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24 Valve Cummins Turbo Diesel Engine

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LOWER END

• There are a few changes to improve the ISB over the previous series of engines. Stiffening ribs are added to the block casting to reduce noise (Fig 4).
• Additional ports and bosses improve plumbing connections.  Straight O-ring metric fittings which provide better sealing are now used in all sensor taps and lube taps.
• A more efficient block heater (Fig 5) is located behind the oil cooler on the right side of the engine. The new heater features tapered pipe threads instead of the cup type heater used previously.
• Mounted on the crankshaft between cylinders 5 and 6 is a tone wheel  (Fig 6) which provides crankshaft speed and position data. The crank sensor is mounted behind the starter, which must be removed to service the sensor.

LUBRICATION SYSTEM
 

• A revised oil pump (Fig 7) has redesigned rotors for increased capacity. Excess engine oil is returned to the suction side of the oil pump instead of being returned to the oil pan, as was done in previous models. This improvement improves oil flow and  reduces pump cavitation at higher rpm.
• The oil fill point has been moved from the timing gear case to the cylinder head (Fig 8).  Be sure to use high-quality, multiviscosity oil that meets Cummins specifications.