The manufacturer’s instructions should always be used as a guide in engine removal or installation. The following is a typical engine removal and installation procedure for a horizontally opposed engine:
1. Remove the propeller.
2. Release the cowl fasteners holding the top cowling, and remove the top cowlings.
3. Remove the screws at the rear of the top and bottom cowling assembly; remove the cowling and store out of the way. [Figure 1]
4. Disconnect the mechanical fuel pump inlet line.
5. Disconnect the battery leads, then the generator and starter leads.
6. If installed, remove the cylinder head temperature thermocouple.
7. Disconnect the oil pressure and manifold pressure lines.
8. Disconnect the oil return line.
9. Remove the bonding strap from the rear of the engine.
10. Disconnect the governor control cable from the governor.
11. Disconnect the tachometer cable from the rear of the engine.
12. Disconnect engine oil cooler hoses.
13. Disconnect the engine oil temperature lead.
14. Disconnect the engine breather line.
15. Remove the four carburetor mounting nuts and allow the carburetor and carburetor air box to hang by means of the attached engine controls.
16. Attach a hoist to the engine-lifting eye and relieve the tension on the mounts. [Figure 2]
17. Disconnect magneto P-leads.
Remove the cotter pin, nuts, washer, and front rubber mount from each bolt and remove the sleeve. Slide bolts out of attaching points. Swing engine free, being careful not to damage any attached parts, and remove rear rubber mounts, as shown in Figure 3.
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| Figure 3. Engine clear of mount |