BENDIX TCH-001-032 用户手册
FACTORS INFLUENCING OIL PASSING
There are a number of application factors that can influence the oil passing rate of an air compressor, including:
* The inlet air supply.
* The effectiveness of the oil drain from the compressor.
* The coolant flow through the compressor.
* The effectiveness of the oil drain from the compressor.
* The coolant flow through the compressor.
Inlet Air Supply
Inlet air normally drawn from one of three locations:
1. Through the engine air cleaner - connected to the suction side of the turbocharger.
2. Through a compressor mounted air filter.
3. From the pressure side of the turbocharger.
2. Through a compressor mounted air filter.
3. From the pressure side of the turbocharger.
With methods 1 and 2, strict adherence to recommended filter maintenance schedules is necessary to avoid
introducing excessive restriction and / or inlet contamination, both of which will increase oil passing. Caution
must be exercised in converting a compressor to a turbocharged inlet to avoid causing other serious failure modes.
It is recommended that the vehicle manufacturer or compressor supplier be contacted for approval prior to
converting to turbocharged inlet.
introducing excessive restriction and / or inlet contamination, both of which will increase oil passing. Caution
must be exercised in converting a compressor to a turbocharged inlet to avoid causing other serious failure modes.
It is recommended that the vehicle manufacturer or compressor supplier be contacted for approval prior to
converting to turbocharged inlet.
Oil Drain From the Compressor
Restrictions present in the oil drain connection from the compressor to the engine can cause a build up of oil in
the compressor crankcase sump and increased oil passing. Recommendations for oil return lines are discussed on
the attached troubleshooting procedure. For flange mounted compressors which are internally drained back to the
engine, it is important that the drain ports are aligned and not restricted by gasketing or sealant used during the
compressor installation.
the compressor crankcase sump and increased oil passing. Recommendations for oil return lines are discussed on
the attached troubleshooting procedure. For flange mounted compressors which are internally drained back to the
engine, it is important that the drain ports are aligned and not restricted by gasketing or sealant used during the
compressor installation.
On flange mounted compressors, poor drainage may aggravate compressor oil passing. If this is prevalent,
it is recommended to bottom drain the compressor per step 2 of the “Oil Passing Troubleshooting
Procedure”. Bottom cover with drain port is available to convert the compressor.
it is recommended to bottom drain the compressor per step 2 of the “Oil Passing Troubleshooting
Procedure”. Bottom cover with drain port is available to convert the compressor.
Coolant Flow
Insufficient coolant flow can promote increased oil passing. Indicators of insufficient cooling include heavy
carbon deposits in the discharge line or fittings, carbonized oil deposits in the inlet cavity and discoloration of the
compressor cylinder head. Reference step 4 of the “Oil Passing Troubleshooting Procedure” for compressor
coolant flow requirements.
carbon deposits in the discharge line or fittings, carbonized oil deposits in the inlet cavity and discoloration of the
compressor cylinder head. Reference step 4 of the “Oil Passing Troubleshooting Procedure” for compressor
coolant flow requirements.
The attached procedure is intended to assist in determining the possible causes when excessive oil passing is
suspected and felt to be air compressor related. If the concern is still present after following this procedure,
consult your local dealer or distributor to determine the manufacturer’s representative in your region for
additional assistance.
suspected and felt to be air compressor related. If the concern is still present after following this procedure,
consult your local dealer or distributor to determine the manufacturer’s representative in your region for
additional assistance.
Oil Passing Troubleshooting Procedure
STEP 1: Restricted Air Intake
Check engine or compressor air cleaner and replace if necessary. Check compressor air inlet line for kinks,
excessive bends and be certain inlet lines have the minimum specified inside diameter. Recommended minimum
inlet line inside diameter is 5/8” (15.9mm). Recommended maximum air inlet restriction is 25” (6.2kPa) of water.
Check engine or compressor air cleaner and replace if necessary. Check compressor air inlet line for kinks,
excessive bends and be certain inlet lines have the minimum specified inside diameter. Recommended minimum
inlet line inside diameter is 5/8” (15.9mm). Recommended maximum air inlet restriction is 25” (6.2kPa) of water.