Tech Tips!

by Jonathan Teraji

Cylinder Head Maintenance

Cylinder head inspection and repair is a normal part of any maintenance program. Carbon deposits rob horsepower. A warped head causes head gasket leaks and drastically reduces horsepower. When resurfacing be sure to use a figure eight pattern and rotate frequently.

Decarbon Head Carbon deposits should be eliminated periodically from the surface of the cylinder head. Use a rounded scraper (a popsicle stick works well), avoid damaging the spark plug threads and avoid scratching the aluminum. Glass beading with a fine compound also works very well.
Warpage Measure Head Warpage (limit: 0.02mm or 0.001in). Attach a straight edge (1) and a feeler gauge (2) on the head. If out of specification, surface.
Surfacing Head Surfacing the head. Place a 400~600 grit wet sandpaper on a surface plate and use a figure eight pattern. Rotate the head several times to avoid removing too much material from one side. You can make a cheap surface plate by purchasing a 1' square piece of 1/4" thick glass. We also prefer to use fine grade valve lapping compound (can get at auto parts store cheap) rather than sand paper.

That's it for this month, shoot me some E-mail if you have specific YSR questions and I'll do my best to answer them as time allows, and/or suggestions for topics in "Tech Tips!" Remember this page is for you!

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