Isuzu 4le1t — Inspection of compression pressure
Testing & diagnosis · Cylinder
For the Isuzu 4le1t, from the Isuzu service manual.
Applies to: Isuzu 4le1t, Isuzu 4LE1 engine
Before you start
- Be sure to measure for all cylinders.
- Use the full-charged battery to maintain engine speed of 250 rpm or more.
Procedure
- Warm-up the engine.
- Disconnect the battery cable from the negative terminal and remove all glow plugs.
- Disconnect the wire connector of the solenoid for engine stopping.
- Install the battery cable to the negative terminal.
- Install an adapter and gauge of a compression gauge (special tool).
- Turn the starter until the gauge stabilizes and measure compression pressure for all cylinders.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- 3.04 {441} MPa {psi} standard; 2.5 {363} service limit; ±5 % or less difference between cylinders
Full service-parts list: Isuzu 4le1t →, Isuzu 4LE1 engine →
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.