X/Flow Rocker Cover Elbow Fitting

[virden]

I wish to plumb the crankcase breather into the side of my cast alloy rocker cover, and assuming the thickness of the casting is too thin to tap into (?) I am seeking a rivet shaped fitting onto which to attach an elbow.  I have tried  plumber's merchants and aquarium suppliers but cannot find a fitting which has an inner face slim enough to avoid interfering with the bits that go up an down.   Somebody  must have solved this challenge?  Suggestions please.

[Tony P]

I have the breathing arrangement you describe (in one end, out to the catch tank from the other); the rocker cover was tapped (from memory; James Whiting did mine, but it was a long time ago...).

Alternatives are awkward: such as using what is, in effect, a bulkhead fitting (difficulties being finding one of appropriately modest depth, since such a thing would normally expect another hose fitted to the other end - and making damn sure that any locking nut cannot come loose, though you could modify the fitting) or welding a shallow nut around the hole on the inside (assuming you have access/ability to weld alloy - and a nut of the appropriate thread for your fitting). Or I suppose you could just weld the fitting on, perhaps?

Any other ideas, anyone?

[elie boone]

You can use one of these https://www.paulbparts.com/product/brass-threaded-nozzle-body-1-2-elbow/ and fix it with a half nut but be carefull there isn't much room between the valves from cil 2 & 3 and maybe it's possible you have to grind a little bit for clearance. 

[Roger King]

If the plumbing is done sensibly, the elbow is under no great strain. In this situation, most cast rocker covers are chunky enough to tap for a 3/8" BSPT thread which is what a lot of the available elbows have. Do fit it with one of Loctite's hydraulic sealants though.