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I've buggered up a cam carrier Torx bolt......help! - Engine/Ancilliaries - The Lotus Forums Jump to content
glynherron

I've buggered up a cam carrier Torx bolt......help!

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Title says it all really.  When taking of the cam carrier, removing the bolts (in the correct sequence), I got carried away, and the socket slipped, stripping the 'corners' off the torx head.

 

Before I make it worse, what are your suggestions?

 

There is not much room in there.....

 

Cheers

 

 

Edited by glynherron

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If there's something left of the bolt head for the socket to engage with try re-fitting all the other bolts and tighten them up to the 15 ft/lb torque loading. Then try to remove the damaged bolt.

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Engine out of the car?

 

Worst case, consider a small grinder and abrade the head off, or just abrade a couple of flats to get some sort of socket on it. You would have to ideally block off all oilways and then give a very thorough wash before parts are re-assembled.

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I've had that happen, long time ago.  

 

I had to drill off the head of the bolt, remove the cam and then remove the stud left behind.  It's not too bad, just make sure to only drill down to pop the head of the bolt off.  Make sure you drill in the center.

 

For future reference, the proper technique is to use a long breaker bar handle so you can use a little force without straining and slipping off, and use the other hand to stabilize the socket on the Torx bolt head.

 

P4021865.JPG


Travis

Vulcan Grey 89SE

My Lotus Photo and Projects Album

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I have a set of nasty little sockets that can deal with things like this.  Encountered a few, and always managed to get them out so far.

 

Do what Derek says, then see what you can find that'll grab it.


British Ambassador to Florida, New York, Denmark and Newfoundland.  And Sweden.

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Yeah, the engine is out having a bottom end rebuild.  Really annoyed with myself.  Focusing on the losening sequence rather than correct technique.

Travis, the bolt feels like a hard material and not 'soft', will it drill easily enough with standard steel twist drills or is a specialist drill required?  Thanks for the photo and advice.  Makes a lot of sense.


Gary, what is this 'set of nasty little sockets'??

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On eBay, search for 'Irwin bolt grip'.  Similar to these.  An 8mm with reasonable down force normally does the job.  Also the Craftsman universal range is pretty good.

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British Ambassador to Florida, New York, Denmark and Newfoundland.  And Sweden.

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Yeah, the engine is out having a bottom end rebuild.  Really annoyed with myself.  Focusing on the losening sequence rather than correct technique.

Travis, the bolt feels like a hard material and not 'soft', will it drill easily enough with standard steel twist drills or is a specialist drill required?  Thanks for the photo and advice.  Makes a lot of sense.

Gary, what is this 'set of nasty little sockets'??

The bolts are actually soft, easy to drill.  Make sure to make a divot in the center first to keep your drill centered.  You may use a Dremel with a carbide bit to do that.

 Or you could use a die-grinder with a carbide bit to take off the head of the bolt as well..

 

You only need to remove the 8mm center of the head, not the whole flange, then the head will pop off.


Travis

Vulcan Grey 89SE

My Lotus Photo and Projects Album

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Before grinding or drilling and being left with a whole pile of swarf to clean out, I'd try one of the Irwin sockets like Sparky suggested or even one of those Gatorgrip universal sockets, although not sure how much torque force the latter is able to handle.


Chunky Lover

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Thanks Guys, advice greatly received.  Found the sockets which Sparky recommends at Machine mart, which is not too far away, but will also buy some new drills!

 

I'll let you know how I get on.

 

Thanks

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Or you could try these..cam action tightens the grip as you apply force

http://chicagobrand.co.uk/product/7-piece-socket-set-38-metric/.

If you don't want to buy a set, pm me and I'll send you a loaner if you let me know what size.

Dave

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I would try the cam-grip type socket first - with the engine out of the car that should do the trick. If you do need to resort to drilling as Travis noted it is CRITICAL to start your drill in the center. I also would recommend left-handed or reverse twist drills so you are rotating the same direction as you would when removing the bolt. There are also specialty extractors available which have a small reverse-drill carbide tip which are easier to control than a full-size drill bit - Craftsman makes a set. I have not had to remove a cam tower bolt with that particular tool but I have had great success removing sheared bolts. I usually use a sharp-point punch to make a centered dimply in the bolt or fastener, then reverse drill using that dimple to stabilize the drill location. 

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Update. Those sockets recommended by Gary are amazing. Didn't work straight away so I gently tapped it whilst using a long bar. Worked a treat so thanks Gary and Travis. Also used the tool to remove the exhaust studs from the head as new ones are going in. What's next. ?....

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Great news Glyn!  Always nice when you don't have to get the drill out.


British Ambassador to Florida, New York, Denmark and Newfoundland.  And Sweden.

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Recommissioning Glynn ?


Caught between a rock and a hard place in a catch 22 situation, So its 6 of one and half a dozen of the other. Your damned if you do, but your damned if you don't so shut your cock!!!!!!!!!!!

Lotus Espirt Turbo S3    

Lotus Esprit S4 

Lotus Elise S2 Sport 130

pig_zps6d7342f1.jpg

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Hi Paul. Yeah. Full engine rebuild. New clutch. Seals in gearbox. Engine mounts. Alunox exhaust manifold. Turbo. Oil coolers..........

Gary, I really could have kissed you when it came out. Mmmmm that sounds quite wrong! !!

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I'll dust off my cabin crew uniform...


British Ambassador to Florida, New York, Denmark and Newfoundland.  And Sweden.

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RichardBranson.png


Caught between a rock and a hard place in a catch 22 situation, So its 6 of one and half a dozen of the other. Your damned if you do, but your damned if you don't so shut your cock!!!!!!!!!!!

Lotus Espirt Turbo S3    

Lotus Esprit S4 

Lotus Elise S2 Sport 130

pig_zps6d7342f1.jpg

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Now, I don't mind being called a mincing aisle queen trolley dolly, but aligning me with the beardy twat?  That's fightin' talk.  Pigtails at dawn.   :2guns:


British Ambassador to Florida, New York, Denmark and Newfoundland.  And Sweden.

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Well just refitted the cam carriers to 22nm. They must have been previously fitted using a crow bar. No wonder the bolts got chewed up! Some butchers out there!

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Shade tree PO's without a service manual :) Gotta love 'em.


Vanya Stanisavljevic '91 Esprit SE | '91 Elan SE | '97 XK8

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