Thread: Crank starting a Defer or Disco deisel from rear wheel

I'll try on sunday,my day off and let you know. Pat

wont happen without some severe engine preperation.. and you CANT do some of it with the suzi or the tdi.


to do it on a 2.25d

remove the rocker cover
space 3 of the exhaust valve rockers 3/16th of an inch to decompress 3 pots. (I use washers with bits of wire tied off of them.
preheat the inlet manifold with a propane torch with pot thats not been decompressed on the rock so it gets preheated.
set full fuel engine to run
crack the injector union, turn the engine by hand till the injector line is primed, then reseal the union.
Wait while the engine preheats
crank it over.
when it fires pull the adjuster shims out.
replace the rocker cover.


best of luck.

(your holden engine had a compression ration of about 8.5-9.3:1 a the lowest compression ratio diesel engine I know of is about 16:1 the suzi is about 19:1 as is the tdi.)

Dont forget to turn the key on!

Cheers Arthur

one snatch strap wrapped around the back wheel, local footy team to run with the strap.

motor starts! front wheel drags back wheel onto ground, footy team is pulled off their feet and fly in all directions, land rover gains momentum.

Anything is possible!

Originally Posted by Blknight.aus

wont happen without some severe engine preperation.. and you CANT do some of it with the suzi or the tdi.


to do it on a 2.25d

remove the rocker cover
space 3 of the exhaust valve rockers 3/16th of an inch to decompress 3 pots. (I use washers with bits of wire tied off of them.
preheat the inlet manifold with a propane torch with pot thats not been decompressed on the rock so it gets preheated.
set full fuel engine to run
crack the injector union, turn the engine by hand till the injector line is primed, then reseal the union.
Wait while the engine preheats
crank it over.
when it fires pull the adjuster shims out.
replace the rocker cover.


best of luck.

(your holden engine had a compression ration of about 8.5-9.3:1 a the lowest compression ratio diesel engine I know of is about 16:1 the suzi is about 19:1 as is the tdi.)

What about an engine that is already warmed up but has stalled, and the vehicle has a flat battery?
And as mentioned earlier, although the deisels compression ratio is a bit more than double the Holden, the wheel to crankshaft ratio, due to the effect of 2 differentials is more than halved.
I think the Wrinkly ones scenario wouldn't be far off the mark with the Suzi because it shakes and vibrates the drive line to hell, even when roll starting down a steepish hill.
Wagoo.
wagoo.

Dual battery perhaps........?????????

Jumper leads......????????

Roll start.........???????

Using Capitals, the difference between helping your Uncle Jack off a horse or helping your uncle jack off a horse...

Can be done with 20 people we use to start Unimogs by a rope around the rear wheel.

with the engine already warmed up you would only have to decompress 3 pots so that you can build enough momentum to get that one pot to fire.


the problem you face is pretty much this...

you cant apply enough force fast enough, this is why roll starting works...
trying to crank start from one wheel you have to pretty much turn the engine over from the get go, you have no opportunity to store any energy anywhere so if the resistance of the engine stops you from getting it to turn over fast enough to fire it wont start. Typically to turn the wheel over you're going to use your hands which means you're not using your strongest muscles.

Push starting a vehicle means you get to store some energy in the vehicle (its rolling in neutral and weights 2t+) you put it in gear dump the clutch and all the energy that youve stored in the vehicle as momentum from pushing it (and you're using your strongest muscles in your legs to generate it) is applied to the crank in one big hit.


Also working against you is the ignition method. With a petrol (at least an old school carbied, dizzy driven ignition type) you just have to get the engine to turn over a few times and once its sucked in a fuel air mix it'll fire because the ignition is electrically driven and the speed of the cranking plays very little part, if you cant get it to fire or it tries to kick back you can just retard the timing so that its trying to fire post TDC, thats not so easy to do in a diesel.