Ford Mustang (1999-2004) Service Manual: Valve Spring Strength
Special Tool(s)
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Pressure Gauge, Valve/Clutch Spring 303-006 (TOOL-6513-DD) or equivalent |
1. Use a Valve/Clutch Spring Pressure Gauge to check the valve spring for correct strength at the specified valve spring length.
- Refer to the appropriate section in Group 303 for the procedure.
- If out of specification, install new components as necessary. Refer to the appropriate section in Group 303 for the procedure.

Valve Stem to Valve Guide Clearance
Special Tool(s)
Dial Indicator Gauge with
Holding Fixture
100-002 (TOOL-4201-C) or
equivalent
Clearance Gauge, Valve Guide
303-004 (TOOL-6505-E) or
equivalent
NOTE: Valve ...
Valve - Seat Inspection
Valve and Seat Refacing Measurements
CAUTION: After grinding valves or valve seats, check valve
clearance.
1. Check the valve head and seat.
Check valve angles.
Check margin width.
Refer t ...
Other materials:
Vehicle certification label
The National Highway Traffic Safety
Administration Regulations require
that a Safety Compliance Certification
Label be affixed to a vehicle and
prescribe where the Safety Compliance
Certification Label may be located.
The Safety Compliance Certification
Labe ...
Starting a gasoline engine
When you start the engine, the idle speed increases, this helps to warm
up the engine. If the engine idle speed does not slow down automatically,
have your vehicle checked by an authorized dealer.
Before starting the engine:
• Make sure all occupants have f ...
Driving through water
WARNING: Drive through water in an emergency only, and not
as part of normal driving.
WARNING: Engine damage can occur if water enters the air
filter.
Note: Driving through deep water may allow water into the transmission
or air intake and can cause internal v ...

