Engine Piston 13101-17010 1310117010 For TOYOTA 1HZ Land Cruiser HZJ75 HZJ80 Coaster Dyna — Verified OEM Direct Fit, 94mm STD Alfin Oil-Gallery Diesel Piston Set

The Engine Piston with OEM number 13101-17010 / 1310117010 is a verified direct-fit replacement for TOYOTA 1HZ (4.2L) and 1PZ (3.5L) diesel engines. This piston is a critical reciprocating component responsible for converting combustion pressure into crankshaft rotation and managing thermal load within the cylinder.

The 1HZ is a 4,164 cc water-cooled inline-6 OHV 12-valve indirect-injection diesel engine with a 94.0 mm bore and 100.0 mm stroke, widely used in TOYOTA Land Cruiser (70/80/105 series), Coaster, and Dyna models from 1990 through 2007.

The 1HZ engine is legendary for its reliability in harsh environments, making piston replacement a common service procedure during engine overhauls. This piston set is supplied in standard (STD) 94 mm size with Alfin insert and oil gallery for reliable performance in diesel engine rebuilds.

• Dimensional Verification: Piston diameter 94.00 mm, compression height 43.8 mm, total length 80.5 mm, pin size 29 × 65 mm, ring grooves 2.0K / 2.0 / 4.0 mm — verified against OEM drawing specifications for the 1HZ platform.
• Ring Groove Geometry: Ring grooves sized 2.0K mm (top, Keystone) / 2.0 mm (second) / 4.0 mm (oil control) — matched to OEM 1HZ piston ring specifications.
• Material & Construction: Manufactured from aluminum alloy with Alfin insert for ring-land reinforcement, oil gallery cooling channel, and tin coating for improved break-in characteristics and scuff resistance. Available in both Alfin and No-Alfin configurations depending on application requirements.
• OEM Cross-Reference Verified: Replaces 13101-17010, 13101-17010-01, 13101-17010-02, 1310117010, 13101-17100. International brand cross-references include 46257A STD (TEIKIN), 46257-STD (TEIKIN), 46257A050, PN-34131 (Autowelt).
• Multi-Platform Application: Confirmed compatible with TOYOTA Land Cruiser (HZJ75, HZJ78, HZJ79, HZJ80, HZJ81, HZJ105), Coaster (HZB30, HZB50), and Dyna models equipped with 1HZ/1PZ engines.

• Loss of engine compression: Worn or stuck piston rings reduce cranking pressure, causing hard starting and noticeable power loss under load.
• Excessive exhaust smoke (blue/white/black): Indicates oil passing rings or incomplete combustion — top-end refresh often resolves it.
• Increased oil consumption: Glazed bores or tired ring packs allow oil to enter the combustion chamber, raising operating costs.
• Piston scoring or scuffing: Visible skirt wear or liner wall scoring caused by thermal expansion, insufficient lubrication, or overheating — requires immediate replacement to prevent catastrophic engine failure.
• Knocking or tapping noise: Piston slap or bearing wear requires inspection before further engine operation.

• Confirm engine variant: 1HZ (4,164 cc, 6-cylinder) vs. 1PZ (3,469 cc, 5-cylinder). Both use this piston, but cylinder count differs — confirm correct quantity required (6 pcs for 1HZ, 5 pcs for 1PZ).
• Alfin vs. No-Alfin: This piston is available in both Alfin (ring-land reinforced) and No-Alfin configurations. The Alfin version is preferred for turbocharged or high-load applications; the No-Alfin version is standard for naturally aspirated engines.
• Verify piston-to-bore clearance and valve-to-piston clearance against the TOYOTA 1HZ workshop manual before installation.
• This piston is supplied in standard (STD) 94 mm size. Oversize options (+0.50 mm, +0.75 mm, +1.00 mm) may be required if cylinder liner wear exceeds OEM limits.
• Piston rings are not included unless specified — confirm package contents at inquiry. The piston set typically includes pin and circlips.
• Always verify OEM number against the engine tag or vehicle documentation before ordering.

Manufacturing conforms to ISO/TS16949 and ISO9002 quality management system standards. Each unit undergoes 100% quality inspection before packaging. Production adheres to GB1148-82, JB3931-85, and JB3932-85 piston standards.

1. Verify fitment: Confirm piston diameter (94.00 mm), compression height (43.8 mm), and ring groove dimensions (2.0K/2.0/4.0 mm) against removed OEM piston.
2. Check piston-to-bore clearance: Measure cylinder liner bore and piston skirt diameter; compare against manual specification.
3. Ring installation: Install rings with correct orientation (top ring marking up); stagger ring end gaps at 120° intervals.
4. Pin & clip installation: Lubricate pin bore and install piston pin (29 × 65 mm); secure with new circlips.
5. Connecting rod torque: Follow manual sequence — always confirm against the specific engine variant manual.
6. Liner protrusion: Verify liner protrusion meets specification before final assembly.

• Inspect compression and oil consumption at every 50,000 km or annually, whichever comes first.
• Replace piston rings and inspect pistons during any top-end overhaul.
• Monitor coolant condition and injection pump timing — the 1HZ indirect injection system is sensitive to fuel quality and pump calibration.
• Replace timing belt and tensioner according to TOYOTA service interval (typically every 100,000 km or 5 years).

• Standard packing: Neutral packaging / corrugated carton; 6 pcs in one set (for 6-cylinder 1HZ engine); wooden pallet available for bulk orders.
• Set options: Piston only, or piston set of 6 with pin & circlips — specify at inquiry. Rings available separately.
• Suitable for: Engine rebuild workshops, fleet maintenance departments, spare parts distributors, and export wholesalers.
• Related parts available: Piston ring set (2.0K+2.0+4.0 mm), cylinder liner kit (94.0 mm), piston pin (29 × 65 mm), circlips, and full 1HZ overhaul kit.