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

Compatibility & Cross Reference

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

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

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!