Peterbilt 587 starting

[Rawze]

(12-06-2023 )Samj Wrote:  It's definitely not fuel related as it acts like it's got dead batteries. You can hear starter kick in and then it just cuts out like no power to turn

ahh.... remove the belts main and A/C belts) from the pulleys. See if it starts normally. Bad alternator, bad water pump, bad AC compressor, bad pulley.. etc.

Turn the engine by hand (wrench in the front of the air compressor port) and see if it is harder to turn than normal vs. other engine. If it is really hard to turn by hand then it can be something internal like broke ring, maybe spun cam bearing.. etc., or maybe the tranny/clutch, etc. hanging it up.

Turn on the headlights too,. and see if they go really dim while cranking. They should only dim slightly. Maybe bad wiring to starter, bad ground at engine block, maybe bad jumper between batteries, poor contact at posts.. etc.etc.

Also check/ensure it is not hydralocking. Any thing funny with the coolant system>?. Loosing any coolant?.

Will it pass an injector leak-down test?.

When is the last time the fuel pump was checked for internal damage?... and when is the last time its guts (tappets, rollers, plungers) were replaced?. - if that fuel pump has gone bad, it may have blasted metal shavings thu the whole engine, damaging everything and making it harder to turn over.