[98IntrepidTan]

In a 2004 Police (3.5 HO) what seals the Secondary Runner valve shaft to the manifold? I don't see anything and wonder if the seal is:
1) sucked into the intake
2) otherwise just missing
3) non-existent

I seem to have a leak in this area.

 

[peva]

(short runner valve)

I don't know the answer to your question, but are you sure it's the SRV that's leaking, and not the MTV actuator? Not saying you're wrong, but just suggesting the MTV actuator o-ring (between the back of the actuator and the plenum), which is a common leak point - when it leaks (more like slow seepage), that area and down the front of the engine gets an oil film all over - might see some dripping, but mostly a film.

SRV shaft - green circle
MTV actuator - red circle

 

[Daytrepper]

Its a bushing with an integrated seal; they were not available separately from the plenum.

A tech told me once the plenum needed to have "a bit of oil" circulating thru it to coat that shaft and assist in sealing the shaft, but the only important point was at the front really.

 

[98IntrepidTan]

Thanks for the replies.

The attendant actuator is called "ACTUATOR KIT, Secondary Runner Valve" in the parts manual. I've also since found a reference to "Short Runner Valve" in the service manual. So it could be either (or both!) The valve is for the runner that is both short AND secondary.

And yes, this (the green circle) is where the leak is. I slightly pressurized the intake and felt the air escaping. I may have blown out the accumulated dust and debris that was sealing it.

I think I'll see if I can source an o-ring with the same ID as the shaft, lube it up with wheel bearing grease and slide that on to help seal the shaft. No unfiltered air in the manifold!

 

[peva]

Thanks for the replies.

The attendant actuator is called "ACTUATOR KIT, Secondary Runner Valve" in the parts manual. I've also since found a reference to "Short Runner Valve" in the service manual. So it could be either (or both!) The valve is for the runner that is both short AND secondary.

And yes, this (the green circle) is where the leak is. I slightly pressurized the intake and felt the air escaping. I may have blown out the accumulated dust and debris that was sealing it.

I think I'll see if I can source an o-ring with the same ID as the shaft, lube it up with wheel bearing grease and slide that on to help seal the shaft. No unfiltered air in the manifold!

I hadn't noticed the "secondary runner" in the parts pdf. 👍

Shoving an o-ring that fits snuggly on the shaft up against the plenum with some grease as you suggest might work. I wonder if you could clean the plenum surface off real well and glue the o-ring to it with some modified cyanoacrylate like below. Probably overthinking it. 🤪 Simpler (just o-ring and grease) might be good enough and not need attention too often.

In stock at the big box and hardware stores, naybe even Walmart.

Super Glue ULTRA Gel Control from Loctite Adhesives

Super-tough, durable bonds that resist weather, impact, shock and vibration.

www.loctiteproducts.com

 

[Daytrepper]

Something like this may work as well. Its basically gasket maker that never hardens. Its too thick to get sucked in, especially in such a small area. Would last longer than grease. This is something generally used where you need a super flexible seal. Maybe this +O-ring would be pretty permanent. The SRV valve doesnt operate constantly so it wouldnt be torn up.