DuroSpeed
™
INSTALLATION | SERVICE
Proper precautions must be taken to prevent personal injury from contact with moving parts, unintended engine
start, or other hazards present when working with powered equipment. Refer to the vehicle owner's manual and/or
appropriate service manual for proper safety precautions before beginning any diagnostic or repair procedures.
This fan clutch requires 90-120 PSI (6.2-8.2 bar) air pressure to DISENGAGE. The air pressure is vented to
ENGAGE the fan. Any interruption of the air supply will cause the fan to run, keeping it in fail-safe mode.
Maintenance
Fan clutch maintenance should be performed at every “A” PM schedule, at every
oil drain or every 25,000 miles (40,225 km), whichever comes first.
1. Verify clutch operation. Turn key or jump the control system so that 90-120
PSI air pressure is supplied to the clutch. Clutch should disengage and turn
freely. Remove air supply. Clutch should lock up and be difficult to turn by
hand.
2. With engine stopped and clutch disengaged, check for air leaks at front of
clutch and between the clutch and drive hub.
3. Inspect electrical and air connections at solenoid.
4. Examine wire and airline routing for damage and chafing. Repair as required.
5. Check exhaust port on solenoid for restrictions and debris. Remove any
obstructions to ensure positive engagement.
CONTENTS
DuroSpeed
™ Clutch
Technical
Bulletins ….…………………………
1
Maintenance …..………………………………..
1
Lining Maintenance …………………………..
1
Retro-fit
Kit Installation ……………….…….
2
Clutch Installation
……………………….…….
3
Technical Bulletins
Engine overcooling in colder climates may occur with any 2
speed fan clutch application. If over cooling is experienced,
the BorgWarner DuroSpeed™ fan clutch can be easily
converted to On/Off operation by simply applying kit 1033-
52900-01 . The kit includes components to help protect the
magnets from foreign metallic debris when in the On/Off
configuration. The Conversion kit must be used to convert
the DuroSpeed™ fan clutch from 2 speed to On/Off.
1
DuroSpeed
™
INSTALLATION | SERVICE
WARNING!: Always use care in handling the magnet ring. Any interaction with a metallic object may cause
a pinch point that could result in personal injury.
Lining Maintenance
Clutch Lining Maintenance
It is important to inspect fan clutch lining condition on a regular basis.
Lining Wear Check
Start with the fan clutch engaged (no air pressure to the clutch). If necessary,
disconnect the air line from the clutch. Place a United States Dime against the
cooling fins as shown in the images to the right.
Good Lining
While being held against
the cooling fins a
US Dime
slides
AGAINST
the outer
edge of the lining
retaining ring.
Worn Lining
–
Replacement Required
While being held against
the cooling fins a
US Dime
slides
UNDERNEATH
the
outer edge of the lining
retaining ring.
Application
First Check
Subsequent Checks
Line Haul
100,000 miles (160,960 km)
50,000 miles (80,465 km)
Severe Service*
50,000 miles (80,465 km)
25,000 miles (40.234 km)
*Severe service for trucks that average less than 8,000 miles/month (12,875 km/month)
