DIY oil cap breather how-to

[beingblueeyes]

This is a basic how-to on making a oil cap breather, so before I begin just a word of warning
*I am not responsible for anything thing that happens to your motor as a result of building this or any injury’s acquired when building this

Now that that’s out of the way let’s begin. There are other company’s out there that make a oil cap breather but charge $40+ for them. You yes YOU can built one for sub 15$ if you have some tools at your disposal amf about 15 min of your time
Parts needed:
all parts from Summit racing
MRG-6375 VC BREATHER GROMMET CLOSED $2.25
SUM-G3417 BREATHER PUSHIN COTTON/GAUZE $10.95

Tools needed:
Drill press or drill
1” wood hole bit
Something to enlarge a plastic hole (1 ¼ drill bit would speed up making this by 10 min)

Tools is used:



1: take the oil cap you want to make a breather out of and using the 1 inch wood hole bit drill throw the oil cap using the inside to center the bit

2: from the top side of the oil cap start to enlarging the hole for the grommet until it is 1 1/4 inches across (this doesn’t need to be exact but the closer the better, take your time doing this and test fit the grommet and breather periodically

3: after you enlarge the hole in the top of the oil fill cap so you can insert the grommet and then the breather cut a hole in the bottom of the grommet.


4: clean the oil cap and make sure you have all the plastic shaving out of it
5: assemble and enjoy the money you just saved by putting it in your “next upgrade” fund

[TXsilverado]

im assuming you did the PCV delete? get ready to change your oil more often.

[beingblueeyes]

ive done pcv deletes on many past cars and they ran for 160k+ miles (my current record is 244,xxx miles) after tear down the bearings looked normal for the mileage on the vehicle and oil was always changed every 3800-4000 miles.

[pl4yboy]

I vented my PCV on my 08 and had no oil issues in 40k miles. I removed it from the intake tube and simply stuck a filter on the PCV hose.

[TXsilverado]

I vented my PCV on my 08 and had no oil issues in 40k miles. I removed it from the intake tube and simply stuck a filter on the PCV hose.

my theory, it gives the motor plenty ventelation to vent the bad fumes, but does nothing for getting rid of moisture. especially if you just connect the two valve covers with a hose and put a breather on the oil cap. a breather on both covers is how i would go if i did it. but even with that, the vapors vent, but the moisture gets caught in the filter and drips back down when the motor cools off.

[pl4yboy]

Good theory. I've never thought of that.

[farmtruc]

IF you notice any vapor smell in the cab you can always take the vent to the air filter. That way the smell gets sucked up and recycled.

[EmmerichLSx]

I just have breathers on my valve covers. I've drained the oil before and could see the moisture. At first I thought coolant was getting into the oil.

[TXsilverado]

I just have breathers on my valve covers. I've drained the oil before and could see the moisture. At first I thought coolant was getting into the oil.

exactly my point. a pcv system would have sent that moisture into the intake and burnt it off along with getting rid of the fumes. the problem is the amount of oil it sends to the intake with it. theres no problem putting a filter on each valve cover...just change the oil more often. my truck sits for weeks to months at a time so im trying to figure out the best way to keep a pcv setup, but not pour a quart of oil into my intake every 1k miles.

[bangbangskeetskeet]

exactly my point. a pcv system would have sent that moisture into the intake and burnt it off along with getting rid of the fumes. the problem is the amount of oil it sends to the intake with it. theres no problem putting a filter on each valve cover...just change the oil more often. my truck sits for weeks to months at a time so im trying to figure out the best way to keep a pcv setup, but not pour a quart of oil into my intake every 1k miles.

Catch can will take care of that...