Reworking and Reaming the Crankcase

General
Reaming of the light-alloy Silumin Crankcase for B bearings is done in two steps. When reaming the bearings, always grease the reamer using white spirits.

1st step = roughing reamer: 65.20 mm dia.
2nd step = finishing reamer: 65.25 mm dia.

Reaming





1. Fit shop-made tool to crankcase and tighten in a vise.
2. Place end bearing bushing EL 35 in bearing bore 1.





3. Place end bearing bushing EL 35 in bearing bore 8 and align using the guide rod.

Guide Rod Support Attachment (Part 1 Of 2):

Guide Rod Support Attachment (Part 2 Of 2):

4. Now attach and align both guides for support of the guide rod.

NOTE: When tightening the guides, make sure the guide rod does not bind, i.e. the guide rod must be checked for free rotation during the whole tightening process.

5. Remove end bearing bushings after tightening and aligning, respectively.





6. Insert guide rod complete with reamer into bearing 8 and ream all bearing bores slowly and steadily.

NOTE: Have an assistant apply liberal amounts of white spirits for greasing while the bearing bores are reamed to the correct size.