David123 Posted January 7, 2021 Report Share Posted January 7, 2021 Hello, I am trying to rebuild a 348 and only have a parts list, no proper manual. Before taking it to bits, the gears changed but after a mechanic friend fitted bearings and seals and clutch and reassembled, at most 1 and 2. I took the left side case off and found the situation in pic 1 The punched dot is lined up with the dash, which should be right? The parts list has parts as shown in pic 2, which were and are completely missing, and they wouldn't fit because there is no square-section fitting in the middle of the gearwheel as shown in pic 2. Can anyone help please? Quote Link to comment Share on other sites More sharing options...
cleanorbust Posted January 7, 2021 Report Share Posted January 7, 2021 Usual cause of only getting 1st and 2nd gear is that the pawls carrier is fitted upside down. The slot which holds the pawls looks central, bit isn't quite. Whip off the carrier, turn it through 180 degrees, refit and see if you can then get all gears. Quote Link to comment Share on other sites More sharing options...
barnesy Posted January 7, 2021 Report Share Posted January 7, 2021 Hi David, The parts diagram is for a later 348 motor, if your selector mechanism is like the photo then you have an earlier motor there is nothing missing. if you can only get two gears then you will need to loosen the bolt on the eccentric cam (above the stamped 6) and adjust until you can get all the gears. When the dot lines up with the mark you should be in neutral, its a matter of turning the eccentric a little tighten up the bolt then try the gears if you can get them all go back to neutral and adjust a little further. Hope that helps Quote Link to comment Share on other sites More sharing options...
nh014 Posted January 7, 2021 Report Share Posted January 7, 2021 Barnesy is correct. The parts diagram is for a later 348 and the 349. To make the adjustment first remove the clutch. Spin both shafts so that all 5 gears can be selected with a minimum of further turning of the shafts. The shift detent plunger and spring must be in place. Set the eccentric in the middle of its range. Now shift down into 1st and release the shift lever. If you see that the shift drum moves (ever so slightly) as you release the lever, then you need to adjust the eccentric. The plan is to have each downward movement of the lever put the shift drum in exactly the correct position. The shift detent plunger should not "assist" in rotating the drum even slightly, after you let go of the shift lever. Now pull the lever up into second gear. Release the shift lever. Once again, you should not see any further movement of the shift drum after you release the lever. If you do, then you are moving the drum too little, or too much, and that is what the eccentric adjusts for. There are other variables in this issue by the way. If the shift pawls are worn or damaged from impact on the shift lever, then you will not get the expected movement of the shift drum. If internal shimming of the 3 transmission shafts allows too much end movement, then you will not be placing the shift fork where it needs to be to select gears properly. If internal shimming of the 3 shafts puts one or more shaft out of line with the others, then you will not get the positive gear selection you need. Quote Link to comment Share on other sites More sharing options...
David123 Posted January 8, 2021 Author Report Share Posted January 8, 2021 Thanks very much for the answers, they sound very constructive and helpful. Now I just have to try them out! Quote Link to comment Share on other sites More sharing options...
barnesy Posted January 8, 2021 Report Share Posted January 8, 2021 Good luck and let us know how you get on !! Quote Link to comment Share on other sites More sharing options...
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