Yanmar 4TNE88 — Checking the battery
Maintenance
For the Yanmar 4TNE88, from the Yanmar service manual.
Applies to: Yanmar 4TNE88, Yanmar TNE series engine
Procedure
- Check the electrolyte level in each cell; add deionized water to UPPER LEVEL if low.
- Using a battery tester or hydrometer, check the state of the battery; recharge if discharged.
- Repair or clean the terminals if corroded or soiled.
- Repair or replace the fittings if corroded; re-tighten if loosened.
- Replace the battery if cracked or deformed; clean with fresh water if contaminated.
Tools required
Tool links are Amazon searches (affiliate links); manufacturer special tools may only be available from a dealer.
Specs & values
- Specific gravity corrected to 20 C by S20 = St + 0.0007 (t-20)
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.