500 balance shaft

Lyndoneil

Lyndoneil

Full member
Location
Towcester uk
I've stripped down the clutch side of the engine to check out the gear selector positioning, when I removed the crankcase cover the balance shaft came with it and sort of fell out.
Just wondering if it matters in what position relevant to the right piston being at TDC it should be put back in at. The workshop manual I have doesn't show the shaft existing as it's for the early ones, I'm  guessing it does not matter,  but I oftern guess wrong with bad consequences.
 
I know naught about 500?s ...... but. Logic says if it?s a balance shaft, just whacking it back willy nilly isn?t going to be right. I could be wrong again, but ...........
 
Hi ,
Yes it does matter.

Set no1 pistion (left one) at TDC.
Place balance shaft in with its straight edge parallel with the BASE gasket line.

Not the best person for words, by all means give me a ring on 01905 355443.

Andy
 
To make it work properly it does matter and I am pretty sure there is a drawing somewhere in the 500 books and I am pretty sure with the piston at TDC the flat on the counterweight is parallel with the base joint on the cylinder.
 
Maybe it should be added the bobweight should be below its axle with the straight edge parallel to the base gasket face when inserted.  May seem obvious to most, but I've actually seen different... ::)

piet
 
Unfortunately  I've set the engine at number 2 cylinder (right) at TDC, any ideas from that setting? Can change it but as ive marked the pickups it that position will have to refit the pickups rotor and crankcase to make sure the timings right.
 
The bobweight counters the RH crank webs. 

The balance weight must be synched with the cylinder further away to be able to reduce the rocking couple.  Synched with the closer cylinder will probably reduce the balancing effect somewhat.  The single small bobweight can only effectively counter a part of the total rocking forces, the later OR600 and Zane-era engines got a proper balance shaft spanning the entire width of the engine with bobweights at each end.  Made for a much smoother engine when compared to the 500.

No need to disturb the pick ups when removing the clutch cover, the rotor is pinned, so that ain't no hassle either...

piet
 
The whole point of the exercise in the first place was to get the clutch drum off so that I can see why it's not selecting through the gears properly
 
I've  just had a crawl on the floor to take a peek at the selector mechanism and it appears the wheel on the outside gear selector arm is missing :o no idea where it's gone, nothing fell out when I removed the crankcase, amazing I got any gears.
 
Lyndoneil said:
I've  just had a crawl on the floor to take a peek at the selector mechanism and it appears the wheel on the outside gear selector arm is missing :o no idea where it's gone, nothing fell out when I removed the crankcase, amazing I got any gears.
Click to expand...

Wow.

Paul
 
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