stanleywindrush Posted December 5, 2011 Share Posted December 5, 2011 Hiya I have been helping out a few people with rough running Willys and Hotchkiss jeeps. I thought I would share my knowledge with you - as it may help some people. In no way does this cover everything - but I think its a good starter for ten. If people can add to this please feel free as the more information out there the better for us jeep owners! Here goes - and PS dont shoot the messenger if it doesnt fully work for you!! Qu; My Hotchkiss Jeep doesn't run smoothly, and sometimes I can't start it! [TABLE=width: 656] [TR] [TD]area[/TD] [TD]cause[/TD] [TD]cause[/TD] [TD]root cause[/TD] [/TR] [TR] [TD]Fuel[/TD] [TD]Mixture[/TD] [TD]Too much fuel[/TD] [TD]Wrong float hieght in carb[/TD] [/TR] [TR] [TD][/TD] [TD][/TD] [TD][/TD] [TD]Idle screw screwed in too much[/TD] [/TR] [TR] [TD][/TD] [TD][/TD] [TD][/TD] [TD]Carb mechanical failure[/TD] [/TR] [TR] [TD][/TD] [TD][/TD] [TD][/TD] [TD]Timing incorrect[/TD] [/TR] [TR] [TD][/TD] [TD][/TD] [TD][/TD] [TD]Broken / failing valve[/TD] [/TR] [TR] [TD][/TD] [TD][/TD] [TD][/TD] [TD]Broken/ failing cam[/TD] [/TR] [TR] [TD][/TD] [TD][/TD] [TD][/TD] [TD]Fuel pump pumping too much fuel[/TD] [/TR] [TR] [TD][/TD] [TD][/TD] [TD][/TD] [TD]Fuel cut off valve in carb failed/ blocked[/TD] [/TR] [TR] [TD][/TD] [TD][/TD] [TD][/TD] [TD]Wrong type of fuel pump - pumping too much fuel due to lever profile incorrect[/TD] [/TR] [TR] [TD][/TD] [TD][/TD] [TD][/TD] [TD][/TD] [/TR] [TR] [TD][/TD] [TD][/TD] [TD]Too much air[/TD] [TD]Wrong idle screw setting - out too much[/TD] [/TR] [TR] [TD][/TD] [TD][/TD] [TD][/TD] [TD]Carb not flush against manifold - air intake[/TD] [/TR] [TR] [TD][/TD] [TD][/TD] [TD][/TD] [TD]Fuel bowl loose - air intake[/TD] [/TR] [TR] [TD][/TD] [TD][/TD] [TD][/TD] [TD]Fuel line loose - air intake[/TD] [/TR] [TR] [TD][/TD] [TD][/TD] [TD][/TD] [TD]Manifold loose - air intake[/TD] [/TR] [TR] [TD][/TD] [TD][/TD] [TD][/TD] [TD]Manifold cracked - air intake[/TD] [/TR] [TR] [TD][/TD] [TD][/TD] [TD][/TD] [TD]Fuel pump not assembled correctly - air intake[/TD] [/TR] [TR] [TD][/TD] [TD][/TD] [TD][/TD] [TD]Crank breather not attached - air intake[/TD] [/TR] [TR] [TD][/TD] [TD][/TD] [TD][/TD] [TD]Carb jets blocked[/TD] [/TR] [TR] [TD][/TD] [TD][/TD] [TD][/TD] [TD]Failure of inlet manifold letting in exhaust gasses through heat exchange [/TD] [/TR] [TR] [TD][/TD] [TD][/TD] [TD][/TD] [TD]Timing incorrect[/TD] [/TR] [TR] [TD][/TD] [TD][/TD] [TD][/TD] [TD][/TD] [/TR] [TR] [TD][/TD] [TD][/TD] [TD]Not enough Fuel[/TD] [TD]Pump broken[/TD] [/TR] [TR] [TD][/TD] [TD][/TD] [TD][/TD] [TD]Fuel line blocked[/TD] [/TR] [TR] [TD][/TD] [TD][/TD] [TD][/TD] [TD]fuel