Ade_TR6 Posted July 8, 2014 Report Share Posted July 8, 2014 Just looked at a very informative set of YouTube videos on an A type gearbox rebuild. It didn't look too difficult, at least less daunting than I thought. So the question is, do I have a stab at it myself or hand to a professional? Quote Link to post Share on other sites
AlanT Posted July 8, 2014 Report Share Posted July 8, 2014 I have done this. You need to be a good mechanic with a bit more stuff than just a few spanners. The tricky bit is the layshaft and its bearings. I made quite a few tools to do bearing pushing and pulling. Some of the fits are quite tight. Quote Link to post Share on other sites
dingle Posted July 8, 2014 Report Share Posted July 8, 2014 This site has excellent articles on rebuilding the gearbox&OD- http://www.buckeyetriumphs.org/technical/technical.htm As Alan (and the Buckeye articles) mentioned there are several tools that can be made to substitute for the Churchill tools mentioned in the manuals. If you do not have the facilities to make these tools, you might find a person in your area that would be willing loan them as well as help with the rebuild. OTOH, some people have rebuilt trans. with only a big hammer&punch-not recommended. Berry Quote Link to post Share on other sites
Guest ntc Posted July 8, 2014 Report Share Posted July 8, 2014 It is the quality of parts you can get will also be your problem . Quote Link to post Share on other sites
Ade_TR6 Posted July 8, 2014 Author Report Share Posted July 8, 2014 Isn't this also a problem for the professionals as well? Quote Link to post Share on other sites
TRTOM2498PI Posted July 8, 2014 Report Share Posted July 8, 2014 (edited) Agree with NTC. Decent quality gear thin on the ground. Edited July 8, 2014 by TRTOM2498PI Quote Link to post Share on other sites
AlanT Posted July 9, 2014 Report Share Posted July 9, 2014 Presumably this is about the syncro rings. The bearings are all standard Imperial sizes. Check with a reputable bearing supplier. Quote Link to post Share on other sites
AlanT Posted July 9, 2014 Report Share Posted July 9, 2014 (edited) Here are the turned bushes I made to press the bearings and oil seals: https://flic.kr/p/nYRpxD You can get the spring-ring off with screw-drivers or make some wedges: https://flic.kr/p/oeiKJb For removing layshaft bearings, the big jaws if the bearing has a gap behind as it should do and the small jaws against the bronze bush to get hold of a bearing thats been pushed too far in: https://flic.kr/p/oghZY9 You could tap the races of the new layshaft bearings in with a punch I suppose or pull them in with this: https://flic.kr/p/oga5v3 For pressing the mainshaft back through the new bearing, this protects the end, note how I am using aluminium: https://flic.kr/p/nYSoZk There are two more tools, I'll take pictures when I find them. You could probably do without any of this by banging about with drifts and chisels. Would do some damage most likely and this would have taken me a lot longer to do. We had a recent topic here, in which the input shaft had not been fitted right and the car would move a few feet then "lock-up". Tooling like this helps to get the fit right. Edited July 9, 2014 by AlanT Quote Link to post Share on other sites
Ade_TR6 Posted July 9, 2014 Author Report Share Posted July 9, 2014 Top job, fancy selling these as a kit? Quote Link to post Share on other sites
Nick Jones Posted July 9, 2014 Report Share Posted July 9, 2014 It is possible for a competent and experienced DIYer. The Buckeye guide is very good. Very few special tools are really needed and can be improvised. It helps to have another box (maybe a cheap non-OD saloon box even which has many shared parts) to donate things like synchro rings (1st, 4th syncho baulk rings are usually ok and sometimes 3rd too). It is true to say that the the quality of the result will depend rather alot on how knackered your starting point is. You'll never get a top result from a 'box that is thoroughly worn everywhere. This is where a good donor non-OD box might become invaluable - donating almost everything but mainshaft! Nick Quote Link to post Share on other sites
AlanT Posted July 9, 2014 Report Share Posted July 9, 2014 Sorry I hate doing any kind of rep work for production. I am pleased to offer advice/help to anybody doing this job. Quote Link to post Share on other sites
John Morrison Posted July 9, 2014 Report Share Posted July 9, 2014 Whats your location Ade? John. Quote Link to post Share on other sites
dingle Posted July 10, 2014 Report Share Posted July 10, 2014 Very impressive and well made tools. The main shaft and cluster gear are very hard and won't be damaged by tools made of mild steel. I made the comment about rebuilding the gearbox with a hammer and punch in jest, but on another forum, a person did suggest that was all that was needed. Berry Quote Link to post Share on other sites
AlanT Posted July 10, 2014 Report Share Posted July 10, 2014 Wherever possible I make these things from Aluminium. Its not so much about avoiding damage to the gbox parts, although that does come into it. I can cut Aluminium at three times the rate of Steel. This avoids boredom. But Aluminium is expensive and often I have a piece of steel scrap. The "jaws" of the layshaft extractor are marine grade stainless. This is extremely tough and hard and takes twice as long to cut as mild-steel and needs messy coolant and tool sharpening. Anybody could make the "wedges". Hacksaw, file, mild-steel, an hour or so. Quote Link to post Share on other sites
Ade_TR6 Posted July 10, 2014 Author Report Share Posted July 10, 2014 Whats your location Ade? John. John, down in Surrey. Quote Link to post Share on other sites
Ade_TR6 Posted July 10, 2014 Author Report Share Posted July 10, 2014 Very impressive and well made tools. The main shaft and cluster gear are very hard and won't be damaged by tools made of mild steel. I made the comment about rebuilding the gearbox with a hammer and punch in jest, but on another forum, a person did suggest that was all that was needed. Berry Berry, that is exactly how the gearbox was done in the YouTube videos, hence my original question as he made the process look a lot less daunting. Ade Quote Link to post Share on other sites
AlanT Posted July 10, 2014 Report Share Posted July 10, 2014 Did he do the layshaft? Quote Link to post Share on other sites
Ade_TR6 Posted July 10, 2014 Author Report Share Posted July 10, 2014 Here is the link. He does the whole gearbox via a number of videos. Someone on here may recognise the chap going the work... Apart from a cock up at the end it looks quite straight forward. http://youtu.be/WINJTzyWD6Y Quote Link to post Share on other sites
AlanT Posted July 10, 2014 Report Share Posted July 10, 2014 Here are two tools that anyone could make. This one pulls the big bearing with the circlip-groove: https://flic.kr/p/oeXPr5 And this one pulls the mainshaft: https://flic.kr/p/ogP3Pw Both work with two lengths of 12mm studding. Quote Link to post Share on other sites
AlanT Posted July 10, 2014 Report Share Posted July 10, 2014 Just watched the video where he takes out the beariing with the circlip. Looks like this box has been apart before and quite recently. A few taps and it slides out. This bearing was really tight on mine. You would have done a lot of hammering. Quote Link to post Share on other sites
dingle Posted July 10, 2014 Report Share Posted July 10, 2014 The video is very entertaining, but much of it is based on the VTR (Greasy Hands) tech articles. http://vintagetriumphregister.org/maintenance/ Which are quite similar to the Buckeye articles. Anyway, I think you will find the trans./OD rebuild an enjoyable experience and a lot less daunting with the help availble on the internet. Berry Quote Link to post Share on other sites
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