Isuzu — Compression Pressure Measurement
Testing & diagnosis · Engine
From a Isuzu service manual — check it applies to your exact model before use.
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Procedure
- Start the engine and allow it to run for several minutes to warm it up.
- Stop the engine and cut the fuel supply.
- Remove all of the glow plugs from the engine.
- Set a compression gauge to the No. 1 cylinder glow plug hole.
- Turn the engine over with the starter motor and take the compression gauge reading.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Compression Pressure Standard: 31 kgf/cm2 (441/3.04) at 200 rpm
- Compression Pressure Limit: 22 kgf/cm2 (313/2.157)
Source: Isuzu 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.