Complete Overhaul Guide for Jenbacher Engines

Preventive maintenance is a fundamental pillar for guaranteeing the good performance of a cogeneration plant. When a gas engine reaches the operating hours limit stipulated by the manufacturer, carrying out an Overhaul stops being a mere suggestion and becomes an essential action to prevent serious breakdowns and avoid unexpected interruptions in operation.

At RS Motor, we have extensive experience as specialists in technical maintenance and supply of spare parts for cogeneration engines. In this detailed guide, you will find everything necessary about the Overhaul of Jenbacher engines (Series 2, 3, 4, and 6), from recommended maintenance intervals to the different scope alternatives and the key components involved.

What is an Overhaul in a Jenbacher Cogeneration Engine?

An overhaul is a comprehensive maintenance process that restores the engine to its original factory specifications and tolerances, leaving it in conditions equivalent to “Zero-Hour” operation.

Unlike routine maintenance, this process involves the complete disassembly of the engine block, a detailed inspection of all its internal components and wear elements, either with original or OEM spare parts. Furthermore, at RS Motor, we offer the option of using components reconditioned by us. The goal is to extend the engine’s useful life, optimize performance, and ensure maximum availability at the lowest possible cost.

When is an Overhaul necessary? Maintenance Intervals

Jenbacher engines follow a strict maintenance plan based on operating hours. Although the exact schedule may vary depending on the gas quality (natural gas, biogas, landfill gas) and operating conditions, the most critical maintenance tasks are usually classified as follows:

1. Medium and large-scope maintenance (10,000, 20,000, 30,000, and 40,000 hours)

Scheduled maintenance aimed at ensuring the engine’s reliability and useful life, through the inspection and reconditioning of main components, without disassembling the crankshaft.

• Main actions: cylinder head replacement if necessary, turbocharger review, and inspection of gas mixer and jacket water pump.

2. Major Overhaul (Approx. 60,000 hours)

Known in the Jenbacher maintenance program as the 60k inspections. It is the total disassembly of the engine.

• Main actions: Crankshaft inspection, replacement of main and connecting rod bearings, cylinder liner change, pistons, and total reconditioning of the block.

RS Motor Tip: If your engine operates with aggressive special gases (such as biogas with high siloxane or hydrogen sulfide content), these intervals can be significantly shortened. Performing periodic oil analysis and borescopes is essential to anticipate issues.

The Step-by-Step Overhaul Process at RS Motor

Our technical knowledge allows us to carry out overhauls both in our own facilities (in-house) and directly in the field (field service). Taking recent interventions on equipment such as a Jenbacher J316GS as an example.

This is the standard work protocol we follow:

• Disassembly and integral cleaning: Complete dismantling of the engine and cleaning using chemical processes and ultrasonics.
• Inspection and Non-Destructive Testing (NDT): Detailed evaluation of the block, crankshaft, and camshaft, including dimensional tolerance control and detection of microcracks using magnetic particles and penetrant liquids.
• Machining and Reconditioning: Honing of housings, valve grinding, reconditioning of connecting rods (with replacement of bushings and bolts), in addition to intercooler and oil cooler maintenance.
• Assembly: Mounting in accordance with the manufacturer’s specifications, strictly respecting the established tightening torques.
• Testing (Test Run): Finally, functional tests are carried out to verify that parameters such as emissions, vibrations, and temperatures are maintained within the optimal operating values.

Critical Spare Parts Replaced during the Overhaul

As global spare parts suppliers, we guarantee the availability of both original and OEM parts. In a Major Overhaul (E60/E70), the main replacements and repairs include:

Exchange Program and Return Policy

To minimize your plant’s downtime, we offer an Exchange Program that allows the engine to be replaced quickly and efficiently.

Instead of waiting for the original equipment to be repaired, you directly install a reconditioned engine and keep the operation running.

1. Shortblock (Basic Scope)

It is the most cost-effective option if your engine peripherals are in good condition. It involves the replacement of the central engine block (“Core Engine”).

• Includes: Block de motor y cigüeñal reacondicionados/mecanizados, culatas remanufacturadas, bielas (nuevas en Tipo 6 o reacondicionadas), y repuestos 100% nuevos en cojinetes de bancada/biela, camisas, pistones, árbol de levas y amortiguador de vibraciones.
• Ideal para: Reducir costes reaprovechando tus propios turbocompresores, intercoolers y sistemas externos.

2. Longblock (Alcance Extendido)

A more complete solution that guarantees the performance of the aspiration and exhaust systems.

• Includes: Everything from the Shortblock PLUS vital peripherals: Turbocharger, Intercooler, Exhaust manifold, Ignition system, and Starter motor.
• Advantage: Minimizes the risks of failures in peripherals and usually includes performance tests (lubricación y estanqueidad).

How does it work?

• You receive a reconditioned engine ready to install.
• You replace your current engine without prolonged waits.
• You return the original engine to us later.

What is the advantage?

• Drastic reduction of downtime.
• Agile and simple process.
• Operational continuity without long interruptions.

Benefits of Trusting RS Motor with Your Overhaul

We compete directly with engine manufacturers by offering a more agile, customized, and cost-effective alternative:

• Custom Overhauls: As we recently did with a Series 3 engine (J316GS), we adapt to the exact specifications and requests of each client, reacondicionando u omitiendo periféricos según la necesidad real de la planta.
• Cost-Effective Alternative: We drastically reduce Overhaul costs compared to official dealerships thanks to our network of genuine spare parts or OEM (Original Equipment Manufacturer) spare parts (same quality, better price).
• Own Spare Parts Stock: We have wear parts for Jenbacher Type 2, 3, 4, and 6 in stock.
• Flexibilidad ante Imprevistos: If you have suffered an unexpected breakdown, we offer In-house repairs evaluando qué piezas recuperar y cuáles sustituir, brindando total transparencia de costes tras el despiece.
• Highly Qualified Technicians: Our team of Field Service engineers travels internationally with special tooling.

Frequently Asked Questions (FAQ)

How long does a complete Overhaul of a Jenbacher engine?

With our engine exchange program (Shortblock/Longblock), it is possible to considerably reduce downtime at the plant.

Is your Jenbacher engine approaching 30,000 or 60,000 operating hours? Don’t wait for an unexpected failure to occur. Contact the experts at RS Motor today to request a customized scope (Shortblock, Longblock, or Genset) or check the availability of our stock of exchange engines.