TAKUMI S-R6A15 Spark Plug M18 X 1.5 Thread Size Generator Spark Plug / Pressure Washer Spark Plug
Quick Answer
Fits: MWM TCG 2016 V8 / V12 / V16 · MWM TCG 3016 · C-A-T CG 132 V8 / V12 / V16
Replaces: 1245-3562
Key specs: M18 x 1.5 · 26 mm reach · 0.3 mm gap · prechamber, 5-hole · resistor type
MOQ: 20 pcs
Product Overview
A dimensional drop-in for the original ignition position, with the thread, reach, seat and gap reproduced to the original specification.
On gas engines the plug is also a sealing element — it holds combustion pressure and must seat correctly against the head. Getting the thread pitch, reach and seat type right is what prevents compression leaks, thread damage and misfires that no amount of ignition tuning will cure.
This 5-hole prechamber plug is used on MWM TCG 2016 / TCG 3016 and C-A-T CG 132 units in biogas and natural gas CHP plants, including containerised packages.
Cost of ownership: the meaningful figure is cost per operating hour, not price per piece. A cheaper plug changed more often can cost more over a year than a longer-life one.
Technical Specifications
| TAKUMI Type | S-R6A15 |
| Thread Size | M18 x 1.5 |
| Reach | 26 mm |
| Hex Size | 22.2 mm (7/8") |
| Seat Type | Flat / Gasket |
| Spark Gap | 0.3 mm |
| Electrode Type | Prechamber, 5-hole |
| Cable Length | 540 mm |
| Shield Length | 278 mm |
| Resistor | Yes |
Compatibility & Cross Reference
| Engine family | Engine models | Replaces OEM part no. |
| MWM | 1245-3562 / 1245-3564 / 1245-3548 / 1234-3755 / 1234-3055 / 1234-4096 / 1231-9475 / 1234-2668 / 1234-3758 | TCG 2016 V8 / V12 / V16, TCG 3016 |
| C-A-T | 1245-3546 | CG 132 V8 / V12 / V16 |
| 2G | 32090-00017 | TCG 2016 based packages |
| Fuel / application: natural gas · biogas · landfill gas · continuous CHP duty | ||
Note: OEM numbers are listed for reference only. Please confirm fitment against your engine model and serial number before ordering — we are happy to check it for you.
Why This Plug Performs
| Design point | What it means on your plant |
| Matched heat range | Correct thermal balance for continuous duty — avoids both overheating and fouling at part load. |
| Monolithic resistor | Stable conductivity and suppressed ignition noise, protecting coil and control electronics. |
| Nickel-plated shell | Corrosion resistance in hot, humid or high-sulphur gas environments. |
| 95% alumina insulator | Withstands thermal shock during load changes without cracking. |
| Gauge-checked unit by unit | Spark gap and resistance verified before packing — no out-of-box surprises. |
Package Reference
Standard packaging options are shown below. We can also supply neutral (unbranded) packing or fully customized packaging to your own artwork, logo and carton specification.
Bulk carton packing
Palletised packing
Export crate — wrapped & strapped
Packing configuration (pieces per carton, carton dimensions and gross weight) can be adjusted to your handling and warehouse requirements — please advise your preference when ordering.
Packing, Delivery & Customization
| Packing | Various packing options available — see Package Reference above. |
| MOQ | 20 pcs per item |
| Lead time | Most items are held in stock for immediate shipment. If an item is out of stock, lead time is 30 days. |
| Payment | T/T and L/C, etc. — to be confirmed with your order. |
| OEM / ODM | Available: neutral (unbranded) plugs and boxes, your own brand and logo, custom packaging design. |
Production & Quality Control
Every TAKUMI plug comes off a vertically integrated line: precision grinding, laser welding, ceramic sintering and a full electrical test. Batch numbers are recorded for full traceability.
The stations below are the ones every production batch passes through — pressure and leakage, spark voltage analysis, ceramic high-voltage resistance, and an aging run. A plug only ships once it has cleared all four.
Pressure & leakage test
Spark voltage analysis
Ceramic high-voltage resistance test
Aging test
Quality is checked at the point of manufacture rather than at the point of complaint. That is what keeps behaviour consistent from the first plug of a set to the last.
Our production and quality system:
- Produced in ISO 9001 and IATF 16949 certified facilities.
- 100% tested before shipment — spark gap, resistance and seal checked unit by unit.
- Factory-direct supply chain, so specification consistency is maintained batch to batch.
FAQ
Q: How do I know it fits my engine?
A: Send us your engine model and serial number, or the OEM part number currently in the engine. We will cross-check it against our reference list and confirm before you order.
Q: Can you supply under our own brand?
A: Yes — unbranded, your brand/logo, or custom packaging. Minimum quantities apply for custom branding.
Q: What is the minimum order quantity?
A: 20 pcs per item.
Q: What if a plug fails?
A: We warrant our spark plugs against manufacturing defects for a limited period from delivery. Spark plugs are consumable items: the warranty does not cover normal wear, damage from incorrect installation, engine faults, fuel or gas quality problems, or use outside the specified application.
Q: Can I fit this without changing engine settings?
A: Yes. The S-R6A15 reproduces the original thread, reach, seat and gap, so it is a drop-in replacement. No ECU or ignition-parameter change is needed.
Get a Quote
Verify your thread size, reach and seat type against the specification table, or send us your engine details and we will do it for you.
TAKUMI JAPAN AUTO PARTS CO., LTD. | Takumi, a Symbol of Quality & Reliability!
Get in Touch
Have questions about our products or want to discuss a custom order? Our team is ready to help you.