Yanmar 4TNE88 — Checking the cooling water system and radiator for water leakage
Maintenance · Cooling system / radiator cap
For the Yanmar 4TNE88, from the Yanmar service manual.
Applies to: Yanmar 4TNE88, Yanmar TNE series engine
Before you start
- The cooling water system can be checked effectively while the engine is warm.
Procedure
- Supply cooling water up to normal level in the radiator and attach the cap tester body to the radiator.
- Start the cooling water pump and set to a pressure of 0.9+0.15 kgf/cm2.
- Detect any portion where cooling water leaks.
- For the radiator cap, attach it to a cap tester and set the tester to 0.9+0.15 kgf/cm2.
- Check whether the cap opens at the set pressure; replace if defective.
Tools required
- Cap tester Amazon
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- 0.9+0.15 kgf/cm2
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.