Product Description
Piston & pin (.50mm)
Frequently Asked Questions
Q: What forklift engine models use piston and pin 00591-34657-81 (.50mm)?
A: This piston and pin assembly fits internal combustion engines found in forklifts from Crown, Toyota, Raymond, Hyster, and similar manufacturers. The .50mm oversize specification indicates this is a replacement for standard pistons that have been rebored. Verify bore size and engine displacement before ordering.
Q: What material is piston and pin 00591-34657-81 made from?
A: This piston is typically forged from aluminum alloy engineered for high heat and pressure resistance. The pin is hardened steel precision-fitted to the piston. Together they withstand combustion temperatures and compression forces in heavy-duty material handling applications.
Q: Why is the .50mm oversize specification important for 00591-34657-81?
A: The .50mm oversize indicates the cylinder bore has been rebored to that tolerance. Using an oversized piston in a standard-bore cylinder results in binding and catastrophic engine failure. Verify your cylinder bore measurement matches .50mm oversize before installation.
Q: How do I know if piston and pin 00591-34657-81 needs replacement?
A: Symptoms include loss of compression, excessive blow-by (oil mist from the dipstick), white smoke in the exhaust, rough idle, and power loss. If engine oil analysis shows high aluminum content, the piston is wearing excessively. Compression testing confirms piston or ring degradation.
Q: Are there cross-reference part numbers for piston and pin 00591-34657-81?
A: Cross-references vary by engine manufacturer and displacement. Provide your forklift model, engine serial number, and bore measurement for exact equivalent identification. We can match this piston to compatible engines across Crown, Toyota, Raymond, and other brands.