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3964547 Ignition coil for Cummins Gas Engine (Spare part)
The 3964547 ignition coil is a direct replacement for Cummins natural gas engines including CGE8.3, 6CT, ISC, QSC, ISL, and QSL. It interchanges with 5310989, 3934684, 3608003, 3930027, and 3928263. RJT PARTS tests every coil before shipping, offers 12-month warranty, and delivers worldwide in 3–7 days by express. Not sure if it fits your engine? Send your engine model to info@rjtparts.com — we confirm within 24 hours.
3964547 Ignition Coil for Cummins CGE8.3 6CT ISL QSC Gas Engine | RJT PARTS
Product Overview
The 3964547 ignition coil delivers high-voltage current to the spark plugs in Cummins natural gas engines. It converts low-voltage battery power into the thousands of volts needed to ignite the air-fuel mixture inside each cylinder. This part fits a wide range of Cummins CNG and LNG engines, including the popular CGE8.3, 6CT, ISC, QSC, ISL, and QSL platforms.
RJT PARTS supplies this ignition coil as a direct replacement for the original Cummins unit. It matches the OEM electrical specifications and mounting dimensions, so you install it straight out of the box without modification. Every unit passes electrical testing before shipment.
Cross-Reference OEM Numbers
The 3964547 ignition coil supersedes and interchanges with the following Cummins part numbers. Any of these numbers point to the same physical product.
| OEM Number | Status | Notes |
|---|---|---|
| 3964547 | Current | Most commonly referenced number |
| 5310989 | Cross Reference | Latest version, replaces all older numbers |
| 3934684 | Cross Reference | Older revision |
| 3608003 | Cross Reference | Early version |
| 3930027 | Cross Reference | Early version |
| 3928263 | Cross Reference | Original release number |
Important: All six numbers are interchangeable. When you order any one of them, you receive the same ignition coil. 5310989 is the newest supersession.
Compatible Cummins Engine Models
| Engine Series | Common Models | Fuel Type | Cylinders | Coils per Engine |
|---|---|---|---|---|
| CGE8.3 | CGE8.3, 6C8.3 Natural Gas | CNG / LNG | 6 | 6 |
| 6CT | 6CT Gas, 6CTA8.3-G | CNG / LNG | 6 | 6 |
| ISC | ISC8.3 Gas, ISC300 | CNG / LNG | 6 | 6 |
| QSC | QSC8.3 Gas, QSC300 | CNG / LNG | 6 | 6 |
| ISL | ISL8.9 Gas, ISL G280 | CNG / LNG | 6 | 6 |
| QSL | QSL9 Gas, QSL300 | CNG / LNG | 6 | 6 |
Note: This ignition coil fits natural gas engines only. It does not fit diesel engines. Diesel engines use glow plugs or compression ignition and do not require ignition coils.
Technical Specifications
| Parameter | Value |
|---|---|
| Part Name | Ignition Coil / Coil Pack |
| OEM Number | 3964547 (cross: 5310989, 3934684, 3608003, 3930027, 3928263) |
| Engine Type | Cummins Natural Gas (CNG / LNG) |
| Compatible Series | CGE8.3, 6CT, ISC, QSC, ISL, QSL |
| Input Voltage | 12V DC |
| Output Voltage | High voltage (spark generation) |
| Mounting Type | Bolt-on, direct fit |
| Connector | OEM-spec electrical connector |
| Quantity per Engine | 6 pieces (one per cylinder) |
| Condition | New |
| Warranty | 12 months |
| Packaging | Neutral box / RJT PARTS branded box |
Key Features
- Direct OEM replacement. Matches Cummins original mounting points and electrical connector. No wiring changes needed.
- Consistent spark output. Maintains stable voltage across the full RPM range, from idle to full load.
- Heat-resistant housing. Withstands the high under-hood temperatures common in gas engine compartments.
- Pre-tested units. Every coil passes insulation resistance and spark output testing before it leaves our warehouse.
- Cost-effective alternative. Delivers OEM-level performance at a lower price than the Cummins dealer channel.
