Golf doesn't start sometimes

[vmq6695]

Maybe next time professor vmq could post in english

You didn't think austenitic was English?

For that, you have to thank an English metallurgist, Bill Roberts-Austen.

He's the one that identified the significance of face centred cubic crystal structures in steel alloys. So fcc steel alloys are called austenite or austenitic steels, in honour of Bill (note that his legal name was William Chandler Roberts-Austen, but he didn't like being referred to by his first two initials).

One way to force steel, which otherwise likes to form body centred cubic crystals, into face centred cubic crystal structures is to add nickel atoms. Or cobalt. It's the crystal shape (or if you prefer the quantum nature of the electron cloud of iron atoms that is behind the crystal structure) that stops the rusting and ferromagnetism.

Cheers

V

[Russ59]

hehe.

i would say an air leak like this is no more or less likely to be occasioned in a car with more or less km's on the clock.... a service tech giving a fuel ine a good whack by accident could have disturbed a line, or perhaps even a crack somewhere....

air leaks are invariably difficult to find, and the intermittent nature of the problem means one is less likely to have a good go at fixing it.... as such they tend to hang around until one day, you just find the cause of it by accident

Any implant is unlikely to be ferritic and so not attracted by a magnet. It will either be an austenitic stainless steel or something more exotic (eg platinum).

Some inexpensive stainless steels are ferritic, but quality stainless steels are austenitic - the iron atoms form a face centred cubic crystal so you get a largish spacing between the iron atoms and a relatively low density of electron energy levels. Those two factors (the interatomic spacing and the low density of electron energy levels) mean that the magnetic moments of the atoms within the crystals do not align, so you don't get ferromagnetism.

That's why you always carry a small magnet when you go shopping for stainless steel: poor quality stainless steel is magnetic and will rust; the higher quality ss is not magnetic.

Are you sure this pair aren't related ?

[Russ59]

You didn't think austenitic was English?

For that, you have to thank an English metallurgist, Bill Roberts-Austen.

He's the one that identified the significance of face centred cubic crystal structures in steel alloys. So fcc steel alloys are called austenite or austenitic steels, in honour of Bill (note that his legal name was William Chandler Roberts-Austen, but he didn't like being referred to by his first two initials).

One way to force steel, which otherwise likes to form body centred cubic crystals, into face centred cubic crystal structures is to add nickel atoms. Or cobalt. It's the crystal shape (or if you prefer the quantum nature of the electron cloud of iron atoms that is behind the crystal structure) that stops the rusting and ferromagnetism.

Cheers

V

That was just my attempt at humour - Humour is a characteristic or the quality of being funny. Thus it is the trait of invoking amusement or lightening the mood through wit. Thus it can be defined as an ability which enables a person or a situation to evoke, fun, joy and laughter in others. Thus it can only be described as a complex phenomenon which is capable of making us laugh and evoke mirth. It is difficult to aptly define humour, anyway what's the point of trying, if you're a teacher or lecturer, that's something you probably wouldn't understand (unless you Googled it)

Oh crap, it's contageous

[Preen59]

That was just my attempt at humour - Humour is a characteristic or the quality of being funny. Thus it is the trait of invoking amusement or lightening the mood through wit. Thus it can be defined as an ability which enables a person or a situation to evoke, fun, joy and laughter in others. Thus it can only be described as a complex phenomenon which is capable of making us laugh and evoke mirth. It is difficult to aptly define humour, anyway what's the point of trying, if you're a teacher or lecturer, that's something you probably wouldn't understand (unless you Googled it)

Oh crap, it's contageous

Hahahaha. There's no comeback for that.

[Russ59]

Hahahaha. There's no comeback for that.

I don't know about that Preeny, he's probably sitting down right now with his calculator and slide rule with glasses poised on his nose trying to work out his next move Little does he know, I'll be waiting like a Praying Mantis, ready to strike back

[Preen59]

I don't know about that Preeny, he's probably sitting down right now with his calculator and slide rule with glasses poised on his nose trying to work out his next move Little does he know, I'll be waiting like a Praying Mantis, ready to strike back

Hahaha. Feeling lonely, Russ??

Actually, i'd like him to explain what causes work hardening in steels... I know how to prevent it but i'd like to know what happens (thats how railway line works).

Seriously.

[Russ59]

Hahaha. Feeling lonely, Russ??

Actually, i'd like him to explain what causes work hardening in steels... I know how to prevent it but i'd like to know what happens (thats how railway line works).

Seriously.

Google is your friend

I'm not lonely, I've always got the Missus to nag me about spending too much time on here

[Preen59]

Google is your friend

I'm not lonely, I've always got the Missus to nag me about spending too much time on here

Hahahaha, *Ducks, and slowly turns around to see if she was close enough to read that..*

[Russ59]

Hahahaha, *Ducks, and slowly turns around to see if she was close enough to read that..*

Comments like that are generally posted when she leaves the room or is otherwise pre occupied

[comfortline]

Spot the engineer...or metallurgist. Funny my missus is a lecturer in mechanical engineering and teaching in singapore atm. That's where I am.

