 | Home > Td5 > Excessive crankcase pressure |
 
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| ARC99 Member Since: 19 Feb 2013 Location: North Yorkshire Posts: 1831   
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Strange but to answer you question I'll ask one.
Does the engine have a crankcase breather that could be blocked? Don't make old people mad. We don't like being old in the first place, so it doesn't take much to  us off.
Richard |
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16th Sep 2013 7:46pm |
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| S3dxm Member Since: 17 Aug 2013 Location: York Posts: 82 
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Due to the amount of oil mist and residue in the turbo I'd day it was clear.
Even with the breather removed there is a definate puff of smoke when one of the cylinders "fires".... Kin thing......  2006 110 CSW Td5
2004 D3 HSE 1992 200Tdi 90 project 1975 SWB S3 even bigger project |
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16th Sep 2013 7:53pm |
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| Steve B Member Since: 22 May 2009 Location: Warwickshire Posts: 586 
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Diesels due to their high cylinder pressures breath more than petrol.
Unless its leaking oil from seals/gaskets I wouldn't worry.  |
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17th Sep 2013 7:05pm |
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| S3dxm Member Since: 17 Aug 2013 Location: York Posts: 82
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I would consider it excessive though.
Compared to my mums Td5 90, my dads Td5 90, and a friends Td5 Disco (even with 180000 on clock) - mine smokes from the filler and dipstick more than any of those. 2006 110 CSW Td5 2004 D3 HSE 1992 200Tdi 90 project 1975 SWB S3 even bigger project |
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17th Sep 2013 7:12pm |
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| Steve B Member Since: 22 May 2009 Location: Warwickshire Posts: 586
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Did you replace the gasket with the same thickness?
Why did you take the head off? What oil are you using? Is there diesel in the oil? What does the blowby smell like? Diesel/oil Try catching it in a can to see how much oil is in it, Blank off the pre turbo pipe. Like you say if it's different to others it's obviously breathing more, maybe if your gasket went , I am guessing this is why you had the head off? water has damaged the bore. Did you inspect it on the rebuild for wear? If you get some kitchen wipe drop oil on it, if there is a second ring there maybe diesel in the oil. Maybe it's not blowby but diesel from a leaking seal or cracked head. Sorry for loads of question but gives you some thing to think about. |
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17th Sep 2013 7:26pm |
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| S3dxm Member Since: 17 Aug 2013 Location: York Posts: 82
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Think I may be on to something now.......
Started at 10am this morning, by 13:00 I had the following results..... Removed head..... Again....... 
Decided to remove sump, oil pump etc. and remove con rod/pistons...... Looks like the old girl has been overheated at some point, two pistons are somewhat scored/damaged, one has the rings in a "stuck" position (not moving in the groove), therefore thinking this is what may be causing the blowing.... So my shopping bill is adding up. Pair of new pistons, Set of 5 new rings, New. big end shells, New head bolts, New head gasket, New sump gasket, And the mandatory bucket of swear words to go with scraped knuckles etc..... So things my be looking positive, even if my wallet is somewhat decreasing in size......  2006 110 CSW Td5
2004 D3 HSE 1992 200Tdi 90 project 1975 SWB S3 even bigger project |
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18th Sep 2013 7:20pm |
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| S3dxm Member Since: 17 Aug 2013 Location: York Posts: 82
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And today's update:
All parts delivered. Cylinders honed. New pistons fitted on rods New rings fitted New big end shells fitted. Ready for assembly weather permitting... Click image to enlarge Click image to enlarge Click image to enlarge Said damaged pistons.... Fingers crossed the rebuild sorts everything out...  2006 110 CSW Td5
2004 D3 HSE 1992 200Tdi 90 project 1975 SWB S3 even bigger project |
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19th Sep 2013 7:37pm |
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| Steve B Member Since: 22 May 2009 Location: Warwickshire Posts: 586
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You have been busy
Good job  |
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19th Sep 2013 7:59pm |
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| S3dxm Member Since: 17 Aug 2013 Location: York Posts: 82
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Fingers crossed all the work pays off!!! 2006 110 CSW Td5
2004 D3 HSE 1992 200Tdi 90 project 1975 SWB S3 even bigger project |
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19th Sep 2013 8:13pm |
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| Lou Sparts Member Since: 15 Apr 2012 Location: Kent Posts: 1501 
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Not pretty but it,s always nice to find a fault that fits in with your symptoms.
2005 Td5 90 XS
Steve |
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19th Sep 2013 9:14pm |
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| fab.rob Member Since: 03 Nov 2018 Location: Wokingham Posts: 29 
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I have a high crank pressure. All started whilst away in Devon when the engine lost power and had a puff of smoke into the cabin through the vent. Limped to a garage who arranged for a relay home. £450 later back to Berkshire. Started investigation, initial fault showed as turbo power train issue and loss of compression cylinder 2. Cleared faults and started engine, running very lumpy/miss-firing. Traced fault to failure of injector on cylinder 4 coil failure. Have noticed during this that there is a significant amount of pressure when you remove oil filler cap, enough to spray oil out high enough to hit underside of bonnet, but this was also occurring prior to the breakdown. So now awaiting a second hand VDO Siemens injector. Hopefully this will resolve the misfire but not sure it will cure the high pressure issue. Can you tell me how difficult it was to replace the pistons, rings, big ends etc?
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24th Nov 2021 5:41pm |
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| geobloke Member Since: 06 Nov 2012 Location: Nottinghamshire Posts: 4410
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It is not difficult, but a decent sized garage out of the weather is almost essential. It would also ultimately be much more comfortable to do the piston swap outside the vehicle on an engine stand. Then doing the work in a standard home garage would be possible.
Apart from that, decent tools, working methodically and cleanliness are key. Also be prepared to check all engine components whilst you can and replace/clean/refurb as necessary. I would love to rebuild a TD5 engine back to nearly new, balancing the pistons, etc. would be a super Winter project... Just need a garage and spare engine now  |
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24th Nov 2021 6:19pm |
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| fab.rob Member Since: 03 Nov 2018 Location: Wokingham Posts: 29
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Would love a crack myself but my workshop is dedicated to wood turning with resin and wood. Have a car port but there is no concrete floor, oy earth
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24th Nov 2021 6:31pm |
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| geobloke Member Since: 06 Nov 2012 Location: Nottinghamshire Posts: 4410
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I feel your pain there, but at least you have a car port my friend
Doing a head swap outside was not my favourite way to do delicate work. Also, I too would definitely not do anything DIY mechanicky in a wood shop |
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24th Nov 2021 6:35pm |
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