Author Topic: PCV Valve replacement on a 1978 Trans Am 400 cui  (Read 1230 times)

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Offline spalku

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PCV Valve replacement on a 1978 Trans Am 400 cui
« on: September 06, 2009, 08:35:13 AM »
Hello!
I have one question to you.

Since May 2009 i`m a proud owner of a 1978 Trans Am 6.6 . It runs quite well!!! Now i want to do some maintainance. I must explain, that i haven`t done any maintainace on a car quite yet.  :-[

Now I want to change the PCV Valve but i don`t now how to put it into the right direction. I ordered a new one (its a Purolator  PV 679). One side of the rod inside the valve is signded with an "A". The old valve which is still in the car, has the "A"- side pointing to the carbuterator joined with a hose, but the valve doesn`t fit quite well in the grommet in the intake manifold.
Is this direction/ position right, or has the "A" side point to the intake manifold?
Thank you for a short answer!!!
Best regards from Germany!!!
Marko

Offline jphillips3333

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Re: PCV Valve replacement on a 1978 Trans Am 400 cui
« Reply #1 on: September 06, 2009, 09:22:15 AM »
Congrats on the purchase ... post some pix.

I want to say you can blow in it to check - it only goes one way.  Also, be careful of the grommet - they typically get real brittle with age.
John

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Offline spalku

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Re: PCV Valve replacement on a 1978 Trans Am 400 cui
« Reply #2 on: September 07, 2009, 02:27:28 PM »
Thank you very much- i know that the valve goes in only one way, but which ist the right way?
If the pressure comes from the intake manifold - should it open and blow the gases out into the carbuterator?

Offline spalku

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Re: PCV Valve replacement on a 1978 Trans Am 400 cui
« Reply #3 on: September 07, 2009, 02:31:32 PM »
tomorrow i will make some photos of the valve and post them here.

Offline SavingTheBird76

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Re: PCV Valve replacement on a 1978 Trans Am 400 cui
« Reply #4 on: September 07, 2009, 05:24:40 PM »
The larger end should go into the crankcase,while the smaller end goes to the carb.
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Offline Gallstaff

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Re: PCV Valve replacement on a 1978 Trans Am 400 cui
« Reply #5 on: September 07, 2009, 05:59:06 PM »
Thats right, the larger end goes into the valley pan while the smaller end connects to the manifold vac.

Be careful!  I broke the grommet off in the valley pan and had to remove my intake and pan to pry it out!  Don't let that happen, it's a pain!

Offline spalku

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Re: PCV Valve replacement on a 1978 Trans Am 400 cui
« Reply #6 on: September 08, 2009, 11:30:36 AM »
Hello!
First of all i want to thank you for your fast answers!!!
Now i made some photos to show you my "problem"  ;)
The first picture ist the old valve which does not fit correctly in the grommet. Now i think it was false installed the whole time.


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Offline spalku

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Re: PCV Valve replacement on a 1978 Trans Am 400 cui
« Reply #7 on: September 08, 2009, 11:33:02 AM »
The second picture is the new valve.
I signed the ends of the valve in which way i would mount the valve. i hope thats right.
Thank you!
Marko


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Offline brian c

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Re: PCV Valve replacement on a 1978 Trans Am 400 cui
« Reply #8 on: September 08, 2009, 12:02:52 PM »
Your second picture is labeled correctly. Definitely a press fit and the grommet in the valley pan does get brittle so be prepared to expand your vocabulary if it breaks into itty bitty pieces.

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Offline spalku

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Re: PCV Valve replacement on a 1978 Trans Am 400 cui
« Reply #9 on: September 09, 2009, 03:26:12 PM »
Thank you very much for your answer!!!!
I will change the valve on weekend- i hope it works and the grommet doesn`t break.
Best regards
Marko

Offline 78ta

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Re: PCV Valve replacement on a 1978 Trans Am 400 cui
« Reply #10 on: September 09, 2009, 04:44:40 PM »
Put some wd40 or engine oil on the grommet and pvc so that it will slide in easier. Maybe that will help to avoid breaking it.
Randy

Offline spalku

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Re: PCV Valve replacement on a 1978 Trans Am 400 cui
« Reply #11 on: September 29, 2009, 11:33:48 AM »
Everything was perfect!!!
The grommet didn`t break and it took only 15 minutes.
Thank you very much for your tips!
best regards

Offline jphillips3333

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Re: PCV Valve replacement on a 1978 Trans Am 400 cui
« Reply #12 on: October 02, 2009, 04:18:43 PM »
Cool - congrats Marko.  You owe us some pix of your ride...  ;)
John

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Offline spalku

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Re: PCV Valve replacement on a 1978 Trans Am 400 cui
« Reply #13 on: October 03, 2009, 05:20:09 AM »
OK!
Here they are... :)
It`s a car wich is in an absolutly original condition.
It has only 22.000 miles and comes from switzerland.
best regards!
Marko

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Offline spalku

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Re: PCV Valve replacement on a 1978 Trans Am 400 cui
« Reply #14 on: October 03, 2009, 05:21:40 AM »
Here`re another pics of my engine.

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