Otherwise, you’ll need to measure the thickness of your new gasket, then check with the manufacturer to find the compressed thickness. A head gasket with the proper thickness is required to ensure accurate clearance measurements. Avoid excessive amounts of clay on the edge of the piston to keep clay off the cylinder wall during measurement.Įach valve receives a light oil treatment to help keep the clay from sticking to the valve face as the crankshaft is rotated. Press a generous piece of clay into the two valve reliefs on top of the piston.
This is non-hardening clay that molds very easy when it's warm.īefore placing clay on the piston, apply a thin coating of either WD-40 or light engine oil on the cylinder wall to help keep the clay from sticking during the measurement process. Modeling clay can be purchased at a local craft store. After attaching the timing wheel and pointer, set true top dead center (TDC). A simple crank socket and ratchet can be used in place of the wheel for turning the engine over while using the clay method. The clay method doesn’t require a timing wheel, but we’re setting up in preparation for demonstrating the dial-indicator method. The valves are installed on the cylinder head for the corresponding cylinder using checking springs (more on those later). Make sure the cam is degreed for the intended setup as the cam position will affect piston-to-valve clearance. The short block is set up with the camshaft, timing set, crankshaft and at least the Number 1 piston and connecting rod with the proper bearings. Shown are the main tools needed to check piston-to-valve clearance: modeling clay, machinists scale, dial-indicator and base, timing wheel, pointer and checker springs.
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