Generac Power Systems 20, 30, 25 owner manual ‹ Changing Engine OIL, ‹ Spark Plugs

Standby Generator Sets

Maintenance

‹CHANGING ENGINE OIL

Refer to maintenance performed by service facilities for engine oil and filter change frequencies.

Drain the oil while the engine is still warm from run- ning. This means warm up the engine, shut it down and drain immediately as follows:

1.Remove OIL DRAIN HOSE from its retaining clip.

2.Loosen and remove OIL DRAIN HOSE CAP. Drain oil completely into suitable container.

3.When all oil has drained, install and tighten OIL DRAIN HOSE CAP, and re-install into its retaining clip.

4.Turn OIL FILTER (Figure 10.2) counterclockwise and remove. Properly dispose of old filter.

Figure 10.3 – Engine Air Cleaner

Air Cleaner

Figure 10.2 – Oil Filter

OIL

DIPSTICK

OIL

FILTER

5.Apply light coating of new engine oil to seal of new oil filter.-Install FILTER and tighten by hand only.

DO NOT OVER TIGHTEN.

6.Remove OIL FILL CAP. Add recommended oil (see

SPECIFICATIONS). DO NOT FILL ABOVE THE DIPSTICK “FULL” MARK. Crankcase oil capacity is 4.0 U.S. quarts (3.8 liters).

After refilling the crankcase with oil, always check oil level on dipstick. NEVER OPERATE ENGINE WITH OIL BELOW THE DIPSTICK “ADD” MARK.

7. Start engine and check for oil leaks.

(Doors Removed for Clarity)

‹SPARK PLUGS

Reset the spark plug gap or replace the spark plugs as necessary (Figure 10.4).

1.Clean the area around the base of the spark plugs to keep dirt and debris out of the engine. Clean by scraping or washing using a wire brush and commercial solvent. Do not blast the spark plugs to clean.

2.Remove the spark plugs and check the condition. Replace the spark plugs if worn or if reuse is questionable. See the “Service Schedule” section for recommended inspection.

3.Check the spark plug gap using a wire feeler gauge. Adjust the gap to 0.76 mm (0.030 inch) by carefully bending the ground electrode (Figure 10.4).

Figure 10.4 – Setting the Spark Plug Gap

SET PLUG GAP AT 0.76 mm

(0.030inch)

‹ CHANGING THE ENGINE AIR CLEANER ‹ COOLANT CHANGE

To replace the engine air cleaner, simply remove the air cleaner cover and replace the air filter making sure it is positioned properly before reattaching the cover (Figure 10.3).

See the “Service Schedule,” for air cleaner mainte- nance.

Every year, have a service facility drain, flush and refill the cooling system. See “Specifications” for cool- ing system recommendations.

10-3 06/07 D .Rev Maint011