Explorer Patriot 430, Service Manual

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Rocker Arm
Measure the cam rocker arm I.D., and wear or
damage, oil hole clogged?
Service Limit: Replace when it is more than
12.080 mm.
Rocker Arm Shaft
Measure the active O.D. of the cam rocker arm
shaft and cam rocker arm.
Service Limit: Replace when it is more than
11.936 mm.
Calculate the clearance between the rocker
arm shaft and the rocker arm.
Service Limit: Replace when it is less than
0.10mm.
Valve spring free length
Measure the free length of intake and exhaust
valve springs.
Service limit:
Inner spring 32.50 mm
Outer spring 36.00 mm
Valve stem
Check if valve stems are bend, crack or burn.
Check the operation condition of valve stem in
valve guide, and measure & record the valve
stem outer diameter.
Service Limit: IN: 4.90 mm
EX: 4.90 mm