Limiting factor for changing the belt size is how easy it is to slip over the two pulleys while installing. Solution to get a slightly too short belt on might be to position belt on both pulleys before sliding the flywheel into position on the crank studs. Another trick is go with the next narrower belt width and shorter belt length.
So progressively shorter belts in sequence might be 17365 - 17360 - 15355 (sits deeper in pulley so slightly more distance between pulleys) - 17355 - 15350 and so on. Note, check that the narrower belt does not bottom out in the pulleys. Alternator installations are not all the same- bracket geometry, alternator to case clearance, alternator housing diameter, bracket shape, so there isn't a 'common' belt size for all.
If engine sag is the causal factor of the problem, solution might be new engine mounts, or adding a shimming washer to the bottom mounts, tilting the front of the engine up. Or.. form a clearance blister in the cowling, making the blister is much easier than dealing with the paint color match after...
Time to slow down the Builder Assist operation & concentrate on finishing my own stuff & fly the 6A.
My 'retirement' activities list;
Mon - 6 build project to finish
Tues - 6 upgrade project, canopy, panel, interior & fairings
Wed - 9A salvage rebuild, wing, firewall, gear, engine
Thurs - 7 salvage rebuild (was second plane I built, the Turbo Subie) for a buddy
Rest of week - belongs to the wife!
Last edited by Ralph Inkster : 01-20-2020 at 11:51 AM.