Model A oil blow by from oil filler tube cap
 

Howdy all! Had an oil blow by issue out of the oil filler tube cap of my 1928 open cab pick up. Saw some discussions on here and none of the solutions posited seemed to actually stop the issue, just redirected it to somewhere under the car. I found an inexpensive solution that actually keeps the oil in the tube. I bought a 64-72 Chevy flame arrestor online. If you invert the arrestor and place it in the tube, it catches all the blow by droplets and they drain back into the oil tube instead of coming out of the cap and onto your engine or water hose. The part is under $10 and works. See pic of fitment. Hope this solution helps you too…

Re: Model A oil blow by from oil filler tube cap
 

Re: Model A oil blow by from oil filler tube cap
 

Yup, that’s the one…

Re: Model A oil blow by from oil filler tube cap
 

I have read, but never experienced, that restricting crankcase ventilation (blow by) can result in oil leakage past the rear crankshaft seal. An old trick was to stuff steel wool into the breather tube. So, if I were to do something like this I'd be sure to keep it relatively clean.

Re: Model A oil blow by from oil filler tube cap
 

I was just going to suggest the same thing.

Re: Model A oil blow by from oil filler tube cap
 

If the oil level is too high more oil will be spewed out.
The owners instruction book says to fill up to the “F” I take that to mean it should be below the F not covering it.
I overfilled my smiths compressor and got to watch it spew oil rapidly until it got below the F

Re: Model A oil blow by from oil filler tube cap
 

Look on it as free rustproofing. :)

Re: Model A oil blow by from oil filler tube cap
 

Flame arrester for 64 - 72 Chey Pick up trucks...Those are the trucks that have the gas tank inside the cab. Maybe an arrester was a good idea.... Like a Model A

Joe B

Re: Model A oil blow by from oil filler tube cap
 

It says four have sold in the last 24 hours. Must be some nervous Chevy owners.
Could be good business selling to smokers.

Re: Model A oil blow by from oil filler tube cap
 

Looks like a cheaper solution than the NOS oil cap baffle that I found. It does work though.

Re: Model A oil blow by from oil filler tube cap
 

The suggested steel wool trick suggested would be of concern as fragments could be dislodged and enter the oil pan. Instead of steel wool I have used the stainless steel pot scrubby pads, much courser and sturdy, rust proof and less likely to contribute to back pressure.
Joe B