10 replies to this topic

[Mat Jackson]

Sheared this bolt of taking the chains out as part of a head change and stage 2 upgrade....

It’s the bottom one of the front top chain guide and doesn’t look lime a standard bolt...

2 key questions...

Any idea where I can get a replacement...

Any tips on drilling out the stud (steel stud in an aluminium block...)




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[gaffer1986]

Damn! Unfortunately I can't help you but I hope someone can.

[Mat Jackson]

Found a spare bolt - but drilling out the old one from the block will be a challenge...


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[vocky]

my advice would be to take the cylinder head off (as you are swapping that anyway), then remove the bottom end from the car (don't forget to drain the oil) and then drill out the snapped bolt. It's almost impossible to drill it out in the car and it only takes a few minutes to remove the bottom end.

 

Another option is to weld a washer to the snapped stud and then weld a nut to the washer

 

[sford]

If you weld the washer, be really careful not to weld the stud to the head. I know they're different metals but just be careful. My brother welded the stud he was trying to do the same thing to into the head on his MX5.

[Mat Jackson]

Welding is out, as the stud is a few mm in the hole... Still, that gives me a nice drill guide...


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[TheHood]

If its recessed then a hinge drill bit will allow you to centre a starter hole in the broken thread. Then you need a really good quality extractor set like Snap On EXDL10 that has left hand drill bits and warm the area to soften any thread lock that caused the bolt to snap in the first place. Oh, how I love thread lock!

[Mat Jackson]

Right angled drill head did the job!!


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[TheHood]

[2-20]

Do they break easily ?
I saw some repairs on YouTube for the upper bolt...

[Mat Jackson]

Don’t think it’s that uncommon...


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