Cummins/Onan — Align Cooling System Fan Drive (Spec. B)
Adjustments · Fan drive pulleys
From a Cummins/Onan service manual — check it applies to your exact model before use.
Applies to: Cummins/Onan DQKB, Cummins/Onan DQKC, Cummins/Onan QSK60 engine
Before you start
- The fan belt idler is under tension. Do not allow hands between the idler and the belt or the fan hub.
Procedure
- Use a long straightedge to align the crankshaft pulley to the fan drive pulley.
- Fan drive pulley should be 0.25 inch nominal toward engine from straightedge.
- Mark current and estimated new fan pulley location on shaft.
- Remove two fan pulley bushing screws; install one into threaded hole to separate bushing.
- Move bushing to the new location mark.
- Install the two screws into the bushing and tighten alternately to 67 ft-lbs (91 N·m).
- Recheck alignment and repeat until achieved.
- Install drive belt using 8-point socket and breaker bar to relieve idler spring tension.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- 67 ft-lbs (91 N·m) bushing screws
- 0.25 inch fan pulley offset
Full service-parts list: Cummins/Onan DQKB →, Cummins/Onan DQKC →
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.