OEM Standard Piston Assembly with Alfin Steel Insert and 115 mm Bore for ISUZU 6HH1 Engine with Oil Gallery Cooling

The Standard Piston Assembly with OEM reference numbers 8-94391598-0 and 8943915980 is a verified direct-fit replacement for the ISUZU 6HH1 diesel engine, widely used in ISUZU FRR series trucks as well as FVR, FTR, and FSR models.

Primary Applications (ISUZU 6HH1 Engine):

When to Replace:

• Loss of compression or reduced engine power
• Excessive oil consumption or blue smoke from exhaust
• Blow-by (excessive crankcase pressure)
• Knocking or unusual engine noises
• During complete engine overhaul or rebuild
• Visible piston damage (scoring, cracks, or ring groove wear)

Installation Guidelines (Reference ISUZU workshop manual for complete steps):

1. Safety first — allow engine to cool completely before starting work
2. Drain engine oil and coolant
3. Remove the cylinder head and oil pan
4. Remove the connecting rod caps and push pistons out from the top
5. Inspect the cylinder bores for wear, scoring, or damage
6. Measure the cylinder bore to verify proper piston-to-bore clearance (0.02-0.05 mm factory specification)
7. Compare the new piston with the old unit — verify part number (8-94391598-0) and dimensions (115mm bore, 106.5mm height) match
8. Install new piston rings (sold separately — ISUZU 6HH1 piston ring set) — ensure proper ring gap and orientation
9. Lubricate the piston and cylinder bore with clean engine oil
10. Install the piston with a ring compressor — ensure correct orientation (notch or arrow toward front of engine)
11. Connect the connecting rod to the crankshaft and torque bolts to manufacturer specification
12. Reassemble all components, refill with fresh oil and coolant
13. Start engine and perform break-in procedure

Pro Tips:

• Always replace piston rings when replacing pistons — ensure proper sealing and compression
• Have the cylinder bores measured and honed if necessary
• Use only high-quality engine oil and filters to protect new pistons
• Follow the manufacturer's break-in procedure for new pistons and rings
• This piston is also available as part of a complete liner kit including pistons, piston rings, and cylinder liners

• Individually sealed in protective packaging
• Available as single piston or as a complete set of 6
• Packed in neutral packaging or carton
• Single unit weight: 1.35 kg
• Set weight (6 pieces): Approx. 8.1 kg
• Bulk wholesale available in master cartons
• Suitable for: ISUZU specialist repair shops, commercial vehicle maintenance depots, engine rebuilders, auto parts distributors