How is the clearance of a valve measured?
The clearance is measured by inserting the specified size feeler gauge between the end of the valve stem and the adjusting screw. You should feel a slight amount of drag when the feeler gauge is moved back-and-forth. 10. Once the gap has been set, hold the screw in position with a screwdriver and retighten the locknut.
What should the clearance be on an exhaust valve?
The top row says that this table is for the exhaust valves and that the target clearance is .010 inches, right in the middle of the desired range. The “clearance” column is the measured clearances obtained with the stepped go/no-go feeler gauges.
How to adjust the valve clearance in a shimmed engine?
Last week, we talked about the basic steps to adjust valves in an engine that uses shims under bucket tappets. To summarize, those steps are: With the engine dead cold, carefully measure the valve clearances with feeler gauges, and record them in a table. Rotate the engine to top dead center (TDC) and remove the camshafts.
How do you know when to replace a valve?
Step 3: Measure the thickness of the valve head, known as the valve head margin, using a caliper (part number 19199). Step 4: Examine the surfaces of the valve face and seat. An uneven wear pattern tells you it’s time to replace them or resurface the seat and replace the valve.
Can a 45 degree feeler be used to check valve clearance?
Most of the blades in the 45 degree feeler gauge pictured above are too big to be of any use in checking valve clearance on a motorcycle. The flat feeler usually has more blades and it usually has mostly the thinner blades which are the most useful in measuring valve clearances.
Where is the feeler gauge on a GY6 valve?
Loosen the tappet locking nut on the top of the tappet and turn the tappet out several turns. Sandwich the 0.004″ feeler gauge between the bottom of the tappet and the top of the valve. Tighten the tappet while moving the feeler gauge back and forth until you can feel a slight drag on the feeler. Then carefully re-tighten the locking nut.
Last week, we talked about the basic steps to adjust valves in an engine that uses shims under bucket tappets. To summarize, those steps are: With the engine dead cold, carefully measure the valve clearances with feeler gauges, and record them in a table. Rotate the engine to top dead center (TDC) and remove the camshafts.
The clearance is measured by inserting the specified size feeler gauge between the end of the valve stem and the adjusting screw. You should feel a slight amount of drag when the feeler gauge is moved back-and-forth. 10. Once the gap has been set, hold the screw in position with a screwdriver and retighten the locknut.