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roy4matra
YaBB God
Posts: 1199
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« Reply #2 on: July 24, 2014, 06:40:29 pm » |
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Went to start the Espace the other day and the starter motor appeared to have given up. OK, fair enough, after 122k miles the original motor had given up. Symptoms were no flywheel drive and a clatter. So ordered a recon motor, fitted it and the same thing - initially - now it does drive the flywheel and indeed has been proven as turning the engine over as I can out in gear, and slip the clutch and the car will try and move. All good but it won't start! I am suspecting fuel starvation rather than timing or lack of it. If I let the pump prime and then try and start I get a momentary bit of enthusiasm from the engine then it just flies over.
I have now fuel pressure gauge to test but wondered what else I could check for? Ideas and suggestions gratefully received...
The very first thing is I'm not sure about you testing fuel pressure at all. These Common Rail diesels run huge pressures - they require 250 - 300 bar just to idle and can run up to 1400 bar. You are not allowed to disconnect a fuel line whilst the engine is running because of the danger of such high pressures and the possibility of fuel being pushed into the blood through the skin. Also if you disconnect any joint you must clean all around first and it should immediately have seal caps put on the two open ends, and you are supposed to replace any pipes disconnected with new, because they have to be torqued up and the seal formed will never be exactly the same a second time. The injector nozzle holes are less than a quarter of the diameter of a human hair and even extremely tiny dirt can get in the system and cause blockages. Fuel pressures are measured on Clip electronically, not with any physical gauge. Does your gauge even have the range to measure these sort of pressures? The low pressure (electrical) pump draws the fuel from the tank and passes it to the high pressure (mechanical) pump which raises it to the huge pressures required for the engine to run. We used to get problems where the low pressure pump was failing and not delivering sufficient fuel for the high pressure pump. On cranking the Clip showed about 148 bar - very high by old diesel standards (they used to run at around just 185 psi) but not sufficient to even allow these common rail diesels to start or idle. You really should get a Clip test first to see what pressure you have. Roy
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« Last Edit: July 24, 2014, 06:43:31 pm by roy4matra »
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BrianM
Sr. Member
Posts: 325
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« Reply #13 on: November 02, 2014, 02:09:28 pm » |
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Hi, sorry not to have been around, computer failure, no internet, work, illness. You name it i got it. Anyway, I think you have a broken rocker shaft. I have just done one. It would start on 2 cyls. but clattered & was noisy from the air intake. I have another one here with a similar mis-fire & clatter that happened after the crank pulley fell off. You need to remove the injectors & inlet manifold. Not a big job. I found that one of the bolts that held the shaft in place was broken & that the threads of the other bolts holding the shaft in place had stripped in the head. The rockers were lifting the shaft up & down instead of opening the valves fully. I got a second hand shaft & gasket set, cleaned the injectors with paint stripper & an ultrasonic bath. Shaft went back in with stainless steel studs & lock tight threadlock. There is a further 10mm of thread beyond the length of bolts that were stripped. Runs a beauty now With the top off you can get to the glow plugs with no problem. This one starts fine on two that work. Catch me on skype now I'm back up & running.
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« Last Edit: November 02, 2014, 03:12:18 pm by BrianM »
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Valfrid
Jr. Member
Posts: 39
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« Reply #14 on: November 08, 2014, 04:48:28 pm » |
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Hi Brian. Had the garage take a look and they are saying the same as you and I that basically the timing is out. 1 cylinder has no compression at all and it appears to actually only be firing on one cylinder. Don't have the time nor money to invest in the Espace anymore so have put it on Ebay as a spares or repair - http://www.ebay.co.uk/itm/201208191567?ssPageName=STRK:MESELX:IT&_trksid=p3984.m1555.l2649. If anyone's interested, the listing ends tonight so be quick! Thanks for all your help Brian and also to Roy too - you've both been great.
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