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Small holes on s80 cylinder head

Help, Advice, Owners' Discussion and DIY Tutorials on the Volvo S80 model. Sometimes called an "executive car", the S80 was and continues to be Volvo's top-of-the-line passenger car.
nathanepstein
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Small holes on s80 cylinder head

Post by nathanepstein » Sun May 20, 2018 12:06 pm

There are small holes on the top of my s80 cylinder head and was wondering if they are oil ports or just pockets. There is one for every valve (24). Should I worry about cleaning them out or are they unimportant?
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SuperHerman
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Re: Small holes on s80 cylinder head

Post by SuperHerman » Sun May 20, 2018 5:01 pm

I don't recall as working on this head is several years ago. Looking at the photo I would assume they are oil passages. Look for a clean one, take some carb or similar cleaner and insert the plastic pipe into it and spray. See where it comes out and what comes out. What does the other side of the valve cover look out - these may be oil passages to lube the upper cams. Do the same on the corresponding side of the valve cover - if they are oil passages you need those clean. You can spray and use a small wire, copper, and clean them out. If you have a carb wire set, use that. While spraying, be careful of back spray and your eyes.

They could be some exhaust emission passages - just don't remember. They still need to be cleaned out either way.

Head looks good though.

jimmy57
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Re: Small holes on s80 cylinder head

Post by jimmy57 » Sun May 20, 2018 7:41 pm

They are drilled to intersect he lifter bores. For either hydraulic or the solid buckets. If you look at top of head you will see the "ditch" cast into head to carry oil along the full length of head on intake and exhaust sides.

thebull
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Re: Small holes on s80 cylinder head

Post by thebull » Sun May 20, 2018 7:53 pm

Oil passages delivering oil to the tappets. Check your cover and you will see how they are matching with the oil canals there. Make sure that you spray compressed air in each hole to ensure there is no obstruction to the oil flow. The are very important holes.

Your pic is bringing some memories back 8) cheers
Flying on 2009 XC90 R-design 3.2L AWD and 2006 XC90 2.5T AWD. Volvo owner forever.

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