Air cleaner decals

[Lynn Eades]

Mike I have a united specialties breather that has two tags one from Ford of Canada and the other with a Ford part number. I assume United Specialties was a subsidiary of Ford? I don't know that these were supplied as a carrier part, but assume they were used "across the board" where an oil bath breather was specified. Nigel Watson's book talks about the alarmingly short engine life of Carrier engines in the desert and assume the oil baths were adopted then?
My Canadian Commercial parts book specifies "C11AS 6766 D Cap - oil bath breather assy (when Hydro vent specified) "Push in type". Fitted from 3/41. There was also a screw in type.

[Lynn Eades]

Sorry about the pictures. I don't know how to rotate them. Ron , you have the hydro vent, so in theory at least you should be running an oil bath breather.

[Ron Pier]

"Hydro vent" Is that what my standard oil filler cap is called Lynn? If one of the oil bath filters comes along I'll fit it, Ron

[Hanno Spoelstra]

Originally Posted by Lynn Eades

Mike I have a united specialties breather that has two tags one from Ford of Canada and the other with a Ford part number. I assume United Specialties was a subsidiary of Ford? I don't know that these were supplied as a carrier part, but assume they were used "across the board" where an oil bath breather was specified. Nigel Watson's book talks about the alarmingly short engine life of Carrier engines in the desert and assume the oil baths were adopted then?
My Canadian Commercial parts book specifies "C11AS 6766 D Cap - oil bath breather assy (when Hydro vent specified) "Push in type". Fitted from 3/41. There was also a screw in type.

Lynn, Tony answered most of your questions here: http://www.mapleleafup.net/forums/sh...688#post123688

[Lynn Eades]

Ron, the pre 42 engine had a crankcase breather system where air was drawn in via the oil filler cap (as per your engine filler cap) This was drawn in because the sump had a vent at the r.h. front of the sump, that was affected by the air flow past it (in the draught under the engine in a car or truck) (In other makes, called a draught tube) In your engine there is no vent. However your engine has the hydrovent system which has a thin sandwich plate between the carb base and the valve cover (inlet manifold) This has connected to it by way of various fittings, a PCV valve which is in turn connected to a tapping at the front right side of the inlet manifold (under the generator). In this system a negative flow is drawn in via the oil bath oil filler. This negative pressure is generated from engine vacuum (under closed throttle) and in turn draws throught the PCV valve (I see it, in your engine photo) and in turn through the pipe running forward to the front of the manifold. The early system doesn't work in a carrier with no draught past the sump vent. I hope this all make sense?

[Ron Pier]

Thanks for the concise explanation Lynn. I'll take a closer look next time I get the covers off. I'd like to find one of those filters some time.

Cheers Ron