Compatible — Inspection

For these models: 3054 Marine Engine, 3054 Marine Engine (Turbocharged), 3056 Marine Engine.

Procedure

1. Make a thorough check for cracks. Minute cracks
2. Inspect all machined surfaces and threaded holes.
3. Check top of block for flatness with a straight
4. Check cylinder bore for taper, out of round and
5. Record measurements taken at top and bottom of
6. Make sure cutting tool is properly ground before
7. Besure top of engine block is smooth and deposit
8. Clean base of boring bar before bar is set up.
9. Makean initial rough cut, followed by a finish cut.
10. Position block solidly for either vertical or hori-
11. Follow hone manufacturer’s instructions for the
12. Insert hone in bore and adjust stones to fit snugly
13. Connect drill to hone and start drill. Feel out bore
14. Check diameter of the cylindner regularly during
15. Crosshatch formed by the stones should form an
16. Clean cylinder bores thoroughly with soap, water
17. Dry crankcase and coat it with oil.
18. Wipe cylinder bores with a clean cloth which has
19. Use a brush type deglazing tool with coated
20. The deglazing tool should be driven by a slow

Source: manual:965-0161 Onan B48M Operator's and Service Manual (3-1985).pdf. Figures and steps are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.