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Replace Flywheel bolts? #758310
12/06/18 2:33 am
12/06/18 2:33 am
Joined: Feb 2018
Posts: 110
Oklahoma
T
Tracey Spear Offline OP
BritBike Forum member
Tracey Spear  Offline OP
BritBike Forum member
T

Joined: Feb 2018
Posts: 110
Oklahoma
For my first A65 rebuild I've almost got the crank assembly ready for balancing. The new pistons, pins, clips, rings, and rods weigh +30 and +35 grams over the original. And that's without the big end shells. One of the original pistons is +5 grams heaver than it's mate. I haven't weighed the old shells but I'm guessing that's easily 10 grams maybe more. So that's an extra 75-80 grams over original.
Is that even worth bothering over? Am I overthinking it?

I was surprised by how little gunk was in the sludge trap, maybe 1/8 inch. I soaked in mineral spirits and kept cleaning until the solvent came out clear. The original flywheel bolts appear in good shape. Is it advised to reuse the flywheel bolts, or should they be replaced just because?

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Re: Replace Flywheel bolts? [Re: Tracey Spear] #758358
12/06/18 3:15 pm
12/06/18 3:15 pm
Joined: Feb 2018
Posts: 110
Oklahoma
T
Tracey Spear Offline OP
BritBike Forum member
Tracey Spear  Offline OP
BritBike Forum member
T

Joined: Feb 2018
Posts: 110
Oklahoma
Yes. I removed the tube, soaked and cleaned. Cavity and oil passages were soaked and cleaned till I could run clear mineral spirits through it and the solvent stays clear. Going back the rods weigh 410 gm each - shells, and the piston assemblies weigh 425 gm each. A total of 835 gm on each side.

Re: Replace Flywheel bolts? [Re: Tracey Spear] #758360
12/06/18 3:34 pm
12/06/18 3:34 pm
Joined: May 2013
Posts: 5,593
West Yorkshire
Allan Gill Online happy

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Allan Gill  Online Happy

BritBike Forum member

Joined: May 2013
Posts: 5,593
West Yorkshire
I replace flywheel bolts because you don't know the stresses they have been under but many don't. Ive had motors done with original bolts (before I knew any better) I've checked them after a period of running and found them no longer tight... so each to their own, I like to think of it as cheap insurance.

As for rods and pistons etc, try as much as you can to get the weights of the 2 sides equal, it'll help a lot before you start doing any dynamic balancing.


beerchug

Moderated by  Allan Gill, Jon W. Whitley 

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