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J5700-3705060A Natural Gas Ignition Coil for YUCHAI Engine
Your Yuchai gas bus or truck misfires? The J5700-3705060A ignition coil fixes it. This direct-fit replacement matches OEM specs and installs in minutes. Fits Yuchai CNG/LNG engines in buses and trucks. In stock — ships within 48 hours. Email info@rjtparts.com or WhatsApp us for a quote.
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J5700-3705060A Ignition Coil for YUCHAI Natural Gas Engine | Bus & Truck | RJT PARTS
Product Overview
The J5700-3705060A ignition coil delivers high-voltage spark to the cylinders in Yuchai natural gas engines. It converts low-voltage battery current into the thousands of volts needed to fire the spark plugs cleanly under all operating conditions. This part serves bus and truck fleets running Yuchai CNG and LNG engines across developing markets.
RJT PARTS supplies the J5700-3705060A coil as a direct-fit aftermarket replacement. It matches the original Yuchai mounting footprint and electrical connector, so installation takes minutes on the cylinder head. Every coil passes bench testing for insulation resistance and spark output before we ship it.
The J5700 prefix appears across a range of Yuchai natural gas engine components, including fuel filters, throttles, and pressure regulators. Therefore, technicians familiar with Yuchai gas engines recognize this part number family immediately.
Cross-Reference Part Numbers
| Part Number | Suffix | Brand / Platform | Notes |
|---|---|---|---|
| J5700-3705060A | 3705060 | Yuchai | Primary number |
| J5700-3705060 | 3705060 | Yuchai | Earlier revision without “A” suffix |
| G3900-3705030 | 3705030 | Yuchai | Related coil family (YC6J/YC6M) |
| M2C00-3705061 | 3705061 | Yuchai | Related coil family (YC6MK/YC6L/YC6G) |
Important: Always confirm the suffix on your old coil. J5700-3705060A uses suffix 3705060. It may differ physically from 3705061 or 3705030 suffix coils. When in doubt, send us a photo of the old coil label and your engine nameplate.
Compatible Engine Applications
| Application | Common Engine Sizes | Vehicle Types | Fuel | Coils per Engine |
|---|---|---|---|---|
| Yuchai Natural Gas Buses | 6L–10L | City buses, coaches, school buses | CNG / LNG | 6 |
| Yuchai Natural Gas Trucks | 6L–10L | Medium and heavy trucks | CNG / LNG | 6 |
| Multi-brand Gas Engines | Various | Buses and trucks (some suppliers list FAWDE/Weichai compatibility) | CNG / LNG | 4 or 6 |
Common vehicle brands:
- Yutong, King Long, Golden Dragon, Higer, Ankai (buses)
- Dongfeng, Foton, Sinotruk, FAW (trucks)
Diesel engines do not use this part. This coil fits spark-ignited natural gas (CNG/LNG) engines only.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Name | Ignition Coil |
| OEM Number | J5700-3705060A |
| Cross References | J5700-3705060 |
| Engine Make | Yuchai (and compatible multi-brand gas applications) |
| Applications | Buses, trucks (CNG/LNG) |
| Input Voltage | 12V / 24V DC |
| Output Type | High-voltage spark |
| Mounting | Bolt-on, cylinder head mounted, one per cylinder |
| Connector | OEM-matching electrical plug |
| Quantity per Engine | 4 or 6 (depending on cylinder count) |
| Condition | New, aftermarket |
| Testing | 100% bench tested |
| Warranty | 12 months |
| Lead Time | 1–3 days (stock) |
Key Features
- Broad gas engine coverage. Fits multiple Yuchai natural gas platforms used in buses and trucks.
- Dual voltage support. Works with both 12V and 24V electrical systems.
- Heat-resistant construction. Epoxy-sealed housing handles high under-hood temperatures in stop-and-go bus duty.
- Direct fit. Matches OEM connector and mounting bolt pattern — no wiring modifications.
- Cost-effective. OEM-level performance at a lower aftermarket price point.
