Cummins/Onan WC4-10S-5 — Preparation for Operation
Installation · Power unit
For the Cummins/Onan WC4-10S-5, from the Cummins/Onan service manual.
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Before you start
- Do not service the power unit with gasoline while it is in operation or while a radio transmitter is operating nearby.
Procedure
- Recheck all installation instructions have been complied with.
- Crank the engine over a few times with the hand crank to make sure pistons and generator move freely.
- Be sure the battery or batteries are well charged.
- Fill the crankcase with oil to the FULL level; use S.A.E. number per lowest temperature expected.
- Remove air cleaner winged nut, lift filter element, fill oil cup to level with same oil as crankcase (not diluted).
- Place a drop of oil in each ball joint of the governor-to-throttle and governor-to-Modutrol control rods.
- Close the drain cock at the bottom of the radiator and the drain cock on the cylinder block.
- Fill radiator to about 1 inch below filler neck with clean, alkali-free water; add anti-freeze if freezing.
- Fill the fuel tank with clean fresh gasoline and make sure the vent is open.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Crankcase oil capacity 4 quarts
- Cooling system capacity about 13 quarts
Source: Cummins/Onan service manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.