Compatible — Engine Disassembly

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

Procedure

1. Drain crankcase.
2. Disconnect all exhaust lines and electrical lines.
3. Remove engine from its mountings and place ona
4. Remove all housings, shrouds, blower housings,
5. Remove flywheel, using a puller.
6. Remove the gear cover, being careful to protect
7. Remove the crank gear, using a gear puller and
8. Remove all accessories such as oil filter, starter,
9. Remove breaker point box.
10. Remove oil base, oil pump and cylinder heads.
11. Remove valves, springs, lifters, etc.
12. Remove camshaft and gear assembly.
13. Remove connecting rods and pistons.
14. Remove rear bearing plate.
15. Remove crankshaft.
16. Remove front bearing.
17. Use the proper bearing driver to install front main
18. Insert rear main bearing in rear bearing plate.
19. Insert crankshaft and rear bearing plate.
20. Install crank gear.

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.