Failure Symptoms — When to Replace
- Engine misfire under load or at cruising speed
- Check engine light with misfire codes (P0300–P0306)
- Increased gas consumption (higher CNG/LNG usage)
- Rough idle or hesitation on acceleration
- Loss of power on gradients or with full loads
- Visible cracks, carbon tracking, or burn marks on the coil body
- Hard starting in cold weather
Fleet tip: Buses and trucks running constant routes put heavy stress on ignition components. Replace all coils during a major tune-up to avoid repeated roadside failures. RJT PARTS offers discounted 4-coil and 6-coil engine sets.
Installation Notes
- Disconnect the battery before starting work.
- Remove the engine cover and any intake piping blocking the coil pack.
- Unplug the electrical connector from the faulty J5700-3705060A coil.
- Remove the hold-down bolt and pull the coil straight off the spark plug.
- Compare the old coil with the new unit to confirm matching dimensions and connector orientation.
- Apply dielectric grease to the inside of the new coil boot before installation.
- Seat the new coil and torque the mounting bolt to factory specification.
- Reconnect the harness and battery. Clear fault codes and start the engine to verify smooth operation.
Follow service manual lockout/tagout procedures for natural gas fuel systems before servicing.
Why RJT PARTS
RJT PARTS supplies engine replacement parts to bus fleets, repair shops, and distributors worldwide. We know that downtime costs revenue, so we keep the J5700-3705060A coil and related gas engine consumables on the shelf.
- Verified fitment. We cross-check every order against part catalogs and engine serial numbers.
- Fast dispatch. In-stock orders leave our warehouse within 48 hours of payment.
- Flexible quantities. Order one coil for a repair or a full carton for fleet stock.
- Bulk discounts. Tiered pricing at 10, 50, and 100+ pieces.
- Worldwide shipping. DHL, FedEx, air freight, and sea freight to over 100 countries.
- Technical support. Send your engine nameplate or old part number — we confirm the match within 24 hours.
Custom Product Attributes
| Attribute | Value |
|---|---|
| Supplier | RJT PARTS |
| Part Name | Ignition Coil |
| OEM No. | J5700-3705060A |
| Cross Ref. | J5700-3705060 |
| Engine Brand | Yuchai (multi-brand compatible) |
| Applications | Buses, trucks (CNG/LNG) |
| Fuel Type | CNG / LNG (Natural Gas) |
| Voltage | 12V / 24V |
| Qty/Engine | 4 or 6 pcs |
| Condition | New Aftermarket |
| Warranty | 12 Months |
| MOQ | 1 pc |
| Shipping | DHL / FedEx / Air / Sea |
| Payment | T/T, PayPal, Western Union, Trade Assurance |
FAQ
Q: What does the “A” suffix mean in J5700-3705060A?
A: The “A” indicates a revised version of the original J5700-3705060 coil. It supersedes the non-A version and installs identically.
Q: Is J5700-3705060A the same as M2C00-3705061?
A: They belong to related but separate specification families. Always match the suffix on your original coil. J5700-3705060A uses suffix 3705060, while M2C00-3705061 uses suffix 3705061. Send us a photo if you are unsure.
Q: How many coils does my engine need?
A: Most Yuchai gas buses and trucks use 6-cylinder engines, so they need 6 coils. Some smaller 4-cylinder applications use 4 coils. Count the cylinders on your engine to confirm.
Q: Will this coil fit a diesel engine?
A: No. The J5700-3705060A fits natural gas (CNG/LNG) engines only. Diesel engines use compression ignition and do not require ignition coils.
Q: What is the warranty?
A: 12 months from the date of delivery. We replace any coil that fails due to manufacturing defects.
Q: Do you ship to my country?
A: Yes. We ship worldwide, including Southeast Asia, the Middle East, Africa, South America, and Eastern Europe.
Request a Quote
Need the J5700-3705060A ignition coil for a Yuchai gas bus or truck? RJT PARTS has it in stock and ready to ship. We also carry spark plugs, sensors, fuel filters, and other gas engine consumables for the same applications.
Send your part number, quantity, and destination country to info@rjtparts.com, or message us on WhatsApp for an instant quote. We reply within 24 hours.
📧 info@rjtparts.com
💬 WhatsApp: +86 178 8245 4252
