General Motors GMG-857 — Replace Coolant and Clean System
Maintenance · Cooling system
For the General Motors GMG-857, from the General Motors operator's manual.
Applies to: KEM GMG-857, General Motors 5.7L V8 (350 CID) engine
Before you start
- Use soft water; well or river water may cause scaling or rusting.
Procedure
- Open the radiator cap and drain cocks of engine crankcase and radiator to remove coolant.
- Close drain cocks, pour coolant into radiator, run engine until coolant is heated to about 80°C.
- If considerable scale or rust, pour in cleaning solution and heat to about 80°C.
- Continue to idle the engine for about 30 minutes.
- Stop engine, open drain cocks and drain coolant completely.
- Close cocks, pour in coolant and rinse until dirty water no longer runs out.
- Fill until coolant flows out from the overflow pipe.
- Run engine, stop, check and replenish coolant level.
Specs & values
- Replace coolant and clean system every 500 hours
- Heat coolant to 80°C or higher
Full service-parts list: KEM GMG-857 →
Source: General Motors operator'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.