Just when you have been extra careful to make sure everything is 'just so', that is when things will decide to jump out and give you an unexpected and unwelcome surprise, just like we see here ...
I respect your perseverance, this build is truly a learning experience for us the viewers and no doubt with all the twists and turns , your knowledge is also being added to. I feel for the owner who by now must be pulling his hair out. One saving grace is I’m pretty sure this is one project you are definitely determined to see through to a successful ending. Great job Paul 👍👍
I think we've all had issues like that, closely followed by a brief bodge moment !! . . . Glad you resisted, fought back and satisfactorily resolved the situation . . These videos re so informative and interesting - thanks for posting !
Take my word for it, the idea of a steel housing with a pinned phosphor bronze insert is going to cause a few engine seizures for a few unlucky owners, myself included. The problem will never ever re-occur, because I decided that I could not trust the factory made parts, having had a few seizures, and I decided to make a solid one piece timing side bush from phosphor bronze. By doing so, I could also guarantee that there was a " transition fir" ( H7) between the engine crankcase and the bearing, by making the outside diameter custom made for the internal dimension of the crankcase, a shrink fit. On more than one occasion I have suffered seized engines because the pin that locks the staeel outer to the bronze inner slipped, and allowed the inner bronze bearing to obscure the oilways. Never Again will that happen.
Well spotted Paul, I'm sure you'll get this all sorted in the end but it certainly is keeping you on your toes here. I do wonder what on earth BSA were doing considering they had a one piece solution in the A10 (solid bronze bush with a flange to form a thrust surface) to then go to a three piece solution with steel backed white metal bush in a steel liner and seperate thrust washer. As you said in your previous video bush prone to spin, block off the oil supply and /or thrust washer spins gets chewed up and falls out into the bottom of the engine. My understanding is on later models they went back to a solid one piece bush as per A10 so that tells you something!
Yep seen that to Paul over the years. When you think about it these engines could be 60 years old and all sorts of things have been done to em in that time by all sorts of folks with any number of bits and pieces, some of which may even have been right and fitted, some of the folk may have known what they were doing! I admire your fortitude for not going down the bodge route mate!
You may have some Triumph bush parts there as well maybe? But triumph flange is round, I've come across this undersized outer before also, can't think what it was, poor pattern parts? Great investigation and interesting findings.
hi Paul they should all be the same OD give or take a thou it looks like who ever worked on that engine before you had no means of heating the case up to get that bush in so set to and took some off the OD of the bush its a good job he or she did'nt take some off the OD on the cases, now that would of been a problem, fun and games Paul fun and games.
It makes me wonder how much hand fettling went on in the factory to match parts that were manufactured slightly out of spec? A friend who worked in Cowley told me that tolerances on car engine pistons (and bores) were not that tight and slightly oversize pistons were fitted to oversized bores - same for undersize pistons. Cheaper than machining to close tolerances, I suppose.
Hmm - looks like the bush had been turned down for fit in previous engine? Always something to trip you up even when you think you’ve checked everything - that’s engineering for you….🤣 But I know you will bottom everything and get that beeper running sweet like it should 👍
Hi Paul, Great videos on the A65 , I owned a bsa A65 Lightning in the 1970^s And at the time I had a Devimead Roller bearing conversion , Is there still a Roller bearing conversion option and would you recommend it ! ,
