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Cylinder Head Gasket thickness

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Cylinder Head Gasket thickness

PostAuthor: chefkoch » Thu Jan 10, 2019 6:44 pm

Hello,

I am rebuilding my 83' XV 750 engine since the rear cylinder head gasket gave up (see picture). Now I am wondering whether to get the original gasket with thickness of ~2.2mm or get one from eBay with thickness of ~2.5mm. I measured the notch for the gasket of my cylinder and it is also about 2.2mm. The gasket that was used also had 2.2mm. My thought is that the thicker gasket might sit more tight and can withstand more force. On the other hand I would have to push it down the difference of 0.3mm regarding the torque specs. Also heat transfer between cylinder and head might be a problem with a thicker gasket...

What do you think which one to get? Thanks for your help in advance.

Cheers
David

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chefkoch
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Re: Cylinder Head Gasket thickness

PostAuthor: nanno » Fri Jan 11, 2019 1:13 am

Greetings David,

the headgasket has been compressed, which is why you only measure 2.2mm, instead of 2.5. Basically pulling the head down until it sits flush with the cylinder is what you do, when torquing the whole lot down to 65NM in the last step. There shouldn't be a visible gap left.

Cheers,
Greg

P.S.: Schöne Grüße von Ösiland nach Trier!
http://viragotechforum.com/viewtopic.php?f=12&t=43227 - Nanno's accumulated findings (and blatant show-off) - infos on my TR1's, my performance and reliability mods and a bit of show-casing of the stainless steel exhausts I build

http://greasygreg.blogspot.co.at (My blog - Greasygreg.blogspot.co.at)
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Bike year & model: 1981 Yamaha TR1
1982 Yamaha TR1 Turbo
1977 XS 750 Sidecar
1984 XT500 4Valve (Austrian Tax saving edition)
1979 RD250/R5/DS7-hodgepodge (in bits)
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Re: Cylinder Head Gasket thickness

PostAuthor: chefkoch » Fri Jan 11, 2019 6:25 pm

Hey nanno,

thanks for the help! That makes sense :thanks:

Danke dir und Grüße zurück in die Berge ;)

David

chefkoch
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Re: Cylinder Head Gasket thickness

PostAuthor: nanno » Sat Jan 12, 2019 3:35 am

Most welcome!

You can risk some additional 10 to 15NM if it really won't go down all the way.

Sepp Koch over at www.tr1.de does some special headgaskets for the old models with specific thicknesses as the ones in gasket sets range from good to really rubbish...

Cheers,
Greg
http://viragotechforum.com/viewtopic.php?f=12&t=43227 - Nanno's accumulated findings (and blatant show-off) - infos on my TR1's, my performance and reliability mods and a bit of show-casing of the stainless steel exhausts I build

http://greasygreg.blogspot.co.at (My blog - Greasygreg.blogspot.co.at)
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Bike year & model: 1981 Yamaha TR1
1982 Yamaha TR1 Turbo
1977 XS 750 Sidecar
1984 XT500 4Valve (Austrian Tax saving edition)
1979 RD250/R5/DS7-hodgepodge (in bits)
Sex: Male



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