Yanmar 4TNE88 — Nozzle valve sliding test
Testing & diagnosis · Fuel injection valve nozzle
For the Yanmar 4TNE88, from the Yanmar service manual.
Applies to: Yanmar 4TNE88, Yanmar TNE series engine
Before you start
- For a new nozzle, remove the seal peel and remove rust-preventive oil before use.
Procedure
- Thoroughly wash the nozzle valve using clean diesel oil.
- Hold the nozzle body vertically and lift the nozzle valve approx. 1/3 of its length.
- Check that the nozzle falls smoothly by its own gravity when released.
Tools required
- Clean diesel oil Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
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.