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Yamaha Tech Originally the Yamaha XT600 Tech Forum, due to demand it now includes all Yamaha's technical / mechanical / repair / preparation questions.
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  #1  
Old 19 May 2019
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Screwed up




Wanted to remove a dowl pin so used my vice grip to rotate it lose. Well apparently a hard, sharp edge of the vice grip was touching the head surface and it produced quite a scratch. Possible the worst location to do this

How screwed am I? I just re-did the entire head, lapsed the valves etc.

Maybe the head gasket + a little gasket sealant will prevent a leak?
Won't be able to do a pressure test for a while...

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  #2  
Old 19 May 2019
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If you wanted to be super cautious you could get it skimmed but I would put it back together using just the head gasket and see what happens, you will be surprised at what you can get away with sometimes.
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  #3  
Old 20 May 2019
dzl dzl is offline
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I did similar on the face between head/ rocker cover although was deeper than yours. Used some JB weld to fill gouge and has been ok and sealing well. I would clean any protrusions with a smooth file. Maybe some JB weld if it is deep enough but it does look very shallow. The gouge looks deepest where it doesnt really matter anyway?
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Old 20 May 2019
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Quote:
Originally Posted by dzl View Post
I did similar on the face between head/ rocker cover although was deeper than yours. Used some JB weld to fill gouge and has been ok and sealing well. I would clean any protrusions with a smooth file. Maybe some JB weld if it is deep enough but it does look very shallow. The gouge looks deepest where it doesnt really matter anyway?
Except, unlike the head/rocker, the part where I scratched is the barrel/head which is responsible for keeping all piston compression .

My only luck is that it isn't all the way till the end, but only just. Won't know until engine is in the bike and I can do a compression test.
Don't think it's deep enough for JB weld but there's definitely a small groove that is very noticeable with the finger.
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  #5  
Old 20 May 2019
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the only sealant that can be used in the head is cooper paste/spray,


dont even think about silicons or anaerobic sealant, nothing will stand the heat


but cant see the problem to remove the valves and do a minimal skim, just note down where each valve is.... not costly either.
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  #6  
Old 20 May 2019
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Originally Posted by turboguzzi View Post
the only sealant that can be used in the head is cooper paste/spray,


dont even think about silicons or anaerobic sealant, nothing will stand the heat


but cant see the problem to remove the valves and do a minimal skim, just note down where each valve is.... not costly either.
Sealant I have is rated up to 250c.
All my local garages have waiting times unfortunately, and it will definitely be 30min-1hour so at least €50.
I think I'm gonna try my luck.
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