Cummins/Onan — Sacrificial Zinc Plug - Remove, Inspect and Install
Maintenance · Sacrificial plug (zinc)
From a Cummins/Onan owner's manual covering: QSM11, QSM11 Industrial, QSM11 Marine, QSM1i. Check it applies to your exact model before use.
Applies to: Cummins/Onan QSM1i, Cummins/Onan QSM11 engine
Before you start
- Do not use Teflon tape or pipe sealant on the threads; it will insulate the zinc anode.
Procedure
- Shut off the sea water inlet valve on the vessel hull.
- Remove the zinc plug(s).
- Measure length of zinc plug(s) removed.
- Replace any zinc plug 50 percent or more eroded.
- Install and tighten the zinc plug(s) to 44 N·m.
Specs & values
- 44 N·m
Full service-parts list: Cummins/Onan QSM1i →
Source: Cummins/Onan owner's 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.