Volvo Oil Filter Housing - Genuine Volvo 31338685, 30788494, 31338684, 31338685

Volvo Oil Filter Housing

Typically referred to as the Crankcase Breather Box for the P1 and P3 platform 5 cylinder model vehicles: C30 C70 S40 V50 S60 V60. Commonly replaced due to a separation or tear in the vacuum diaphragm which causes a high pitched whistle at idle. This oil filter housing includes oil filter, oil filter cap, oil filter o-ring and seal to engine block.

The dipstick mounting bracket and two cable brackets attach via bolt holes that are not threaded on this new housing. Because the hardware is steel, it will self tap into the new aluminum housing.

What causes my breather system to fail?

• Wrong oil grade, quality and/or viscosity
• Vehicles driven too many miles between oil changes
• Vehicles frequently driven short distances with many cold starts
• Excessive idling
• Fuels of low quality or with high alcohol content
• Additives added to oil or fuel
• High ambient temperature
• High air humidity

What are some of the symptom’s I can expect if my breather system is clogged?

• Illuminated oil pressure lamp. – Due to clogged oil suction strainer to oil pump or oil filter
• Illuminated Check Engine Lamp- Due to incorrect engine fuel trim level parameters
• Noise (whistling) – Noise due to high pressure in crankcase. This noise will stop if the oil filler cap is removed.
• Poor Drivability- Clogged crankcase ventilation can reduce the engine performance
• Uneven / Oscillating Idling- Caused by clogged crankcase ventilation
• Oil leak- From engine seals due to restricted crankcase ventilation
• Noise (knocking)- Low oil pressure can cause premature bearing wear and lead to internal engine component failure
• High oil consumption/noise from Turbo
• A damaged bearing or seal in the turbo due to lack of oil as a result of oil consumption.

What can I do to check for it?

• The first step is to inspect the oil filter to see if it is abnormally dirty. An abnormally dirty filter is easily recognized by its thick, black deposits
• If the engine has a problem with carbon deposits, the passageways in the engine block and oil trap may be completely or partially clogged. Remove and check the oil trap, hoses and their passageways in the engine block. There should not be any major collections of carbon deposits in the hoses or in the passageways in the block.
• Drain the engine oil. Remove the oil pan and check the oil pan and crankcase for deposits. Normally, there should not be any deposits. Also check the oil suction strainer on the oil suction line for contaminants and deposits.
• Use a low caliber Vacuum gauge to check for positive pressure through the dipstick tube