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Old 11-25-2008, 01:59 PM   #1
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Default dumb oil pan drilling question.

What are you guy's using to drill your oil pans? A hugemongous drill bit or a holesaw? I used a holesaw on my last car and had no problems. I just cant imagine finding a regular drill bit big enough and then finding a drill small enough to accept that bit and still fit in that tight spot there.
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Old 11-25-2008, 02:13 PM   #2
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A 37/64" drill bit. The diameter is smaller where it goes in the drill. It fit fine in my cordless dewalt.
A holesaw might be a good alternative but make sure you have the correct size.
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Old 11-25-2008, 02:18 PM   #3
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Old 11-25-2008, 06:23 PM   #4
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This should be one of those items where people can just borrow from the members here. Hell, if someone paid shipping both ways, they could use my set. I used it once and now I have a one size drill and tap that I will probably never use again.
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Old 11-25-2008, 10:59 PM   #5
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what about for a 1/2npt
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Old 11-25-2008, 11:01 PM   #6
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Quote:
Originally Posted by Turbo_4 View Post
what about for a 1/2npt

11/16" drill bit
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Old 11-25-2008, 11:05 PM   #7
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I allways use a Unibit, or step drill what ever you wanna call it. looks kinda like a christmas tree. very short, and makes perfectly round holes.
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Old 11-26-2008, 12:21 AM   #8
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i did 9/16". But i drilled smaller sizes first before I stepped up to that one.
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Old 11-26-2008, 07:03 PM   #9
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I'm just trying to figure out how I'm going to fit a long *** drill bit and drill there.
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Old 11-26-2008, 07:14 PM   #10
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It's been done, many times. Read page 12: http://www.bellengineering.net/templ...eries1,2,3.pdf

The gist of it is the hole doesn't have to be drilled perfectly straight. The tap should be straight though. For that stick the tap in a 12 point socket of the correct size (I forget what I used but it's common) and use some long extensions and it's easy to get it straight.
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Old 11-26-2008, 08:07 PM   #11
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Quote:
Originally Posted by f_devocht View Post
A 37/64" drill bit. The diameter is smaller where it goes in the drill. It fit fine in my cordless dewalt.
A holesaw might be a good alternative but make sure you have the correct size.

This is what I used, I had to buy a 1/2 drill. It cut through like butter.

You don't have to drill in perfectly straight. but when you use your tapp, get it straight.
I placed the tapp in the hole, and turned it by hand with a open wrench.

I wanted it right. And I have no leaks. It was so simple. but I was scared to death.

And were they recommended 1qt of mineral spirts oil......... I used a gallon of kroger brand veg, oil. It is thin like water. Super cheap, I wanted every particle out.
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Old 11-26-2008, 09:32 PM   #12
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If you have a drill bit and fitment issue...I frequently use a metal lathe at work. I can turn down a drill bit to fit it in your keyway of your drill. That's what I did to drill my oil pan. I can shorten drill bits, whatever you need done. I actually lathed the bit used for my car down to be accepted in a 3/8" chuck, and I used my buddies right angle drill. As far as drilling your oil pan...do the air regulator on the breather thing, and I'd recommend tapping it out to accept a ?pipe thread to -10AN fitting.
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Old 11-28-2008, 11:36 PM   #13
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Ok I did it...and it was a success....whew....

First I bought a 90 degree angle air drill and a step bit.


Even still there's barely enough room to get the ****** in there. I had to start at an angle, but once the bit was through I was able to straighten it out.



Yay... a hole...
Oh and I'm incredibly lucky. I picked the right spot to drill that hole because I narrowly avoided drilling through the pickup tube. I drilled right, and I mean right above it. You cant see it in the pic but it's there and fortunately doesn't even have so much as a scratch on it. 1mm down an I would be fucked right now.



It's straight... it just doesn't look like it in the pic.


And I didnt take a pic but the fitting threaded in nice and tight. So I'd say that this is a success? Didn't seem to get too many shavings in there either.
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Old 11-28-2008, 11:53 PM   #14
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long drill bit, no rinsing....ganster ****, few years ago now no problems. though i use black oem type silicone on the threads and then thread it in, no jb weld, to me it seems less prone to vibrations and heat cycles.
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