Member Since: 25 Apr 2020
Location: Vale of glamorgan
Posts: 6
Timing problem
Hello everyone I'm new here and I need some advice on the timing sequence. I have a 2008 discovery 2.7 tdv6. Admittedly I bought it with this issue but I thought it was a duff injector or 2. So when I managed to get it home and start investigating the problem it was actually chuffing coming from the air box. I'll cut a long story short. I've removed the rocker cover from the right bank where the noise was coming from and on further inspection after inserting all the timing pins I think I've found the issue, from the timing Mark's turning the crank the exhaust valve is opening instead of the inlet valve. Can someone please help me. Thank you Lewis.
25th Apr 2020 5:23 pm
PROFSR G
Member Since: 06 Mar 2017
Location: Lost
Posts: 5090
I have heard of the cam lobes slipping on these but never came across it personally. Even so, I would be doubtful that is the case here. What direction are you turning the engine?yµ (idµ - eAµ) ψ=mψ
25th Apr 2020 5:44 pm
Lewise86
Member Since: 25 Apr 2020
Location: Vale of glamorgan
Posts: 6
Hello PROFSR G I wouldn't have said that it has slipped as they are all in sync just opening in the wrong order. I'm rotating it clockwise.
Lewis
25th Apr 2020 5:48 pm
Pete K
Member Since: 15 Jan 2016
Location: GL
Posts: 10768
Do the timing pins go in on both heads
Maybe the cam sprocket has been fitted to the cam incorrectly.
25th Apr 2020 5:56 pm
Lewise86
Member Since: 25 Apr 2020
Location: Vale of glamorgan
Posts: 6
Hello pete K yes the flywheel and the left bank almost fall in and the right bank is a tad on the tight side but all locked in. I'm struggling to make sense of it.
Thanks Lewis
25th Apr 2020 5:59 pm
Lewise86
Member Since: 25 Apr 2020
Location: Vale of glamorgan
Posts: 6
Pete K wrote:
Do the timing pins go in on both heads
Maybe the cam sprocket has been fitted to the cam incorrectly.
Hello pete K, is it possible that the cam sprocket can be fitted incorrectly?
Thaks again
25th Apr 2020 6:03 pm
Disco_Mikey
Member Since: 29 May 2007
Location: Dundee, Scotland
Posts: 20867
If the belt/tensioner/oil pump have failed, and the valves and valves have collided, that could cause the lobes to spin
If you've bought the car with that issue, then it could have already been repaired with new caps, bolts, rockers etc already, found they couldn't get it going, and sold it on as a non runner
Member Since: 06 Mar 2017
Location: Lost
Posts: 5090
OK so just to be certain you have identified everything correctly
The firing order is 1 4 2 5 3 6. Cylinders 1 to 3 are on the right bank with No'1 at the front of the engine and No'3 nearest the windscreen. Cylinders 4 to 6 are left bank with No'4 at the front and No'6 nearest the windscreen.
(As viewed from the Drivers seat!!)yµ (idµ - eAµ) ψ=mψ
25th Apr 2020 6:07 pm
Lewise86
Member Since: 25 Apr 2020
Location: Vale of glamorgan
Posts: 6
Yes that's correct
25th Apr 2020 6:13 pm
PROFSR G
Member Since: 06 Mar 2017
Location: Lost
Posts: 5090
In that case you're going to be busy for a while. The cam lobes are sweated on so it might be they have moved. There's only one way to find out but there is plenty of help on here yµ (idµ - eAµ) ψ=mψ
25th Apr 2020 6:17 pm
Lewise86
Member Since: 25 Apr 2020
Location: Vale of glamorgan
Posts: 6
I'll order a new set of cams to compare but I find it hard to believe that each set of lobes have slipped perfectly and kept within timing with each other. It's as if something had been put back wrong and the exhaust valve is opening when the inlet should and vice versa. The cam pulley can only go on one way so that rules out that. We shall have to see what happens. Thanks anyway. Lewis
26th Apr 2020 7:00 am
aja4x4
Member Since: 14 Apr 2019
Location: Westbury
Posts: 2463
It could be as simple as a bent valve or valves.
I have had a Nissan engine that the timing belt failed and it was repaired cheaply by a garage that i didnt know about.
It started and ran ok but the tickover was lumpy and it misfired when reved from tickover. A compression test showed low compression on cylinders 2 and 3 so i took the head off thinking it would be a head gasket failed but instead found all four inlet valves very slightly bent and the tell tell marks on top of the pistons.
26th Apr 2020 7:46 am
MikeBob
Member Since: 19 Sep 2016
Location: Pretoria
Posts: 118
Quite often the key on the vibration damper on drivers side cam breaks off. That would make your timing wrong. Also the gear the chain runs on is prone to moving. There is a line on the cam so are able to check if it has moved
26th Apr 2020 8:30 am
lynalldiscovery
Member Since: 22 Dec 2009
Location: Maidstone
Posts: 7274
You cannot post new topics in this forum You cannot reply to topics in this forum You cannot edit your posts in this forum You cannot delete your posts in this forum You cannot vote in polls in this forum
