IN-VEHICLE SERVICE
Pistons and Connecting Rods
Removal
NOTE: If more than one piston (6108) is being removed, identify the piston and connecting rod cap
to the cylinder number. Caps are matched to connecting rods (6200) and are identified with matching
correlation letters as illustrated. Each component should be installed in its original position during
assembly.
1. NOTE: On 3.0L Aerostar it is necessary to remove the engine (6007) from the vehicle to
perform this procedure. Refer to Engine Assembly, Aerostar
, Removal and Installation in this
section.
Disconnect ground cable at battery and set aside.
2. Remove spark plugs and bring number 1 cylinder to top dead center of compression stroke.
3. Drain cooling system.
4. Perform all intake manifold removal steps as outlined in this section.
5. Remove cylinder heads (6049) as outlined in this section. If only one cylinder head is to be removed,
remove spark plugs (12405) from remaining cylinder head.
6. Remove oil pan (6675) as outlined in this section.
7. Loosen and remove retaining bolt and remove oil pump (6600) and oil pump intermediate shaft
(6A618).
8. Inspect the top of the cylinder bore(s) before removing the piston, pin and ring (6102) assembly. If a
ridge has formed at the top of the cylinder, it must be removed before piston extraction. Remove ridge
as follows:
a. Turn crankshaft (6303) until the piston and connecting rod to be removed is at the bottom of
the cylinder bore.
b. Place a clean shop cloth over the piston head to collect cuttings.
c. Remove ridge using a suitable ridge reamer following the manufacturer's instructions. Never
cut into the piston ring travel more than 0.794mm (1/32 inch) when removing the ridge.
9. Loosen connecting rod cap retaining nuts.
10. Rotate crankshaft to place piston and connecting rod assembly at bottom of its travel in bore.
11. Remove connecting rod nuts (6212) from cap. Place connecting rod nut so that they may be
reinstalled on the same rod bolt.
12.
CAUTION: Use extreme care to prevent scratching or nicking crankshaft journal.
Section 03-01B: Engine, 3.0L V-6 1997 Aerostar, Ranger Workshop Manual
file://C:\TSO\tsocache\VDTOM_5368\SVK~us~en~file=SVK31B30.HTM~gen~ref.HTM
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