Ian Vincent Posted August 21, 2018 Report Share Posted August 21, 2018 Good afternoon everyone, As I have mentioned in a previous thread, I am planning to remove the gearbox this coming winter. Whilst I have access to the back of the engine, I am going to have a look at the flywheel. When I rebuilt the engine I re-installed the flywheel and its ring gear in the same configuration as when I dismantled it. Since then I have installed a hi torque (pre-engaged) started. I have read various posts on the forum stating that I should have reversed the ring gear to match the fact that the pre-engaged starter gear would engage from the engine side of the flywheel as opposed to from the gearbox side with the original starter. I have also seen posts suggesting that because the modern starters are pre-engaged it doesn't matter as long as there is a chamfer on the teeth of the starter motor and that it can even be preferable to provide a positive engagement. Is there a definitive answer? Rgds Ian Quote Link to post Share on other sites
Lebro Posted August 21, 2018 Report Share Posted August 21, 2018 I have a modern starter on my early '3 Ring gear is original shrunk on one. The motor, being pre-engage, has no trouble fully engaging every time. Bob. Quote Link to post Share on other sites
Fireman049 Posted August 21, 2018 Report Share Posted August 21, 2018 Hi Ian ~ When I fitted a hi-torque starter to my 3A I didn't reverse the ring gear and have never had any problems with the set-up. Regards ~ Tom. Quote Link to post Share on other sites
Hamish Posted August 21, 2018 Report Share Posted August 21, 2018 Hi Ian ~ When I fitted a hi-torque starter to my 3A I didn't reverse the ring gear and have never had any problems with the set-up. Regards ~ Tom. Same for me. Quote Link to post Share on other sites
dwaters Posted August 21, 2018 Report Share Posted August 21, 2018 I fitted a Wosp Denso starter earlier in the summer and kept the shrunk on flywheel in its original orientation. There is plenty of engagement between both sets of teeth but make sure you specify the right pinion as there are three sold as being for a 3A on the market but only one works. Guess which one I fitted last. Unhelpfuly I cant remember which pinion it was but I tried 9 and 10 tooth pinions of different diameters before finding the one that works. I would recommend talking to Rob at TRGB and asking him which one he supplied to me as it works perfectly. Quote Link to post Share on other sites
Ian Vincent Posted August 22, 2018 Author Report Share Posted August 22, 2018 Thanks for all the replies. I'm pretty sure that I have the correct starter because it was bought for a post 60k TR3a and has been in use since October 2014. I guess if it had the wrong number of teeth it would have cried "enough" long ago. Rgds Ian Quote Link to post Share on other sites
Graham Harris Posted August 23, 2018 Report Share Posted August 23, 2018 I found a PO had reversed the ring gear on my 59 3A which was not a good idea because the chamfer is on the other side of the tooth to the one on the starter pinion so best left where it is in case you want to change back to the original starter. Graham Quote Link to post Share on other sites
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