Triumphrat

Mattybee · 10-24-2009, 12:05 PM

Does anyone have any ideas how to get this bolt out. The head snapped off whilst I was trying to get it out. It is the screw which holds in the crankshaft positioning sensor. It sits ontop of the alternator cover.
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bigred900 · 10-24-2009, 12:16 PM

Go to Halfords and get a set of reverse thread extractor drill bits. Drill a small hole in the centre of the snapped bolt with a normal drill bit then swap to the reverse thread bit and back it out slowly and gently. Use lots of WD40 to ease the snapped bolt.

Ask me how I know this

Wayne

bigred900 · 10-24-2009, 12:17 PM

p.s

block up the hole in the crankcase, you DO NOT want shards of metal falling in there!!

W

Mattybee · 10-24-2009, 12:19 PM

thanks Wayne. The bolt is only about 4mm and will be awkward to get to with a drill!!!

Can you get right angle drills????

Cheers

bigred900 · 10-24-2009, 12:27 PM

you can get right angle drills but its a pain getting the pressure on it. I have had success with reverse drills on bolts smaller than that (front brake resevoir), it's about the only way I can think of to get them out. Just go careful.

Good luck

Jonny955 · 10-24-2009, 12:42 PM

Tip 1: If the remaining part of the srew is seized, try giving it a sharp tap using a punch and hammer. This should free-up the threads by breaking any corrosion etc. If you do this before attempting the drill-out extraction, it just might ease the removal.

Tip 2: Concentrate on getting the drill as centred as possible. With a bit of luck, the screw may collapse or loosed just from the drilling

Good luck.

Jon

Tiger-G · 10-24-2009, 01:52 PM

Wow, that is so unlucky

I suppose you could weld a blob onto it, then weld a bolt to the blob. The heat will losen the thread and just put a spanner on the bolt head.

Remember to take the battery connectors off, etc.

Good luck, mate

stanegoli · 10-24-2009, 04:59 PM

Quote:

Originally Posted by bigred900

Ask me how I know this

Wayne

price389uk · 10-25-2009, 08:17 AM

My first post (but I think I must)

I run an engineering workshop and we do an awful lot of thread repaid and bolt removal work.

Take it to a local machine shop now! This is a very small bolt in an aluminium casting and I can see big problems if you make a mistake. Steel screws are awful at locking into aluminium castings, with corrosion, making them very hard to remove. It is so easy to slip with the drill or allow it to wonder off and drill through the casting. then you may end up having to tap it out a bigger size.

I hate cheap stud removal tools as I have come across so many that have snapped making the bolt next to imposable to remove.

Please take it to an expert it could well cost you less in the end.

Sorry to be a doom merchant (I am normally a happy chap).

Chris.

tigg-ted · 10-25-2009, 09:20 AM

from your picture, it look like you've got swarf in the casing
which won't help the workings later. So as Graeme said block the hole. But it may be too late. Hope it's just the way the light hit the internals.
Looks like you've got a bit of work to do on the mating face aswell, some big gouges there!
I agree cheap tools ain't worth it!
They seem to use a steel thats not strong enough to remove a
siezed stud/sheared bolt. but are too hard to drill when broken.
Good luck if you decide to have a go.

And welcome to the forum Chris.