Question about Craftsman 17.5 hp 42 in. Deck Lawn Tractor - CA Model

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Undefined correct way to adjust valves

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Order new Rocker Cover gasket for your Engine Code located at top of motor nameplate)
Drain Oil. 3 pints SAE 30
Remove OHV rocker cover 4 bolts carefully and remove rocker cover and toss old gasket. Clean rocker cover with a clean rag and set aside. Fetch standard feeler guage which has a .003" and a .005" available.
Exaust valve .005" is the top one and Intake .003" is the bottom.
First check the gap between the rocker arm and valve tip.
If they need adjusting then you will need star driver to slightly loosen the center star screw then use a 10mm or 3\8 ( i think )
To slighty adjust the outter bolt until its almost tight to feeler guage then at same time while holding the outside bolt, tighten the stardrive center until tight. It will still pull it in a bit is why I say "almost tight".
You will need to reinstall new OHV rocker gasket around the rocker pan, set the top 2 bolts to help align and you might need to shift the rocker cover upward while bolt it down so the bottom edge is high enough onto motor. Do not over tighten. Aluminum is soft. You may use some "weakest" loc-tite product but I never do.

Posted on Jun 13, 2013

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Posted on Jan 02, 2017

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