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distributor hold down MISSING [message #86579]

Sun, 30 May 2010 05:58

hertfordnc

Messages: 1164
Registered: September 2009
Location: East NC

Karma: 0

Senior Member

pretty strange, the coach ran fine but when i bumped the distributor in the course of removing the manifold, it moved.

Underneath where the clamp should have been there is just a barely visible remnant of a broken stud.

I'm not optimistic about an EZ-out. I think i want to drill through and tap a new hole.

What's on the other side of the stud? bell housing?

If i keep a vaccum on the drilling operation can i risk a few chips going into the hole?

thanks

Dave

Dave & Ellen Silva Hertford, NC 76 Birchaven, 1-ton and other stuff Currently planning the Great american Road Trip Summer 2021 It's gonna take a lot of Adderall to get this thing right.

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Re: [GMCnet] distributor hold down MISSING [message #86580 is a reply to message #86579]

Sun, 30 May 2010 07:03

Steven Ferguson

Messages: 3447
Registered: May 2006

Karma: 0

Senior Member

Dave,
The bolt that goes through the hold down is short, about 1/2" of
threads are in the block. If the intake is off the best you can do is
lay a rag in the lifter valley, keep it tight against the sides where
chips could end up, stuff a rag tightly into the dist shaft hole.
Drill it out, retap and you're done. A vacuum does a good job
cleaning chips up even when they are covered with oil. It's hard to
imagine anyone breaking that bolt. It just doesn't need to be that
tight. A nut and stud are a good way to go.

On Sun, May 30, 2010 at 3:58 AM, dave silva <gmc@davesilva.com> wrote:
>
>
> pretty strange, the coach ran fine but when i bumped the distributor in the course of removing the manifold, it moved.
>
> Underneath where the clamp should have been there is just a barely visible remnant of a broken stud.
>
> I'm not optimistic about an EZ-out. �I think i want to drill through and tap a new hole.
>
> What's on the other side of the stud? bell housing?
>
> If i keep a vaccum on the drilling operation can i risk a few chips going into the hole?
>
> thanks
>
> Dave
> --
> Free to good home- the rest of a 1974 GMC. good for extension, or trailer. �But you gotta' take the whole thing -zip 27944- rear wheels, glass, etc.
> _______________________________________________
> GMCnet mailing list
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>

--
Steve Ferguson
'76 EII
Sierra Vista, AZ
Urethane bushing source
www.bdub.net/ferguson/
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Re: [GMCnet] distributor hold down MISSING [message #86585 is a reply to message #86579]

Sun, 30 May 2010 08:02

emerystora

Messages: 4442
Registered: January 2004

Karma: 13

Senior Member

On May 30, 2010, at 4:58 AM, dave silva wrote:
>
>
> If i keep a vaccum on the drilling operation can i risk a few chips going into the hole?

Put a lot of grease on the drill bit and chips will stick to it. As you are drilling clean it and regrease it.

Emery Stora
77 Kingsley
Santa Fe, NM

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Re: distributor hold down MISSING [message #86590 is a reply to message #86579]

Sun, 30 May 2010 08:50

Matt Colie

Messages: 8547
Registered: March 2007
Location: S.E. Michigan

Karma: 7

Senior Member

Dave,

Read this carefully.
GM distributor clamp studs are not an uncommon failure. They were a soft stud and not likely to damage the threads in the block. I bet you can save it IF:

Protect the engine from falling chips, use rags and grease to great abandon.
Flatten the surface of the stud so you can seen the center.
Punch the center.
Drill a small (like 1/8) hole through the stud.
Try a small EZ-out (might as well, could save next steps)
(Remove the EX-out if you have to go on.)
Heat the boss the stud is in with a heat gun (preferred) or torch. Try to put heat on the stud if you can. Get it as hot as you dare.
Pour on Power Steering Fluid or AFT. (A pump oil can is good for this.) If it does not smoke, you did not get it hot enough.
When it cools, try the EZ-Out again.
I bet it works now.

The PSF or AFT will wick into the hot joint as the heat has crushed the corrosion scale that formed there.

Matt

Matt & Mary Colie - Chaumière -'73 Glacier 23 - Members GMCMI, GMCGL, GMCES
Electronically Controlled Quiet Engine Cooling Fan with OE Rear Drum Brakes with Applied Control Arms
SE Michigan - Near DTW - Twixt A2 and Detroit

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Re: distributor hold down MISSING [message #86600 is a reply to message #86590]

Sun, 30 May 2010 10:49

Harry

Messages: 1888
Registered: October 2007
Location: Victoria, BC CANADA

Karma: 3

Senior Member

mcolie wrote on Sun, 30 May 2010 06:50

Dave,

The PSF or AFT will wick into the hot joint as the heat has crushed the corrosion scale that formed there.
Matt

I've seen a parrafin candle used for the same purpose.

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Re: distributor hold down MISSING [message #86608 is a reply to message #86590]

Sun, 30 May 2010 12:32

Mike O'Connell

Messages: 53
Registered: November 2008
Location: Deerfield MA

Karma: 0

Member

Just don't break the EZOut.
They are tool steel hard and very difficult to drill out.
Don't ask me why I know this.

Mike O'Connell Deerfield, MA '75 Eleganza

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Re: distributor hold down MISSING [message #86615 is a reply to message #86608]

Sun, 30 May 2010 14:08

hertfordnc

Messages: 1164
Registered: September 2009
Location: East NC

Karma: 0

Senior Member

Mike O'Connell wrote on Sun, 30 May 2010 12:32

Don't ask me why I know this.

Same reason i said i was not optomistic about it in the first place Very Happy

Dave & Ellen Silva Hertford, NC 76 Birchaven, 1-ton and other stuff Currently planning the Great american Road Trip Summer 2021 It's gonna take a lot of Adderall to get this thing right.

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