next year or so. Neil Quote Link to post Share on other sites
roy53 Posted June 15, 2019 Report Share Posted June 15, 2019 Could someone show a photo of this difference. Roy Quote Link to post Share on other sites
Dave McDonald Posted June 15, 2019 Report Share Posted June 15, 2019 As promised, see photos of my T/A reinforcement. Photo 32 - underside view of original standard unamended T/A (don't know which type this is, early TR5 or later TR6?) Photo 33 - side view of cracked T/A with weld repair to crack just in front of the hub mating face circle Photo 34 - underside view of the welded plate repair to same cracked T/A. My thinking was that it bridged the crack repair but also transferred loading across from the main hub carrying face to the secondary web on the other side and around the spring pan. It might not be that pretty but it's functional and has not failed since being repaired. Care was required to avoid distorting the face of the hub mating face circle. Dave McD Quote Link to post Share on other sites
rcreweread Posted June 16, 2019 Report Share Posted June 16, 2019 Graham Just taken some photos of a TR5/6 and TR4A trailing arm for comparison purposes. Hope you can see the differences but the TR5/6 one is definitely beefier and is noticeably thicker in some casting areas which you cant really see in the photos. Hope this helps Cheers Rich Quote Link to post Share on other sites
rcreweread Posted June 16, 2019 Report Share Posted June 16, 2019 Graham - sorry , just realised you were wanting to compare a TR5 one with a later TR6 one, not a 4A . I don't know if my TR6 one is an early or late one to be honest but the part number is cast into the side as 308225 V3109 DD2 Cheers Rich Quote Link to post Share on other sites
Motorsport Mickey Posted June 16, 2019 Report Share Posted June 16, 2019 Nice paint finish on those arms, what paint used ? Mick Richards Quote Link to post Share on other sites
rcreweread Posted June 16, 2019 Report Share Posted June 16, 2019 Mick Baufix Aluminium Zinc Spray from Lidl!!! £2.99 for 400ml if I remember correctly and sometimes on offer if you buy more than one. Cheers Rich Quote Link to post Share on other sites
Motorsport Mickey Posted June 16, 2019 Report Share Posted June 16, 2019 Thanks Rich. Mick Richards Quote Link to post Share on other sites
Graham Posted June 16, 2019 Author Report Share Posted June 16, 2019 (edited) 1 hour ago, rcreweread said: Graham - sorry , just realised you were wanting to compare a TR5 one with a later TR6 one, not a 4A . I don't know if my TR6 one is an early or late one to be honest but the part number is cast into the side as 308225 V3109 DD2 Cheers Rich Rich I think your Tr6 arm is the latter type as the 2 ribs which run from the base of the spring pan towards the shock mounting point are the same height on the TR 5 spec ones one rib is smaller/lower , however the shock mount holes on the latter arms are also supposed to be smaller than the earlier arms and in your photo the hole looks the same size as on your 4a arm possibly Ther are a number of variants as Triumph developed the ? But only what I'm surmising from Roger Willams book Edited June 16, 2019 by Graham Quote Link to post Share on other sites
tim hunt Posted June 16, 2019 Report Share Posted June 16, 2019 Slightly off topic but there is nothing wrong with Baufix branded products from Lidl. I used their Teak Oil on two hard wood garden chairs and the results were excellent and long lasting. Tim Quote Link to post Share on other sites
stuart Posted June 17, 2019 Report Share Posted June 17, 2019 On the later arms they are dated on the side which helps to work out what you have Stuart. Quote Link to post Share on other sites
reginald Posted June 26, 2019 Report Share Posted June 26, 2019 Hello On the latest arms the ribs for the shock mounts are larger strengthening the shock mounting point. Richard Quote Link to post Share on other sites
PaulAnderson Posted September 1, 2019 Report Share Posted September 1, 2019 Interesting, out of curiosity are the TR5 trailing arms the same as the TR4A ones? Paul Quote Link to post Share on other sites
RogerH Posted September 1, 2019 Report Share Posted September 1, 2019 essentially yes Roger Quote Link to post Share on other sites
PaulAnderson Posted September 1, 2019 Report Share Posted September 1, 2019 Okay, as I need a new TR4A one and have two in my stash but don’t know / recall their origin. Paul Quote Link to post Share on other sites
saffrontr Posted September 1, 2019 Report Share Posted September 1, 2019 The photos aren't mine however these detail the changes between early and late TR6 arms. Possibly the TR5 arms are the same as the early TR6. Derek Quote Link to post Share on other sites
stuart Posted September 2, 2019 Report Share Posted September 2, 2019 22 hours ago, PaulAnderson said: Interesting, out of curiosity are the TR5 trailing arms the same as the TR4A ones? Paul No as the bump stop changed from the 4a style where the bump stop was mounted on the wheel arch box to the bump stop being mounted on the trailing arm. Stuart. Quote Link to post Share on other sites
PaulAnderson Posted September 4, 2019 Report Share Posted September 4, 2019 (edited) Is there any chance that Triumph saloon trailing arms could be mistaken for TR items or are they also of the same specification? One of my two spare trailing arms has Stanpart written on the side but not the other. There’s also three rows of text, the first being the numbers 307053 then what I think is V2969 and then something I can’t read. Hoping it’s a suitable replacement. Paul Edited September 6, 2019 by PaulAnderson Photo added Quote Link to post Share on other sites
Tom Fremont Posted September 4, 2019 Report Share Posted September 4, 2019 The lightness of these arms can be frightening to the uninitiated considering the loads they see. TRIUMPH went to great lengths to keep their cars light; more than they're credited with. Tom Quote Link to post Share on other sites
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