When to Replace the Ignition Coil
Ignition coils wear out over time. Watch for these common failure symptoms:
- Engine misfires or runs rough under load
- Loss of power or poor acceleration
- Increased fuel consumption
- Check engine light with misfire codes (P0300–P0306)
- Hard starting, especially in cold weather
- Visible cracks or burn marks on the coil housing
RJT PARTS recommends replacing all six coils at the same time when one fails. Mismatched coil ages cause uneven spark performance and shorten the life of the newer units. We offer discounted 6-piece sets for complete engine service.
Installation Tips
- Disconnect the battery before starting work.
- Remove the engine cover and air intake components as needed.
- Unplug the electrical connector from the faulty coil.
- Remove the mounting bolt and pull the coil straight out.
- Compare the old coil with the new 3964547 unit to confirm matching dimensions.
- Apply a small amount of dielectric grease to the spark plug boot.
- Install the new coil and torque the mounting bolt to Cummins specification.
- Reconnect the electrical connector and battery.
- Clear any stored fault codes and start the engine to verify smooth operation.
Safety note: Natural gas engines operate under high pressure. Follow Cummins service manual procedures for gas line purging and lockout/tagout.
Why Buy from RJT PARTS
RJT PARTS specializes in diesel and gas engine replacement parts for the overseas aftermarket. We know Cummins engines inside and out. Here is what you get when you order the 3964547 ignition coil from us:
- Verified cross-references. We confirm every part number against Cummins catalogs before we ship.
- Ready stock. 3964547 and all its supersession numbers sit on our shelf and ship within 48 hours.
- Flexible order sizes. Order one coil for a repair job or a full carton of 50 for distribution. Both work.
- Bulk pricing. Discounts apply at 10 pieces, 50 pieces, and full carton quantities.
- Global shipping. DHL, FedEx, air freight, and sea freight — we choose the most cost-effective route for your order.
- Technical support. Send us your engine nameplate or old part number, and our team confirms the match within 24 hours.
Custom Product Attributes for Listing
| Attribute | Value |
|---|---|
| Supplier | RJT PARTS |
| Brand | RJT Aftermarket / OEM Compatible |
| Part Name | Ignition Coil |
| OEM Number | 3964547 |
| Cross Reference | 5310989, 3934684, 3608003, 3930027, 3928263 |
| Engine Make | Cummins |
| Engine Model | CGE8.3, 6CT, ISC, QSC, ISL, QSL |
| Fuel Type | Natural Gas (CNG / LNG) |
| Voltage | 12V |
| Quantity per Engine | 6 pcs |
| Condition | New |
| Warranty | 12 months |
| MOQ | 1 pc |
| Lead Time | 1–3 days (stock) / 15–30 days (bulk order) |
| Shipping | DHL / FedEx / Air / Sea |
| Payment | T/T, PayPal, Western Union, Trade Assurance |
FAQ
Q: Is 3964547 the same as 5310989?
A: Yes. 5310989 is the latest supersession number for 3964547. Both numbers refer to the same ignition coil. You can install either one.
Q: Does this ignition coil fit diesel engines?
A: No. This part fits Cummins natural gas engines only. Diesel engines use compression ignition and do not use ignition coils.
Q: How many ignition coils does a Cummins 6CT gas engine need?
A: Six coils — one per cylinder. RJT PARTS recommends replacing all six at once for balanced performance.
Q: Can I use this coil on a Cummins ISL G engine?
A: Yes. The 3964547 coil fits the ISL8.9 and ISL G-series natural gas engines.
Q: What is the warranty on this part?
A: RJT PARTS offers a 12-month warranty on all ignition coils. We replace any defective unit free of charge.
Q: Do you ship to my country?
A: Yes. We ship worldwide. Common destinations include Southeast Asia, the Middle East, Africa, South America, and Eastern Europe.
Q: Can I order just one piece?
A: Yes. Our MOQ is one piece. We also offer discounted pricing for quantity orders.
Q: How long does delivery take?
A: In-stock items ship within 48 hours. Express delivery (DHL/FedEx) takes 3–7 business days. Sea freight takes 25–40 days depending on the destination port.
Request a Quote
RJT PARTS stocks the 3964547 ignition coil and all its cross-reference numbers for immediate shipment. Whether you need one coil for a repair or a full carton for your parts store, we deliver competitive pricing and fast turnaround.
Send us your part number or engine model today. Our team replies within 24 hours with pricing, stock status, and shipping options.
