Valve Train Analysis

ENGINE COMPONENT TEST

Valve Train Analysis - Engine Off

Static checks (engine off) are to be made on the engine prior to the dynamic analysis.

Valve Train Analysis - Engine Off, Valve Cover Removed

NOTE:For the removal and installation of the valve cover, see - for 2.3L engine, see -- Valve Cover - RH Removal / Installation and See -- Valve Cover - LH Removal / Installation for 4.0L engine.Check for damaged and/or severely worn parts and correct assembly. Make sure correct parts are used with the static valve train analysis.

Valve Train Analysis - Engine Off, Valve Tappets

Inspect the valve tappets for:

- Excessive tappet gap
- Sticking tappet bucket
Replace valve tappets as necessary. See appropriate Mazda B-Series Engine Service Information.

Valve Train Analysis - Engine Off, Camshaft - Overhead Camshaft Engines

Inspect the camshaft for:

- Scoring
- Scratches
- Excess wear on the camshaft lobes
Replace the camshaft if necessary. See appropriate Mazda B-Series Engine Service Information.

Valve Train Analysis - Engine Off, Valve Springs

1. Check for broken or damaged valve springs.

2. Check valve spring strength. See appropriate Mazda B-Series Engine Service information.
Replace as necessary.

Valve Train Analysis - Engine Off, Valve Spring Retainer and Valve Spring Retainer Keys

Check for proper seating of valve spring retainer keys on the valve stem and in the valve spring retainer.

Valve Train Analysis - Engine Off, Valves and Cylinder Head

1. Check for plugged oil drain back holes.

2. Check for worn or damaged valve tips.

3. Check for missing or damaged valve stem seals.

4. Check for excessive valve tappet gap.

5. Check installed valve spring length. See appropriate Mazda B-Series Engine Service Information.
Replace components as necessary.

Valve Train Analysis - Engine Running

NOTE:Static checks (engine off) are to be made on the engine prior to the dynamic analysis.Prior to performing any dynamic checks, make sure the transmission is in P (Park) (A/T) or N (Neutral) (M/T) and the parking brake is fully engaged.Start and idle the engine. Check for proper operation of all parts.

1. Check for plugged oil gallery in the rocker arms or cylinder head.

2. Check for proper valve train lubrication.

Valve Train Analysis - Engine Running, Rocker Arm

1. Check for plugged oil in the rocker arms or cylinder head.

2. Check for proper overhead valve train lubrication.
If insufficient oiling is suspected, accelerate the engine to 1,200 rpm ± 100 rpm with the transmission in NEUTRAL and the engine at normal operating temperature. Oil should spurt from the rocker arm oil hole such that valve tips and rocker arms are well oiled and/or, with the valve covers off, oil splash may overshoot the rocker arms. If oiling is insufficient for this to occur, check the oil passages for blockage.