Engine Overhaul-Disassembly Sequence; Internal Engine Components-Exploded View (Inline Six-Cylinder Engine) - Jeep cherokee 1989 Owner's Manual

t h e block. Other considerations are cost, access t o machine shop
facilities, parts availability, time required t o complete the project and the
extent of prior mechanical experience on the part of the do-it-yourselfer.
Some of the rebuilding alternatives include:
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Individual parts If the inspection procedures reveal that the engine
block and most engine components are in reusable condition, purchas-
ing individual parts may be the most economical alternative. The block,
crankshaft and pistonlconnecting rod assemblies should all be inspected
carefully. Even if the block shows little wear, the cylinder bores should
be surface honed.
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Short block A short block consists of an engine block with a crank-
shaft, camshaft and pistonlconnecting rod assemblies already installed.
All new bearings are incorporated and all clearances will be correct.
The existing valve train components, cylinder head(s) and external parts
can be bolted t o the short block w i t h little or no machine shop work
necessary.
Long block A long block consists of a short block plus an oil pump,
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oil pan, cylinder head(s), rocker arm cover(s) and valve train compo-
nents, timing sprockets and chain or gears and timing cover. All com-
ponents are installed w i t h new bearings, seals and gaskets incorporated
throughout. The installation of manifolds and external parts is all that's
necessary.
Give careful thought t o which alternative is best for you and discuss
the situation w i t h local automotive machine shops, auto parts dealers
and experienced rebuilders before ordering or purchasing replacement
parts.
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Engine overhaul disassembly sequence
7
Refer t o illustrations 7.3a, 7.3b, 7 . 3 ~ and 7.5
It's much easier t o disassemble and work on the engine if it's
mounted on a portable engine stand. A stand can often be rented quite
cheaply from an equipment rental yard. Before t h e engine is mounted
on a stand, the flywheelldriveplate should be removed from the engine.
The Motor Manual Guy
2
Chapter Part D General engine overhaul procedures
7 . 5 Internal engine components
2 Oil filter b y-pass plug
3 Build date code location
4 Ring set
5 Piston
6 Pin set
7 Plug
8 Engine block
9 Oil channel plug
1 0 Camshaft
11 Connecting rod
12 Pin
13 Camshaft sprocket
1 4 Keys
1 5 Washer
17 Oil shedder (slingerl
1 8 Crankshaft sprocket
1 9 Crankshaft
20 Connecting rod bearing
2 1 Connecting rod
bearing cap
2 If a stand isn't available, it's possible t o disassemble the engine
w i t h blocked up on the floor. €3; extra careful not t o tip or drop the
it
engine w h e n working without a stand.
3 If you're going t o obtain a rebuilt engine, all external components
must come off first (see illustrations), t o be transferred t o the replace-
ment engine, just as they will if you're doing a complete engine overhaul
yourself. These include:
Alternator and brackets
Emissions control components
Distributor, spark plug wires and spark plugs
Thermostat and housing cover
Water pump
Fuel injection components or carburetor
Oil filter
Engine mounts
Clutch and flywheel/driveplate
Engine rear plate
Note: When removing the external components from the engine, pay
close attention t o details that may be helpful or important during in-
stallation. Note the installed position o f gaskets, seals, spacers, pins,
brackets, washers, bolts and other small items.
4 If you're obtaining a short block, which consists of the engine
block, crankshaft, pistons and connecting rods all assembled, then the
cylinder head(s), oil pan and oil pump will have t o be removed as well.
See Engine rebuilding alternatives for additional information regarding
t h e different possibilities t o be considered.
5 If you're planning a complete overhaul, the engine must be disas-
sembled and the internal components (see illustration) removed in the
following order:
Rocker arm coverlsl
Intake and exhaust manifolds
Rocker arms and pushrods
Cylinder headls)
Valve lifters
Timing cover
Timing chain and sprockets
Camshaft
Oil pan
Oil pump
Crankshaft and main bearings
2D-7
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exploded view
Main bearings
Vibration damper pulley
Washer
Vibration damper
Seal
Gasket
Main bearing cap (rear)
Main bearing cap seal
kit (rear)
Pilot bushing [with
manual transmission)
Bushing oil wick (with
manual transmission)
Flywheel and ring gear
(with manual transmission)
Bearing set
Dowel
Plug