Posted on October 8, 2023 by Jack BobCat E35 – CYLINDER HEAD – Valve Tappets Remove the valve tappets (Item 1) [Figure 60-80-34]. Measure the O.D. of the tappet [Figure 60-80-35]. Measure the ID of the tappet bore [Figure 60-80-35]. If the clearance exceeds the allowable limit, replace the tappets.