Oil filters can be designed as:
Spin-on Filter ( Metal Oil filter) which is replaced completely after its useful life;
Cartridge-Filter ( Metal Free) only the cartridge needs to be replaced because housing is fixed into engine.
FUNCTION
Their objective is to prevent the premature wear and breakage of the engine components :
- retaining any particle or impurity suspended in the oil (as dust, abraded metal, carbon deposits, soot particles, etc.) of a diameter which is superior to the lubricating film thickness
- eliminating the resulting product from the combustion which goes into the oil sump
- cooling : absorb and transport heat from engine
- sealing : the rings between liner and piston, etc
WHEN SHOULD THE OIL FILTER BE REPLACED
Following the vehicle manufacturer recommendation; however Muller Filter advises to replace oil filter every oil change or at least once per year.
DELAYED OR MISSED REPLACEMENT CAUSES
- breakage of engine
- wear of the engine components
- noise of mechanical components and combustion process
HOW DOES IT WORK?
The oil present in the carter is aspirated from the pump and once purified by oil filter arrives to all engine components that need lubrication.
There are different types of oil filters:
Full-flow filters
By-pass filters
Full-flow/ By-pass filters (combination)
Full-flow filters
All the oil, aspired by the pump, pass through the filter before going to the places that need lubrication.
The oil pump incorporate an overpressure valve that limits the oil pressure between 3 to 5 kg/cm2.
If the pressure exceed this limit the gaskets are pressed out of their sittings or the oil filter is blown out of its sitting and oil starts leaking out..
A by-pass valve is mounted to prevent a too high pressure difference between the clean and dirty side the of the filter element.
This valve opens at a pressure difference from 0,5 to 3 Bar so the oil can still lubricate the engine. An additional anti-drain valve prevents the filter to drain oil to the carter when the engine is stopped. Some filters are provided with an anti-siphon pipe to avoid oil siphoning out of the filter when the engine is stopped.
By-pass aspirated/ combination filters
The oil aspired from the carter is pumped directly to the engine components that need lubrication. In another line, where the by-pass filter is putted in, about 10% of the main oil flow passed to be filtered.
The main oil flow (about 90%) goes unfiltered to the engine, but the efficiency of the by-pass filter is however very high because the same oil is repeatedly passing the filter element, permitting to by-pass system to catch all particles ( multi-pass oil filter).
FILTERING MEDIA
100% of the oil filters are manufactured with cellulose filtering media. Faithfully following the vehicle manufacturer specifications , Muller Filter uses several different types of filtering media for the manufacturing of its oil filters.
Pressure drop and filter-life (dust loading capacity) are designed according to OE requirements.
The most relevant technical specifications of filtering media:
Technical Specifications Minimum Maximum
Grammage (grs./m²); 80 320
Maximum Pore (µ) 18 60
Micron Rating 90% (µ) 2 20
MULLER FILTER proposes a wide range of filters for the automotive industry, machines and engines, updated with continuous program extension.
Our product line consists in over 1400 types of Fuel , Oil , Air, Cabin Air filters covering about 95 percent of European and Asiatic passenger car and light commercial vehicles applications.
What makes in a Muller filter an elevated performance products of guaranteed quality :
- continuous R & D investments;
- modern production machinery;
- quality control systems according to the international ISO requirements;
- a professional staff with long time experience;
- partners homologated from OE manufacturers;
- a quality policy aimed at environmental protection according to ISO 14001.
MULLER FILTER
