|
||
|
29th May 2013, 17:37 | #1 |
Newbie
MG ZT Join Date: May 2013
Location: London
Posts: 1
Thanks: 0
Thanked 2 Times in 1 Post
|
Rover 75/ MG ZT CDTi not starting
After years of using this forum to keep my cars running I thought it was time to contribute and maybe help shorten the pains of somebody with the dreaded diesel not starting problem.
My ZT was running and starting fine until it suddenly began having problems firing. The engine would turn but not fire. My tale of woe then went on for a couple of months. Reading the forum suggestions I decided it was the in tank pump so replaced it. That made no difference. I noticed a whooshing noise coming from the diesel high pressure pump when turning on the ignition key but not turning over the engine so I wondered if air was being pumped into it. Fuel was pumping out of the under bonnet pump with a fair pressure but I did notice it looked aerated. After following that red herring for a while I now believe that was caused by the under bonnet pump sucking faster than the in tank pump can push. During all this attempted starting I decided the battery had failed so replaced that (I now have a perfectly good spare battery) and the starter motor solenoid contacts burnt out so I replaced them. Somehow after all this the car was starting ok but no explanation why. Until it stopped starting ok and would only start with easy start. After starting it ran fine. After more forum trawling I found FrennchMikes description of how to measure low and high fuel pressures. http://www.the75andztclub.co.uk/foru...ad.php?t=69308 My low pressure was fine but the high pressure never went past 0.6v showing I had a high pressure leak. Resisting the urge to send off the injectors for service I tried a leakback test which showed no fuel leaking back when cranking (I now know there was no leakback because there was no fuel pressure to cause them to leak). All the joints were tight with no apparent fuel leaking. Then I found mention of the high pressure regulator solenoid. I removed the regulator solenoid which is bolted to the high pressure pump by two hex bolts and voila a destroyed ‘O’ ring fell out. A picture of said failed part should go here but I cannot work out how to post it. The regulator is easy to remove after removing the plastic inlet manifold. A repair kit CMR1700-9 was ordered from http://www.darwendiesels.com for the princely sum of £2.60 and now fitted the car starts first time every time. Bit of a long story I know but it was longer in real time. Hope it helps somebody. Many thanks to FrenchMike for the fuel pressure diagnostics guide. |
29th May 2013, 17:53 | #2 | |
This is my second home
Rover 75 Saloon Join Date: Aug 2007
Location: Avignon
Posts: 4,466
Thanks: 94
Thanked 661 Times in 554 Posts
|
Quote:
Very pleased having helped you to be sorted Could be useful for others to add in the 'how to' what you have done ? Mike |
|
29th May 2013, 18:31 | #3 |
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
|
Certainly usefull information innit.. Thank you.
... |
29th May 2013, 20:30 | #4 |
This is my second home
None Join Date: Feb 2013
Location: None
Posts: 5,556
Thanks: 465
Thanked 1,161 Times in 924 Posts
|
Another thing to check when diagnosing non-starting problems. Well done in sorting it!
Heddy. |
16th February 2015, 12:45 | #5 | |
Gets stuck in
Rover 75 CDT Club Tourer Join Date: Apr 2007
Location: Norwich
Posts: 712
Thanks: 98
Thanked 47 Times in 24 Posts
|
Quote:
|
|
16th February 2015, 13:05 | #6 |
Loves to post
we have a 75 connoisseur cdt se saloon and a 75 conniosser se cdt tourer Join Date: Dec 2013
Location: Romford
Posts: 492
Thanks: 177
Thanked 62 Times in 52 Posts
|
Hello I will go out and take a photo for you as I have the same problems
__________________
I have been driving for 20 years and most of it is in rovers [SIGPIC][/SIGPIC] |
16th February 2015, 15:24 | #7 |
MG ZT Join Date: Jan 2011
Location: Newcastle Upon Tyne
Posts: 20,151
Thanks: 3,565
Thanked 10,837 Times in 5,718 Posts
|
|
16th February 2015, 15:28 | #8 | |
MG ZT Join Date: Jan 2011
Location: Newcastle Upon Tyne
Posts: 20,151
Thanks: 3,565
Thanked 10,837 Times in 5,718 Posts
|
Quote:
The HP regulator is bolted onto the right hand side of the injection pump as you look at the car from the front. The bolts are T20 torx IIRC. The pump itself is mounted above the alternator, just look for the shiny stainless 8mm diesel pipe, in fact the pipe can be seen in this picture behind the dipstick.... Not a bad job, if a bit fiddly. Brian Last edited by marinabrian; 16th February 2015 at 15:31.. |
|
16th February 2015, 15:54 | #9 |
Loves to post
we have a 75 connoisseur cdt se saloon and a 75 conniosser se cdt tourer Join Date: Dec 2013
Location: Romford
Posts: 492
Thanks: 177
Thanked 62 Times in 52 Posts
|
Dam you good sir
__________________
I have been driving for 20 years and most of it is in rovers [SIGPIC][/SIGPIC] |
16th February 2015, 16:01 | #10 |
Gets stuck in
Rover 75 CDT Club Tourer Join Date: Apr 2007
Location: Norwich
Posts: 712
Thanks: 98
Thanked 47 Times in 24 Posts
|
Thanks for that - I'll go out and take another look.
|
|
|