New Oil Filler Cap
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Junior User
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New Oil Filler Cap
I'd need to replace the oil filler cap on my 300 inline 6. It would seem like this is an oridnary thing to get, and I can get just a plain chrome cap.
The one that was on there, though, had a small filter--looked like a tiny air filter--on top of it. I'm not sure if this was stock or aftermarket, or what the purpose was/is of the small filter. Anyone know?
Should I look for a replacement with the filter on top? Any suggestions where I can get that?
The one that was on there, though, had a small filter--looked like a tiny air filter--on top of it. I'm not sure if this was stock or aftermarket, or what the purpose was/is of the small filter. Anyone know?
Should I look for a replacement with the filter on top? Any suggestions where I can get that?
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Joined: Nov 2006
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From: Wichita, Kansas
AutoZone carries a basic chrome oil cap for under ten dollars. LMCTruck also has them, as well as several other online stores. The purpose is to 'vent' the crankcase of unwanted combustion gases. As air is sucked from the crank via the PCV valve connected to the carb or intake, it is replaced by outside air through this cap. The filter is there to prevent FOD (foreign object damage) to the engine.
Postmaster
Joined: Apr 2002
Posts: 3,613
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From: Coal country
Later vehicles have a rubber grommet in that hole, and a plasitc nipple.
This was connected via a larger hose to the air cleaner. Some mode used a separate filter element inside the air cleaner, some were setup to allow the air cleaner itself to do the job.
Like ChadwickMA says, fresh air enters the engine through the top of this cap, and the filter cleans it up.
Earlier trucks had the filter element inside that cap, with the entry holes all around, under the lip.
This was connected via a larger hose to the air cleaner. Some mode used a separate filter element inside the air cleaner, some were setup to allow the air cleaner itself to do the job.
Like ChadwickMA says, fresh air enters the engine through the top of this cap, and the filter cleans it up.
Earlier trucks had the filter element inside that cap, with the entry holes all around, under the lip.
Ford Parts Specialist
Joined: Nov 2006
Posts: 88,826
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From: Simi Valley, CA
66 F100 300 I6
Originally Posted by askopp
I'd need to replace the oil filler cap on my 300 inline 6. It would seem like this is an oridnary thing to get, and I can get just a plain chrome cap.
The one that was on there, though, had a small filter--looked like a tiny air filter--on top of it. I'm not sure if this was stock or aftermarket, or what the purpose was/is of the small filter. Anyone know?
Should I look for a replacement with the filter on top? Any suggestions where I can get that?
The one that was on there, though, had a small filter--looked like a tiny air filter--on top of it. I'm not sure if this was stock or aftermarket, or what the purpose was/is of the small filter. Anyone know?
Should I look for a replacement with the filter on top? Any suggestions where I can get that?
The air cleaner has a nipple that a neoprene smog hose slips on...that hose goes to the oil cap, which has a hole for a rubber grommet. A 90 degree plastic fitting inserts into the grommet where the other end of the hose attaches. There is no filter in the cap, nor a separate filter in the aircleaner. Those came several years later.
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From: Coal country
Askopp and ND: I may not have explained my comments well.
The earlier trucks, such as was on my old 352, had a PCV system, but no supply hose from the air cleaner to the cap. Instead the cap was a filter in and of itself, with air admitted into the cap through a series of holes punched into the underside of the cap's lower lip.
Later ones had the air supply through the top of the cap.
Did this make it clearer?
PS: I have some of both, mostly in my parts bins.
The earlier trucks, such as was on my old 352, had a PCV system, but no supply hose from the air cleaner to the cap. Instead the cap was a filter in and of itself, with air admitted into the cap through a series of holes punched into the underside of the cap's lower lip.
Later ones had the air supply through the top of the cap.
Did this make it clearer?
PS: I have some of both, mostly in my parts bins.
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Banjopicker,
Please give me call (299-6884) or drop me a private email.
Regards and thanks,
Andrew
Please give me call (299-6884) or drop me a private email.
Regards and thanks,
Andrew
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Ford Parts Specialist
Joined: Nov 2006
Posts: 88,826
Likes: 785
From: Simi Valley, CA
Originally Posted by banjopicker66
Askopp and ND: I may not have explained my comments well.
The earlier trucks, such as was on my old 352, had a PCV system, but no supply hose from the air cleaner to the cap. Instead the cap was a filter in and of itself, with air admitted into the cap through a series of holes punched into the underside of the cap's lower lip.
Later ones had the air supply through the top of the cap.
Did this make it clearer?
The earlier trucks, such as was on my old 352, had a PCV system, but no supply hose from the air cleaner to the cap. Instead the cap was a filter in and of itself, with air admitted into the cap through a series of holes punched into the underside of the cap's lower lip.
Later ones had the air supply through the top of the cap.
Did this make it clearer?
Then I realised that except for the fact the oil cap is sealed on my 1965 CA made and sold F100..everything we have is identical. CA was the first state to begin using a closed system, in model year 1961.
Instead of a hose to the aircleaner, the CA 352's have a nipple at the front of the carb spacer, the rear of the right valve cover has a rubber grommet with a smog valve inserted. A hose routes between the two. (illustration section 66.3, pg 2).
It's a darn good thing I just bought a CD of the 64-72 parts book (which is easier on the eyes than a viewer), otherwise, I wooda had to drive 8 miles RT to the storage unit to see WTF my truck has!
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