Mazda CX-5 Service & Repair Manual: Hydraulic Lash Adjuster (Hla) Inspection

Mazda CX-5 Service & Repair Manual / Engine / Engine Assembly / Valvetrain, Cylinder Head / Hydraulic Lash Adjuster (Hla) Inspection

HLA Troubleshooting


Item	Occurrence	Possible cause	Action
1	After replacing oil, sound occurs when starting engine	Oil shortage in oil passage	Maintain the engine speed between 2,000 to 3,000 rpm for approx. 2 s and 10 min*, and verify that the sound disappears. If the sound disappears, the HLA is normal. If the sound does not disappear, go to item 5.
2	Sound occurs at instant when engine is started on vehicle left for 1 day	Oil shortage in oil passage
3	Starter cranked for 3 s or more and sound occurs directly after engine is started	HLA oil shortage
4	Sound occurs directly after engine is started with newly replaced HLA	HLA oil shortage
5	Sound occurs continuously for 10 min or more	Insufficient oil pressure	Inspect the oil pressure.. If less than the specification, inspect each part of the engine.
5	Sound occurs continuously for 10 min or more	HLA malfunction	Inspect the HLA..
6	Sound occurs during idling after high-speed driving	Incorrect engine oil level	Inspect the engine oil level..
6	Sound occurs during idling after high-speed driving	Engine oil deterioration	Replace the engine oil..

* Period of time engine oil flows to the HLA, this value includes tolerance caused by the ambient temperature and the oil used.

HLA Inspection

1. Disconnect the negative battery cable..

2. Remove the plug hole plate..

3. Remove the ignition coil/ion sensors..

4. Remove the cylinder head cover..

5. Press the rocker arm from above and verify that the HLA does not drop.

If the HLA drops, replace the HLA..

6. Install in the reverse order of removal.

Cylinder Head

Outline With the adoption of the rocker arm (built into needle roller bearing), the sliding resistance has been reduced. With the adoption of the HLA, the valve clearance is maintain ...

Hydraulic Lash Adjuster (Hla) Removal/Installation

WARNING: A hot engine can cause severe burns. Turn off the engine and wait until it is cool before servicing. CAUTION: If the camshaft is rotated with the timing chain removed ...

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