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Car Forum / Australian Car Forums / 4x4 Cars (Australian group) / March 2008Roll starting an diesel
Hello all; Have any of you ever tried to start a diesel by letting it roll down a slope? No wise cracks please:-) I've dual batteries but often wondered what it would be like, if I had to; which gear to use etc. Frank > Hello all; > > Have any of you ever tried to start a diesel by letting it roll down a > slope? No wise cracks please:-) > I've dual batteries but often wondered what it would be like, if I had to; > which gear to use etc. I've done it OK with a BJ40 Landcruiser using 2nd gear but the engine was still hot, if your diesel needs glow plugs to start you may be in trouble with a flat battery. I've been told you can overcome that problem by pouring boiling water over the intake manifold but I've never tried it, direct injection diesels usually start OK without glow plugs so the boiling water trick wouldn't be needed. Daryl > > Hello all; > > > > Have any of you ever tried to start a diesel by letting it roll > > down a slope? Yep, some years ago when very poor and the owner of a diesel Landy. Depending on the gearing, the amount of compression and the amount of traction available, you may find that 3rd or 4th will work more reliably. > I've been told you can overcome that > problem by pouring boiling water over the intake manifold but I've > never tried it, Will work a treat - so will pointing a hair dryer, heat gun or even a blow lamp down the inlet tract. When I was a kid I remember the Mill engineers used to use a few old style soldering irons (the type you heated in a fire or witha blow lamp) bound together and shoved down the inlet to cold start a diesel genset. -- > Hello all; > [quoted text clipped - 4 lines] > > Frank Ive done it in 3rd no worries. Until a mechanic told me that its not a good idea. Puts a lot of strain on the timeing belt (If it has one) and should the belt be worn you risk stripping or skipping teeth. Ive only ever done it once and that was due to clapped out batteries. From teh time I replaced teh two (Surf with dual battery set up) it never let me soen. Actually left the park lights on for around 14 hours and it started like normal. But if you needed to crash start then Id say if you have a reasonable run up then 2rd will do you. >> Hello all; >> [quoted text clipped - 8 lines] > idea. Puts a lot of strain on the timeing belt (If it has one) and should > the belt be worn you risk stripping or skipping teeth. Did he tell you how exactly it would put any more strain on the timing belt than starting or running the engine normally? I'd probably ignore that advice I've roll/push started plenty of diesels uf it's cold and you have trouble getting it to fire you could use something like aerostart to get the first firing and it should run fine(if you have no aerostart try a rag dipped in petrol and place it near the air cleaner intake, be ready to remove it as soon as the engine starts though) > But if you needed to crash start then Id say if you have a reasonable run up > then 2rd will do you. yeah try 2nd gear first, if you get compression lock up try 3rd Kev >>> Hello all; >>> [quoted text clipped - 26 lines] > > Kev Something to do with direction of strain. Personally I cant see any difference over engine braking. Im not a mechanic so I cant tell you for sure, only that I was told its not a good idea. Maybe someone that is a deisel mechanic can put teh myth to bed. > Something to do with direction of strain. Personally I cant see any > difference over engine braking. Im not a mechanic so I cant tell you for > sure, only that I was told its not a good idea. Maybe someone that is a > deisel mechanic can put teh myth to bed. well think about it the starter motor works on the crank via the flywheel the rear wheels drive the crank via the flywheel through the gearbox no difference the crank is where the drive comes from to the belt, even when the engine is running it is driven by the crank I think he may have been a little confused Kev >> Something to do with direction of strain. Personally I cant see any >> difference over engine braking. Im not a mechanic so I cant tell you for [quoted text clipped - 13 lines] > > Kev It was somthing to do with reverse torque or from memory it was strain on teh timeing belt. Maybe due to compressions when cold maybe? f.ck knows, I may have the memory all f.cked up for all I know. ;o) : >> Something to do with direction of strain. Personally I cant see any : >> difference over engine braking. Im not a mechanic so I cant tell you for [quoted text clipped - 17 lines] : teh timeing belt. Maybe due to compressions when cold maybe? f.ck knows, I : may have the memory all f.cked up for all I know. ;o) I see it every day, often many times a day here. Just push started our Ute today, they only sell crap batteries here and parts are frightfully expensive. They push start coaster busses (local mass transport) every morning and every time they stop it. Petrol station service includes a push start. It's quite entertaining to see the coaster or Rosa busses with all the paying passengers pushing it to the petrol station when they run out of fuel. The customers get a discount for how far they pushed.  SignatureBrad Leyden 6° 43.5816' S 146° 59.3097' E WGS84 To mail spam is really hot but please reply to thread so all may benefit (or laugh at my mistakes) [snip]: >I see it every day, often many times a day here. Just push started our Ute >today, they only sell crap batteries here and parts are frightfully [quoted text clipped - 3 lines] >the paying passengers pushing it to the petrol station when they run out of >fuel. The customers get a discount for how far they pushed. At least the buggers up there will get off their bums and help themselves out -- down here these days too many people would just sit on their dots and phone their lawyers. Cheers, Phred. SignatureppnerkDELETE@THISyahoo.com.INVALID If its a modern diesel with electronics it may not start as the voltage may be too low to let the ECM do its thing. If it has an electric stop solenoid hit the starter as you let the clutch out >Hello all; > [quoted text clipped - 4 lines] > >Frank
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