Specifications
| Fuel | Diesel |
|---|---|
| Emissions | 4 Final |
| Controller | LOFA |
| Oil capacity | 7.1 L |
| Voltage options | 12 V |
| Battery group | 24 |
| Battery cranking | 720 CCA |
| Battery voltage | 12 V |
| Battery quantity | 1 |
| Coolant capacity | 2.1 L |
Maintenance & consumables
| Item | Spec | Capacity | Part # | Interval | |
|---|---|---|---|---|---|
| Air filter | element | — | |||
| Fuel filter | — | ||||
| Oil filter | — | 250 hr | |||
| Battery | Inspect battery monthly and recharge or replace as needed. Inspect system every six months. | — | 2160 hr | ||
| Belt | — | 500 hr | |||
| Coolant filter | Coolant Drain Plug | — | |||
| Oil | Drain and refill oil every 500 hours or as needed. | — | 500 hr | ||
| Spark plug | — | 3000 hr |
Common questions
What kind of fuel does the Generac MIH1.2 run on?
The Generac MIH1.2 runs on Diesel.
Troubleshooting
6Symptoms & remedies
| Symptom | Cause | Remedy |
|---|---|---|
| Engine does not crank | Low battery output voltage or discharged battery. Loose or corroded connections. Faulty start circuit relay. Blown fuse. Faulty main switch or start safety switch. Faulty starter solenoid. Faulty starter. | Charge or replace batteries. See Battery Inspection. Clean and tighten connections. Contact a GMASD. Replace fuse. Repair switch as required. Replace solenoid. Replace starter. |
| Starter cranks slowly | Low battery output voltage or discharged battery. Excessive crankcase oil viscosity. | Charge or replace batteries. See Battery Inspection. Drain crankcase oil and replace with correct viscosity oil. See Draining and Refilling the Oil. |
| Hard to start, or does not start | Engine starting under load. Incorrect starting procedure. Restricted exhaust. No fuel. Air in fuel line. Poor fuel quality. Water, dirt, or air in fuel system. Fuel filter restricted or full of water. Dirty or faulty fuel injectors. Electronic fuel system failure. Cold weather. | Disengage PTO. Review starting procedure. See Pre-start Checklist and Engine and Heater Startup. Inspect and correct exhaust restriction. Check fuel tank. Purge fuel lines. See engine manual. Drain fuel and replace with proper grade and quality of fuel for operating condition. Drain, flush, fill, and purge fuel system. Replace fuel filter or drain water from fuel filter. Contact a GMASD. Use cold weather starting aids (see engine manual). |
| Engine misfiring or runs irregularly | Poor fuel quality; incorrect fuel/dirty fuel. Restricted fuel filter. Water, dirt, or air in fuel system. | Test fuel, drain water from fuel bowl. Replace fuel filter element. Drain, flush, fill, and purge fuel system. |
| Lack of engine power | Restricted air intake. Restricted exhaust. Poor fuel quality. Restricted fuel filter. Engine overloaded. Incorrect crankcase oil. Low coolant temperature. Incorrect valve clearance. Dirty or faulty fuel injectors. Air leak in engine intake or exhaust manifold. | Service air cleaner. Check and correct exhaust restriction. Drain fuel and replace with proper grade and quality of fuel for operating condition. Replace fuel filter elements. Reduce engine load. Drain crankcase oil and replace with correct viscosity oil. See Draining and Refilling the Oil. Remove and check thermostat. Adjust valve clearance or contact a GMASD. Check intake and exhaust manifold gaskets and manifolds; repair as required or contact a GMASD. |
| Engine idles poorly | Poor fuel quality. Electronic control system problem or basic engine problem. | Drain fuel and replace with proper grade and quality of fuel for operating condition. Contact a GMASD. |
Fault codes and symptom→remedy steps extracted from this model’s service/owner documentation; verify against the official manual before servicing. Full Generac MIH1.2 troubleshooting guide (42 entries) →
Available documents
Owner's manual — A0000244062 (Generac)