How do you determine the maximum allowed piston travel?

How do you determine the maximum allowed piston travel?

• A. Check Line 10 of the Blue Card for Maximum Piston travel; Subtract 1.5 inches.
• B. Consult the engine manual and add 1.5 inches.
• C. Measure piston travel and multiply by two.
• D. Subtract 1 inch from the current travel.

Answer: (A)

You determine the maximum allowed piston travel by using the specification on the Blue Card and applying the fixed offset. Look up the line that lists Maximum Piston Travel, then subtract 1.5 inches from that value. The subtraction reflects the required clearance or tolerance used in the procedure, giving you the true upper limit you must stay within during measurement or maintenance. This approach relies on the official card values rather than other methods. For context, the Blue Card provides precise tolerances and offsets for components, so following its line and adjustment ensures consistency and prevents interference or over-travel. Using the engine manual to add 1.5 inches would exceed the specified limit, measuring piston travel and multiplying by two isn’t how the limit is determined, and subtracting a different amount from the current travel doesn’t match the prescribed procedure.

You determine the maximum allowed piston travel by using the specification on the Blue Card and applying the fixed offset. Look up the line that lists Maximum Piston Travel, then subtract 1.5 inches from that value. The subtraction reflects the required clearance or tolerance used in the procedure, giving you the true upper limit you must stay within during measurement or maintenance. This approach relies on the official card values rather than other methods.

For context, the Blue Card provides precise tolerances and offsets for components, so following its line and adjustment ensures consistency and prevents interference or over-travel. Using the engine manual to add 1.5 inches would exceed the specified limit, measuring piston travel and multiplying by two isn’t how the limit is determined, and subtracting a different amount from the current travel doesn’t match the prescribed procedure.