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Broken Oil Pan Bolts
Posted by: chrisverble ()
Date: October 09, 2019 04:03PM

Well the left handed bits/extractors didn't work.

I have two broken, and don't know what my options are. I don't have a welder.

I was getting frustrated so I had to walk away.

Nashville, TN
1961 Rampside

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Re: Broken Oil Pan Bolts
Posted by: JimBrandberg ()
Date: October 09, 2019 05:25PM

So what happened with the drill bits, not in the center of the bolt or...?

Can you use a hammer and punch to try to get them turning?

I think I've probably broken off more "easy outs" than success stories with them.

Jim Brandberg
Isanti, MN
CorvairRepair.com



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Re: Broken Oil Pan Bolts
Posted by: chrisverble ()
Date: October 09, 2019 06:03PM

I guess they weren't perfectly centered. I have a quick lift so I have some space, but gravity isn't on my side

I think I'm going to drill the bolt out, then use a thread repair kit to fix the thread.

Nashville, TN
1961 Rampside

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Re: Broken Oil Pan Bolts
Posted by: MonzaJPD61 ()
Date: October 09, 2019 07:25PM

Use easy out. For this application, it'll get the job done. Choose as large an easy out as you can fit without getting into your threads - less apt to break.

B'ham, AL
1961 Monza coupe 98hp, 4spd
1963 Monza coupe 102hp, pg
Vulcan Corvair Enthusiasts
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Re: Broken Oil Pan Bolts
Posted by: MattNall ()
Date: October 09, 2019 07:28PM

JPD... on a 1/4" bolt???

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Re: Broken Oil Pan Bolts
Posted by: MonzaJPD61 ()
Date: October 09, 2019 07:42PM

Yes, I would, but I don't have a welder...yet.
Have had good success with little HF screw extractor set that comes with companion drill bits.

B'ham, AL
1961 Monza coupe 98hp, 4spd
1963 Monza coupe 102hp, pg
Vulcan Corvair Enthusiasts
[corvaircenter.com]

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Re: Broken Oil Pan Bolts
Posted by: Frank DuVal ()
Date: October 09, 2019 08:16PM

Quote
Chris
Well the left handed bits/extractors didn't work.

Explain.

The bits did not drill a hole?

The bits did not drill a hole to match the extractor?

The drill bit broke in the hole?

The extractor broke in the hole?

What extractor? Many styles out there. Some do better than others, depends on why the bolt broke, metallurgy, etc.

Why did the bolt break? What was it doing when you broke it? Or did you find it that way?

Blind hole or clear hole? Both exist on the oil pan.

Quick lift way better than all the work I did on a floor jack and jack stands for years. Gravity makes the chips fall out of the hole, better than having the chips stay in the hole..... Just need eye protection.winking smiley

Lubricate the drill bit. I would say to lubricate the broken bolt, but I do not know yet why it broke.

I recently had luck with a spline style extractor made by Blue Point.

Frank DuVal

Fredericksburg, VA

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Re: Broken Oil Pan Bolts
Posted by: chrisverble ()
Date: October 10, 2019 05:59AM

Frank DuVal Wrote:
-------------------------------------------------------
>
Quote
Chris
> Well the left handed bits/extractors didn't work.
>
>
> Explain.
>
> The bits did not drill a hole?
>
> The bits did not drill a hole to match the extractor?
>
> The drill bit broke in the hole?
>
> The extractor broke in the hole?
>
> What extractor? Many styles out there. Some do better than others, depends on why the bolt broke, metallurgy, etc.
>
> Why did the bolt break? What was it doing when you broke it? Or did you find it that way?
>
> Blind hole or clear hole? Both exist on the oil pan.
>
> Quick lift way better than all the work I did on a floor jack and jack stands for years. Gravity makes the chips fall out of the hole, better than having the chips stay in the hole..... Just need eye protection.winking smiley
>
> Lubricate the drill bit. I would say to lubricate the broken bolt, but I do not know yet why it broke.
>
> I recently had luck with a spline style extractor made by Blue Point.

Bolt head snapped off when putting new gasket on oil pan.

Just a terrible area to try and use an extractor. Drilled the hole in bolt but the extractor wouldn't grab.

I see your picture, and yea it would have been easier if I could take the part off the car and on the work bench.

Going to try helicoils next

Nashville, TN
1961 Rampside

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Re: Broken Oil Pan Bolts
Posted by: Spectre ()
Date: October 10, 2019 06:07AM

The last engine I built had a few oil pan blot holes that were stripped. I went ahead and helicoiled all of the oil pan bolt holes.

David Clamp


1965 Corsa convertible - 140 4spd/3.55/AM-FM

2013 Mustang GT convertible - 5.0, 6spd auto, Procharger i-1

2003 Miata SE - 6spd manual (wife's toy)

"Victory is mine!" - SG

Norman, OK

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Edited 1 time(s). Last edit at 10/10/2019 06:48AM by MattNall.

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Re: Broken Oil Pan Bolts
Posted by: chrisverble ()
Date: October 10, 2019 06:48AM

Spectre Wrote:
-------------------------------------------------------
> Th elast engine I built had a few oil pan blot holes that were stripped. I went ahead and helicoiled all of the oil pan bolt holes.


Thanks, thats the plan. Just need to drill out the broken bolts.

Nashville, TN
1961 Rampside

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Re: Broken Oil Pan Bolts
Posted by: Frank DuVal ()
Date: October 10, 2019 09:30AM

Usually when the head snaps due to overtorquing the fastener on oil pan bolts, the left handed drill bit usually grabs and backs them out.

If it is a clear hole, a right hand drill bit can just run it out the other side, which is good too.thumbs up

Blind hole gets left handed drill bits.

Extractors have the correct size hole to drill stamped on them.

Corvair oil pan is in the clear, no need to get it in another position to do any drilling. Easy peasy.

A bolt that rusts in a hole and breaks the head off is a different animal. Those make a preacher cuss as they say...... That is when extractors are mostly useless.

Drilling a steel bolt out of an aluminum structure is not easy. Much easier to get the bolt to unscrew from the aluminum. Slightly off center and the drill bit goes to the easy to drill aluminum, so even an insert will not line up with the oil pan holes!

Frank DuVal

Fredericksburg, VA

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Re: Broken Oil Pan Bolts
Posted by: corventure Dave ()
Date: October 10, 2019 11:38AM

Another trick I have used for oil pan, top cover and valve cover bolts.

Take a Dremel tool with a small cut off wheel. I have cut a slot in the bolt to extract it with a small flat screwdriver. I have done this even when the bolt has broken off below the aluminum surface. A slight cut in the aluminum will not create a oil leak issue. Be sure to make the cut across the middle of the bolt.
If the bolt is tight, heat may need to be applied.

This is not an ultimate method, but an alternative that I have used the years.

Corventure Dave

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