SHIM 3Y0227 - Caterpillar

Table 2
Cold Weather Operation For Caterpillar
Medium Duty Truck Engines Without Catalytic Converters    
Idle Temperature And Coolant Warm-up Improvements    
Expected
Coldest
Temperature     Hand
Throttle     Shutters     Low Speed
Viscous
Fan Clutch     Exhaust
Restrictor (1)
or Brake    
Above
−7 °C (20 °F)     Available     Available     Available     Available    
−7 °C (20 °F) to
−18 °C (0 °F)     Available     Recom'd (2)     Recom'd (2)     Available    
−18 °C (0 °F) to
−28 °C (−18 °F)     Recom'd     Required (2)     Required (2)     Recom'd    
−28 °C (−18 °F) to
−40 °C (−40 °F)     Required     Required     Required     Recom'd    
Below
−40 °C (−40 °F) (3)     Required     Required     Required     Required    
( 1 ) Not available from factory. (see Caterpillar Dealer or Pacific Brake/Jacobs Dealer.)
( 2 ) Either shutters or low speed viscous fan clutch.
( 3 ) Consult Factory.
Table 3
Cold Weather Operation Recommendation For Caterpillar
Medium Duty Truck Engines In Bus Applications
And Truck Engines With Catalytic Converters    
Idle Temperature And Coolant Warm-up Improvements    
Expected
Coldest
Temperature     Hand
Throttle (1)     Shutters (2)     Low Speed
Viscous
Fan
Clutch (3)     Exhaust
Restrictor (4)or Brake    
Above
−7 °C (20 °F)     Available     Available     Available     Available    
−7 °C (20 °F) to
−18 °C (0 °F)     Required     Recom'd (5)     Required (5)     Recom'd    
−18 °C (0 °F) to
−28 °C (−20 °F)     Required     Required (5)     Required (5)     Recom'd    
−28 °C (−20 °F) to
−40 °C (−40 °F)     Required     Required     Required     Required    
Below
−40 °C (−40 °F)     Required     Required     Required     Required    
( 1 ) General Motors Option Code for Hand Throttle-KQY.
( 2 ) General Motors Option Code for Shutters-RPO VO4.
( 3 ) General Motors Option Code for Low Speed Viscous Fan Clutch-RPO KUW.
( 4 ) Exhaust Brake and Restrictor are not available from General Motors.
( 5 ) Either shutter or low speed viscous fan clutch.