PCV valve

[138]

I want to fit a PCV valve to my 138 (she smokes a bit at idle through the road draft tube), and would like to know - The best location for the "return" line- I was thinking of drilling and tapping the spacer plate under the carby, and using a screw-in type PCV valve. Also, how is the road draft tube held in? It looks like a push fit, but I haven't yanked on it yet in case it has a retainer or nut on the inside of the side plate.

[Harv]

They are supposed to smoke, leak oil and smell slightly of unburnt fuel... it’s part of their charm

Don’t tap the carb spacer - the phenolic goes brittle. Remove the inlet manifold, drill and tap the side of the inlet manifold “box” that the carb sits above (if it does not already have a plug in it).

Some walking sticks slip off, others appear to be flared in place. You can’t see the other side of the stick as there is a baffle inside the side plate.

Cheers,
Harv

[gpi]

viewtopic.php?f=25&t=23171

[Blacky]

the draft tube should have a tang on the lower part that bolts on to one of the bolts that hold the sump on

[ardiesse]

I will heartily second what Harv said.
Perhaps I could suggest piston rings instead of a PCV setup

Rob

[138]

There is a fitting which feeds the vacuum advance on the distributor, how about a "T" fitting there? I don't have any other holes in the manifold, unless I get to it with the drill.

[ardiesse]

The vacuum advance port on the carburettor does not connect to manifold vacuum. It only produces vacuum off-idle and at light throttle openings. And the port drillings are tiny, so the flow rate will be next-to-nothing.

Are you using the standard inlet manifold? There should be a threaded plug on the side of the casting below the carburettor.

Also, PCV systems are designed to operate with new engines. They can't cope with the amount of blow-by produced by a worn engine. (Years of driving clagged red motors has taught me that.)

Rob

[138]

Your'e right, I didn't follow the line through properly, and the line I was looking at was the vacuum line for the wipers. I reckon a "T" there might work, the line is 1/4".

[ardiesse]

Just put the T-piece at the manifold. "Uphill" of the vacuum section of the fuel pump is not a good idea.

[Errol62]

Vacuum wipers and pcv
Damn rodders
8)8)8)


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[138]

You been snoopin' over my fence again!!!