2003 FORD MUSTANG Workshop Manual

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Page 929 of 4378

FORD MUSTANG 2003 Workshop Manual GENERAL PROCEDURES
Spark Plug —
Inspection
1. Inspect the spark plug for a bridged gap. �zCheck for deposit build- up closing the gap between the electrodes. Deposits are caused
by oil or carbon

Page 930 of 4378

FORD MUSTANG 2003 Workshop Manual 4. Inspect for normal burning.
�zCheck for light tan or gray deposits on the firing tip.
5. Inspect for pre- ignition, identified by melted electrodes and a possibly damaged insulator.
Metallic dep

Page 931 of 4378

FORD MUSTANG 2003 Workshop Manual 7. Inspect for fused deposits, identified by melted or spotty deposits resembling bubbles or
blisters. These are caused by sudden acceleration.
�zClean the spark plug. Klj . 3 ba
32003 Must

Page 932 of 4378

FORD MUSTANG 2003 Workshop Manual GENERAL PROCEDURES
Exhaust Manifold —
Inspection
1. Place a straight edge across the exhaust manifold flanges and check for warping with a feeler gauge.
SECTION 303-
00: Engine System — Genera

Page 933 of 4378

FORD MUSTANG 2003 Workshop Manual GENERAL PROCEDURES
Bearing —
Inspection
1. Inspect bearings for the following defects. Possible causes are shown: 1. Cratering — fatigue failure.
2. Spot polishing — incorrect seating.
3. I

Page 934 of 4378

FORD MUSTANG 2003 Workshop Manual Klj . 2 ba
22003 Mustang Workshop Manual
17. 11. 2011file:///C:/Ford/2000 - 2004/tsocache/SHEF_4464/S3B~us~en~ ...

Page 935 of 4378

FORD MUSTANG 2003 Workshop Manual SPECIFICATIONS
SECTION 303-
01A: Engine — 3.8L 2003 Mustang Workshop Manual General Specifications
Item Specification
Lubricants and Sealants
SAE 5W-
20 Premium Synthetic Blend Motor Oil
XO-

Page 936 of 4378

FORD MUSTANG 2003 Workshop Manual Valve seat angle 44.75 degrees
Valve spring free length —
Valve spring squareness —
Valve spring compression pressure —
valve
open (without damper) 1000 N (224 lbs) @ 29.2 mm (1.16 in)
Va

Valve seat angle 44.75 degrees
Valve spring free length —
Valve spring squareness —
Valve spring compression pressure —
valve
open (without damper) 1000 N (224 lbs) @ 29.2 mm (1.16 in)
Valve spring compression pressure —
valve
closed (without damper) 350 N (79 lbs) @ 40.7 mm (1.62 in)
Valve spring installed height 40.7 mm (1.62 in)
Valve spring installed pressure —
Rocker arm ratio 1.73
Hydraulic Lash Adjuster
Diameter 22.195-
22.212 mm (0.8738- 0.8745 in) Clearance-
to-bore 0.018-
0.068 mm (0.0007- 0.0027 in) Service limit 0.127 mm (0.005 in)
Hydraulic leakdown rate a
Collapsed lash adjuster gap —
Camshaft
Theoretical valve lift @ 0 lash —
intake 11.30 mm (0.45 in)
Theoretical valve lift @ 0 lash —
exhaust 11.47 mm (0.45 in)
Lobe lift —
intake 6.53 mm (0.257 in)
Lobe lift —
exhaust 6.57 mm (0.259 in)
Allowable lobe lift loss 0.127 mm (0.005 in)
Journal diameter 52.082-
52.108 mm (2.0505- 2.0515 in) Camshaft journal bore inside diameter —
No. 1 55.689-
55.664 mm (2.192- 2.191 in) Camshaft journal bore inside diameter —
No. 2
and No. 3 55.308-
55.283 mm (2.177- 2.176 in) Camshaft journal bore inside diameter —
No. 4 55.684-
55.664 mm (2.192- 2.191 in) Camshaft journal-
to-bearing clearance 0.025-
0.076 mm (0.001- 0.003 in) Runout 0.05 mm (0.002 in) runout of No. 2 or No. 3
relative to No. 1 and No. 4 End play 0.025-
0.150 mm (0.001- 0.006 in) Cylinder Block
Cylinder bore diameter 96.813 mm (3.81 in)
Cylinder bore maximum taper 0.050 mm (0.002 in)
Cylinder bore maximum out-of-
round 0.050 mm (0.002 in)
Main bearing bore inside diameter 68.905 mm (2.713 in)
68.885 mm (2.712 in)
Camshaft bearing bore inside diameter —
intake 47.097 mm (1.8542 in) max. 47.072 mm (1.8532
in) min. Camshaft bearing bore inside diameter —
exhaust 39.739 mm (1.5645 in) max. 39.714 mm (1.5635
in) min. Head gasket surface flatness 0.08 mm (0.003 in) in 152.0 mm (6.00 in)
Crankshaft
Main bearing journal diameter 63.983-
64.003 mm (2.5190- 2.5198 in) Klj . 2 ba
62003 Mustang Workshop Manual
17. 11. 2011file:///C:/Ford/2000 - 2004/tsocache/SHEF_4464/S3B~us~en~ ...

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