Cylinder head repair ? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

sleepertruck72 · 08-13-2013, 10:12 PM

So at work I had to pull the driver side head to attempt to remove a broken exhaust manifold bolt... The bolt at the very rear of the head.. #7 cyl. So I get the head out and try to get the broken bolt out using Snap on screw extractors...No luck. I didn't take an after pic but its not pretty. The drill bit went kinda sideways. My question is : How big a helicoil can I put in to finish this without damaging the head or hitting water jackets ?

crazy longhorn · 08-14-2013, 12:55 AM

I cannot answer your ? But will ask you 1....the 8 mm bolt is basically 5/16 ", is there enough material that can you drill & tap to 3/8 "? Just a thought, you might peel less material that way....Longhorn

sleepertruck72 · 08-14-2013, 01:21 AM

Quote:

Originally Posted by crazy longhorn

I cannot answer your ? But will ask you 1....the 8 mm bolt is basically 5/16 ", is there enough material that can you drill & tap to 3/8 "? Just a thought, you might peel less material that way....Longhorn

I think there should be enough material there. I guess I will find out tomorrow

Thanks crazylonghorn !

sleepertruck72 · 08-15-2013, 12:23 AM

Well good news ! I was able to helicoil the head and use the GM 8mmx1.25bolts for the exhaust manifold. I tried tapping new threads before that but my hole was too buggered up. My cell phone pics are crappy but I got her all back together and drove her for a while, no exhaust leak

engine didn't blow up or overheat so I guess it was a good day

sleepertruck72 · 08-15-2013, 12:26 AM

.......

08-13-2013, 10:12 PM	#1
sleepertruck72 Registered User Join Date: Nov 2007 Location: Turlock California 95380 Posts: 2,075	Cylinder head repair ? So at work I had to pull the driver side head to attempt to remove a broken exhaust manifold bolt... The bolt at the very rear of the head.. #7 cyl. So I get the head out and try to get the broken bolt out using Snap on screw extractors...No luck. I didn't take an after pic but its not pretty. The drill bit went kinda sideways. My question is : How big a helicoil can I put in to finish this without damaging the head or hitting water jackets ? Attached Images __________________ 72 C20 Longbed 05 1500 Z71

08-14-2013, 12:55 AM	#2
crazy longhorn Fabricate till you "puke" Join Date: Jun 2002 Location: Ill Posts: 9,402	Re: Cylinder head repair ? I cannot answer your ? But will ask you 1....the 8 mm bolt is basically 5/16 ", is there enough material that can you drill & tap to 3/8 "? Just a thought, you might peel less material that way....Longhorn __________________ 69 longhorn,4" chop,3/5 drop, 1/2 ton suspension/disc brakes,1 1/2" body drop,steel tilt clip, 5.3/Edelbrock rpm intake/600 carb, Hooker streetrod shorties,2 1/2" exhaust/ H pipe/50's Flows , 6 spd Richmond trans,12 bolt/ 3.40 gears....

08-15-2013, 12:23 AM	#4
sleepertruck72 Registered User Join Date: Nov 2007 Location: Turlock California 95380 Posts: 2,075	Re: Cylinder head repair ? Well good news ! I was able to helicoil the head and use the GM 8mmx1.25bolts for the exhaust manifold. I tried tapping new threads before that but my hole was too buggered up. My cell phone pics are crappy but I got her all back together and drove her for a while, no exhaust leak engine didn't blow up or overheat so I guess it was a good day Attached Images __________________ 72 C20 Longbed 05 1500 Z71

08-15-2013, 12:26 AM	#5
sleepertruck72 Registered User Join Date: Nov 2007 Location: Turlock California 95380 Posts: 2,075	Re: Cylinder head repair ? ....... Attached Images __________________ 72 C20 Longbed 05 1500 Z71



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