B4000 SE Cab Plus 2WD V6-4.0L OHV (1998)
5. Push a piston into a cylinder to the bottom of ring travel using a piston without rings. Refer to Specifications.
See: Specifications
NOTE: Cylinder bore must be within specification for taper and out-of-round to fit piston rings.
6. Measure the top piston ring end gap using the Feeler Gauge.
Piston Replacement Inspection
1. Select a piston size based on the cylinder bore.
NOTE: The cylinder bore must be within specifications for taper and out-of-round before fitting a piston.
2. Choose the piston with the proper paint color.
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Red-in the lower third of the size range.
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Blue-in the middle third of the size range.
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Yellow-in the upper third of the size range.
NOTE: For precision fit, new pistons are divided into three categories within each size range based on their relative position within the range.
A paint spot on the new pistons indicates the position within the size range.
Piston Clearance Inspection
1. Subtract the piston diameter from the cylinder bore diameter to find the piston-to-cylinder bore clearance.
Piston Ring Clearance Inspection
1. Inspect for a step in the grooves.