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 bajachris88
A.k.a.: Chris Leete
23 Windows of Awesome
The international telephone dialing code for Antarctica is 672.
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 posted on September 11th, 2009 at 01:55 PM |
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Any tips for removing broken bolt threads in block?
To my surprise and a few curse words later, while i was torquing up the nut for hte flywheel the stud/bolt ( out of the four that mount the engine to
the gearbox) snapped. It was the bottom one.
it was a brittle fracture, and i was using a steel rod to lock it up with a flywheel bolt to hold it still while i torqued it up.
I have now torqued it up, but this bolts gone caput! (i got a spare in a spare block i can take out)
BUT! Has anyone got any advice to remove the 1inch of thread now stuck in the block? There is the tinest bump of meat left out of the bolt hole, and
the rest is inside the case.
(ô_!_/ô) (ô_!_/ô)
69' baja: kombi box, thing spindles, irs, disc front, type 3 rear drums, 2 inch lift kit, 31x10 rears. 
New engine in process: 94mm p&bs, 74mm C/w chomol Crank, 35.5x39 SP heads, turbo. Wierd combo, hopeful torque monsta! |
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Anthiron
A.k.a.: Nicko McKay
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| posted on September 11th, 2009 at 01:58 PM |
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get a screw driver on the tiny chunk and tap it with a hammer lightly, spinning it in the thread to un do it. or buy an easy out
62/60 model bug eye baja bug, (Full Build in Progress)
1974 Chevrolet Luv
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1979 Yamaha RX125 Two Stroke tracker project.
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68AutoBug
A.k.a.: Lee Noonan
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 posted on September 11th, 2009 at 05:13 PM |
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Hi Chris
depending on how hard the bolt is...
whether You can drill out the centre of the bolt
then fit an easy out into the bolt and unthread it..
drill the largest hole You can - in stages - 5mm - 8mm - etc..
if you can drill in the centre of the bolt, after drilling nearly to the edge of the thread You may be able to get the remainder out with a
screwdriver etc...
did You lubricate the thread and head of the bolts??
as that may be the reason it broke...
or it may have been over tensioned before..??
then again, I always use New bolts... grade 8.8 High Tensile..
cheers
LEE
- [size=4]Helping keep Air Cooled VWs on the road - location: SCONE in the Upper Hunter Valley - Northern NSW 320 kms NNW of SYDNEY--- [/size]
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68AutoBug
A.k.a.: Lee Noonan
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| posted on September 11th, 2009 at 06:16 PM |
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Hi again
If you are going to use ezi outs [also called other things]
drill the largest hole you can in the bolt so you are using the largest EZI OUT you can use...
My first experience, was a VW head stud, I just drilled a small hole and put the EZI Out in and snapped it off...
the metal of the EZI out was so hard, it couldn't be drilled...
I even bought some very hard drill bits... but no go..
You shouldn't have this problem as your bolt piece is just sitting there... it shouldn't be seized..
cheers
LEE
PS: spray some WD40 etc into the thread so its lubricated
and should make it easier to unscrew....
- [size=4]Helping keep Air Cooled VWs on the road - location: SCONE in the Upper Hunter Valley - Northern NSW 320 kms NNW of SYDNEY--- [/size]
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grumble
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| posted on September 11th, 2009 at 07:17 PM |
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Depending how tight the stud was inn the case,I would suggest using a left handed drill to drill it,use a small bit to drill a pilot hole and then
drill it with a bigger size. Mostly the drill will pick up and wind the broken bit out.Much easier than ezyouts which expand and force the stud out
into the case.
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 matberry
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| posted on September 11th, 2009 at 07:23 PM |
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I have the best result welding a large nut to the stud from inside the nut, but the biggest drama is the magnesium case....careful with the amount of
heat or the whole lot could go up.
Matt Berry Motorsports...air cooled advice, repairs and mods Ph 0408 704 662
OFF-ROAD,CIRCUIT,DRAG,STREET,ENDURANCE
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bajachris88
A.k.a.: Chris Leete
23 Windows of Awesome
The international telephone dialing code for Antarctica is 672.
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| posted on September 11th, 2009 at 07:47 PM |
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thanks guys for the awesome tips.
Should be alright then.
I haven't got any left hand threaded screws, nor easy outs. will see how much they are on monday.
yea, could be an interesting show Matt haha. i spose they TIG weld those kinda cases up though, and i'm crazy enough to give that kinda thing a go...
Quite clever idea really.
Again, thanks though, will give a go. With all 3 methods, ones bound to work for me!
(ô_!_/ô) (ô_!_/ô)
69' baja: kombi box, thing spindles, irs, disc front, type 3 rear drums, 2 inch lift kit, 31x10 rears.
New engine in process: 94mm p&bs, 74mm C/w chomol Crank, 35.5x39 SP heads, turbo. Wierd combo, hopeful torque monsta! |
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grumble
Son of Jim - Creator of Good
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| posted on September 11th, 2009 at 08:23 PM |
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No not left handed screws,left handed drills,they cut in the counterclockwise direction and as such when they bite and screw the stud out.
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 barls
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| posted on September 11th, 2009 at 08:29 PM |
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heres a tip to get them out dont break them in the first place
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Smiley
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| posted on September 11th, 2009 at 08:42 PM |
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If you have a small ammount of metal sticking out, get a hacksaw and cut a slot in the top of it. make sure you soak it in a rust off product or other
type of penetrant to help free it. Then get a flat screwdriver in the slot and give it a hit with a hammer. Then use the screwdriver to undo the bolt.
If this fails try a bit of heat in the metal of the case (butane soldering iron or something similar), and the methods mentioned above. Try with the
screwdriver first and if it doesn't come then worry about having to drill the bolt.
Smiley
If you said I was a Volkswagen man, you'd be right.
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grumble
Son of Jim - Creator of Good
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| posted on September 11th, 2009 at 09:05 PM |
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Another tip to avoid stud damage don't use them to hold the flywheel,use a VW spark plug spanner from the exhaust outlet to the flywheel teeth when
loosening and tightening the flywheel.There is a tool that bolts to the stud but it is not as good as the old plug spanner.Les
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Joel
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| posted on September 11th, 2009 at 09:15 PM |
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or better yet get a lenth of angle iron and drill a couple of holes to pick up 2 of the clutch bolts
and at the other end drill 2 for the wheel nuts, they work well to helping undo the axle nuts too
and +3 for ezyout
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pod
A.k.a.: paul mrvw061
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| posted on September 11th, 2009 at 11:01 PM |
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+4 for easy out,i have a bottom pulley with a length of pipe welded to it for doing up the flywheel ,i mainly made it this way for my semi auto drive
plate
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geodon
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| posted on September 14th, 2009 at 02:57 PM |
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I concur with mattberry. Put a nut over the hole & fill it with weld from a MIG. I will only add that you need to let it cool completely before
putting a spanner on it.
I mean overnight or at the very least a loooong lunch.
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