10,000 oph 20,000 oph 30,000 oph up to 40,000 oph*1,2


repeated at 40,000 oph


repeated at 50,000 oph


60,000 oph 60,000 oph


repeated at 70,000 oph


up to 80,000 oph*1,2 80,000 oph


Service


Maintenance schedule and downtimes


Maintenance schedules for natural gas applications (and applications where gas quality is similar to natural gas, such as biomass digestion, flare gas) are structured as follows, with small variations depending on engine type.


Maintenance scope


Valve clearance, ignition check, filter change, change pre-chamber gas valves every 2,000 – 4,000 oph / 6,000 oph


Interval


Downtime estimate3)


every 2,000 – 4,000 oph 6,000 oph*


Type 2: 7 hrs Type 3: 9–11 hrs Type 4: 10–12 hrs Type 6: 11–16 hrs Type 9: 16–20 hrs


Change water pump, clean turbochargers, check / change starter


Type 2: 16–19 hrs Type 3: 24–28 hrs Type 4: 26–30 hrs Type 6: 40–48 hrs Type 9: 100–130 hrs


Overhaul turbocharger, overhaul alternator (change bearings), change vibration dampers, change elastic coupling


Minor overhaul -> change main engine components, such as pistons, cylinder liners, con rods, cam followers; check / change cylinder heads, camshaft, main bearings


Major overhaul -> see separate chapter


Type 2: 2–6 days Type 3: 3 days Type 4: 3–3.5 days Type 6: 4 days Type 9: 14–20 days


Type 2: 2–6 days Type 3: 5–7 days Type 4: 7–10 days Type 6: 12–19 days Type 9: 5–6 weeks


Regular overhaul 3–4 weeks using replacement program Special fast-turnaround programs available (downtime 1–2 weeks) Type 9: on-site Overhaul: 8–10 weeks


oph 10,000 20,000 30,000 40,000 50,000 60,000 70,000* 80,000* Maintenance event


With biogas (landfill, sewage gas) and special gas applications, minor overhauls are due every 20,000 operating hours. The J920 maintenance plan are for guidance only, depending on customers requirements.


* Maintenance events 1) Type J920, on-site overhaul, depends on engine condition 2) Type 3D version + 2C version 3) All data based on experience, without pre-work included, debriefing engine overhaul-downtimes


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