Packard Forum Index » Pre-War (1899-1942)

You all have been a great help, and the beast is finally up and running. 2 last questions for now.
There is a hole in the air cleaner lid next to the one for the wing nut. Any ideas.
I added a factory oil filter set up. Now when warmed up so much oil goes down the fill/breather tube that is blows back up into the cap and is spilling out? I'm thinking it needs a restriciton somewhere?

On the air cleaner hole, if it is half inch or larger possibly someone tried to adapt a valve to form a PCV system. Others have done that by using a valve and length of hose connecting it to the road draft tube port on the valve cover. If smaller than a valve then no idea. Maybe a photo would let someone give a better answer.

On the original prewar type filters there should be a restriction in one of the fittings. Packard specified filling a fitting passage with solder then drilling a hole using a 5/64 drill bit thru the solder. On the prewar filters Packard placed the restricted fitting in the bottom inlet port elbow. You can go thru several of the prewar service letter articles having to do with noisy tappets and revised connections to get details although those were mostly pertaining to 356 engines. Excess flow thru filter would still be applicable to yours though. As I recall the one mentioning the specifics on the orifice was published in 43 and may be linked in an earlier reply.

Sorry. Thought I had attached a pic. It's a small hole. Smaller than the stud for the wing nut.

Attach file:

---

  20230921_154638.jpg (256.15 KB)

Fourbybud

You wrote “Now when warmed up so much oil goes down the fill/breather tube that is blows back up into the cap and is spilling out? I'm thinking it needs a restriciton [sic] somewhere?”

Unless the drain tube is very close to a baffle, the short answer is yes. HH56 added the recommendation is a 5/64” orifice. I would place the orifice between the engine and the filter housing, because that would dramatically reduce the pressure in the filter housing, thus reducing the possibility of a gasket leak. Plus if the orifice is right at the engine, again as HH56 noted as the preferred configuration, the entire accessory equipment could fall off and you still only have a 5/64” hole leaking oil . . . not that that is acceptable, but is surely better than a ¼” hole.

If you solder and drill an orifice you might start a bit smaller than the recommended size, and re-evaluate the splash-back in the filler tube. I have some experience in drilling leaded carburetor jets . . . my advice would be don’t push too hard, if you do it makes something more like rifling than a smooth bore. I don’t think in your application rifling would matter at all, but in a carb jet it has a tendency to alter the jet’s flow and exit pattern. I have a carb jet flow rig (water not gas) for volume flow measurements. The rifling would put a twist in the flow, and direct the water flow off to one side.

With respect to the hole in the air filter. I’m at a loss, but I do have a question. Would the hole allow debris, or liquid to be directed into the throat of the carb? If it does I would find a thin fender washer to put under the wing nut while we’re gathering more information. Perhaps there was a tab washer that had a dimple that fit somewhat into the hole and allowed an anti-rotation feature for the wing nut . . . but that’s a SWAG!

dp

I think there would have been a washer there that fits in there, perhaps with a rubber seal.

I'd wager someone drilled that hole to give the car a hotshot of starting fluid without removing the filter.

The hole leads directly into the carb. Looks like a factory hole, not drilled but who really knows. Gonna make a washer of some sort.
As far as the oil issue. Picked up a brass compression union this am and gonna fill with solder to drill out. 5/32 is not much less than the 1/4 line. Anyone want recommend a smaller size to start with?

Howard posted a 5/64 hole not a 5/32.

Quote:

Oops. My bad. Thank you

Well, made a restriction by using a brass compression. Filled it with solder and drilled it out to 5/64. Helped immensely but still have a slight splashing problem in the filler tube and saturating the breather to the point of leaking. What's everyone's thoughts on stepping down to 1/16 hole size? Or I was thinking about putting a brass freeze plug in the filler tube with some smaller holes to control the splashing yet still letting the engine breath?

Attach file:

---

  20230922_143009.jpg (0.00 KB)