Engine: D5: - V70 Head Off Soon Bent Valve Jobby

Roy wolverhampton · Jul 10th, 2012, 10:58

engine D5
Posted the other day about my v70 2003 D5 having running problems. Have decided to strip the plenum pipes and clean them out ,all intake pipes and aluminium intake cover from the top of engine. Now at the point for head off to check for either 1, cracked head
2, Head gasket gone
3, Valves on all 5 cylinders bent
This is the list of probable causes to 200 psi compression in all 5 cylinders and no revs above '1200' rmp. E,C,U clear only electronic fault is the M,A,F sensor but got that sorted.

Done the obvious tests on injectors ect so just leaves mechanical failiure

will keep you posted (if any one is reading this)

Brendan W · Jul 10th, 2012, 12:18

Presume the compression test was done wet and dry to eliminate ring wear. You might have burned exhaust valves/seats or insufficient clearance on the valves. Late timing might burn valves/seats but not contact the pistons and if the seats have burned away a bit the clearance could have gone to zero. I would check valve clearance and stem height if possible before taking off the head.

Roy wolverhampton · Jul 14th, 2012, 15:15

will check this sunday when I start job. will take pics if poss and if obvious damage or ware

Roy wolverhampton · Jul 16th, 2012, 17:15

Took the head off my d5 on sunday. Not good news valves look ok bottom end all good but all 10 inlet side tapet housing that are part of the head casting are sheared away. will put photos on later. Have seen on youtube a video that some clever sod has tig welded the damaged area then re milled new holes for the tapet,just wandering if anyone has a view on how reliable this could be?

Kevkvs · Jul 17th, 2012, 14:39

Have you got any picks as I'm about to take my d5 head off,
How did it go as I haven't done one before,
Regards

Roy wolverhampton · Jul 19th, 2012, 16:19

have got pics must down size as too high quality to upload.
Just go by the book for the correct head bolt removal sequence as it can warp the head if done wrong. My head was knacked and have just sourced a block and head that I am collecting Friday and hopefully after full inspection and removal from the donor engine will be re-coned by me and fitted next weekend.Still need new gaskets and head bolts ect.
My tappet seat problem aparently is such a precise engineering job to weld then mill I have bitten the expensive bullet and am renewing the head. The bonus with this is that I can check every detail on the head and valves before it goes back on and 3 of my roller rockers were damaged so I will have lots of spares including a bottom end that has done 90k. Will post with the fun details on completion.

Jul 10th, 2012, 10:58	#1
Roy wolverhampton New Member Last Online: Jul 30th, 2014 23:21 Join Date: Jul 2012 Location: wolverhampton	V70 Head Off Soon Bent Valve Jobby engine D5 Posted the other day about my v70 2003 D5 having running problems. Have decided to strip the plenum pipes and clean them out ,all intake pipes and aluminium intake cover from the top of engine. Now at the point for head off to check for either 1, cracked head 2, Head gasket gone 3, Valves on all 5 cylinders bent This is the list of probable causes to 200 psi compression in all 5 cylinders and no revs above '1200' rmp. E,C,U clear only electronic fault is the M,A,F sensor but got that sorted. Done the obvious tests on injectors ect so just leaves mechanical failiure will keep you posted (if any one is reading this)

Jul 14th, 2012, 15:15	#3
Roy wolverhampton New Member Last Online: Jul 30th, 2014 23:21 Join Date: Jul 2012 Location: wolverhampton	Fair enough will check this sunday when I start job. will take pics if poss and if obvious damage or ware

Jul 16th, 2012, 17:15	#4
Roy wolverhampton New Member Last Online: Jul 30th, 2014 23:21 Join Date: Jul 2012 Location: wolverhampton	Hydraulic tapet housings destroyed Took the head off my d5 on sunday. Not good news valves look ok bottom end all good but all 10 inlet side tapet housing that are part of the head casting are sheared away. will put photos on later. Have seen on youtube a video that some clever sod has tig welded the damaged area then re milled new holes for the tapet,just wandering if anyone has a view on how reliable this could be?

Jul 10th, 2012, 12:18	#2
Brendan W Premier Member Last Online: Apr 2nd, 2024 19:50 Join Date: Dec 2007 Location: Wexford	Presume the compression test was done wet and dry to eliminate ring wear. You might have burned exhaust valves/seats or insufficient clearance on the valves. Late timing might burn valves/seats but not contact the pistons and if the seats have burned away a bit the clearance could have gone to zero. I would check valve clearance and stem height if possible before taking off the head.

Jul 17th, 2012, 14:39	#5
Kevkvs Junior Member Last Online: Apr 2nd, 2014 08:59 Join Date: Feb 2012 Location: Milton Keynes	Have you got any picks as I'm about to take my d5 head off, How did it go as I haven't done one before, Regards

Jul 19th, 2012, 16:19	#6
Roy wolverhampton New Member Last Online: Jul 30th, 2014 23:21 Join Date: Jul 2012 Location: wolverhampton	have got pics must down size as too high quality to upload. Just go by the book for the correct head bolt removal sequence as it can warp the head if done wrong. My head was knacked and have just sourced a block and head that I am collecting Friday and hopefully after full inspection and removal from the donor engine will be re-coned by me and fitted next weekend.Still need new gaskets and head bolts ect. My tappet seat problem aparently is such a precise engineering job to weld then mill I have bitten the expensive bullet and am renewing the head. The bonus with this is that I can check every detail on the head and valves before it goes back on and 3 of my roller rockers were damaged so I will have lots of spares including a bottom end that has done 90k. Will post with the fun details on completion.

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