PGK's beemer with a big update!

[PGK]

Made progress today, just not as much as I had hoped. I need new crank main bearings, but the good news about that is that i need them in the stock size, not oversize. i'll take care of that sometime this week, i would have done it today but if you do that you also have to check crankshaft endplay and replace the thrust bearings, which i did not feel like doing. that's something that you do only when you are ready to completely assemble the motor.

The flywheel forms an integral part of the crankshaft assembly. if it is not attached, the crank can slide forward, and the thrust bearings can come out of location, taking with them their locating dowel pins. this sucks 'cuz then you have to tear the motor down again.

what i did do today was measure the crank, clean some stuff, and balance the top end.


Pistons and wrist pins.


remember sig figs!


see the little numbers? and the tabs a little inside from the base of the skirt? yeah, those are on their way out.


spot the difference!

when all was said and done, each piston/wrist pin assembly weighed 503.7 grams.


that's aluminy. you can't stick a magnet to it, nor is it in any way poignantly funny.

i mentioned in my last post about adding 40mm carbs....

stock 32 on the left, new 40 on the right.


stud pulling. to sandblast the case, i had to tape over every oil passageway, and put a bolt into every threaded hole. even with all that, the oil filter compartment was full of sand.

here's an after picture:


and here is the block with crank:


cylinders:


my dog in the sink:

[/img]