Crankcase surprises !

R100 · Post by **R100** » Mon Aug 10, 2015 1:19 pm

With the engine upside down I took the bottom case off.
Found two surprises -
This flat washer about 0.8mm thick.
And this homemade spacer boosting the knock pin up almost 3mm.
Can't figure out why someone would do that.
Any ideas?

G-Man · Post by **G-Man** » Mon Aug 10, 2015 5:13 pm

Weird - the washer would would be holdig the cases apart. Did you have any leaks from there? It probably just got there by accident...

As for the spacer under the knock pin. No idea.......

G

R100 · Post by **R100** » Mon Aug 10, 2015 5:22 pm

G-Man wrote:Weird - the washer would would be holdig the cases apart. Did you have any leaks from there? It probably just got there by accident...
As for the spacer under the knock pin. No idea.......
G

Yes - oil on the left of the rear tyre.
Have to wonder what people are thinking when they do such things.

modelman · Post by **modelman** » Tue Aug 11, 2015 6:57 am

The term 'knock up pin', would that be the pin that locates & prevent the bearings from rotating?

If so, one of mine just about disappeared in the hole as I fitted it, the PO must have had the bearing out of place when the cases were tightened & the pressure punched it through the casting, so the hole was now a lot deeper. I cleaned it up & used JP Weld to affect a very good repair.
Double check the area to see if yours is the same.

R100 · Post by **R100** » Tue Aug 11, 2015 8:00 am

modelman wrote:The term 'knock up pin', would that be the pin that locates & prevent the bearings from rotating?
If so, one of mine just about disappeared in the hole as I fitted it, the PO must have had the bearing out of place when the cases were tightened & the pressure punched it through the casting, so the hole was now a lot deeper. I cleaned it up & used JP Weld to affect a very good repair.
Double check the area to see if yours is the same.

In my case it is the pin that locates the left collar of the main shaft where the kick start pawl is.
I will check the depth, thanks.

bamacl · Post by **bamacl** » Wed Aug 12, 2015 9:09 am

Maybe they needed that after the washer was placed there. Some people don't need to be working on things do they.

R100 · Post by **R100** » Wed Aug 12, 2015 10:18 am

bamacl wrote:Maybe they needed that after the washer was placed there. Some people don't need to be working on things do they.

The final step was a very thick layer of liquid gasket.
Some of these things can be sadly humorous.