Printable Version of Topic

Posted by: ruddyboys Oct 13 2006, 06:57 AM

I read an article about a car smoking and they said does it have valve cover vents?? My cover look like the ones in the haynes manual and there are no vents. Can I see a pic of the vents and what would be the benefit.

Posted by: 914Sixer Oct 13 2006, 07:10 AM

The vents are in the cylinder head. One on each side on the top. They come together in a three way collecter by oil filler neck.

Posted by: ruddyboys Oct 13 2006, 07:13 AM

My engine is an older '70 1.7 and there are no holes in the heads

Posted by: SGB Oct 13 2006, 07:20 AM

yeah, I don't think a 70 would have the vents...

Posted by: ruddyboys Oct 13 2006, 07:27 AM

could not having the vents cause pressure build up and make the push rod tubes leak?

Posted by: URY914 Oct 13 2006, 08:00 AM

Possible.

Posted by: SGB Oct 13 2006, 09:52 AM

I agrree. As rings go, the crankcase starts becomming pressurized, which would seek relief at PR tube seals, valve covers, and temp sensor, at least.

Posted by: d7n7master Oct 13 2006, 10:01 AM

Mine weren't vented either. Both heads had blank boss's.
Took a trip to the local flaps for a d/bit. tap & vent tubes.




Attached image(s)

Posted by: Air_Cooled_Nut Oct 14 2006, 09:46 AM

According to my FI book (Henry Elfrink tech manual), those "vents" are used as part of the crankcase ventilation system. Air travels FROM the air cleaner INTO the engine case. Excess pressure is vented FROM the oil breather TO the intake air distributor. Same concept is used on the air-cooled VW engines.

I recommend checking the breather and path to the air distributor (plenum). Maybe something's plugged or restricted.