Kohler — Drain Cooling System
Maintenance
From a Kohler owner's manual covering: LH640, LH685, LH685/LH690, LH690. Check it applies to your exact model before use.
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Before you start
- Hot liquid can cause severe burns. Do not loosen radiator cap while engine is operating or warm to touch.
Procedure
- Ensure engine is cool. Slowly loosen radiator cap to first stop to bleed pressure, then remove it. Loosen/remove radiator drain plug and allow coolant to drain.
- If equipped, remove coolant drain plugs on each side of engine block. Drain coolant. Apply pipe sealant with Teflon (Loctite PST 592 or equivalent) to threads and reinstall plugs. Torque plugs to 325
- Remove overflow hose from reservoir. Unhook inboard retainer and slide reservoir out of supports. Pour out contents and wash or clean as required. Dispose of old coolant per local ordinances.
- Reinstall reservoir cap. Do not kink/pinch hose.
Specs & values
- Coolant drain plug torque: 325 in. lb. (36.7 N·m)
Source: Kohler owner's 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.