Runaway 504 case engine

b.jones · Nov 9, 2021

On Monday I started a 2470 case with a 504 engine and it revved really high before I got it shut down. Sure enough I got some really good advice here. I took a cover off the pump, started spraying and carefully working the rack until it freed up. After I got it freed up, started it up and it would idle at 900 rpm. Thank you Dieseltech and all others that replied.. I really appreciate your help. B. Jones. North central Missouri.

Dieseltech · Nov 9, 2021

The best way to free one or more stuck plungers is to loosen ALL injector line nuts so engine will not start. Crank engine and gently pull/push the fuel stop at the same time, this will take several tries. If plunger/s are not stuck badly, you should eventually see the fuel supply turn on/off at ALL injectors with operation of the fuel stop. Once that is seen, tighten the lines and start engine. This method only works IF plunger/s are not stuck badly, pump MAY need torn completely down to free up the stuck parts. NEVER use a hammer to free a stuck rack, or the gear segment teeth may be broken.

Runaway 504 case engine

b.jones

Member

Dieseltech

Well-known Member

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