Ford — Hydraulic Lash Adjuster Leakdown Test
Testing & diagnosis
From a Ford service manual covering: 140 CID, 2.3 LITRE, 2300 cc, LSG-423. Check it applies to your exact model before use.
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Procedure
- Disassemble and clean lifter to remove all traces of engine oil.
- Place lifter in tester with plunger facing upward; pour hydraulic tester fluid into cup to cover assembly.
- Adjust ram length so pointer is 1/16 inch below starting mark when ram contacts plunger.
- Work plunger up and down until lifter fills with fluid and air bubbles disappear.
- Allow ram and weight to force plunger down; measure time from Start Timing to Stop Timing marks.
- A satisfactory lifter must have leak-down rate within specified minimum and maximum limits.
- Replace lifter if not within specifications.
- Remove fluid and bleed lifter by working plunger up and down.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Leakdown rate 2-8 seconds
Source: Ford service manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.