Jeep Zj Service Manual

2.5L 4-CYL - VIN [P]
1993 Jeep Cherokee

1993 CHRYSLER CORP. ENGINES
2.5L 4-Cylinder
Jeep:

Cherokee, Wrangler

ENGINE IDENTIFICATION
NOTE:

For engine repair procedures not covered in this article,
see ENGINE OVERHAUL PROCEDURES - GENERAL INFORMATION article
in the GENERAL INFORMATION section.

Engine can be identified by eighth character of Vehicle
Identification Number (VIN).The VIN is stamped on a plate attached to
top left corner of instrument panel.
Engine code is on a machined surface on right side of
cylinder block between cylinders No. 3 and 4. This code may be
required when ordering replacement parts.
ENGINE IDENTIFICATION CODES TABLE

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Application

2.5L 4-Cylinder PFI

VIN Code

....................................

P

                                                          
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Some engines are manufactured with oversize or undersize
components. These engines are identified by a letter code stamped on
oil filter boss near distributor. Letters are decoded as follows:
*
*

"B" indicates all cylinderbores .010" (.25 mm) oversize.
"C" indicates all camshaft bearing bores .010" (.25 mm)
oversize.
* "M" indicates all main bearing journals .010" (.25 mm)
undersize.
* "P" indicates one or more connecting rod journals .010" (.25
mm) undersize.
* "PM" indicates all crankshaft main bearing journals and one
or more connecting rod journals .010" (.25 mm) undersize.

ADJUSTMENTS
VALVE CLEARANCEADJUSTMENT
Engine is equipped with hydraulic valve lifters. No valve
adjustment is required.

REMOVAL & INSTALLATION
NOTE:

For reassembly reference, label all electrical connectors,
vacuum hoses and fuel lines before removal. Also place
mating marks on engine hood and other major assemblies
before removal.

CAUTION: When battery is disconnected, vehicle computer and memory
systemsmay lose memory data. Driveability problems may
exist until computer systems have completed a relearn
cycle. See COMPUTER RELEARN PROCEDURES article in GENERAL
INFORMATION before disconnecting battery.

FUEL PRESSURE RELEASE
CAUTION: Fuel system is under constant pressure. This pressure must
be released before disconnecting or servicing any fuel
supply or return system component. Wearproper eye
protection when releasing fuel system pressure.
Disconnect negative battery cable. Remove fuel filler cap.
Remove cap from pressure test port on fuel rail. See Fig. 1. Place
shop towels around pressure test port to absorb spilled fuel. Press
test port valve with a small screwdriver or punch wrapped in shop
towels. Remove shop towels and dispose of properly. Install pressure
test portcap.
CAUTION: Always replace "O" rings, spacers and retainers whenever
fuel system quick-connect fittings are disconnected. Ensure
fuel connections are secure by verifying that only retainer
tabs protrude from connectors, and by pulling on tubes to
verify that they are secure.

Fig. 1: Locating Fuel Pressure Bleeding Test Port
Courtesy of Chrysler Corp.

COOLING SYSTEM BLEEDINGCAUTION: Engine coolant may be hot. To avoid scalding, carefully

release system pressure before removing radiator cap or
drain cock.
Fill radiator completely and install pressure cap. Fill
reserve/overflow tank to FULL mark. Operate engine until it reaches
normal operating temperature. Shut off engine and allow it to cool.
Recheck coolant level in reserve/overflow tank as necessary. Add
coolantONLY when engine is cold.

ENGINE
Removal (Cherokee)
1) Remove battery and air cleaner. Remove hood. Drain cooling
system. Remove radiator hoses, coolant recovery hose and fan shroud.
Disconnect transmission fluid cooler lines (if equipped).
2) Discharge A/C system (if equipped). Discharge A/C system
using approved refrigerant...