Testing and Adjusting - air systeme

Testing and Adjusting
3064 and 3066 Engines for Caterpillar Built Machines

Air Inlet and Exhaust System - Inspect


There will be a reduction in the horsepower and in the efficiency of the engine if there is a restriction in the air inlet system or in the exhaust system.

Note: A restriction is a negative pressure difference measurement between the atmosphere and the air that has gone through the air cleaner.

The air flow through a used air cleaner element or through a plugged air cleaner element must not have a restriction of more than the following amount: 7.5 kPa (30 inch of water)

The air flow through a new air cleaner element must not have a restriction of more than the following amount: 3.7 kPa (15 inch of water)

Note: Back pressure of the exhaust is the pressure difference that is measured between the pipe at the end of the turbocharger discharge and the atmosphere.

The back pressure from the exhaust must not be more than the following amount: 10.0 kPa (40 inch of water) 4

Turbocharger - Inspect

SMCS - 1052-040

Check the turbocharger under the following conditions:

    Every 7200 hours of usage
    Any unusual noises from the turbocharger
    Any unusual vibrations in the turbocharger

A quick check of a turbocharger bearing's condition can be made without the disassembly of the turbocharger. Follow this procedure for this quick check:

    Remove the piping from the turbocharger.

    Inspect the following components:
        Turbocharger compressor wheel
        Turbocharger turbine wheel
        Compressor cover

    Rotate the assembly of the turbocharger compressor wheel and the turbocharger turbine wheel by hand. Take extra care to feel for any excess end play and for radial clearance.The assembly of the turbocharger compressor wheel and the turbocharger turbine wheel should rotate freely without any rubbing and without any binding.
    If the turbocharger turbine wheel rubs against the compressor cover or the turbine wheel rubs against the turbine housing, the turbocharger needs replacement or repair. For replacement, use a turbocharger that is new, reconditioned, or rebuilt.

    Inlet Manifold Pressure - Test
 
    SMCS - 1058-081
    Inlet Manifold Pressure
    Normal inlet manifold pressure with high exhaust temperature can be caused by blockage in the fins of the aftercooler core assembly. Clean the fins of the aftercooler core assembly.
    Low inlet manifold pressure and high exhaust manifold temperature can be caused by any of the following conditions:
    Plugged air cleaner - Clean the air cleaner, as required. Replace the air cleaner, as required.
    Blockage in the air lines - Blockage in the air lines between the air cleaner and the turbocharger must be removed.
    Aftercooler core leakage - A leak in the aftercooler core should be repaired.
    Leakage of the induction system - Any leakage from the pressure side of the induction system should be repaired.
    Inlet manifold leak - An inlet manifold leak can be caused by any one of the following problems:
    Loose fittings and loose plugs
    Missing fittings and missing plugs
    Damaged fittings and damaged plugs
    The inlet manifold to cylinder head gaskets

Check all of these items, if necessary.