HINO Flywheel: Specs, Compatibility & OEM Numbers

A practical buying guide for HINO trucks. Covers EF750, EK100, EH700, EP100, E13C and F-series flywheels with specs, ring gear tooth counts, truck model compatibility, OEM reference patterns, and what to check before you quote.

Why HINO Flywheels Are a Common Replacement Part

HINO trucks have a long service life. Many fleets in Southeast Asia, the Middle East, Africa and Latin America still operate 10–20 year old HINO heavy-duty models such as the Ranger, Super Dolphin, Profia, and 500 series. The engines behind these trucks, including E13C, EF750, EK100, EH700, EP100 and F17D, share one trait: the flywheel is a wear item that has to be replaced at least once during the truck’s working life.

The most common reasons a HINO flywheel gets replaced:

• Worn ring gear teeth from cranking wear, often after 80,000–120,000 starts
• Clutch refurbishment on a truck that has run 250,000+ km
• Cracked web section from heat cycling or starter motor pinion impact
• Flywheel machining (refacing) reaching its minimum thickness limit
• Conversion from manual to automated manual transmission (AMT) on certain fleet refits

For distributors and importers, this makes HINO a steady aftermarket part with predictable demand. For one-off buyers, it makes finding the right replacement a recurring headache, since each engine family uses a different flywheel with its own tooth count, bolt pattern, weight and OEM reference.

Core Specs That Matter for a HINO Flywheel

Before you contact any supplier, get these four specs from your existing flywheel or from the engine plate:

• Outer diameter (mm) drives torque capacity and starter ring fit
• Ring gear tooth count must match the starter motor pinion (typical HINO counts: 129T, 130T, 136T, 142T)
• Bolt circle / pilot bore / bolt count ensures it bolts to the crankshaft flange
• Weight (kg) matters for balancing and shipping cost

Two HINO flywheels with the same tooth count are not automatically interchangeable. The crank pilot, bolt pattern, and friction-face thickness differ between E-series, F-series and older EH/EK families. Always cross-check before quoting.

HINO Flywheel Compatibility by Engine Family

HINO has shipped dozens of engine families over five decades. The most commonly replaced flywheels in the aftermarket fall into three buckets:

Medium-duty (legacy, 6–10 ton class)

Heavy-duty (12 ton and above)

New generation (current production)

For the widest range of HINO flywheels in stock, look for suppliers who can cover both legacy and current-generation engines. Most aftermarket demand sits in the legacy bucket because that is what older trucks still on the road actually need.

OEM Reference Numbers for Popular HINO Flywheels

HINO OEM part numbers typically follow the format 31160-XXXXXX or 31250-XXXXXX for the flywheel assembly, with the ring gear carrying its own reference. The exact 6-digit suffix varies by engine serial range and production year, which is why quoting requires your engine serial number or an existing sample.

The table below is a reference pattern, not a guaranteed cross-reference. Always confirm against the part number stamped on your existing flywheel or on the engine data plate.

Suffix digits differ by serial range. Provide your engine plate number or sample flywheel when you request a quote, and we will confirm the exact reference before production.

For engine families not listed above (J05E, J08E, P11C, A05C, F20C, F21C), the same logic applies — supply the OEM reference from your existing part or the engine plate, and we will match against our catalog or build a sample for verification.

How to Identify the Correct HINO Flywheel Before Quoting

Three reliable methods, in order of accuracy:

1. Read the OEM stamp on the existing flywheel. Almost every HINO flywheel has its part number laser-etched or stamped on the web face, usually near the ring gear. Photograph it before sending your enquiry. This is the fastest and most accurate route.

2. Read the engine data plate. Mounted on the engine block, usually on the valve cover or timing case. It carries the engine model and serial number. Combined with the truck model and production year, we can identify the correct flywheel in our catalog.

3. Measure the four key specs. If neither stamp is readable (often the case on used 15-year-old trucks), measure:

• Ring gear tooth count
• Outer diameter
• Pilot bore diameter
• Bolt circle and bolt count on the crank flange

Send these four numbers plus a clear photo of the flywheel face. We will cross-check against our database and either confirm a catalog match or recommend a sample build for verification.

Common Failure Signs on HINO Trucks

These are the symptoms that push a HINO truck owner to replace the flywheel rather than just the clutch:

• Grinding noise on startup, especially cold — worn ring gear or starter pinion
• Clutch judder or vibration at idle that does not go away after a clutch replacement — usually means the flywheel friction surface is glazed or has hot-spots
• Visible cracks on the web between the bolt circle and the friction face
• Starter motor spins without engaging the ring gear — chipped or broken tooth on the flywheel
• Excessive oil contamination on the friction face — rear main seal leak or clutch slave cylinder leak that has degraded the surface

Replacement is almost always combined with a new clutch kit, rear main seal and pilot bearing. It makes sense to replace all wear items in one service to avoid repeat labor.

Price and MOQ Reference for HINO Flywheels

Pricing varies by engine family, ring gear option (machined only vs full ring gear installed), and order quantity. The reference ranges below are based on typical FOB Qingdao pricing for a sample order of 20 pieces:

Ring gears are usually sold separately and can be either machined and fitted at the factory or shipped loose for customer fitting. FOB Qingdao is the standard Incoterm for export orders; CIF and DDP can be quoted on request for buyers who prefer landed cost.

For high-volume contracts (annual commitment of 500+ pieces), pricing drops significantly under a scheduled production agreement. Tell us your annual forecast and we will prepare a tiered quote.

OEM vs Aftermarket HINO Flywheels: What Buyers Should Know

The genuine HINO flywheel is built by HINO’s licensed supply chain and carries the OEM reference. Aftermarket equivalents are built by independent foundries to the same drawing but typically without the HINO stamp. Here is what actually differs in practice:

For most fleet operators and distributors, the aftermarket route is the right balance of cost, availability and warranty, provided the supplier can document material spec, dynamic balance report and dimensional inspection for each batch.

Sourcing HINO Flywheels from China: Practical Tips

If you are importing HINO flywheels from China for resale or fleet maintenance, keep these in mind:

• Ask for a sample build first if your target part is not in the supplier’s standard catalog. Tooling and pattern cost for legacy HINO flywheels is usually modest because the castings are well documented.
• Demand a dimensional inspection report with each shipment. The four critical measurements are outer diameter, bolt circle, pilot bore, and ring gear tooth count.
• Check the dynamic balance grade. G6.3 is the minimum standard; anything looser will create vibration issues.
• Specify packaging. Flywheels are heavy and the ring gear is fragile. Wood crate with foam bracing is the standard. Avoid stacking more than four per pallet.
• Plan spare ring gears. Ring gear failure is more common than flywheel failure. Stocking 5–10% spares prevents a single bad batch from sidelining a truck.

For buyers outside China, FOB Qingdao is the most common Incoterm. Shipping from Qingdao to Bangkok, Jakarta, Lagos, Dubai, Lima and Ho Chi Minh takes 18–30 days by sea depending on route.

Published by Changwei Intelligent Equipment. IATF 16949 certified foundry producing replacement flywheels for HINO, ISUZU, FUSO, Toyota and other commercial vehicle brands.