Cummins/Onan 6GO — Fan Belt Tension Adjustment
Adjustments · Fan belt / fan pulley
For the Cummins/Onan 6GO, from the Cummins/Onan operator's manual.
Applies to: Continental Red Seal Y91-273 or Y91-264 engine
Before you start
- Too tight a belt will have a short life and cause excessive strain and wear on the water pump bearings.
- A belt too loose will slip, wear out rapidly, and result in inefficient cooling.
Procedure
- Loosen the two lock bolts on the fan pulley.
- Turn the front half of the pulley clockwise to narrow the pulley groove and tighten the belt.
- Turn the pulley counterclockwise to widen the groove and lessen belt tension.
- Allow 3/4 in play in the belt.
- Tighten the adjustment lock screws securely and check them frequently.
Tools required
- Wrenches Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- 3/4 in belt play
Source: Cummins/Onan operator'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.