MG ZT 190 engine failure on motorway! - Page 3

Jules · 24th January 2013, 19:54

We cannot diagnose this with the given evidence so far.
As Brian says maybe speak to Bruce first.
He has many contacts in Oz .
Are you a member of any British car clubs in Oz?

Donthemac · 25th January 2013, 02:06

Just been informed timing belt is broken. Thanks for discussion. Hope it will also help others

workaholic_ro · 25th January 2013, 06:32

Quote:

Originally Posted by Donthemac

Just been informed timing belt is broken. Thanks for discussion. Hope it will also help others

Sorry to hear that. Take a look at this thread:

http://www.the75andztclub.co.uk/foru...d.php?t=131681

SD1too · 25th January 2013, 06:55

Quote:

Originally Posted by Donthemac

I hope you are wrong too, Simon, as I had all belts replaced 14,000km and 19 months ago.

Quote:

Originally Posted by Donthemac

Just been informed timing belt is broken.

Well that's worrying. As I think someone pointed out, I wonder if the tensioner/idler devices were renewed at the same time. Will you be asking the garage which did the original work to take responsibility?

Simon

Jules · 25th January 2013, 08:00

Agree with Simon.
Further more the actual diagnosis has to be investigated further.

ie
Has the belt actually snapped or come off one of the pulleys out of view.
How far did they strip it down?
One would have to question either the workmanship or quantity of parts fitted.

Is the plastic idler the cause and was the metal tensioner set up properly after the pin was removed.
Were the new cam bolts under/overtightened?
Were the bolts new?!

Was the water pump the cause?
Did the lower sprocket fail (very rare)
Did a camshaft snap ?(also rare)

Donthemac · 26th January 2013, 01:59

Yes, the person who did the work also doubts diagnosis and is travelling to assess for himself. He is indeed one of Melbourne's experts from the dealership. Waiting till Australia Day holiday is over. I will consider all the items suggested also, thanks

Donthemac · 5th March 2013, 09:33

Did a camshaft snap ?(also rare)

Yes Jules, it seems it did. I have not yet seen broken parts. Mechanic is mortified and taking some responsibility, but can't account for reason and is suggesting oil grade should be 0 to 40, not 5 to 40 as manual says and may have 'gummed up' cam shaft. I find this difficult to believe.
New valves have been fitted, but cylinder liners are intact with no coolant leakage.
Picking her up on 7 March and will inspect broken parts.
Cheers Don

SD1too · 5th March 2013, 11:26

Thanks for the update Don. I remember reading about one other instance of a camshaft breaking. If it was anything to do with the grade of engine oil, there would be many, many more failures.

Simon

kaiser · 5th March 2013, 13:55

If the camshaft is indeed broken, it is likely to be either lubrication related or fatigue. Barring a manufacturing defect
.

It will have nothing to so with the grade of oil. That's is a given.

But it could have to do with a general lack of oil. Either an oil loss generally, a problem with the pump, or may a blocked supply to some of the bearings on the cam.

Since these are furthest away from the pump, they will be the first to suffer, generally.

I would carefully ascertain if there is enough oil in the sump. Then check the relief valve, the oil filter and then the supply holes to the cam bearings.

Fatigue you will be able to spot looking carefully at the break. It will have two different looking surfaces. One where fatigue has worked its way, usually a matt surface, and then one where the final break has taken place, which will look fresh and be rough.

James.uk · 5th March 2013, 17:18

I would have thought that there would have been some warning noise prior to complete failure if the problem was a lack of oil supply...

...

24th January 2013, 19:54	#21
Jules This is my second home ZT 260 SE Twilight and 10 other 75 ZT's :O Join Date: Jan 2007 Location: Conwy NORTH WALES Posts: 11,094 Thanks: 512 Thanked 1,116 Times in 763 Posts	We cannot diagnose this with the given evidence so far. As Brian says maybe speak to Bruce first. He has many contacts in Oz . Are you a member of any British car clubs in Oz? __________________ [SIGPIC][/SIGPIC] Newbies do now!! 1. Plenum drains..all 3 or 4 year dependent 2. Cooling fan..All speeds functioning 3. Bonnet cable divider block

