Volvo / Ford Oil Separator Diaphragm, 52 mm - 1781598

The 52 mm membrane is a crankcase ventilation component in the specified Volvo oil filter housing and Ford oil separator applications. A worn ventilation membrane can disturb crankcase pressure, admit unmetered air and contribute to increased oil consumption.

Vehicle Applications

• Volvo C30 - 2006-2013.
• Volvo C70 - 2006-2013.
• Volvo S40 - 2004-2012.
• Volvo S80 - 2006-2016.
• Volvo V50 - 2004-2012.
• Volvo V70 - 2007-2013.
• Ford Focus II - 2005-2008.
• Ford Focus II - 2008-2011.
• Ford Kuga - 2008-2012.
• Ford Mondeo IV - 2007-2015.
• Ford S-MAX - 2006-2015.

Application Details

The Volvo application information specifies 2.0; 2.4; 2.5 V5 and engine designations B5254T, B5244S. The Ford information specifies 2.0L, 2.4L, 2.5L V5 and 2.5L Duratec-ST. Match the installed housing reference for the particular vehicle.

When to Check the Oil Separator Membrane

• Whistling or excessive crankcase vacuum.
• Unstable idle.
• Increased oil consumption.
• Oil deposits in the intake.
• Exhaust smoke after warm-up.
• Mixture faults caused by unmetered air.

Inspect the ventilation assembly to confirm the cause before replacing the membrane.

Assembly and Related References

30788494, 31338684, 31338685, 1781598, 30677920, 3911117978, 39 111 17 978.

Repair Scope

Replacing a failed membrane allows the ventilation component to be serviced without replacing a sound housing. Any oil-consumption improvement depends on the ventilation fault being the cause and the engine otherwise being serviceable.

Important Before Ordering

Compare the installed assembly reference, membrane design and dimensions before ordering. Check the housing and ventilation hoses for damage; a membrane alone may not resolve a cracked housing.

FAQ

What diameter is specified for this membrane?

The specified membrane diameter is 52 mm.

Which Ford applications are listed?

Focus II 2005-2008 and 2008-2011, Kuga 2008-2012, Mondeo IV 2007-2015 and S-MAX 2006-2015 are listed. Match the housing reference.

Which Volvo engine designations are mentioned?

B5254T and B5244S are mentioned in the Volvo application information.

Does membrane replacement require a complete new housing?

A failed membrane can be serviced separately when the housing is sound. Check the housing and ventilation hoses for cracks or other damage.

Part Number / PN

30788494, 31338684, 31338685, 1781598, 30677920, 3911117978, 39 111 17 978

SKU: KL30788494.

• Volvo
• Ford

Returns and exchanges

Request a change-of-mind return within 14 calendar days of delivery, then send the goods within 14 calendar days of notifying us. Our voluntary return option applies to unused, uninstalled, complete goods in their original condition and packaging. Exchanges are subject to availability and agreement.

The customer pays change-of-mind return shipping. No restocking fee applies. Refunds and original delivery charges are handled under our Refund & Return Policy and applicable law.

Faulty, damaged or incorrect goods

Email contact-us@klifex.net with your order details and a description of the problem. These claims are separate from change-of-mind returns. Where we are responsible, we bear the required remedy and return costs. Installation alone does not remove mandatory defect rights.

Your legal rights

Applicable statutory rights take precedence, including EU/EEA and UK withdrawal rights and legal guarantees. Necessary inspection does not remove a statutory withdrawal right; deductions for excessive handling must reflect an actual, evidenced loss of value.

Contact us for the correct return address before shipping. Our legal address is not a return address.

Read the full Refund & Return Policy