The type 3 motor i recently obtained was said to be a good runner, no smoke, no noise/bang/rattle, with a miss in cylinder 3 and that is all.
having a look, pistons/barrels look excellent! despite soot from a rich run. even the piston rings look great, factory machining lines for the pistons are still on there.
however, whilst cleaning my block, (with the pulley off, only the flywheel attatched to the crank shaft)... i can physically pull it and push it in and out by a matter of a huge amount! i will measure it.. but friggen huge compared to 0.003 to 0.006 inch factory specs.
its like, a mm and a bit.
Does it make a difference if the crankshaft pulley is not fitted? it current isn't fitted and wasn't while i was moving the crankshaft. however, every video i have seen that pulley has been attached. and i'm wondering whether the pulley itself takes up some of the slack, and hence with it removed, caused me to have this scare.
otherwise its a new main bearing, align bore for me, if the case hasn't been pounded by the moving crankshaft.
i have a set of vernier calipers... i spose what i will do (tight arse method lol) i push the crank as far in as i can and out, measure both as a distance from the case and find the difference.
dial indicator on the flywheel is the best way to get a truely accurate measurement
have you dropped the flywheel off to make sure theres 3 shims in there?
i once scored an engine with about 2mm play which i thouight the worst with but found it only had 1 shim in there
the oil pressure when hot will give a bit of an indication of whats going on if the front bearings pounded out
If you take the flywheel off, push on the face of the main bearing and see if it moves, if not get someone to push on the crank from the other end while you look at the bearing to see if it moves or use your verniers if you cant get a dial indicator.
Another way to measure end float is makeup a solid adjustable stop against the flywheel, then you can measure it with feeler gauges.
nah reduces, basically its packing up the crank so it cant move as much
Chris that really is FA, some thicker shims will take care of that
i had a 71 1500 bug with a 1600 twiny that i sold to mate
it had abit of crank movement 😂
from out at the farm into Lismore which is 19KMs it would go from the full mark on the dipstick to the add mark.
and i wasnt burning it either, pumping it all out passed the main bearing 🤪
when i finally dropped the engine out and chucked the dial indicator on it only had.....4.6mm float
