The Ford Barn

old ugly · 09-05-2021, 09:27 PM

has anyone seen or used an engine oil filler cap like this?
i am asking because its not vented. it was on the engine in my 28.

ou

Tom Endy · 09-05-2021, 11:48 PM

An oil cap on a Model A must surely be vented. A while back a friend sold a Model A to a guy who knew nothing about Model A's. He went to the local hot rod store and bought a bunch of nonsense stuff, including a non-vented oil filler cap. A few hours later he came to my friends house with oil pouring out the rear main like an open water spigot. We felt obligated to determine the problem. We dropped the pan expecting to find the return pipe had fallen out. It was intact and it was open. We removed the rear main cap and found the Babbitt was intact. We reinstalled the pan and when we went to put in new oil we discovered the unvented cap. We replaced it with a vented cap and the problem went away.

People have been known to put a Brillo pad in the cap thinking it will allow it to breath and prevent fumes from escaping. Bad idea!

Tom Endy

mercman from oz · 09-05-2021, 11:50 PM

Larger picture of Model A Oil Filler Cap that "old ugly" is asking about?

J Franklin · 09-06-2021, 12:20 AM

It looks like something that was handy and put to use. Go get the proper cap.

old ugly · 09-06-2021, 03:17 PM

yeah . ive never seen an oil cap that looked like it. i think someone must have put it on trying to seal the blowbye in the motor but created a bigger problem for themselves.

until i can get to G moirs i have a breathable soup can on it.

ou

wwirz · 09-06-2021, 07:20 PM

Sponsored Links (Register now to hide all advertisements)

The oil and gas filler caps MUST be vented. Get a Model A oil filler cap from one of the Model A parts distributors. You may consider getting the kit that direct the oil mist under the floor board. This will take car of any oil smell while driving and keeps the engine clean.

09-05-2021, 11:48 PM	#2
Tom Endy Senior Member Join Date: May 2010 Location: Southern California Posts: 3,131	Re: oil filler cap question An oil cap on a Model A must surely be vented. A while back a friend sold a Model A to a guy who knew nothing about Model A's. He went to the local hot rod store and bought a bunch of nonsense stuff, including a non-vented oil filler cap. A few hours later he came to my friends house with oil pouring out the rear main like an open water spigot. We felt obligated to determine the problem. We dropped the pan expecting to find the return pipe had fallen out. It was intact and it was open. We removed the rear main cap and found the Babbitt was intact. We reinstalled the pan and when we went to put in new oil we discovered the unvented cap. We replaced it with a vented cap and the problem went away. People have been known to put a Brillo pad in the cap thinking it will allow it to breath and prevent fumes from escaping. Bad idea! Tom Endy

09-05-2021, 11:50 PM	#3
mercman from oz Senior Member Join Date: May 2012 Location: Queensland, Australia Posts: 10,361	Re: oil filler cap question Larger picture of Model A Oil Filler Cap that "old ugly" is asking about?

09-06-2021, 12:20 AM	#4
J Franklin Senior Member Join Date: May 2010 Location: Oregon Posts: 5,962	Re: oil filler cap question It looks like something that was handy and put to use. Go get the proper cap.

09-06-2021, 03:17 PM	#5
old ugly Senior Member Join Date: Aug 2021 Location: alberta canada Posts: 585	Re: oil filler cap question yeah . ive never seen an oil cap that looked like it. i think someone must have put it on trying to seal the blowbye in the motor but created a bigger problem for themselves. until i can get to G moirs i have a breathable soup can on it. ou

09-06-2021, 07:20 PM	#6
wwirz Senior Member Join Date: May 2020 Location: Corning NY Posts: 244	Re: oil filler cap question Sponsored Links (Register now to hide all advertisements) The oil and gas filler caps MUST be vented. Get a Model A oil filler cap from one of the Model A parts distributors. You may consider getting the kit that direct the oil mist under the floor board. This will take car of any oil smell while driving and keeps the engine clean.