Hitman's Pontiac Trans Am Forum

Trans Am Information => Trans Am Tech => DriveTrain => Topic started by: spalku on September 06, 2009, 08:35:13 AM

Title: PCV Valve replacement on a 1978 Trans Am 400 cui
Post by: spalku 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

Title: Re: PCV Valve replacement on a 1978 Trans Am 400 cui
Post by: jphillips3333 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.

Title: Re: PCV Valve replacement on a 1978 Trans Am 400 cui
Post by: spalku 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?

Title: Re: PCV Valve replacement on a 1978 Trans Am 400 cui
Post by: spalku on September 07, 2009, 02:31:32 PM

tomorrow i will make some photos of the valve and post them here.

Title: Re: PCV Valve replacement on a 1978 Trans Am 400 cui
Post by: SavingTheBird76 on September 07, 2009, 05:24:40 PM

The larger end should go into the crankcase,while the smaller end goes to the carb.

Title: Re: PCV Valve replacement on a 1978 Trans Am 400 cui
Post by: Gallstaff 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!

Title: Re: PCV Valve replacement on a 1978 Trans Am 400 cui
Post by: spalku 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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Title: Re: PCV Valve replacement on a 1978 Trans Am 400 cui
Post by: spalku 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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Title: Re: PCV Valve replacement on a 1978 Trans Am 400 cui
Post by: brian c 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.

Title: Re: PCV Valve replacement on a 1978 Trans Am 400 cui
Post by: spalku 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

Title: Re: PCV Valve replacement on a 1978 Trans Am 400 cui
Post by: 78ta 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.

Title: Re: PCV Valve replacement on a 1978 Trans Am 400 cui
Post by: spalku 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

Title: Re: PCV Valve replacement on a 1978 Trans Am 400 cui
Post by: jphillips3333 on October 02, 2009, 04:18:43 PM

Cool - congrats Marko.  You owe us some pix of your ride...  ;)

Title: Re: PCV Valve replacement on a 1978 Trans Am 400 cui
Post by: spalku 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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Title: Re: PCV Valve replacement on a 1978 Trans Am 400 cui
Post by: spalku on October 03, 2009, 05:21:40 AM

Here`re another pics of my engine.

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Title: Re: PCV Valve replacement on a 1978 Trans Am 400 cui
Post by: jphillips3333 on October 04, 2009, 08:00:22 AM

Wow - that's a sweet looking '78 ... and only 22K and in Switzerland.  Cool.

Title: Re: PCV Valve replacement on a 1978 Trans Am 400 cui
Post by: brian c on October 04, 2009, 03:55:04 PM

Very sharp looking TA! Then again, I'm a little biased :)