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Old 11-25-2020, 10:43 PM   #1
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Breather

Is there any serviceable components inside the breather.
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Old 11-26-2020, 06:44 AM   #2
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You got me curious about this. I was expecting there to be at least a cleanable screen - so I looked it up on the CAT parts site.

There are no serviceable parts shown "inside" the breather assembly. If there is anything inside it that could go bad, it looks like you would have to buy the entire breather ($300).

I also looked in my CAT engine service manual, and found nothing on servicing or cleaning this.
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Old 11-26-2020, 09:16 AM   #3
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Yep the manual is where I found it when researching hoses. Would have thought there would have been at least steel wool or something. Almost curious enough to remove it and look but not quite there yet. Come down to how exposed it is when I start the hose replacement project. Had to pull off that and replace a couple of water hoses going to the kitchen slide due to a drip
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Old 11-26-2020, 09:19 AM   #4
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There is probably a mesh screen inside it - but not a serviceable/replaceable item.
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Old 11-26-2020, 09:47 AM   #5
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Not really having any trouble with it so for $300 will probably leave it. Way too many other serviceable parts to spend money on for now. Top of the list after I hit the lottery. Trying to talk my wife into at least 1 mega trip to Alaska after she retires so I want to do all the engine hoses, suspension and brakes. Not really having any trouble with anything but I did have to replace one air line to the front air bags, ppv valves and diaphragm on a tag axle lift can. Plan on replacing all the brake and suspension related rubber goods
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Old 11-26-2020, 02:46 PM   #6
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I hear ya on the "don't fix it unless its broken"...
I have the Alaskan trip on my bucket list too. Maybe in 2022.
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Old 11-26-2020, 03:05 PM   #7
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Back in the day ; before gas engines were fitted with PCV valves ; and still used road vent tubes .
Part of a oil change was to remove the breather , run solvent through the unit , for a few mins ; or till the solvent ran clear ; and blow dry with compressed air . Interior was a wire mesh , just in place to stop larger drops of oil from dripping onto the road.
I don't know what's inside the breather on my Cat, but I'd think if you check yours for air flow, and find no restriction , it should be fine.
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Old 11-26-2020, 06:02 PM   #8
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Haven’t pulled it yet but I do see vapor coming out. Depends on how exposed it is when I get into the hose job but if it’s just a couple of bolts and a gasket I may pull it just to learn a little more. Will post if I do
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Old 11-26-2020, 10:09 PM   #9
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It was recommended to wash the screen and metal mesh with solvent then blow out with air. So remove the breather clean it reinstall.

I did find some engines would start using oil and leaking oil from the crank seal and it was caused by the breather being sludged up. But as the oils improved it didn't happen as often.

Some of the later engines did have a replaceable element in the breather, but I think those came out after CAT got out of the on highway business.
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Old 11-27-2020, 10:58 AM   #10
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Thanks, will make a point of it when I do the coolant hoses. Sure it’s never been done. I know the oil and filters have always been changed regularly but at 67,000 miles and 1,647 engine hrs it couldn’t hurt
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Old 11-27-2020, 08:38 PM   #11
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Quote:
Originally Posted by CountryB View Post
You got me curious about this. I was expecting there to be at least a cleanable screen - so I looked it up on the CAT parts site.

There are no serviceable parts shown "inside" the breather assembly. If there is anything inside it that could go bad, it looks like you would have to buy the entire breather ($300).

I also looked in my CAT engine service manual, and found nothing on servicing or cleaning this.


Where did you get the parts listing like this?
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Old 11-28-2020, 07:18 AM   #12
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Originally Posted by slemnah View Post
Where did you get the parts listing like this?
Go to the CAT parts site https://parts.cat.com/en/catcorp
You have to register (it's free) and then with the engine serial number (usually the first three letters is enough) you go to the "SIS" link at top of page and search for the part or diagram you want.
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