Yanmar 4TNE88 — Measuring the compression pressure
Testing & diagnosis · Engine
For the Yanmar 4TNE88, from the Yanmar service manual.
Applies to: Yanmar 4TNE88, Yanmar TNE series engine
Before you start
- Never fail to attach the gasket to the tip of the adapter.
Procedure
- Warm up the engine.
- Remove the fuel injection pipe and fuel injection valve from the cylinder to be measured.
- Crank the engine with regulator handle at STOP before attaching the gauge adapter.
- Attach the compression gauge adapter and compression gauge to the cylinder.
- Crank the engine with the starting motor until the reading stabilizes.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Compression pressure per model at 250 rpm
Full service-parts list: Yanmar 4TNE88 →
Source: Yanmar 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.