Navigator engine rebuild

Hi Philip.

You will have to drill the hole through the bush. The lack of a reply so far probably means no-one has done this. I haven't either.

I'm assuming you want to do it yourself. Perhaps a job for someone who understands the difficulties.

The hole diameter is 3/32 ins. A drill of this size gripped in a pin chuck is suggested. 

Your crankcase drive side must be stand-alone. The hole is drilled while the drive side crankcase is assembled, and before it is attached to it's partner timing side. The bush is pressed home into the crankcase half.

You won't have access for a standard drill/screwdriver because of the lack of access. You need a pin chuck with generous shaft length.

The bush can be drilled with a hand drill on the pin chuck. The bush material is relatively soft. The drill is located by the hole in the aluminium bush housing.

My second recommendation is to take your time and don't push hard on the drill. It could break off.

Let's see if some recommendations come from someone who has done this.

Couple of photos of a drilled bush. Of course this hole was drilled after the bush was pressed into the drive side crankase, as described above.

Peter

I may be mis remembering but I thought my bush was pinned from the front there being a semi circular cut out on the thrust face? 

I also remember the pinning as being from the front of the bush with a circular cut out. Of course you still need the oil feed hole drilling. You could drill the bush before fitting if you can be sure of lining the holes up after assembly.

Better wait for Philip to clarify. "Daiagonal"

Diagonal hole to me indicated it was not a radial, transverse or axial hole. and that only left one possibility in the bush. The oil feed hole.

Or am I being stupid? Probably.

Peter

Philip,

But did you pin the bush?

David

Phillip, it is always best to pin the bush - if the gearbox oil level drops it is prone to snatching and spinning in the housing, which can quickly wreck the cases. 

Dan