71-00-00 Page 71-9 Issued: April 1, 1997
CHART 7101. TROUBLESHOOTING (ENGINE) (cont)
TROUBLE Poor acceleration. Low fuel pressure. Fluctuating fuel pressure. CAUSE Idle mixture too lean. Incorrect fuel air mixture. Worn control linkage or restricted air cleaner. Ignition defective. Restricted flow. Air leakage in fuel pump pressure line. Fuel selector not to correct travel. Vapor in fuel lines. Fuel gauge line leak. REMEDY Readjust mixture. Service carburetor. Tighten loose connections; and/or service air cleaner. Check ignition cables, plugs, timing and magnetos. Check and flush fuel lines. Locate and correct. Adjust fuel selector control. Operate auxiliary pump till system clears. Purge gauge line and tighten connections.
71-00-00 Page 71-10 Issued: April 1, 1997
3F24
REMOVAL OF ENGINE. (Refer to Figure 71-1.)
1.
Make sure all electrical switches are turned off, and the battery ground wire is disconnected at the battery.
2.
Move the fuel selector to its off position.
3.
Remove the engine cowls. (Refer to Section 71-10-00.)
4.
Remove the propellers per instructions in Chapter 61. Make sure to cap or cover the end of the crankshaft.
— Note —
After disconnecting any fuel, oil, or vacuum lines, make sure they and their fittings are capped. To prevent any question arising at installation as to where certain lines or fixtures need to be connected, items should be “TAGGED” or identified before separation.
5.
Remove the positive and ground leads from the starter. Disconnect from the engine mount and move the leads clear of the engine.
6.
Remove the engine as follows:
A. Disconnect the primer system hose from the tee fitting at the rear of the engine, and tie it back out of the way of the engine.
B. Disconnect the throttle, mixture, and carburetor heat controls and make sure they will not interfere with removal. The carburetor can be removed if desired.
C. Disconnect the prop control cable from the governor and dismount the cable from the engine. Move the cable out of the way, so as not to interfere with engine removal.
D. Separate the fuel supply hose from the “L” fitting at the rear of the engine and make sure it is clear of the engine.
E. Remove the tubes from the intake drain valves, at the bottom of the engine.
F. Remove the ignition leads from the spark plugs, so they can be made clear of the engine mount. Tag and note the leads as to which cylinder they affect, unscrew the support clamps, and cut the tie raps retaining the leads to the engine mount. Remove the necessary grommets in the baffles and pull the leads back to the rear of the engine. The leads and distributor caps should be removed from the magnetos (making sure they are noted as to their installation), or coiled and wrapped so they can be tied to the back of the engine to keep them out of the way.
7.
The lines leading to the oil cooler circumvent the engine mount and must therefore be removed or one end of each unattached from its fitting at either the cooler or the filter. Whichever method is followed, make sure the open hoses and fittings are capped.
8.
Remove the “P” leads at the magnetos. Install a cap or protective cover over each of the distributor blocks openings.
9.
Disconnect the oil temperature lead at the top aft end of the engine and make sure it is clear of the engine at removal.
10.Unscrew the tachometer cable out of the back of the engine and move clear for removal.
71-00-00 Page 71-11 Issued: April 1, 1997
11.
Disconnect the vacuum lines from the pump. and if tied to any item being removed with the engine release the line.
12.
Disconnect the oil breather tube from the back of the engine and make sure it is held clear of the engine.
13.
Disconnect the alternator leads, their cable attachments and move them clear of the engine.
14.
If desired. drain the oil from the engine.
15.
Remove the lifting lugs from the left side of the nose gear well, just aft of the starter solenoids.
16.
Attach a half ton (minimum) hoist to the lifting lugs using a strap arrangement.,
17.
Check the engine for anything still attached that might be damaged at removal. Make sure all lines and fixtures are clear of the engine and the engine mount if attached to the engine.
18.
Up-load the hoist just enough to take the weight off the mounts and remove the four engine mount assemblies.
19.
If the hoist is the type that rolls, move the engine and hoist forward so the engine moves out of the engine mount. If the hoist is stationary or attached to an “overhead ham” carefully swing the engine forward out of the mount. Be careful not to damage any attached assemblies.
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