25th January 2013, 02:06	#22
Donthemac Newbie MG ZT Join Date: Jan 2013 Location: Melbourne Posts: 8 Thanks: 0 Thanked 0 Times in 0 Posts	timing belt the problem Just been informed timing belt is broken. Thanks for discussion. Hope it will also help others

25th January 2013, 08:00	#25
Jules This is my second home ZT 260 SE Twilight and 10 other 75 ZT's :O Join Date: Jan 2007 Location: Conwy NORTH WALES Posts: 11,094 Thanks: 512 Thanked 1,116 Times in 763 Posts	Agree with Simon. Further more the actual diagnosis has to be investigated further. ie Has the belt actually snapped or come off one of the pulleys out of view. How far did they strip it down? One would have to question either the workmanship or quantity of parts fitted. Is the plastic idler the cause and was the metal tensioner set up properly after the pin was removed. Were the new cam bolts under/overtightened? Were the bolts new?! Was the water pump the cause? Did the lower sprocket fail (very rare) Did a camshaft snap ?(also rare) __________________ [SIGPIC][/SIGPIC] Newbies do now!! 1. Plenum drains..all 3 or 4 year dependent 2. Cooling fan..All speeds functioning 3. Bonnet cable divider block

26th January 2013, 01:59	#26
Donthemac Newbie MG ZT Join Date: Jan 2013 Location: Melbourne Posts: 8 Thanks: 0 Thanked 0 Times in 0 Posts	still waiting... Yes, the person who did the work also doubts diagnosis and is travelling to assess for himself. He is indeed one of Melbourne's experts from the dealership. Waiting till Australia Day holiday is over. I will consider all the items suggested also, thanks

5th March 2013, 09:33	#27
Donthemac Newbie MG ZT Join Date: Jan 2013 Location: Melbourne Posts: 8 Thanks: 0 Thanked 0 Times in 0 Posts	mobile again but puzzled Did a camshaft snap ?(also rare) Yes Jules, it seems it did. I have not yet seen broken parts. Mechanic is mortified and taking some responsibility, but can't account for reason and is suggesting oil grade should be 0 to 40, not 5 to 40 as manual says and may have 'gummed up' cam shaft. I find this difficult to believe. New valves have been fitted, but cylinder liners are intact with no coolant leakage. Picking her up on 7 March and will inspect broken parts. Cheers Don

5th March 2013, 11:26	#28
SD1too Doesn't do things by halves Rover 75 2.5 Connoisseur Auto (1999) Dealer launch model. Join Date: Mar 2007 Location: Former Middlesex Posts: 20,442 Thanks: 1,587 Thanked 3,749 Times in 3,181 Posts	Thanks for the update Don. I remember reading about one other instance of a camshaft breaking. If it was anything to do with the grade of engine oil, there would be many, many more failures. Simon __________________ "Whatever is rightly done, however humble, is noble." Sir Henry Royce.

5th March 2013, 13:55	#29
kaiser This is my second home 75 Tourer 2.5 Auto, 1.8T, 75V8ZT Join Date: Jun 2007 Location: Johannesburg ZA Posts: 6,200 Thanks: 1 Thanked 859 Times in 613 Posts	If the camshaft is indeed broken, it is likely to be either lubrication related or fatigue. Barring a manufacturing defect . It will have nothing to so with the grade of oil. That's is a given. But it could have to do with a general lack of oil. Either an oil loss generally, a problem with the pump, or may a blocked supply to some of the bearings on the cam. Since these are furthest away from the pump, they will be the first to suffer, generally. I would carefully ascertain if there is enough oil in the sump. Then check the relief valve, the oil filter and then the supply holes to the cam bearings. Fatigue you will be able to spot looking carefully at the break. It will have two different looking surfaces. One where fatigue has worked its way, usually a matt surface, and then one where the final break has taken place, which will look fresh and be rough.

5th March 2013, 17:18	#30
James.uk Passed Away 2002 Pale Blue. Rover 75 CDTi Connoisseur auto. 170K miles Join Date: Dec 2008 Location: Near the M67. Posts: 14,509 Thanks: 199 Thanked 585 Times in 397 Posts	I would have thought that there would have been some warning noise prior to complete failure if the problem was a lack of oil supply... ...