Could I ask for opinions please on the following problem.
The fit of the crankpin into the flywheel should be , Pin at 1.002 and hole in wheel at 1.000 - giving a fitting pressure of approx 6 tons.
As can be seen from the photo`s the test bar at 1.001 is " not right "!!
The Go - No Go gauge in Brass ( smoother surface ) has various diameters of 1.001 , 1.003 and 1.006. As can be seen at 1.006 the gauge disappears. The Timing side is correct at 1.000 ( and a bit )
Several solutions come to mind one being to bore out the hole in the wheel and weld in a insert as per the Drawing. There is probably another 1/16 inch to be had on the outside Diameter of the insert. Using the large Diameter of the Nut recess as a register this can then be bored out to 1.000.
Solution two is to weld " strips " across from front to back ,finishing with a circular run front and back. Face off and bore out.
If you are not already asleep these next points are important
!. I / We will not buy a new oversize pin at 1.125 since we already have a perfectly good ,new Vincent Big End assembly
2 I / We will not buy a new wheel since - in the words of Mr Dunn " unless its a pile of ash everything is salvageable " This oversized hole is just an engineering challenge.
3 I / We have access to ( in order of priority ) Single malt , Coffee and Cake , A Bridgeport Milling Machine , a BIG Colchester Lathe , MIG , TIIG , Gas and arc welders
And a bucket of inspiration ( empty ).
Comments please . Thanks.
The fit of the crankpin into the flywheel should be , Pin at 1.002 and hole in wheel at 1.000 - giving a fitting pressure of approx 6 tons.
As can be seen from the photo`s the test bar at 1.001 is " not right "!!
The Go - No Go gauge in Brass ( smoother surface ) has various diameters of 1.001 , 1.003 and 1.006. As can be seen at 1.006 the gauge disappears. The Timing side is correct at 1.000 ( and a bit )
Several solutions come to mind one being to bore out the hole in the wheel and weld in a insert as per the Drawing. There is probably another 1/16 inch to be had on the outside Diameter of the insert. Using the large Diameter of the Nut recess as a register this can then be bored out to 1.000.
Solution two is to weld " strips " across from front to back ,finishing with a circular run front and back. Face off and bore out.
If you are not already asleep these next points are important
!. I / We will not buy a new oversize pin at 1.125 since we already have a perfectly good ,new Vincent Big End assembly
2 I / We will not buy a new wheel since - in the words of Mr Dunn " unless its a pile of ash everything is salvageable " This oversized hole is just an engineering challenge.
3 I / We have access to ( in order of priority ) Single malt , Coffee and Cake , A Bridgeport Milling Machine , a BIG Colchester Lathe , MIG , TIIG , Gas and arc welders
And a bucket of inspiration ( empty ).
Comments please . Thanks.