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5.2L Engine Specifications
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The 5.2L 318 CID eight cylinder engine is a V-type, lightweight, single cam, overhead valve engine with hydraulic roller tappets. This engine is designed to run on unleaded fuel with a minimum octane rating of 87.
Engine Type
318 cid 90' V-8 OHV 


[1997 curves]

1994 Engine Serial Number
X M 5.2L T YYYY XXXXXXXX

  • X=last digit of model year
  • M= Plant - Mound road
    • S- Saltillo
    • T - Trenton
    • K - Toluca
  • 5.2L=engine displacement
  • T=usage (truck)
  • YYYY=Month/Day
  • XXXXXXXX=8 digit serial no

2000-2001 Engine S/N
X M 318 YYYY XXXX

  • X=last digit of model year
  • M= Plant - Mound road
    • S- Saltillo
    • T - Trenton
    • K - Toluca
  • 318=engine displacement (CID)
  • YYYY= Month/Day
  • XXXX=Engine Serial Code

 

Bore & Stroke
3.91 x 3.31 in..(99.3 x 84.0 mm) 
Displacement
318 cu.in. (5.2 L) 
Compression Ratio 
9.1 :1 
Horsepower
230 hp @4400 rpm
Torque 
300 ft. lbs. (407 N.m) @ 3200 rpm 
Firing Order
1-8-4-3-6-5-7-2 
Lubrication
Pressure Feed - Full Flow Filtration
Engine Oil Capacity 
5.0 Qts. (4.7 L) with Filter 
Cooling System
Liquid Cooled - Forced Circulation 
Cooling Capacity
17.0 Qts. (16.1 L) 
Cylinder Block
Cast Iron 
Cylinder Head
Cast Iron 
Combustion Cambers 
Wedge - High Swirl Valve Shrouding 
Camshaft
Nodular Cast Iron 
Throttle Body Bore 50 mm
Pistons
Aluminum Alloy with Strut 
Spark Plugs: 14mm thread, 19mm reach, 16mm hex wrench, resistor
  Year   Manufacturer   Part No.   Stock Number Gap   Notes
1994-1996 NGK FR4 5155 .035  
1997-1999 NGK FR5-1 7252 .040  
Camshaft - Nodular Cast Iron
Bearing Number 1 2 3 4 5
Bearing Diameter mm 50.800 - 50.825 50.394 - 50.419 50.013 - 50.038 49.606 - 49.623 39.688 - 39.713
in 2.000-2.001 1.984-1.985 1.969-1.970 1.953-1.954 1.5625-1.5635
Journal Diameter mm 50.749-50.775 50.343-50.368 49.962-49.987 49.555-49.581 39.637-39.662
in 1.998-1.999 1.982-1.983 1.967-1.968 1.951-1.952 1.5605-1.5615

Diametrical Clearance:  0.0254-0.0762 mm,       0.001-0.003 in
Max Allowable:     0.127 mm,     0.005 in

End Play:                0.051-0.254 mm,     0.002-0.010 in
Connecting Rods - Forged Steel 
Bearing Clearance 0.0127-0.0559 mm,    0.0005-0.0022 in
Piston Pin Bore Diameter 24.966-24.978mm,    0.9829-0.9834 in
Side Clearance (two rods) 0.152-3.356mm,    0.006-0.014 in
Total Weight (less bearing) 726 grams,    25.61 oz
Crankshaft - Nodular Cast Iron

Connecting Rod

Journal Diameter . . . . . . . . . . . . .  53.950-53.975 mm,    2.124-2.125 in
Out of Round (max) . . . . . . . . . .    0.0254 mm,    0.001 in
Taper (Max) . . . . . . . . . . . . . . . . . 0.0254 mm,    0.001 inin

Diametrical Clearance

No 1: . . . . . . . . . . . . . . . . . . . . . . . . . 0.0127-0.0381 mm,    0.0005-0.0015 in
No 2, 3, 4 and 5 . . . . . . . . . . . . . . . .  0.0127-0.0508 mm,    0.0005-0.0020 in
Max Allowable (Nos. 2, 3, 4 & 5) . . 0.0635 mm, 0.0025 in

End Play . . . . . . . . . . . . . . . . . . . . . . .  0.051-0.178 mm,    0.002-0.007 in
   Max Allowable . . . . . . . . . . . . . . . .  0.254 mm,    0.010 in

Main Bearing Journals

Diameter . . . . . . . . . . . . . . . . . . . .  63.487-63.513 mm,    2.4995-2.5005 in
Out-of-Round (Max) . . . . . . . . . . .  0.0254 mm,    0.001 in
Taper (Max) . . . . . . . . . . . . . . . . .  0.0254 mm,    0.001 in

Valves
Stem to guide clearance
  • 0.001- 0.003 inch
  • maximum allowable (rocking method) 0.017 inch
Guide Diameter (std) 0.313 - 0.314 inch
 
Intake
Exhaust
Face angle 43.25 - 43.75 degrees 43.25 - 43.75 degrees
Seat Angle 44.25 - 44.75 degrees 44.25 - 44.75 degrees
Seat Width 0.040-0.060"  (1.016-1.524mm) 0.060-0.080"  (1.524-2.032mm)
Head Diameter 1.916 inch (48.666mm) 1.624 inch (41.250 mm)
Length Overall 4.893 - 4.918 inch 4.907 - 4.932 inch
Stem diameter 0.311 - 0.312 inch 0.371 - 0.372
Valve Timing

see table

Valve Lift (zero lash)
0.432"
Push Rod Length
6.915-6.935"   175.64-176.15mm

Valve Springs

  • Free length 1.967"   49.962mm
  • Installed height 1.64"  41.66mm
  • Spring Tension
    • Valve closed 85 lbs @ 1.64"
    • Valve open 200 lbs @ 1.212
  • Number of Coils 6.8
  • Wire Diameter 0.177" 4.50mm

This page would not have been possible without the help of Hank LaViers,
who graciously loaned me his extensive Mopar engine library

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Last Update: August 1, 2008