Evinrude E-TEC 15 HO / 25 / 30 hp service guide

Quick answers

What spark plug does an Evinrude E-TEC 15 HO / 25 / 30 hp use?

Champion QC10WEP (refer to the emission control information label). Gap: 0.028 ± 0.003 in (0.71 mm).

How often should an Evinrude E-TEC 15 HO / 25 / 30 hp be serviced?

The factory schedule lists: Every 300 hours or every three years. In Hawaiʻi's salt water we do a full yearly service every 200 hours or 1 year, whichever comes first, and a new engine needs its first (break-in) service.

When should the water pump impeller be replaced on an Evinrude E-TEC 15 HO / 25 / 30 hp?

The factory schedule says to inspect it at 300 hours. In Hawaiʻi's warm salt water we replace it every 200 hours or 1 year, whichever comes first, because a worn impeller is the most common cause of overheating.

What is the idle speed of an Evinrude E-TEC 15 HO / 25 / 30 hp?

In gear 750 ± 50 r/min; neutral 700 ± 50 r/min.

Maintenance specs

Gearcase capacity	11 fl oz (325 ml)
Gearcase level and drain/fill plugs	60 to 84 in·lb (7 to 9.5 N·m), new seals. Fill through the drain/fill hole until lube appears at the level hole.
Gearcase leak test (drained)	Pressure 3 to 6 psi (21 to 42 kPa), then 16 to 18 psi (110 to 124 kPa); vacuum 3 to 5 in Hg (76 to 127 mm), must hold minimum 15 in Hg (381 mm). Tools: pressure tester P/N 507977, vacuum tester P/N 507982.
Spark plug	Champion QC10WEP (refer to the emission control information label)
Spark plug gap	0.028 ± 0.003 in (0.71 mm)
Spark plug torque (indexed)	15 ft·lb (20 N·m). If the ink mark is in the shaded area, go up to 30 ft·lb (41 N·m) and no more to index the open side of the ground electrode toward the fuel injector.
Idle speed (EMM controlled)	In gear 750 ± 50 r/min; neutral 700 ± 50 r/min
Thermostat	Opens at 143 °F (62 °C); maximum temperature 212 °F (100 °C)

Service schedule

The factory maintenance intervals, with what is replaced and what is checked at each. Rows marked Hawaiʻi are our shop's yearly service for salt water use.

1. Every 200 hours or 1 year (our Hawai‘i yearly service) Hawai‘i

   Replace: fuel filter, oil filter, gear case oil, gear case plug gaskets, propeller cotter pin, water pump impeller

   Check: spark plugs, anodes

2. Every 300 hours or every three years

   Replace: fuel filter, oil filter, gear case oil, gear case plug gaskets, propeller cotter pin, water pump impeller

   Check: spark plugs, anodes

We replace the water pump impeller at every service from 200 hours up, which can be sooner than the factory schedule, because of Hawaiʻi’s warm salt water.

Source: Evinrude E-TEC 15 to 30 hp service manual. Specs can change by model year and serial number, so always confirm your exact model from the serial tag on the clamp bracket.