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Mainshaft Assembly - Rear Half
Next a new 1st/2nd gear synchro unit. The synchro teeth on my original were badly worn. If you don’t plan to replace this, be careful dismantling it. This is the unit with three steel balls held in by firm springs, which are released all across the workshop when the outer gear is slid off the inner gear. They are tiny. I lost one somewhere in the next room. At least thats where the pinging sound came from.
The thrust washer sits against the shoulder of the splines on the mainshaft. Checking the end float against the bush, which will effectively be the end float for 1st gear. Though this needs checking against the gear as well.
1st gear in place. And that is the mainshaft complete. The thrust washer buts up against the roller bearing pressed into the rear of the gearbox casing.
New first gear compared the the old gear. I replaced pretty much every gear that has synchro teeth. I purchased Britpart for all of the new gears. Probably not as good as purchasing original OEM, but about a tenth the cost. If I insisted on using only original OEM gears, this rebuild would not be happening.