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 Rounded valve cover hex head

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Kathakali
Montanarolo
Montanarolo
Kathakali

Posts : 10
Join date : 2019-01-29

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PostSubject: Rounded valve cover hex head    Rounded valve cover hex head  Icon_minitime1Sun Feb 24, 2019 4:45 pm

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Goddamn valve cover screw is rounded. How do I get it out ?

At my wits end
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Pete Roper
GRiSO Capo
GRiSO Capo
Pete Roper

Posts : 6306
Join date : 2013-05-29
Age : 62

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PostSubject: Re: Rounded valve cover hex head    Rounded valve cover hex head  Icon_minitime1Sun Feb 24, 2019 4:58 pm

Get the Torx bit that just slips inand hammer it in then carefully turn the bolt out. Put some anti seize on the new ones and don't over tighten them.

Make sure you use the correct tampons for your bike.
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sideshowbob
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sideshowbob

Posts : 516
Join date : 2017-08-06
Age : 64

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PostSubject: Re: Rounded valve cover hex head    Rounded valve cover hex head  Icon_minitime1Sun Feb 24, 2019 5:03 pm

Small sharp chisel, so it can bite into that groove at an angle. Tap tap tap, it will come out.
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kiwi dave
Tiradritto
Tiradritto
kiwi dave

Posts : 327
Join date : 2014-04-23
Age : 71

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PostSubject: Re: Rounded valve cover hex head    Rounded valve cover hex head  Icon_minitime1Sun Feb 24, 2019 6:54 pm

I've had some luck with left-handed drills. Try and get the center with a small drill, and then increase the size. If it still doesn't loosen, use a 1/4" one to take the top off the bolt, and then with the cover removed, hopefully can get a pair of vice-grips on the remainder.
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OldMojo
Carlotto
Carlotto
OldMojo

Posts : 25
Join date : 2018-04-10

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PostSubject: Re: Rounded valve cover hex head    Rounded valve cover hex head  Icon_minitime1Mon Feb 25, 2019 2:24 pm

Here's my method, in addition to the other fine suggestions:

Use a center punch for locating drill bits, and make a nice healthy divot on a place on the bolt head with some clean real estate. The closer to the edge the better, but far enough inboard that you don't peen the outer circumference out. Three good whacks, depending on material. Then angle the punch so it's pointing counter-clockwise, and make some firm, measured taps in the direction of removal. If you start to deform your divot without the bolt breaking free, repeat at another clean spot on the bolt head.

I work on industrial machinery and have to do this A LOT! This works on probably 80% of the broken bolts I have to deal with, and is particularly effective on bolts that have broken off flush.

Use patience and care, (and plenty of spray lube) and chase the bolt out with the center punch - the extractors stay in the tool box, as God intended.
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Bulldog9
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Bulldog9

Posts : 309
Join date : 2016-05-14

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PostSubject: Re: Rounded valve cover hex head    Rounded valve cover hex head  Icon_minitime1Tue Feb 26, 2019 4:30 pm

+1 on the Torx suggestion. You can also use a dremel to cut a slot across the top and use a flathead screwdriver.
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eeyore
Grignapoco
Grignapoco
eeyore

Posts : 107
Join date : 2016-09-09

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PostSubject: Re: Rounded valve cover hex head    Rounded valve cover hex head  Icon_minitime1Wed Feb 27, 2019 12:43 am

These screws don't seem particularly well made.
I always use good quality tools but the hex key doesn't feel like a good fit.
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Grisonut
GRiSO
GRiSO
Grisonut

Posts : 1318
Join date : 2014-01-02

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PostSubject: Re: Rounded valve cover hex head    Rounded valve cover hex head  Icon_minitime1Wed Feb 27, 2019 5:12 pm

kiwi dave wrote:
............I've had some luck with left-handed drills..............
This^^^
Never failed me yet, and since it's not likely that these valve cover bolts are torqued down to humongous specs, It will come out easy for you.
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motor-timothy
Biondino
Biondino
motor-timothy

Posts : 295
Join date : 2016-12-20

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PostSubject: Re: Rounded valve cover hex head    Rounded valve cover hex head  Icon_minitime1Thu Feb 28, 2019 2:02 pm

Grisonut wrote:
kiwi dave wrote:
............I've had some luck with left-handed drills..............
This^^^
Never failed me yet, and since it's not likely that these valve cover bolts are torqued down to humongous specs, It will come out easy for you.

I have to agree with this. I used a left-handed drill to remove a valve cover bolt stem of which the head had snapped off. Worked like a charm.
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Kathakali
Montanarolo
Montanarolo
Kathakali

Posts : 10
Join date : 2019-01-29

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PostSubject: Re: Rounded valve cover hex head    Rounded valve cover hex head  Icon_minitime1Sun Mar 31, 2019 4:37 pm

sideshowbob wrote:
Small sharp chisel, so it can bite into that groove at an angle. Tap tap tap, it will come out.


That worked perfectly! Thank you so much.
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GHTE
Nibbio
Nibbio
GHTE

Posts : 560
Join date : 2015-02-09
Age : 65

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PostSubject: Re: Rounded valve cover hex head    Rounded valve cover hex head  Icon_minitime1Mon Apr 01, 2019 2:15 pm

Go with Petes suggestion first me thinks. Don't ask how I know this is the easiest and best way.
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