This car must not be "bump" started under any circumstances?
Discussion
Hi guys
I have a Mazda 6 Diesel as a daily hack. In the owners manual (yes i'm sad enough to read it all), it states under the "if your car own't start" section the procedure for jump-starting the car with a donor battery - all good.
However, half a page at least is taken up with a giant-lettered warning stating the car should never be "bump" or "tow" started under ANY circumstances.
Anyone car to hazard a guess why? Some H&S bulls
t reason? Or a genuine mechanical reason with a modern car?
I have a Mazda 6 Diesel as a daily hack. In the owners manual (yes i'm sad enough to read it all), it states under the "if your car own't start" section the procedure for jump-starting the car with a donor battery - all good.
However, half a page at least is taken up with a giant-lettered warning stating the car should never be "bump" or "tow" started under ANY circumstances.
Anyone car to hazard a guess why? Some H&S bulls
t reason? Or a genuine mechanical reason with a modern car?The usual reason is that harp on about damage to the cats with unburnt fuel etc. I've tow and bump started modern cars with cats many times and it's not a problem.
I guess if you had to do it enough it might poison the cat, but if the engine does start it'll flush it out pretty quickly I reckon.
I guess if you had to do it enough it might poison the cat, but if the engine does start it'll flush it out pretty quickly I reckon.
Not uncommon with modern highly stressed engines.
The older designs were very forgiving because they were seriously under stressed and could be treated with very little care.
Modern tolerances are just too tight for this kind of treatment.
Could be protecting piston rings, shear effect on components, oil pump not running, ete whatever. But manufacturers do this for a reason.
Actually with modern electronics and CPU's on cars being so easily affected by flashes caused by incorrect jump lead connections, jump leads are causing difficulties to some drivers.
Technology is wonderful but demanding.
The older designs were very forgiving because they were seriously under stressed and could be treated with very little care.
Modern tolerances are just too tight for this kind of treatment.
Could be protecting piston rings, shear effect on components, oil pump not running, ete whatever. But manufacturers do this for a reason.
Actually with modern electronics and CPU's on cars being so easily affected by flashes caused by incorrect jump lead connections, jump leads are causing difficulties to some drivers.
Technology is wonderful but demanding.
Steffan said:
Not uncommon with modern highly stressed engines.
The older designs were very forgiving because they were seriously under stressed and could be treated with very little care.
Modern tolerances are just too tight for this kind of treatment.
Could be protecting piston rings, shear effect on components, oil pump not running, ete whatever. But manufacturers do this for a reason.
Actually with modern electronics and CPU's on cars being so easily affected by flashes caused by incorrect jump lead connections, jump leads are causing difficulties to some drivers.
Technology is wonderful but demanding.
Too true, my dads SAAB 9-3 has a damaged ECU from jump starting it.The older designs were very forgiving because they were seriously under stressed and could be treated with very little care.
Modern tolerances are just too tight for this kind of treatment.
Could be protecting piston rings, shear effect on components, oil pump not running, ete whatever. But manufacturers do this for a reason.
Actually with modern electronics and CPU's on cars being so easily affected by flashes caused by incorrect jump lead connections, jump leads are causing difficulties to some drivers.
Technology is wonderful but demanding.
davepoth said:
Some cars have an layshaft driven oil pump for the gearbox (LT77 gearbox in Range Rovers/ SD1s had this) which doesn't turn if the car is in neutral and the engine is off, so damage can occur.
So what if you were driving along in neutral with the clutch dipped? Only the output shaft turning.....I suspect even with bump starting by pushing or rolling dowhill there is real possibility of damage albeit less likely.
I think it highly probable that the manufacturer has his specific reasons for advise never to attempt this method. The op could try his local main dealer there is usually at least one helpful mechanic who may well confirm the specific risks.
I have heard of several manufacturers who strongly advise against this method.
Modern cars are much more technically advanced and less forgiving than the older cars. Without modern lubricants for example most modern engines would be wrecked in a very short time.
Technology is fantastic from improving performance but has its downsides.
I think it highly probable that the manufacturer has his specific reasons for advise never to attempt this method. The op could try his local main dealer there is usually at least one helpful mechanic who may well confirm the specific risks.
I have heard of several manufacturers who strongly advise against this method.
Modern cars are much more technically advanced and less forgiving than the older cars. Without modern lubricants for example most modern engines would be wrecked in a very short time.
Technology is fantastic from improving performance but has its downsides.
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