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 Damn it, how routine maintenance can spiral out of control

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motor-timothy
Biondino
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Join date : 2016-12-20

PostSubject: Damn it, how routine maintenance can spiral out of control   Fri Oct 12, 2018 10:46 am

So I decided to check & adjust the valve clearance & check the spark plugs. Normally an easy task, taking maybe 40 minutes to an hour if you do it slow like me. Unfortunately upon screwing back the left valve cover, I misread the torque value as 15Nm (Head fixing screws) instead of 8Nm (Head cover fixing screws), so one one the bolts snapped. It snapped about 3mm deep into the fixing point as well, so no protruding end to grab onto. I can really hit myself atm, so stupid.

So now I have to buy some sort of extractor, a new bolt, etc. so won't be riding this weekend. Damn it. Evil or Very Mad

So, any tips how to get the broken part out? The bolt is rather soft galvanized steel I think, so it shouldn't be super hard to get it out? Also maybe a good opportunity to replace these bolts with some better quality RVS or something. Does anyone happen to know a recommended vendor of those? Are there even any nice alternative valve cover bolts for our GRiSO?


This is how my sparkplugs looked like btw, after about 10.000km. Does this look too lean to you guys?

Left side plug:
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Right side plug:
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Last edited by motor-timothy on Fri Oct 12, 2018 3:44 pm; edited 1 time in total
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beetle
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PostSubject: Re: Damn it, how routine maintenance can spiral out of control   Fri Oct 12, 2018 2:41 pm

Hmm. Left looks like it could use a wee bit more. Have you adjusted the CO trim?

Never torque the valve cover screws. They just need a firm hand tightening.



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motor-timothy
Biondino
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PostSubject: Re: Damn it, how routine maintenance can spiral out of control   Fri Oct 12, 2018 3:43 pm

beetle wrote:
Hmm. Left looks like it could use a wee bit more. Have you adjusted the CO trim?


No I haven't. How much trim would you advise?

Quote :
Never torque the valve cover screws. They just need a firm hand tightening.

Lesson learned. Ordered a 4mm left rotating drill, hopefully that will get it out as I doubt it will be very tight. If I screw that up it will become more complicated.
Thankfully the valve cover is not directly screwed onto the cylinder but on the rocker arm support.


Last edited by motor-timothy on Sat Oct 13, 2018 1:57 pm; edited 2 times in total
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beetle
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PostSubject: Re: Damn it, how routine maintenance can spiral out of control   Fri Oct 12, 2018 3:53 pm

Try +3 for starters. Check plugs again after a few hundred km.


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davem
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PostSubject: Re: Damn it, how routine maintenance can spiral out of control   Sat Oct 13, 2018 2:28 am

Save that torque wrench for critical items such as head bolts. The majority are better done by hand.
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eeyore
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PostSubject: Re: Damn it, how routine maintenance can spiral out of control   Sat Oct 13, 2018 11:59 am

motor-timothy wrote:
beetle wrote:
Hmm. Left looks like it could use a wee bit more. Have you adjusted the CO trim?


No I haven't. How much trim would you advise?

Quote :
Never torque the valve cover screws. They just need a firm hand tightening.

Lesson learned. Ordered a 4mm left rotating drill, hopefully that will get it out as I doubt it will be very tight. If I screw that up it will become more complicated.
Thankfully the valve cover is not directly screwed onto the cylinder but on the valve housing.

Good luck with the extraction. Have you tried to rotate the broken bit with a small screwdriver or similar.
If you need to drill dont forget to mask the area to prevent swarf falling into the oily bits.
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motor-timothy
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PostSubject: Re: Damn it, how routine maintenance can spiral out of control   Sat Oct 13, 2018 1:55 pm

eeyore wrote:
motor-timothy wrote:
beetle wrote:
Hmm. Left looks like it could use a wee bit more. Have you adjusted the CO trim?


No I haven't. How much trim would you advise?

Quote :
Never torque the valve cover screws. They just need a firm hand tightening.

Lesson learned. Ordered a 4mm left rotating drill, hopefully that will get it out as I doubt it will be very tight. If I screw that up it will become more complicated.
Thankfully the valve cover is not directly screwed onto the cylinder but on the valve housing.

Good luck with the extraction. Have you tried to rotate the broken bit with a small screwdriver or similar.
If you need to drill dont forget to mask the area to prevent swarf falling into the oily bits.

I'm considering removing the rocker arm support before drilling. I got a tip to use superglue on a screwdriver to help it grab onto the bolt remnant, so I'll try that tomorrow. Drilling will be last resort obviously.
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