Crack on valve seat

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Crack on valve seat

Postby chtijr » Tue Feb 11, 2020 3:49 pm

Hello everyboby

Is it serious doctor ??

https://www.dropbox.com/s/juinej321k6xuck/P1100250.JPG?dl=0

Thank you

JR

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Re: Crack on valve seat

Postby Mick D » Tue Feb 11, 2020 3:59 pm

Needs a transplant

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Re: Crack on valve seat

Postby 1608 » Tue Feb 11, 2020 4:25 pm

Lucky its not an iron head. Loose or cracked seats on alloy heads are, dare I say, not uncommon.

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Re: Crack on valve seat

Postby chtijr » Tue Feb 11, 2020 5:08 pm

1608 wrote:Lucky its not an iron head. Loose or cracked seats on alloy heads are, dare I say, not uncommon.


Thank you .

I dont know how many kilometers the bike have done with this existing crack in the eighties .

Perhaps a lot . The bike was not stopped for this problem but for an other .


However, if i put some acetone or gasoline with the only weight of the valve
ther is no leakage after 10 minutes .

Do you think there is a risk of more severe damage in case of i run the bike like this ?

Many thanks for your interest .

JR

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Re: Crack on valve seat

Postby GOLDSTAR » Wed Feb 12, 2020 8:18 am

get it replaced, even if only for peace of mind, kind regards

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Re: Crack on valve seat

Postby 1608 » Wed Feb 12, 2020 2:14 pm

As already said, get it changed for peace of mind. Especially as you have gone to the trouble of stripping the engine so far. There is a good chance that the seat might become looser and come adrift.
Also, when the head gets hot it probably already does come loose which will make it even sloppier in the head.etc etc.

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