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Andy lander
Joined: 07 May 2019 Posts: 30 Location: Croydon
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Posted: Mon Jun 03, 2019 13:00 Post subject: Timing chain tensioner |
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Hi all
I am after a bit of info regarding the timing chain tensioner on my 1997 L400 Delica 2.8td
I have an oil leak which I believe I have traced to be coming from the above mentioned timing chain tensioner, if I undo the two bolts, remove and replace the assumed knackered gasket is there a specific way to reassemble the tensioner to ensure it locates/tensions the chain correctly? Is it best to do this with the rocker cover removed?
Thanks in advance
Andy |
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Posted: Mon Jun 03, 2019 13:00 Post subject: Google Ads keep this community free to join! |
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YOZA
Joined: 07 Mar 2005 Posts: 2423 Location: The centre of the universe
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Posted: Mon Jun 03, 2019 13:18 Post subject: |
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The timing chain tensioner is a plunger type which is on a one way ratchet, it will extend but it won’t retract.
It is fed by oil and oil pressure extends it against the timing chain guide.
When you replace a new one it has a small hook keeping the plunger retracted, and when it’s fitted the timing chain strikes the hook when engine is rotated and allows it to open and extend via oil pressure. _________________ Artificial intelligence is no match for natural stupidity.... |
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Andy lander
Joined: 07 May 2019 Posts: 30 Location: Croydon
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Posted: Mon Jun 03, 2019 19:49 Post subject: |
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Many thanks Yoza for your prompt and helpful reply |
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Lewis Site Admin
Joined: 25 May 2006 Posts: 16291 Location: Huddersfield
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Posted: Mon Jun 03, 2019 22:42 Post subject: |
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Tensioner with hook latched, fit with the hook underneath facing upwards. i.e. with the pin facing the backend of the engine.
Tensioner after hook has dropped when a new chain was fitted.
HTH _________________
Copyright is retained for all my photos. Please don't copy them without asking permission
Do not blindly go where the path may lead you. Go where there is no path and leave a trail that others may follow!
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Andy lander
Joined: 07 May 2019 Posts: 30 Location: Croydon
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Posted: Tue Jun 04, 2019 13:41 Post subject: |
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Thanks for your kind help Lewis |
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mark3
Joined: 29 Nov 2009 Posts: 905 Location: Rainham Village, Essex
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Posted: Wed Jun 05, 2019 12:26 Post subject: |
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I would suggest its best to remove the cam cover so you know the chain on the tensioner side (the slack side) is indeed slack otherwise inserting the tensioner into its orifice with the chain tight will unhook the tensioner and cause issues inserting it all the way, once in and bolts are tight press the pad in with your finger (or thumb) and allow i to extend on its own, DO NOT offer any assistance to it extending or the chain will be too tight and not last very long at all, i like to do it this way, manually, so i can make sure it extends correctly, refit the cam cover and Bobs your uncle
Turn the engine over by hand slowly until the chains slack side is indeed slack then you can insert the tensioner safely knowing it won't unhook and spring out.
The tensioner is primarily extended by an internal spring to hold the slipper pad against the chain, the ratchet teeth leave around 1mm of play as some give is required but this is cushioned by engine oil pressure once its running, also it Can't be installed the wrong way up as the bolt holes are off centre _________________
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Andy lander
Joined: 07 May 2019 Posts: 30 Location: Croydon
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Posted: Thu Jun 06, 2019 10:07 Post subject: |
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Hi Mark3
Thank you for your in depth help
I will let you all know how it goes on Sunday.
On another connected note is there any common places prone to oil leaks.. I know it's a long shot! I am hoping it's just coming from the knackered tensioner gasket as previously described.. as I look at the engine I have quite a bit of oil on the right hand side/tensioner area and some accumulates underneath onto the anti roll bar and then floor!
Thanks again all for your kind help and time
I will also get some pics of my Delica uploaded for those that are interested.
Kind regards
Andy |
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Deker
Joined: 08 Mar 2008 Posts: 3833 Location: Borehamwood
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Posted: Thu Jun 06, 2019 21:18 Post subject: |
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Most common oil leak/s are from the rocker cover, and the semi circular rubber seals at both ends.
Often includes the seals under the rocker cover bolts.
Very common is the Oil Pressure switch leaking - Cheap N easy to replace - 1/8th BSP tapered thread.
HTH
Mr D |
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andyman
Joined: 08 Dec 2012 Posts: 5601 Location: Penrith
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Posted: Fri Jun 07, 2019 23:37 Post subject: |
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Could the tensioner piston seal be leaking? Or the shaft seal behind the bottom pulley? _________________ Andy C L300 Super Exceed - over 100 smiles per gallon! |
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Andy lander
Joined: 07 May 2019 Posts: 30 Location: Croydon
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Posted: Sat Jun 08, 2019 9:22 Post subject: |
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Many thanks Andyman & Deker
I will be pulling it apart tomorrow to change the tensioner & gasket and hopefully get to the bottom of the leak!
Will let you know... |
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mark3
Joined: 29 Nov 2009 Posts: 905 Location: Rainham Village, Essex
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Posted: Sat Jun 08, 2019 12:37 Post subject: |
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andyman wrote: |
Could the tensioner piston seal be leaking? |
There is no seal in the tensioner. _________________
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Andy lander
Joined: 07 May 2019 Posts: 30 Location: Croydon
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Posted: Sun Jun 09, 2019 15:06 Post subject: |
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Hi All
I replaced the timing chain tensioner and also the rocker cover gasket and rubber end seals & bolt seals
All back up and running and hopefully oil leak solved!
Thanks again for all your advice
Pics to follow asap |
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mark3
Joined: 29 Nov 2009 Posts: 905 Location: Rainham Village, Essex
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Posted: Mon Jun 10, 2019 11:04 Post subject: |
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Well done _________________
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Andy lander
Joined: 07 May 2019 Posts: 30 Location: Croydon
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Posted: Mon Jun 10, 2019 20:16 Post subject: |
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Thanks for your advice mate |
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