Member Since: 13 Feb 2018
Location: Lincs
Posts: 7
Oil pump tensioner failed
Hi all,
I am new to this forum so hope this works out..
I have rebuilt a D3 07 after a oil pump tensioner failed. Replaced pump, timing belt, tensioner and cam bearing caps after they had been pushed up and sheared off.
Engine started but is lumpy and rough. Carried out compression test and read consistent 10 bar 145psi across all cylinders apart from one at 7 bar.
Does anybody know if this sounds normal with these test results?
Ghghhj
T
23rd May 2018 9:13 pm
rrhool
Member Since: 28 Aug 2014
Location: Norfolk
Posts: 4400
Oil pump tensioner? I guess you mean Cam Belt tensioner?
Jeez, if its pushed the cam caps off, I imagine the valves have hit the pistons to do that. I think you need to investigate deeper Richard
D3 SE 2007. Triumph 2.5Pi 1973. Ferguson TEA20 1948.
Discovery 2 4.0 ES 2001- Gone
Discovery 1 300Tdi ES '95 - Gone
Range Rover Classic '79 - Gone
23rd May 2018 9:31 pm
symonm
Member Since: 13 Feb 2018
Location: Lincs
Posts: 7
Hi Richard
Certainly there was some contact there. I have currently got the left passenger side head off and valves all ok, satisfactory leak test and piston all appear to be sound on the tops and all appear to reach tdc. I haven't removed the other side but have checked piston crowns with a camera and seem ok and all reaching tdc so feel are ok.
What do you make of the test results? Are they fair with an engine with 130k on it? It ran perfect before the tensioner failed.
Simon
23rd May 2018 10:11 pm
Disco_Mikey
Member Since: 29 May 2007
Location: Dundee, Scotland
Posts: 20728
Member Since: 07 Dec 2004
Location: Bramhall
Posts: 26701
I agree. My old 66 Series 2a petrol manages 165psi!!
23rd May 2018 10:17 pm
rrhool
Member Since: 28 Aug 2014
Location: Norfolk
Posts: 4400
Simon,
I just can't see how pushing the cam off, through its bearing cap, has not resulted in massive damage to the valves / pistons / little ends / possibly the big ends !
The cam itself must be damaged. Engine designers go to great lengths to ensure cam shafts are straight, and run true, and yours has incurred massive stresses at one point, while the rest of it was held still.
I think your low compression, and one offset compression is due to much more damage than you are seeing.Richard
D3 SE 2007. Triumph 2.5Pi 1973. Ferguson TEA20 1948.
Discovery 2 4.0 ES 2001- Gone
Discovery 1 300Tdi ES '95 - Gone
Range Rover Classic '79 - Gone
24th May 2018 11:25 am
Pete K
Member Since: 15 Jan 2016
Location: GL
Posts: 10362
fairly common for the cam caps to break on these engines.
I wouldn't be worried about the bottom end.
If it were me I would be tempted to fit a 2nd hand head, as they are only £100 off ebay (including cams if you look hard enough)
Last edited by Pete K on 24th May 2018 6:19 pm. Edited 1 time in total
24th May 2018 12:14 pm
hugeviking
Member Since: 08 Jun 2010
Location: cotswolds
Posts: 1482
Cam lobes rotated around camshaft ?
Andi.
24th May 2018 1:17 pm
PROFSR G
Member Since: 06 Mar 2017
Location: Lost
Posts: 4651
rrhool wrote:
Simon,
I just can't see how pushing the cam off, through its bearing cap, has not resulted in massive damage to the valves / pistons / little ends / possibly the big ends !
The cam itself must be damaged. Engine designers go to great lengths to ensure cam shafts are straight, and run true, and yours has incurred massive stresses at one point, while the rest of it was held still.
I think your low compression, and one offset compression is due to much more damage than you are seeing.
Hi Simon,
If the cam bearing caps are broken the camshaft must have lifted. As its solid cast, it too will likely be cracked if not broken. Compression ratio is over 17-1 so you're readings are too low. You might have escaped bottom end damage but if you replace/repair the entire top end, how will you feel when it comes to turning the key for the first time? If it was my engine I'd be lifting it out and either replace, or full rebuild. rrhool is bang on in my view.
24th May 2018 4:06 pm
hugeviking
Member Since: 08 Jun 2010
Location: cotswolds
Posts: 1482
I had the cam chain snap.
I had all new valves in both heads (only one or two were obviously damaged)and one new camshaft, these are now tubes with the cams pressed onto them, and new chains/tensioners. However the cam bearing caps had not lifted and perhaps more importantly ?? the chain broke at tick over.
Perhaps time will tell about the bottom end but this happened about 30,000 miles ago.
24th May 2018 6:11 pm
Pete K
Member Since: 15 Jan 2016
Location: GL
Posts: 10362
It's far from easy or cheap to remove these engines and recon the bottom end.
If it's running (and he has had it running) best to leave the bottom end alone.
24th May 2018 6:22 pm
Pete K
Member Since: 15 Jan 2016
Location: GL
Posts: 10362
Member Since: 06 Mar 2017
Location: Lost
Posts: 4651
Pete K wrote:
It's far from easy or cheap to remove these engines and recon the bottom end.
If it's running (and he has had it running) best to leave the bottom end alone.
It was indeed running in the video Pete but it appears the bank with broken chain would have had its pistons trying to copulate with the valves at some point, if not continuously. That doesn't bode well for con rods and pistons looking at the video, whatever about the big ends and mains.
24th May 2018 7:02 pm
PROFSR G
Member Since: 06 Mar 2017
Location: Lost
Posts: 4651
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