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post #1 of 17 (permalink) Old 11-13-04, 09:34 PM Thread Starter
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Emmission control systems

Positive crankcase ventilation (pvc) system

I was just wondering if i need this system on my xa 351c im sure it was 1977 onwards.

I also need to no if i can just plug up the holes in the manifold and fit those small air filters to the rocker covers?

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post #2 of 17 (permalink) Old 11-13-04, 09:40 PM
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Re: Emmission control systems

do you want to remove this because of looks?
are you wondering about emission laws, or the effect this will have on your XA?

IMO, i would leave the pvc there to do its job, releases pressure from your crank case is about all i know though....
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post #3 of 17 (permalink) Old 11-13-04, 09:54 PM Thread Starter
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Re: Emmission control systems

Ive got them there but they arnt connected up.
Nah dont realy care about the looks ill go get some pics later today
How did pre 1977 cars vent there crankscases or am i spose to have them fitted?
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post #4 of 17 (permalink) Old 11-13-04, 10:31 PM
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Re: Emmission control systems

PCV valves were fitted factory from about XP/XR onwards. They are there to collect all the piston blowby, that without the PCV valve connection ends up in the engine oil, reducing oil life. I would always run a PCV valve.
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post #5 of 17 (permalink) Old 11-14-04, 12:04 AM Thread Starter
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Re: Emmission control systems

So the oil it gets thicker and it ends up in the sump when its not connected?

Could this be why my rear main keeps leaking?
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post #6 of 17 (permalink) Old 11-14-04, 12:54 AM Thread Starter
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Re: Emmission control systems

ok ive got a few pics now one is on top of the radiator hose connection it has 3 nipples

the other one is on the manifold behind the distributor it has 2 nipples but 1 snapped of in not sure if this one is ment to have 3?

What type of hose do i use and where does each bit go?
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post #7 of 17 (permalink) Old 11-14-04, 01:05 AM
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Re: Emmission control systems

The system is designed to alter the timing between normal and potential overheat conditions. Instead of running vacuum straight to distributor it goes through setup.
If you wish to run setup as per factory you will have to consult factory manual. Generally many cars have had the lines removed and are running setup as XB or before.
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post #8 of 17 (permalink) Old 11-14-04, 01:23 AM
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Re: Emmission control systems

Quote:
Originally Posted by benXaGt
So the oil it gets thicker and it ends up in the sump when its not connected?

Could this be why my rear main keeps leaking?
The oil actually gets thinner because it is diluted with fuel. PCV enables less frequent oil changes. (Oil filter was an accessory on early Holdens, which helps also.) They just had a vent on top of the rocker cover to let fresh air in before PCV.
I can scan the manual and email it if you like.

1978 XC Fairmont GXL, Emerald green, Jade Int. 351C, 750 VAC, C10, 9" LSD
Air, steer, power windows................
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post #9 of 17 (permalink) Old 11-14-04, 01:35 AM
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Re: Emmission control systems

that water neck is off an xc or later. xa's never had these as they didn't have to comply with adr27a. i doubt this is the original motor.
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post #10 of 17 (permalink) Old 11-14-04, 02:01 AM Thread Starter
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Re: Emmission control systems

i know its a transplant v8 from a xb
mines a xa that used to be a 6 then i got it converted to a 8
i dont no why the mechanic put it on cause its a pre 1977 engine so it does not need the emmission gear on it

If this is on the radiator hose why doesnt it have coolant squiting out of it?
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