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Posted by: gtsilver16 Sep 8 2018, 10:30 PM

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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Posted by: TheCabinetmaker Sep 9 2018, 06:15 AM

They stopped using the vent tube on the heads in 75

Posted by: gtsilver16 Sep 9 2018, 08:30 AM

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.

Posted by: TheCabinetmaker Sep 9 2018, 10:06 AM

That would be my guess. Some noted people here say not to run the head vents at all.

Posted by: gtsilver16 Sep 9 2018, 10:40 AM

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!

Posted by: TheCabinetmaker Sep 9 2018, 11:00 AM

@HAMinc

Posted by: JeffBowlsby Sep 9 2018, 03:06 PM

The 1970-71 1.7L cars did not have this system including the head vents, either.

Posted by: 914_teener Sep 9 2018, 03:18 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.

Posted by: gtsilver16 Sep 10 2018, 05:23 PM

QUOTE(914_teener @ Sep 9 2018, 04:18 PM)

Posted by: gtsilver16 Sep 10 2018, 05:23 PM

QUOTE(JeffBowlsby @ Sep 9 2018, 04:06 PM)