7664292 / 7664761 , 76.64. 761 Spark Plugs

Biogas Spark Plug for Guascor SFGLD Engines

Siemens S 76.64.761 – Heavy-Duty Spark Plug for Biogas Applications

The Siemens S 76.64.761 biogas spark plug is specially engineered for Guascor SFGLD biogas engines and is also fully compatible with the Guascor SFGM engine series. This spark plug is designed to deliver stable ignition, high durability, and consistent combustion in demanding biogas operating conditions where fuel quality and LHV can fluctuate significantly.

Developed for industrial gas engines operating on biogas, syngas, and contaminated fuels, the 76.64.761 spark plug ensures reliable engine performance, reduced misfires, and extended service intervals.

Engine Compatibility

• Guascor SFGLD biogas engines

• Guascor SFGM series gas engines

• Suitable for variable-speed and fixed-speed applications

• Optimized for biogas with fluctuating methane content

Why Choose Siemens S 76.64.761 for Biogas Engines?

Biogas engines operate under harsher combustion conditions compared to natural gas engines. Variations in methane concentration, moisture, and contaminants require a spark plug specifically designed for biogas combustion.

Key Advantages:

• Reliable ignition with variable LHV biogas

• Enhanced resistance to fouling and contamination

• Stable combustion under lean-burn conditions

• Reduced risk of misfire and engine knock

• Longer service life in aggressive fuel environments

This makes 76.64.761 the recommended spark plug for SFGLD biogas engines operating in landfill gas, sewage gas, and agricultural biogas plants.

Spark Plug Replacement Interval Guide

Replacement intervals depend on engine speed, fuel type, and operating conditions. Always reference the highest operating speed when engines run at variable RPM.

Recommended Replacement Hours (Extract)

FG / FGLD Engines

• Natural Gas

  • 1500 rpm: 1,250 hrs

  • 1800 rpm: 1,000 hrs

• Biogas

  • 1500 rpm: 1,250 hrs

  • 1800 rpm: 1,000 hrs

SFGLD Engines

• Natural Gas

  • 1200 rpm: 4,500 hrs

  • 1500 rpm: 3,750 hrs

  • 1800 rpm: 3,000 hrs

• Biogas (*)

  • 1200 rpm: 1,250 hrs

  • 1500 rpm: 1,000 hrs

  • 1800 rpm: 1,000 hrs

HGM Engines

• Natural Gas / Biogas

  • 1200–1800 rpm: 3,500 hrs

SFGM Engines

• Natural Gas / Biogas

  • 1500–1800 rpm: 3,000 hrs

Important Fuel Condition Recommendations

• Biogas LHV variation >10%
  → Use 76.64.292 / Siemens S 76.64.761 spark plug

• Highly contaminated gas (H₂S, siloxanes, impurities)
  → Strongly recommended to use Siemens S 76.64.761

These conditions significantly reduce the life of standard spark plugs. The 76.64.761 is engineered to handle such environments reliably.

Designed for Biogas Reliability

The Siemens S 76.64.761 spark plug features:

• Optimized electrode design for biogas combustion

• Improved resistance to deposits and corrosion

• Stable ignition energy under fluctuating fuel quality

• Reduced maintenance frequency and downtime

This makes it an ideal choice for biogas power plants, CHP units, and renewable energy installations using Guascor engines.

Global Supply & Support

We supply:

• Genuine Siemens biogas spark plugs

• OEM-compatible alternatives

• Technical support for plug selection and replacement intervals

• Worldwide shipping with reliable stock availability