2c-2 Chapter 2 Part C 3.QL V6 engine
Oil pump
Case-to-outer rotor clearance ............................
Rotor end clearance ....................................
Case-to-inner rotor clearance (maximum wear limit) ...........
Torque specifications
Rockerarmshaftbolts ..................................
Intake manifold nuts/bolts ...............................
Distributor drive adapter bolts ............................
Engine mounts (see illustration 21 .l)
Stopperbolts .......................................
Front insulator bolts ‘. .................................
Rear insulator-to-crossmember bolts .....................
Heat shield bolts .....................................
Transfer support bracket bolts ..........................
Exhaust manifold nuts ..................................
Exhaust manifold heat shield bolts ........................
Exhaust pipe-to-manifold bolts ............................
Crankshaft vibration damper-to-crankshaft bolt ...............
Camshaft sprocket bolt .................................
Timing belt cover bolts (see illustration 10.13)
A(M6X20) ........................................
B(M6X55) ........................................
C(M6X25) ........................................
D(M6XlO) ........................................
Timing belt tensioner locking nut or bolt ....................
Cylinder head bolt
Pick-ups ...........................................
Montero
IQQOandearlier
.........
. .........................
1991andiater.. ...................................
Flywheel/driveplate mounting bolts* .......................
Oil pan mounting bolts ..................................
Oil pump assembly mounting bolts ........................
Oil pump relief plug ....................................
Oil pick-up tube-to-pump bolts ............................
Oil pump cover bolts ...................................
Valvecoverbolts ......................................
‘Apply a thread locking compound to the threads prior to installation
1 General information
This Part of Chapter 2 is devoted to in-vehicle repair procedures for
the 3.OLV6 engine. All information concerning engine removal and instal-
lation and engine block and cylinder head overhaul can be found in Part
D of this Chapter.
The following repair procedures are based on the assumption that the
engine is installed in the vehicle. If the engine has been removed from the
vehicle and mounted on a stand, many of the steps outlined in this Part
of Chapter 2 wil1 not apply.
The Specifications included in this Part of Chapter 2 apply only to the
procedurescontained in this Part. Part Dof Chapter2 contains the Specifi-
cations necessary for cylinder head and engine block rebuilding.
The 60-degree V6 has a cast iron block and aluminum heads with a
camshaft in each head. The block has thin walled sections for light weight.
A “cradle frame” main bearing casting - the main bearing caps are cast
as a unit, with a bridge, or truss, connecting them -supports the cast duc-
tile iron crankshaft.
Both camshafts are driven off the crankshaft by a cog belt. A spring
loaded tensioner, adjusted by an eccentric type locknut, maintains belt
tension. Each camshaft actuates two valves per cylinder through hydrau-
lic lash adjusters and shaft-mounted forged aluminum rocker arms.
Each cast aluminum three-ring piston has two compression rings and
a three-piece oil control ring. The piston pins are pressed into forged steel
connecting rods. The flat-topped pistons produce a 8.85:1 compression
ratio.
The distributor (or crank angle sensor), which is mounted on the drive-
belt end of the front cylinder head, is driven by a helical gear on the cam-
0.004 to 0.007 inch
0.0015 to 0.0035 inch
0.006 inch
Ft-lbs (unless otherwise indicated)
I80 in-lbs
168 in-lbs
132 in-lbs
29
22
40
108 in-lbs
18
180 in-lbs
132 in-lbs
25
112
70
115 in-lbs
115 in-lbs
115 in-lbs
115 in-lbs
20
65 to 72
65 to 72
76 to 83
72 to 80
72 in-lbs
120 in-lbs
36
180 in-lbs
120 in-lbs
84 in-lbs
shaft. The water pump, which is bolted to the timing belt end of the block,
is driven off the crankshaft by a drivebelt and pulley. The gear type oil
pump is mounted in the oil pump case and attached to the timing belt cov-.
er. It is driven by the crankshaft.
From the oil pump, oil travels through the filter to the main oil gallery,
from which it IS routed eitherdirectly to the main bearings, crankshaft, con-
necting rod bearings and pistons and cylinder walls or to the cylinder
heads.
2
Repair operations possible with the engine in the vehicle
Many major reparroperations can be accomplished without removing
the engine from the vehicle.
Clean the engine compartment and the exterior of the engine with
some type of degreaserbefore any work is done. It will make the job easier
and help keep dirt out of the internal areas of the engine.
Depending on the components involved, it may be helpful to remove
the hood to improve access to the engine as repairs are performed (refer
to Chapter 11 if necessary). Cover the fenders to prevent damage to the
paint. Special pads are available, but an old bedspread or blanket will also
work.
If vacuum, exhaust, oil or coolant leaks develop, indicating a need for
gasket or seal replacement, the repairs can generally be made with the
engine in the vehicle. The intake and exhaust manifold gaskets, oil pan
gasket, camshaft and crankshaft oil seals and cylinder bead gaskets ares
all accessible with the engrne in place.
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