tank blocked (hotchkiss tanks have fuel strainer in bottom of tank - this can block easily)[/TD] [/TR] [TR] [TD][/TD] [TD][/TD] [TD][/TD] [TD]Fuel evaporation - engine too hot - blockage or failure of thermostat[/TD] [/TR] [TR] [TD][/TD] [TD][/TD] [TD][/TD] [TD]No fuel in tank[/TD] [/TR] [TR] [TD][/TD] [TD][/TD] [TD][/TD] [TD]Bad fuel/ water ingress etc[/TD] [/TR] [TR] [TD][/TD] [TD][/TD] [TD][/TD] [TD]Leak in fuel line[/TD] [/TR] [TR] [TD][/TD] [TD][/TD] [TD][/TD] [TD]Carb jets blocked[/TD] [/TR] [TR] [TD][/TD] [TD][/TD] [TD][/TD] [TD]CAM pump node badly worn/ broken[/TD] [/TR] [TR] [TD][/TD] [TD][/TD] [TD][/TD] [TD]Fuel filter blocked[/TD] [/TR] [TR] [TD][/TD] [TD][/TD] [TD][/TD] [TD]Flexible pipe from body to engine breaking down inside / collapsed[/TD] [/TR] [TR] [TD][/TD] [TD][/TD] [TD][/TD] [TD]too much air - see above[/TD] [/TR] [TR] [TD][/TD] [TD][/TD] [TD][/TD] [TD][/TD] [/TR] [TR] [TD][/TD] [TD][/TD] [TD]Not enough air[/TD] [TD]Air filter blocked[/TD] [/TR] [TR] [TD][/TD] [TD][/TD] [TD][/TD] [TD]Choke out / intentionally or by accident[/TD] [/TR] [TR] [TD][/TD] [TD][/TD] [TD][/TD] [TD]Icing up of carb in cold weather (very rare)[/TD] [/TR] [TR] [TD][/TD] [TD][/TD] [TD][/TD] [TD][/TD] [/TR] [TR] [TD]Electrics[/TD] [TD]Failure[/TD] [TD]poor spark[/TD] [TD]Breaking down condensor [/TD] [/TR] [TR] [TD][/TD] [TD][/TD] [TD][/TD] [TD]Leads attached to wrong plugs (i.e. wrong firing order)[/TD] [/TR] [TR] [TD][/TD] [TD][/TD] [TD][/TD] [TD]Breaking down coil[/TD] [/TR] [TR] [TD][/TD] [TD][/TD] [TD][/TD] [TD]Badly earthed engine[/TD] [/TR] [TR] [TD][/TD] [TD][/TD] [TD][/TD] [TD]Spark plug gaps incorrect[/TD] [/TR] [TR] [TD][/TD] [TD][/TD] [TD][/TD] [TD]Spark plugs broken down - terminals burnt out[/TD] [/TR] [TR] [TD][/TD] [TD][/TD] [TD][/TD] [TD]Points fused together or gap incorrect (too much or too little)[/TD] [/TR] [TR] [TD][/TD] [TD][/TD] [TD][/TD] [TD]Breaking down spark plug leads (Very common - I have had this happen on four jeeps now)[/TD] [/TR] [TR] [TD][/TD] [TD][/TD] [TD][/TD] [TD]Rotor arm incorrectly seated and hitting/ disturbing inside of dizzy[/TD] [/TR] [TR] [TD][/TD] [TD][/TD] [TD][/TD] [TD]Rotor arm carbon brush missing/ worn out[/TD] [/TR] [TR] [TD][/TD] [TD][/TD] [TD][/TD] [TD]Dizzy cap (white plastic inside) broken or missing terminals or spring to coil[/TD] [/TR] [TR] [TD][/TD] [TD][/TD] [TD][/TD] [TD]Feeding electrical wire to dizzy earthing/ touching other wires in wiring loom[/TD] [/TR] [TR] [TD][/TD] [TD][/TD] [TD][/TD] [TD]Batteries connected the wrong way around[/TD] [/TR] [TR] [TD][/TD] [TD][/TD] [TD][/TD] [TD]One or more batteries are extremely flat (when revved the engine cuts out)[/TD] [/TR] [TR] [TD][/TD] [TD][/TD] [TD][/TD] [TD]Dizzy earthing out due to loose wires inside dizzy.