Cummins/Onan B43 / B48 — Deglazing Cylinder Bores
Maintenance · cylinder block
For the Cummins/Onan B43 / B48, from the Cummins/Onan service manual.
Applies to: Cummins/Onan B48
Before you start
- Improper cylinder cleaning will result in engine damage. Do not use gasoline, solvents, or commercial cleaners to clean cylinder bores.
Procedure
- Wipe cylinder bores with a clean cloth dipped in clean, light engine oil.
- Use a brush type deglazing tool with coated bristle tips to produce a crosshatch pattern.
- Use a slow speed drill to drive the deglazing tool; move it up and down in cylinder (10 to 12 complete strokes) rapidly enough to obtain a crosshatch pattern.
- Clean cylinder bore thoroughly with soap, water and clean rags until a clean white rag shows no discoloring.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- 10 to 12 complete strokes
Full service-parts list: Cummins/Onan B48 →
Source: Cummins/Onan service manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.