Pre-oil Procedures
[ 1 ] Pre-oiling with a Pressure Pot is the preferred method.
[ 2 ] When a Pressure Pot is not available, follow this alternate method.
Alternate Pre-oiling Method Geared Engines - GTSIO-520
• Prop hazard - remain clear of Propeller
• Prepare Airplane
Brakes - On Chocks - In Place Mags - Off Throttle and Fuel - Off Engine - Installed with Propeller Spark Plugs - Remove Bottom Plugs Oil - fill engine (10 Quarts) Oil Filter - Fill with oil before install [ Figure 1. ] [exception: 421C SN1405 & Up w/pump mounted filter]

Figure 1.	Figure 2.

• Oil Line

Fill the #10 oil line from oil filter to oil pump with engine oil during installation. [ Figure 2. ]

• Airplane

Prepare for motoring engine

• Establish Oil Pressure Indication

Master Switch - On Mags, Throttle, and Fuel - Off Starter - Engage [No more than 30 seconds with 3 minute cool down] Repeat as need Oil Pressure Gauge - Watch for first needle flicker indicating movement. Starter Switch - Off

• Normal Start

Prepare engine for normal start.

Note: Once in service, bleeding the oil line from the engine to the oil pressure gauge at the fitting will help the gauge show real time pressure much quicker. While running the engine, have an assistant catch the residual oil in a cup at the gauge end. Dispose of properly.