1984/12/17 Caterpillar


Identification Of Camshaft Groups And Valve Mechanism Groups

Usage:


3208 Truck Engines (40S, 32Y, 2Z, 51Z),
Remanufactured 3208 Engines (62W)

The information that follows can be used as an aid to determine the correct camshaft and valve mechanism groups to use on 3208 Engines. This information does not replace the Parts Book, which provides correct part numbers for specific engine arrangements and serial numbers.

Three different camshaft and valve mechanism groups are available for use on 3208 Engines. See the chart.

All 3208 Direct Injected Naturally Aspirated (DINA) Engine arrangements use the 9N728 Camshaft Group and the 9N487 Valve Mechanism Group. The 9N728 shaft Group uses a "standard" lift cast iron camshaft. The 9N487 Valve Mechanism Group uses slipper followers and "standard" push rods. These engine arrangements use a single valve spring with each valve.

Some 3208 Direct Injection Turbocharged (DIT) Engine arrangements, up to and including 168 kW (225 hp), use the 9N6609 Camshaft Group and the 9N6617 Valve Mechanism Group. The 9N6609 Camshaft Group uses a "high lift" cast iron camshaft. The 9N6617 Valve Mechanism Group uses slipper followers and heavy duty push rods. These engine arrangements use a double valve spring set with each valve.

Other 3208 DIT Engine arrangements, rated above 168 kW (225 hp) use the 9N3596 Camshaft Group and the 9N3603 Valve Mechanism Group. The 9N3596 Camshaft Group uses a "high lift" steel camshaft. The camshaft lobes have a more rounded profile than the "high lift" cast iron camshaft. The 9N3603 Valve Mechanism Group uses roller followers and heavy duty push rods. These engine arrangements use a double valve spring set with each valve.

Caterpillar Information System:

1984/11/07 New Diaphragm Used In BrakeSaver Control Valve Group
1984/11/07 New High Alloy Material Is Used In Cylinder Head Assemblies
1984/11/07 Cetane Injection Group Uses New Orifice, Tee and Seals
1984/11/07 New Water Temperature Regulator Has Higher Temperature Setting
1984/11/07 Temperature Adapter Group Can Be Used With A Caterpillar Multimeter
1984/11/07 New Oil Filter Group Can Be Used To Extend Oil Change Interval
1984/11/07 New Cylinder Heads, Fuel Nozzles And Fuel Nozzle Adapters Used
1984/11/07 Remove Diode Assemblies From Shutoff Solenoids
1984/11/07 Foil Shield Will Help Prevent Electrical Interference In Engine Set Point Indicator
1984/09/26 New Cylinder Block Groups Used
1984/09/26 Higher Compression Pistons Can Help Reduce White Exhaust Smoke During Cold Weather Starts
1984/09/26 New Service Tools Available
1984/12/17 Remanufactured Cylinder Head Groups
1984/12/17 Causes And Correction Of Opposite Crankshaft Rotation In Direct Injection Engines
1984/12/17 Starters That Remain Engaged After Engine Is Running
1984/12/17 Thread Identification Kit Available
1984/12/17 New Pressure Gauges Have Dual Scales [kPa (psi)]
1984/12/17 Bonnet Of Fuel Injection Pump Group Now Serviced Separately
1984/12/17 Important Differences In Engine Arrangements On 3208 Engines Equipped With Turbochargers
1984/12/17 Remanufactured Turbocharger Groups
1985/01/01 Minimize Fuel Problems In Cold Weather Operation
1985/01/01 Governor Flyweight Shield No Longer Used In New Scroll Fuel Systems
1985/01/01 New Truck Battery Is Available
1985/01/01 New Rear Crankshaft Seal Has Longer Service Life
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