1985/04/08 Caterpillar

Changes To Naturally Aspirated Truck Engines For 1985{1000,1200,1214,1218,1250,1251,1254}

Usage:

3208 Truck Engines ( 51Z)

The basic engine arrangements for the 3208 Truck Engines (51Z) have been changed for 1985. The changes were made so the engines would meet emission requirements for 1985. These changes include a new fuel injection nozzle assembly, piston and rod groups and the fuel pump drive groups on some engines.

The new 7W3710 Nozzle Assembly is used in these engines for 1985. A new 9L9099 Seal is used with the new 7W3710 Nozzle Assembly. The new 9L9099 Seal is black in color.

Some engine arrangements have rod and piston groups that give higher compression ratios. These engines are shown in Chart A.

These engines for 1985 use two fuel injection pump and governor drive groups. Both drive groups have an automatic timing advance unit. The drive groups and degrees of advance are shown in Chart B.

The model year of the engine is listed on the emission decal on the valve cover. The engine or engine parts should not be modified in any way. Parts for 1984 and earlier engines are still available.

Caterpillar Information System:

1985/04/08 Crankcase Explosion Relief Valve Kit Available{1200,1233}

1985/04/08 New Outer Governor Spring And Torque Control Pin Used In Governor And Pump Groups{1264}

1985/04/08 Additional Zinc Rods Improve Service Life Of Sea Water Heat Exchanger{1379}

1985/04/08 Several Types Of Automatic Voltage Regulators (AVR) Used In SR4 Generators{4450}

1985/04/08 Differential Oil Pressure Gauge For Oil Filter Shows High Differential Pressure{1300,1306,1315}

1985/04/08 Electric Hour Meter Failures{7450,7478}

1985/04/08 Preferred Locations For Water Temperature Protection Devices{7403,7417,7420}

1985/04/08 Changes To Exhaust Manifolds Help Prevent Broken Studs{1059}

1985/04/01 More Tools Added To 6V9413 Custom Track Service Tool Kit{0600}

1985/04/01 New Turbocharger Oil Supply Tube Assembly Used{1052,1307}

1985/04/01 New Lubricator Tip Available For Track Seal And Lubrication Testing Group{0600,0645}

1985/04/01 Check Cylinder Block And Head Flatness Whenever There Is A Head Gasket Failure{1100,1200}

1985/04/08 Hardened Spacers Help Keep Bolts Tight{1063}

1985/04/08 Make Sure Air Cylinder For Governor Actuation Is Correctly Adjusted{1269}

1985/04/08 Track Group Shipping Clamps Are Available Through The Parts Distribution System{4170}

1985/04/08 Constant Torque Hose Clamps Available For General Use{7550,7553}

1985/04/22 New Camshafts Used In SAE Standard [CCW] Rotation Engines{1200,1210}

1985/04/22 Correct Installation Of Oil Sequence Valves{1304}

1985/04/22 FT1953 Gauge For Track Assembly{0600,0760}

1985/04/22 New Ring (Seal) Used In Clutch Piston{3354}

1985/04/29 Installing New Copper Bonded Bearings Can Extend Engine Life{1230,1203,1219}

1985/04/29 Extended Oil And Oil Filter Change Intervals{1300,1318}

1985/04/29 Special Pricing On Metric Hand Tools For U.S. And Canada Only{0600,0601,0602}

1985/04/29 Visual Inspection Can Detect Chrome Plated Engine Valves{1105}