 74 2.0 vacuum hose question help! |
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| gtsilver16 |
 Sep 8 2018, 10:30 PM
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#1
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Newbie  Group: Members Posts: 12 Joined: 8-July 18 From: West Member No.: 22,299 Region Association: Northern California  |
Hi, I’m a new 914 owner, just bought a 74 2.0. I replaced the vacuum hoses with the AA hose kit. However, the hose coming from the anti flashback valve to the cyl 3/4 nipple on the head was missing. In fact, the nipple in the anti flashback valve was capped (see orange plug in attached pic). I want to install the missing hose but I cannot locate the nipple anywhere on the cyl 3/4 head. Can someone please show me where that nipple is located and maybe send a pic? Also, I’m wondering why it was capped at the anti flashback valve? Someone has suggested that maybe the 3/4 head was replaced with a 1.7 head which does not have a nipple. If this is the case, is it okay to keep it capped? Thanks everyone, I’m a 914 newbie and need help!!
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| TheCabinetmaker |
Sep 9 2018, 06:15 AM
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#2
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I drive my car everyday Group: Members Posts: 8,300 Joined: 8-May 03 From: Tulsa, Ok. Member No.: 666 |
They stopped using the vent tube on the heads in 75
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| gtsilver16 |
Sep 9 2018, 08:30 AM
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#3
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Newbie Group: Members Posts: 12 Joined: 8-July 18 From: West Member No.: 22,299 Region Association: Northern California |
Thanks Cabinetmaker, that’s helpful. If I can’t find the vent tube nipple on the 3/4 head, I’ll have to assume it’s been changed with a 75 head some time along the way.
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| TheCabinetmaker |
Sep 9 2018, 10:06 AM
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#4
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I drive my car everyday Group: Members Posts: 8,300 Joined: 8-May 03 From: Tulsa, Ok. Member No.: 666 |
That would be my guess. Some noted people here say not to run the head vents at all.
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| gtsilver16 |
Sep 9 2018, 10:40 AM
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#5
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Newbie Group: Members Posts: 12 Joined: 8-July 18 From: West Member No.: 22,299 Region Association: Northern California |
Thanks again, so it sounds like there’s no big risk in keeping the 3/4 release valve plugged and moving on? Any other input from the community appreciated thanks!
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| TheCabinetmaker |
Sep 9 2018, 11:00 AM
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#6
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I drive my car everyday Group: Members Posts: 8,300 Joined: 8-May 03 From: Tulsa, Ok. Member No.: 666 |
@HAMinc
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| JeffBowlsby |
Sep 9 2018, 03:06 PM
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#7
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914 Wiring Harnesses Group: Members Posts: 8,510 Joined: 7-January 03 From: San Ramon CA Member No.: 104 Region Association: None 
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The 1970-71 1.7L cars did not have this system including the head vents, either.
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| 914_teener |
Sep 9 2018, 03:18 PM
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#8
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914 Guru Group: Members Posts: 5,198 Joined: 31-August 08 From: So. Cal Member No.: 9,489 Region Association: Southern California |
My late 73 1.7 has it and it is the stock configuration.
I can post a pic if you are interested. I think it is very beneficial to oil draining back from the heads to the crankcase. My .02. |
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| gtsilver16 |
Sep 10 2018, 05:23 PM
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#9
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Newbie Group: Members Posts: 12 Joined: 8-July 18 From: West Member No.: 22,299 Region Association: Northern California |
QUOTE(914_teener @ Sep 9 2018, 04:18 PM)  My late 73 1.7 has it and it is the stock configuration. I can post a pic if you are interested. I think it is very beneficial to oil draining back from the heads to the crankcase. My .02. Thanks for the reply and information. I think I’m all set. Thanks! |
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| gtsilver16 |
Sep 10 2018, 05:23 PM
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#10
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Newbie Group: Members Posts: 12 Joined: 8-July 18 From: West Member No.: 22,299 Region Association: Northern California |
QUOTE(JeffBowlsby @ Sep 9 2018, 04:06 PM) The 1970-71 1.7L cars did not have this system including the head vents, either. Thanks Jeff! |
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