1975 Thunderjet - Vintage Snow
1975 Thunderjet - Vintage Snow
1975 Thunderjet - Vintage Snow
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ENGINE TROUBLE SHOOTING<br />
13<br />
Prob lem Symptom Check<br />
Engine tu rns freely but will not sta rt No Spa rk Ignition sw itc h 'off '<br />
Emergency sw itc h 'off'<br />
Spa rk pl ug<br />
Igni ti on co ils<br />
COl Unit<br />
Ignition wi ri ng cut, pinched, or frayed<br />
No Fue l (spark plug dry)<br />
No Compress io n<br />
Floode d (sp ark plug wet)<br />
Bac k Firing<br />
Fuel tank em pty<br />
Vapo r lock (Hot eng ine on ly)<br />
Fue l filter plugged<br />
Fue l line di sconnected<br />
Fuel pump im pul se line d isconnected<br />
Foreign material or ice in carbureto r<br />
Cho ke disconnect ed<br />
Carbu retor loose on eng ine<br />
Hol e in pisto n<br />
Broken ring(s)<br />
Spa rk pl ug loose<br />
Head gas ket blo wn<br />
Hole in pi st on<br />
Broken rin g(s)<br />
Excessive wear<br />
Check for no spark (above)<br />
Cho ke eng aged<br />
To o much oi l in fuel m ix ture<br />
Wrong spark plug<br />
Exhaust pl ug ged<br />
Check for low compression (above)<br />
Carb uretor inlet valve leaking<br />
Carb uretor fl oat level to o high<br />
Spark plu g wires reversed<br />
Impulse li ne di sconnected<br />
Bad sp ark plug<br />
High ten sion lead resistor defecti ve (if<br />
equipped)<br />
COl unit defective<br />
Loose or f raye d ignitio n w irin g<br />
Ign ition sw itch faulty<br />
Impro per ignition timing<br />
Eng ine wi ll not turn over Seized Befo re Disassembly of engine<br />
check: Carb uretor adjustments<br />
Spark plug heat range and reach<br />
Fu el for o il, add it ives, etc.<br />
Ignition timing<br />
During Disassembly of engine<br />
ch eck: Loose co m po nents<br />
Gas kets -torn , mi ssing, damaged<br />
Seals- leaking, missi ng, damaged<br />
Unaut ho rized modifications<br />
Foreign material in engine<br />
Eng ine starts but has no power, Spark pl ug(s) wet Bad sp ark plug<br />
poor acceleration<br />
Choke partially engaged<br />
Carbureto r low speed m ixtu re<br />
Spark plug res istor bad (if equipped)<br />
Low compression<br />
Spark plug (s) dry<br />
Fuel system (same as no fuel check)
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