Fitting size for 10-bolt vent

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Dec 21, 2014 | 10:43 AM

JJKJ

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From: Cedar Rapids, IA

Fitting size for 10-bolt vent

I found a thread on replacing the rear vent with a pipe thread/nipple fitting to add a vent line. I didn't bookmark the thread and for the life of me can't find it again with multiple searches.

I'm looking for fitting size that works well in the stock 10-bolt vent hole. My plan is to run a vent line to either a small filter or catch can.

Thanks!

Dec 21, 2014 | 11:32 AM

FirstYrLS1Z

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From: Euclid,Ohio

I use 1/4 npt
7th pic in the thread
https://ls1tech.com/forums/gears-axl...rend-my-z.html

Dec 21, 2014 | 11:43 AM

JJKJ

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Perfect, thanks! Was the hole the proper diameter or did you have to drill it prior to tapping?

Dec 21, 2014 | 12:39 PM

FirstYrLS1Z

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did it on 3 rearend housings so far,did not have to drill. 1/4 NPT requires a 7/16 drill,which,based on memory,the existing hole is or close to that size. The tap is difficult to start straight in line with the hole as the hole is not perpendicular to the surface where the hole is located. Also,iron/steel casting is difficult to tap. You can't force the tap in as in a normal tapping operation,in a little then back out,in a little then back out. have the fitting you're gonna use on hand to test the tapping depth.

I just ran the tubing to panhard bar.

Dec 21, 2014 | 12:49 PM

JJKJ

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Thanks again for the great info.

Dec 21, 2014 | 04:31 PM

dailydriver

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I did not even bother to tap/thread mine (was afraid of some shavings getting into the housing, despite the tap supposedly pulling them out in the other direction).

I just used a hammer to kind of swage it into the housing pumpkin and ran a hose clamped line out over the axle, pointing down.

Dec 21, 2014 | 04:51 PM

79_T/A

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Quote:

Originally Posted by dailydriver

Bingo. This works well. Personally, I took the stock plastic vent, popped the head off it. Ran a drill through it to enlarge the passage, put it into the housing with a dab of gear oil-proof RTV, and ran a 3/8in line to a puke can mounted on my watts link. Holds up to plenty of road course thrashings.