[/TD] [/TR] [TR] [TD][/TD] [TD][/TD] [TD][/TD] [TD][/TD] [/TR] [TR] [TD]Mechanical[/TD] [TD]Failure[/TD] [TD]Wrong timing[/TD] [TD]Distributor 180 degrees out[/TD] [/TR] [TR] [TD][/TD] [TD][/TD] [TD][/TD] [TD]Drive dog for distributor broken/ twisted[/TD] [/TR] [TR] [TD][/TD] [TD][/TD] [TD][/TD] [TD]Oil pump teeth broken where interfaces with cam[/TD] [/TR] [TR] [TD][/TD] [TD][/TD] [TD][/TD] [TD]Cam teeth broken or crank teeth broken.[/TD] [/TR] [TR] [TD][/TD] [TD][/TD] [TD][/TD] [TD]Oil pump is in wrong position where engaged with CAM. remove and turn around one set of teeth[/TD] [/TR] [TR] [TD][/TD] [TD][/TD] [TD][/TD] [TD][/TD] [/TR] [TR] [TD][/TD] [TD][/TD] [TD]Poor compression[/TD] [TD]Failure of pistons - broken/ holed - water/ foreign body in bores[/TD] [/TR] [TR] [TD][/TD] [TD][/TD] [TD][/TD] [TD]Broken missing piston rings[/TD] [/TR] [TR] [TD][/TD] [TD][/TD] [TD][/TD] [TD]Broken missing valve heads/ damanged stems[/TD] [/TR] [TR] [TD][/TD] [TD][/TD] [TD][/TD] [TD]Split / damaged block[/TD] [/TR] [TR] [TD][/TD] [TD][/TD] [TD][/TD] [TD]Head incorrectly seated/ tightened down[/TD] [/TR] [TR] [TD][/TD] [TD][/TD] [TD][/TD] [TD]Spark plug not properly screwed in / venting through plug body[/TD] [/TR] [TR] [TD][/TD] [TD][/TD] [TD][/TD] [TD]Failure of head gasket [/TD] [/TR] [TR] [TD][/TD] [TD][/TD] [TD][/TD] [TD]Valve springs broken[/TD] [/TR] [TR] [TD][/TD] [TD][/TD] [TD][/TD] [TD][/TD] [/TR] [TR] [TD][/TD] [TD][/TD] [TD]Resistance increased[/TD] [TD]Foreign body in bores[/TD] [/TR] [TR] [TD][/TD] [TD][/TD] [TD][/TD] [TD]Lack of oil etc increased friction and resistance (stop engine immediately!)[/TD] [/TR] [TR] [TD][/TD] [TD][/TD] [TD][/TD] [TD]Starter motor still engaged and not released[/TD] [/TR] [TR] [TD][/TD] [TD][/TD] [TD][/TD] [TD][/TD] [/TR] [/TABLE] I hope this helps! Baz Quote Link to comment Share on other sites More sharing options...
Richard Farrant Posted December 5, 2011 Share Posted December 5, 2011 Good list there, Baz. It will keep the jeep owners quiet while they go through that lot. One point, about the crankcase breather pipe, it will not make any difference to the running as it fits into the intake pipe, air filter to carb, so no effect to mixture. regards, Richard Quote Link to comment Share on other sites More sharing options...
stanleywindrush Posted December 7, 2011 Author Share Posted December 7, 2011 Thanks - hope it's of some use...you are right about crank case breather - my mistake.. Baz :nut: Its all those petrol fumes... Quote Link to comment Share on other sites More sharing options...
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