1984/12/12 Caterpillar


Identification Of Camshaft Groups And Valve Mechanism Groups

Usage:


3208 Industrial Engines (90N, 3Z),
3208 Marine Engines (75V, 1Z),
3208 Generator Set Engines (29A, 30A),
Remanufactured 3208 Engines (62W, 93Z)

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 Camshaft 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:

1984/12/12 Preferred Engine Timing Procedures
1984/12/12 Addition Of Lubricator Will Help Prevent Corrosion In Air Prelube Motors
1984/12/12 Additional Clamp Reduces Vibration Of Turbocharger Oil Supply Line
1984/12/12 New 76.6°C (170°F) Water Temperature Regulators Used In Inlet Controlled Cooling Systems
1984/12/12 Starters That Remain Engaged After Engine Is Running
1984/12/12 Thread Identification Kit Available
1984/12/12 Remanufactured Turbocharger Groups
1984/12/12 Improved Turbocharger Oil Drain Elbows
1984/12/12 A Soot Filter Is Available For Use With Air Cleaners
1984/12/12 New Pressure Gauges Have Dual Scales [kPa (psi)]
1984/12/12 Causes And Correction Of Opposite Crankshaft Rotation In Direct Injection Engines
1984/12/12 Additional Information For Correct Fuel Injector Timing
1984/12/12 New Seal Used In Alternator Mounting Group
1984/12/12 Rear Power Take-Off Clutch Can use Nonmetallic Plates And Grease Lubrication For Main Bearings
1984/12/12 Important Differences In Engine Arrangements On 3208 Engines Equipped With Turbochargers
1984/12/12 Remanufactured Cylinder Head Groups
1984/12/12 Use Care When Installing Circuit Boards In Regulators
1984/12/12 New Fuel Injector Assembly Reduces Smoke When Operating At Lower RPM And Load
1984/12/12 Bonnet Of Fuel Injection Pump Group Now Serviced Separately
1985/01/16 Install Different Body Assembly In Clutch Group To Correct Harsh Shifting
1985/01/16 Improved Valve Mechanism Cover Group Has A New Valve Cover And Seal
1985/01/16 Valve Lash Adjustment Not A Warranty Item
1985/01/16 Additions To Reference Chart For Major Production Changes
1985/01/16 Remanufactured Air Fuel Ratio Controls (U.S. And Canada)
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