Blow-By Gas Recirculation Filter; Crankcase Pressure Control Valve - Kohler SFGLD480 Operation & Maintenance Manual

2.4. Blow-by gas recirculation filter

This is the real conditioner of the blow-by gases before entry into the air
intake system. Externally, it looks like an upright black cylinder fitted with a
blow-by gas inlet pipe, one gas exhaust pipe and a drain for filtered
products at the bottom.
Its function is to completely eliminate gas-borne oil and condensates. For
this purpose, it includes a high-performance synthetic fibre filtering
cartridge. There are two filter models depending on the engine model, with
the HGM filter having the greatest filtering efficiency given the demands for
cleaning the turbochargers.
At the top, it has a red light indicator warning that the filter is plugged and
must be changed. In any case, the cartridge shall be changed at the
intervals specified in the maintenance guidelines. Refer to IO-C-M-25-
011e.
At the bottom of the system, there is a non-return valve which prevents
blow-by gas from flowing in a direction opposite draining.
The device has marks on the top showing the gas flow direction, by
pointing to the in and out ports of the filter.

2.5. Crankcase pressure control valve

This valve checks the balance between the amount of blow-by
gas sucked out of the crankcase into the air intake system and
the total quantity of blow-by gas produced in the engine.
For correct operation of the valve, it is necessary to measure
the pressure in the crankcase with the engine running at
nominal power and to set the valve to the specified rating.
When done, the valve need not be readjusted until the
cartridge is changed, since the crankcase pressure variations
provide important information on the system performance and
the internal wear of the engine. Tampering with the valve
would result in a loss of data and "deceiving" the system.
When changing the filter cartridge, check the valve. If found dirty or full of condensates, flush it with a water jet.
PRODUCT INFORMATION
IC-C-D-25-006e
DESCRIPTION OF A CRANKCASE GAS
RECIRCULATION SYSTEM
2.3.22
INDEX DATE
B
January 2015
O&M_2.002211.810_A_10_2016
FILTRO RECIRCULACION GASES CARTER
Cierres para cambio
de cartucho
Drenaje filtro
Dep. 2
Piloto saturación
4/5