Connecting Rod Assembly 13201-78030 1320178030 For Toyota Dyna Toyoace Hino Dutro N04C N04CT 4.0L — OEM Verified Forged 40Cr Steel, Direct Fit

The Connecting Rod Assembly with OEM references 13201-78030 / 1320178030 is a verified direct-fit replacement for Toyota and Hino N04C / N04CT 4.0L diesel engines, widely used in Toyota Dyna, Toyoace, Coaster, and Hino Dutro 300 / Hino 300 commercial vehicles. This connecting rod is the critical link between the piston and the crankshaft, transmitting combustion force from the piston pin to the crankshaft journal and converting linear piston motion into rotational power.

Manufactured from forged 40Cr steel — a chromium-alloy steel known for its high fatigue strength and resistance to the cyclic tensile and compressive loads of diesel combustion — this rod features a serviceable small-end bushing for the full-floating piston pin, with an oil hole alignment requirement during installation to ensure proper lubrication. The reference 13201-78030 is the Toyota-side part number, while 13260-E0050 is the corresponding Hino-side number — both are treated as interchangeable for the N04C/N04CT platform in the aftermarket.

• OEM Cross-Reference Verified: 13201-78030 is cross-referenced to 13260-E0050, 13260-1461, 13260-78060, and S1326-01461 across multiple independent catalogs.
• Material Verified: Forged 40Cr steel — confirmed by multiple supplier technical listings for the N04C connecting rod assembly.
• Weight Verified: 1.72 kg per rod (reference weight, without bearings) — confirmed by an independent supplier listing for 13201-78030.
• Fitment Coverage Verified: Confirmed for Toyota Coaster (XZB4#, XZB5#) from 08.2004 to 07.2011 with N04C engine, Toyota Dyna / Toyoace (including 110HT, 125HT, 130HT), and Hino Dutro 300 / Hino 300 with N04CT engine.
• Bushing Part Number Verified: The small-end bushing is separately referenced as 9099973129 (Toyota) and S1327-21400 (Hino), with a 4-piece-per-engine quantity.
• Bolt Specification Reference Verified: Connecting rod bolt torque for the N04C-TF platform is documented in workshop manual data, with M14 and M12 bolt torque values referenced at 132 N·m (97 ft·lbf) and 97 N·m (72 ft·lbf) respectively. Always confirm the exact torque and bolt type (TTY vs. reusable) against the specific engine workshop manual.

• Deep metallic knocking from the engine block (rod knock): A worn large-end bearing or a stretched rod produces a heavy, rhythmic knock that intensifies under load and may diminish when the cylinder is disabled during diagnostics.
• Low oil pressure with metal debris in the oil: Bearing material suspended in the oil, often appearing as a glittering sheen, indicates rod bearing degradation — a documented failure path on high-mileage N04C engines.
• Excessive piston pin noise (double knock): A worn small-end bushing produces a sharp double-knock at idle and low speed, especially on cold start.
• Bent or stretched rod after hydrolock or overheating: A rod subjected to liquid ingress or thermal distortion may be bent beyond specification even without visible cracking. Rods should be measured for bend and twist during any major overhaul.
• Visible cracking at the rod cap or beam: Cracks in the forged beam or at the cap mating surface require immediate replacement — a fractured rod can exit the block and destroy the engine.
• Uneven bearing wear pattern: A bent or twisted rod produces an asymmetric bearing contact pattern, indicating the rod itself must be replaced, not just the bearings.

• N04C vs. N04CT: Both engine codes are covered by this connecting rod in the aftermarket. However, if the vehicle is a later N04C-TF or common-rail variant, verify the connecting rod part number against the engine serial number or original rod marking before ordering.
• Coaster XZB platform: The EPC data specifically confirms fitment for Coaster XZB46V and XZB4#/XZB5# from 2004 to 2011 with quantity 4 rods per vehicle. Other Coaster chassis may use the same or a superseded rod — confirm via VIN.
• Hino Dutro 300 / Hino 300: The N04CT engine in Hino-badged models uses the same rod family. Hino-side part number 13260-E0050 is the direct cross-reference.
• Dyna / Toyoace variants: 110HT, 125HT, and 130HT are all listed under this rod reference. For 4WD or heavy-duty variants, confirm the rod grade if a different load rating is specified.
• Rod bolts are typically torque-to-yield (TTY): Many diesel connecting rod bolts are designed to be replaced, not reused. Confirm bolt specification and replacement requirement at inquiry.

1. Confirm original rod dimensions and weight: Measure the removed rod's center-to-center length, large-end bore, small-end bushing bore, and weight (1.72 kg reference). Match the new rod to these values, and use a matched weight set across all four cylinders.
2. Check rod bend and twist: Even a new rod should be verified on a rod alignment fixture before installation. A bent rod will destroy the bearing and may damage the crankshaft.
3. Install or verify the small-end bushing: If the bushing requires replacement, press in the new bushing and align the oil hole with the rod oil path — the workshop manual specifies that a 6 mm diameter rod should penetrate the aligned oil holes. Ream/hone to the specified piston pin clearance.
4. Install bearings and lubricate: Seat the bearing shells in the rod and cap, ensuring the lock tangs engage the lock slots. Lubricate bearing surfaces and the crank journal with assembly lubricant.
5. Protect the crank journal: Use rod bolt guides or tape over the rod bolts during installation to prevent scratching the crankshaft journal.
6. Torque rod bolts correctly: Use new rod bolts where specified. Reference torque values from the N04C workshop manual include M14: 132 N·m (97 ft·lbf) and M12: 97 N·m (72 ft·lbf), but always confirm the exact specification, sequence, and bolt type (TTY vs. reusable) against the manual for your specific engine variant.
7. Check side clearance and oil clearance: Verify connecting rod side clearance on the crank journal and bearing oil clearance with plastigauge or micrometer measurement.
8. Verify piston pin fit: The pin should slide through the bushing with the specified clearance. A pin that is too tight will seize; one that is too loose will knock.
9. Rotate and re-check: After torquing all rods, rotate the crankshaft through two full turns and confirm smooth rotation with no binding or interference.

• Oil changes: Use the correct diesel engine oil and adhere to Toyota / Hino recommended intervals. Degraded oil accelerates rod bearing wear.
• Oil pressure monitoring: A drop in oil pressure or the appearance of a knock warrants immediate investigation.
• Overhaul inspection: At any major engine overhaul, measure rod bend/twist and inspect the small-end bushing and large-end bearing surfaces.
• Matched sets: When replacing rods, use a matched weight set (reference 1.72 kg each) across all cylinders to maintain engine balance.

• Standard packing: Neutral carton with protective wrapping; wooden pallet available for bulk export orders.
• Package contents: 1 × Connecting Rod Assembly (bearings, bushing, and rod bolts not included unless explicitly stated — confirm at inquiry).
• Set options: Single rod / matched set for one engine (4 pcs for N04C / N04CT) — specify at inquiry.
• Suitable for: Toyota / Hino engine rebuilders, Dyna / Toyoace / Coaster / Dutro fleet maintenance departments, commercial vehicle spare parts distributors, and export wholesalers serving Southeast Asia, the Middle East, Africa, and Latin America.
• Related parts available: Rod bearings, small-end bushings (9099973129 / S1327-21400), piston pins, rod bolts, piston kits, and complete N04C / N04CT overhaul kits.