This is a small problem but it's got me. I put oil in my MH the other day and forgot to put the cap back and I lost it on the road. Does anyone know the part number of a replacement. I have an 04 Winne on a W21 with 8.1 engine. Any help would be appreciated.

Check parts houses and you might check for one to fit the 8.1 as I would think the cap would b an OEM item unique to the engine and not the Winnie.

Until then, stuff a rag in the filler pipe.

SidecarFlip wrote:Until then, stuff a rag in the filler pipe.You know the strange thing is the engine used to use a qt. of oil about every 500 mile and with the oil cap off it uses no oil and there is no blow by. Your right about putting the rag in it till I can find one. I done tried two caps.

Change the pvc valve.Stant part number 10114

OIL BREATHER CAP | Good Sam Community

enblethen
Nomad
Oct 12, 2018
Click on the one on the right. It takes you to the description. Same goes for the other.
charwan
Explorer
Oct 12, 2018
enblethen wrote:
I liked the wrong vehicle oil cap.
Here is another one with a 28MM diameter oil cap. Makes a trace over one inch in diameter.
Autozone

Give the number all the url did was take me to a page with several on it. Yes it would be a gig help if they gave the diameter.
enblethen
Nomad
Oct 12, 2018
I liked the wrong vehicle oil cap.
Here is another one with a 28MM diameter oil cap. Makes a trace over one inch in diameter.
Autozone
charwan
Explorer
Oct 11, 2018
IB853347201 wrote:
Did the same thing! lost my oil cap on my W20, 8.1. Stopped in at Westfall GMC Truck, Inc. parts department in Kansas City, MO, (816) 455-7262. Purchased a new one, no problem. was like $14. Part # for 8.1 workhorse oil filler cap is ACDelco 12574265 / ACD# FC210 and Winnebago W8800701.

Well I've tried 3 so far and no go. Is the #12574265 and FC 210 the same. I'm going to Chevy now. You might have known it was special.

The Dorman 42315 was a no go. Mine has a smaller neck than I've been able to fine.

CharWan
enblethen
Nomad
Oct 07, 2018
They must be informed that it is a Workhorse chassis.

Auto zone listings
charwan
Explorer
Oct 07, 2018
IB853347201 wrote:
enblethen wrote:
Oil cap at O'Reilly's auto parts

This is the one!

Thanks that is what I wanted, someone who had bought one. I have an Oreillauyo near me. I had done bought 2 and taken them back. Auto-zone said next choice was to order GM. I knew this was the best place to start. Many Thanks Charwan
IB853347201
Nomad
Oct 07, 2018
enblethen wrote:
Oil cap at O'Reilly's auto parts

This is the one!
IB853347201
Nomad
Oct 07, 2018
Did the same thing! lost my oil cap on my W20, 8.1. Stopped in at Westfall GMC Truck, Inc. parts department in Kansas City, MO, (816) 455-7262. Purchased a new one, no problem. was like $14. Part # for 8.1 workhorse oil filler cap is ACDelco 12574265 / ACD# FC210 and Winnebago W8800701.
SidecarFlip
Explorer III
Oct 07, 2018
If it quit using oil with no breather cap then you have a sticking PCV valve. Time to replace t. If you are cheap, like me, you can soak it in lacquer thinner and get the gunk out and put it back on.
enblethen
Nomad
Oct 07, 2018
Oil cap at O'Reilly's auto parts

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