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jenevers

4LW oil filter cap breather

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I haven't got one so I leave the cap slightly loose. But I noticed that air blows OUT from the crankcase so is the filter just to cut down oil mist in the engine room?

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Crankcase venting on LWs  is sometimes through the filler cap, where a vent filter is provided, or through venting in the rocker covers  If you haven't got either the crankcase pressure will build up for sure. If your engine is one of the many asthmatic Gardners out there the blow by can be considerable. Back in the day we drilled an tapped the covers on our 6LWs in the Fodens and ran hoses out behind the cabs to carry the fumes away from the drivers  Anything to avoid spending money on the trucks.

Edited by steamraiser2
typo

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On 18/07/2019 at 19:42, jenevers said:

As an experiment I'm going to put a white sock over the filler cap to see how dirty it gets.

Up to now the white sock is still clean. However I notice that there is a vapour emanating from the gap I leave by not screwing the cap tight.

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