 valve cover vents |
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| ruddyboys |
 Oct 13 2006, 06:57 AM
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#1
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Hummel eigentümer  Group: Members Posts: 594 Joined: 3-March 04 From: Monroe, NY Member No.: 1,749 Region Association: North East States  |
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.
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| 914Sixer |
Oct 13 2006, 07:10 AM
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#2
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914 Guru Group: Members Posts: 8,886 Joined: 17-January 05 From: San Angelo Texas Member No.: 3,457 Region Association: Southwest Region 
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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.
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| ruddyboys |
Oct 13 2006, 07:13 AM
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#3
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Hummel eigentümer Group: Members Posts: 594 Joined: 3-March 04 From: Monroe, NY Member No.: 1,749 Region Association: North East States |
My engine is an older '70 1.7 and there are no holes in the heads
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| SGB |
Oct 13 2006, 07:20 AM
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#4
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just visiting Group: Members Posts: 4,086 Joined: 8-March 03 From: Huntsville, AL Member No.: 404 Region Association: South East States |
yeah, I don't think a 70 would have the vents...
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| ruddyboys |
Oct 13 2006, 07:27 AM
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#5
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Hummel eigentümer Group: Members Posts: 594 Joined: 3-March 04 From: Monroe, NY Member No.: 1,749 Region Association: North East States |
could not having the vents cause pressure build up and make the push rod tubes leak?
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| URY914 |
Oct 13 2006, 08:00 AM
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#6
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I built the lightest 914 in the history of mankind. Group: Members Posts: 120,708 Joined: 3-February 03 From: Jacksonville, FL Member No.: 222 Region Association: None |
QUOTE(ruddyboys @ Oct 13 2006, 05:27 AM)  could not having the vents cause pressure build up and make the push rod tubes leak? Possible. |
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| SGB |
Oct 13 2006, 09:52 AM
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#7
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just visiting Group: Members Posts: 4,086 Joined: 8-March 03 From: Huntsville, AL Member No.: 404 Region Association: South East States |
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.
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| d7n7master |
Oct 13 2006, 10:01 AM
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#8
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Gary# Group: Members Posts: 663 Joined: 13-March 03 From: The O.C, Ca. Member No.: 421 |
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) 
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| Air_Cooled_Nut |
Oct 14 2006, 09:46 AM
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#9
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914 Ronin - 914 owner who lost his 914club.com Group: Members Posts: 1,748 Joined: 19-April 03 From: Beaverton, Oregon Member No.: 584 Region Association: None |
QUOTE(ruddyboys @ Oct 13 2006, 06:27 AM) could not having the vents cause pressure build up and make the push rod tubes leak? 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. |
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