Cummins/Onan — Drive Belt, Alternator - Adjust
Adjustments · Alternator drive belt
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 roll a belt over the pulley or pry it on with a tool.
Procedure
- Loosen the adjusting screw.
- Loosen the adjustment link locking capscrew.
- Loosen the pivot capscrew and nut.
- Measure belt tension with gauge ST-1293.
- Turn adjusting screw clockwise to tighten belt to specification.
- Tighten adjusting screw locknut.
- Tighten adjustment link locking capscrew to 80 N·m.
- Tighten pivot capscrew and nut to 47 N·m.
Tools required
- ST-1293 Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- 80 N·m link capscrew
- 47 N·m pivot capscrew
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.