1981/03/30 Caterpillar

6V3150 Engine Pressure Group Gives Direct Indication Of Manifold Pressure{0651,1058}

Usage:

Engine "boost" or manifold pressure is the difference in pressure between the air in the inlet manifold and the atmospheric pressure. The higher air pressure in the inlet manifold is caused by the turbocharger.

The new 6V3150 Engine Pressure Group is a replacement for the former 4S6553 Engine Evaluation Instrument group which is canceled. The former 4S6553 Engine Evaluation Instrument group gives indications in relation to "absolute" pressure. When the former group was used, the atmospheric pressure had to be subtracted from the gauge indication to get the manifold pressure.

The 6V3150 Engine Pressure Group gives a direct indication of the air pressure in the inlet manifold. This is possible because the two 6V4017 Pressure Gauges (-100 to 400 kPa, -15 to 60 psi) give indications in relation to the atmospheric pressure. This is the same type of indication (except for metric conversion) that is given in the Rack Setting Charts.

Illustration 1. The 6V3150 Engine Pressure Group.

Illustration 2. Face of the 6V4017 Pressure Gauge.

Caterpillar Information System:

1981/03/30 6V3197 Spacer, 6V3041 Tool Group Available For Use During Removal and Installation Of Piston Pin Bearings{0622,1219,1218,1214}

1981/03/30 Low Engine Temperatures: Install Check Valve{1353,1355,1370,1380}

1981/03/30 Check All Settings When Fuel Injection Pump Group Is Installed{1286,1264,1251,1253}

1981/03/23 New Tool Makes Glow Plug Wire Removal Easier {0622,0621,1403}

1981/03/23 Correction To Torque Specification For Locknuts On Valve Clearance Adjustment Screws Of Engines Equipped With Jacobs Engine Brakes {1119,1102}

1981/03/23 Longer Cable Assembly Now Used In The 9S2000 Flowmeter {0651}

1981/03/23 Fuel Pressure Relief Valve Is Shown Inverted (Wrong End Up) In Parts Book Illustrations {1253,1286}

1981/03/23 6V4009 Dowel Driver Available {0622,1101}

1981/03/23 6V2029 Fixture Group Available For Adjustment Of Air/Fuel Ratio Control {0626,1278,0652}

1981/03/16 New Shield Assemblies Used In Water Shielded Manifold Group{1067}

1981/03/16 New Inlet And Exhaust Valves And Valve Guides Have Tighter Fit To Prevent Corrosion And Guide Wear{1104,1105,1101,1103,1108,1109}

1981/03/16 5P1075 And 5P1076 Washers Have A Different Design{7553,0680}

1981/03/30 Electrical Information For EGR (Exhaust Gas Recirculation) Systems On 3208 Truck Engines So Equipped{1080}

1981/03/30 Brass Plug Now Used Instead Of Steel Plug In Sea Water Aftercooler{1063}

1981/04/06 Woodward Governor Available For Parallel Generator Applications{1289,1264}

1981/04/06 New Spacer And Plate Used In Transmission Lower Shaft Groups{3307}

1981/04/06 New Temperature Range Recommendation For Multi-Viscosity Oil In Power Shift Transmissions{3179,3155,3159}

1981/04/06 Use Heat-Indication Products To Measure Parts Temperatures{0651}

1981/04/06 Cooling System Cleaner Removes Rust And Corrosion{1350,1353,1354}

1981/04/06 Correct Refill Capacity For Engine Oil{1318}

1981/04/06 New Piston Ring Assemblies Give Improved Ring And Cylinder Liner Life{1215,1213}

1981/04/06 Improve Use Of Engine Service Manual Microfiche{0374}

1981/04/13 Use 6V4058 Universal Extension To Remove And Install Starter Bolts{0612}

1981/04/13 New 6V3060 EGR System Tester Group Available{1080}