J

JIMBO83

New Member
My S3 has a tendancy to stay running after turn her offf, not for long but just for sort of 3o seconds or so, which isn't a problem, and isn't the problem that I'd like some help on....It's this...
As I siad she stays running, well today I turned her off, but then started her up to quickly, so in effect turned tried to turn her over while the engine was still running, in a matter of secoinds, before I could witch her off-it made a slipping, high pitch grinding sort of noise, and now when I try to start her up it makes a whirring clicking noise and won't turn over. Have I wrecked the starter motor? Or is it something else, and is it fixable by me, or is it gonna involve new parts?
Thanks a lot guys,
James
 
Starter motor bendix or flywheel ring gear - take the starter motor out and check the teeth at the end - if they seem reasonable then check the ring gearteeth thro the hole left by the starter motor. Yu will need to get someone to turn the engine over slowly so yu can check the complete circumference. dont furget to mark the flywheel else yu wont know when yu have done a full revolution.
 
Aye, wot Daft sed. Can't add to that!

Ere' Daft, talking of III's turning over............How'sit going @ yers?
 
And the overrun, just turn the distributer anticlock wise a few degrees, WHEN you get her running again.
 
The Mad Hat Man said:
Starter motor bendix or flywheel ring gear - take the starter motor out and check the teeth at the end - if they seem reasonable then check the ring gearteeth thro the hole left by the starter motor. Yu will need to get someone to turn the engine over slowly so yu can check the complete circumference. dont furget to mark the flywheel else yu wont know when yu have done a full revolution.
Click to expand...
i would most humble like to point out that if the section of flywheel that is visible throu the starter hole has good teff then the fooker should turn over. on the other hand if it int, it wint.
so you really dint have no need to turn the fooker all the way round.
 
the tendancy to stay running.


"My S3 has a tendancy to stay running after turn her offf, not for long but just for sort of 3o seconds or so, which isn't a problem, and isn't the problem that I'd like some help on....It's this...
As I siad she stays running, well today I turned her off, but then started her up to quickly, so in effect turned tried to turn her over while the engine was still running, in a matter of secoinds, before I could witch her off-it made a slipping, high pitch grinding sort of noise, and now when I try to start her up it makes a whirring clicking noise and won't turn over. Have I wrecked the starter motor? Or is it something else, and is it fixable by me, or is it gonna involve new parts?"

Or whatever you call it
 
Yup that's what I'd cal Overrun On big old horizotaly opposed diesel engines there's the danger that if you got overrun it'd suck oil in from the engine and run away till she blew herself up.
Another cause (if my memory serves me right) was excessive coking up of the cylinders but this was caused by running up with no load on the engine.
 
what you've got is 'running on' not 'over run'. over run is related to engine braking. I.E braking on the over run.
causes of running on....
ign too far advanced , running too hot or too rich. any hot spots in the combustion chamber can also cause it.

over run is caused by taking yer foot off the throttle
 
i've seen this happen on the diesel engines I run at work, not the 'running on' but the broken starter motor. 9 times out of 10 when the starter motor bendix is broke the flywheels have also been broken. Its always happened when the starter engages while the engines running, makes some impressive sparks!!!:cool: They are big v8 diesel monsters though so hopefully it'll no be so bad!

all the series landrovers i've know have 'run on', i was always told it was because when they were really hot the air/fuel in the piston would ignite with out a spark!
 
doobie said:
i've seen this happen on the diesel engines I run at work, not the 'running on' but the broken starter motor. 9 times out of 10 when the starter motor bendix is broke the flywheels have also been broken. Its always happened when the starter engages while the engines running, makes some impressive sparks!!!:cool: They are big v8 diesel monsters though so hopefully it'll no be so bad!

all the series landrovers i've know have 'run on', i was always told it was because when they were really hot the air/fuel in the piston would ignite with out a spark!
Click to expand...
and if they told you the moon wur made of cheese would you believe it?
 
It ios worth noting that in almost all 4 cylinder engines, the things stops in one of only two positions. ]


This means that the starter pinion engages with the ring gear in only one of thiose two positions.

For those of you with inertia starters that is why the ring gear gets mangled up and occasionally needs to be replaced.

CharlesY
 
because when they were really hot the air/fuel in the piston would ignite with out a spark!

Slob, how does air/fuel get in the piston?

Is a piston hollow or porous?
 
CharlesY said:
because when they were really hot the air/fuel in the piston would ignite with out a spark!

Slob, how does air/fuel get in the piston?

Is a piston hollow or porous?
Click to expand...

sorry, i ment air/fuel in the combustion chamber, not actually in the piston! :eek: so as the engine is switched off the fuel ignites due to the temperature in the chamber, without the spark plug sparking and turns the engine over again........
 
Not sure if it's been agreed by all, but I'm just adding my twopenny to the running-on. When a petrol engine runs too lean it can run very hot. the temperature in the chamber gets much hotter that it should. This heats the carbon deposits (coke) in the chamber. They glow white/red hot. You stop the sparks from the spark plugs and the carbon deposits continue to ignite the petrol vapor that continues to be pumped in as you have a mechanical fuel pump. ;)

Never heard of it doing any harm, but it can be quite clattery as the oil pressure will be a bit low as it does it. The excess temperature can cause scorched valves, etc. Generally best to put it right...
 
it can cause damage cos the shock waves are walloping the piston as it on its way up causing a ship load of shock forces to be transferred to the big and little end bearings. normal ignition occurs just before TDC to ensure that max pressure is applied at TDC. with pre ignition max pressure occurs while piston is still travelling up the bore.
that 'pinking' sound is the shock waves bouncing around yer combustion chamber
 
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