So I've been listening to this myself in the last few days!

You didn't think austenitic was English?

For that, you have to thank an English metallurgist, Bill Roberts-Austen.

He's the one that identified the significance of face centred cubic crystal structures in steel alloys. So fcc steel alloys are called austenite or austenitic steels, in honour of Bill (note that his legal name was William Chandler Roberts-Austen, but he didn't like being referred to by his first two initials).

One way to force steel, which otherwise likes to form body centred cubic crystals, into face centred cubic crystal structures is to add nickel atoms. Or cobalt. It's the crystal shape (or if you prefer the quantum nature of the electron cloud of iron atoms that is behind the crystal structure) that stops the rusting and ferromagnetism.

Cheers

V

[comfortline]

Okay, I too have had this problem with the golf not starting. So I have to ask you a couple of questions.

1. How much fuel was in the tank?
2. Is yours a pre 2007?

For me the problem is associated with the tank pump. Under the back seat lies the pump. It has a line to the engine and a return (and wiring) going to the tank.

The pump in the tank, is housed in a "bucket". This stops debris getting in. The bucket itself is about 1/2 depth of the tank. The return empties into the bucket.

For me, when the tank got less then 1/2 full the pump would suck air. ie: the bucket was empty. Ergo, no start. So after some careful tinkering to remove it (I don't recommend you do it.) I found that the electric motor for the pump (inside the tank) has two lines, one to the engine and another which runs down the outside of the bucket.

At the bottom of the bucket, this smaller hose from the pump motor sprays a jet at a little flap, which opens allowing the bucket to fill from underneath. My flap was seized. I poked the flap with a cable tie removing the crust (whatever it was) allowing it to open freely. This stopped the problem.

So now it will start when the level drops below half.

It does have rough starts every now and again, but i find it is usually my impatience to start the car.

To remove and clean, you're looking at 1 hour of labor if you can get VW to believe you. A new pump is 380.

Hope it helps.

Cheers
David

[Russ59]

Okay, I too have had this problem with the golf not starting. So I have to ask you a couple of questions.

1. How much fuel was in the tank?
2. Is yours a pre 2007?

For me the problem is associated with the tank pump. Under the back seat lies the pump. It has a line to the engine and a return (and wiring) going to the tank.

The pump in the tank, is housed in a "bucket". This stops debris getting in. The bucket itself is about 1/2 depth of the tank. The return empties into the bucket.

For me, when the tank got less then 1/2 full the pump would suck air. ie: the bucket was empty. Ergo, no start. So after some careful tinkering to remove it (I don't recommend you do it.) I found that the electric motor for the pump (inside the tank) has two lines, one to the engine and another which runs down the outside of the bucket.

At the bottom of the bucket, this smaller hose from the pump motor sprays a jet at a little flap, which opens allowing the bucket to fill from underneath. My flap was seized. I poked the flap with a cable tie removing the crust (whatever it was) allowing it to open freely. This stopped the problem.

So now it will start when the level drops below half.

It does have rough starts every now and again, but i find it is usually my impatience to start the car.

To remove and clean, you're looking at 1 hour of labor if you can get VW to believe you. A new pump is 380.

Hope it helps.

Cheers
David

So what you're really saying is that if we don't give these little flaps a poke every now and then, they will seize up and go crusty around the edges. (what a great new pick up line ) Just wondering if using some lubrication around the edges would help ?

Sorry David, I just couldn't help myself

[Transporter]

Okay, I too have had this problem with the golf not starting. So I have to ask you a couple of questions.

1. How much fuel was in the tank?
2. Is yours a pre 2007?

For me the problem is associated with the tank pump. Under the back seat lies the pump. It has a line to the engine and a return (and wiring) going to the tank.

The pump in the tank, is housed in a "bucket". This stops debris getting in. The bucket itself is about 1/2 depth of the tank. The return empties into the bucket.

For me, when the tank got less then 1/2 full the pump would suck air. ie: the bucket was empty. Ergo, no start. So after some careful tinkering to remove it (I don't recommend you do it.) I found that the electric motor for the pump (inside the tank) has two lines, one to the engine and another which runs down the outside of the bucket.

At the bottom of the bucket, this smaller hose from the pump motor sprays a jet at a little flap, which opens allowing the bucket to fill from underneath. My flap was seized. I poked the flap with a cable tie removing the crust (whatever it was) allowing it to open freely. This stopped the problem.

So now it will start when the level drops below half.

It does have rough starts every now and again, but i find it is usually my impatience to start the car.

To remove and clean, you're looking at 1 hour of labor if you can get VW to believe you. A new pump is 380.

Hope it helps.

Cheers
David

Good on you, thanks for posting it.
Maybe using the diesel fuel additive could prevent the problem to become a problem.

[THR]

Great, I come back after a few days and see there's 5 pages of off-topic crap posted in this thread.

Problem occurred again today, so will have to take it back to the dealer.

But might as well close this thread as it's become a bit useless.

[Transporter]

What...., you don't like reading?
Surely there are some ideas what it could be in these 5 pages.
I would be glad, if it was me, and you can always skip over the messages that are not on topic.