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Timing chain tensioner


 
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Andy lander



Joined: 07 May 2019
Posts: 14
Location: Croydon

PostPosted: Mon Jun 03, 2019 13:00    Post subject: Timing chain tensioner Reply with quote

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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YOZA



Joined: 07 Mar 2005
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PostPosted: Mon Jun 03, 2019 13:18    Post subject: Reply with quote

The timing chain tensioner is a plunger type which is on a one way ratchet, it will extend but it wonít 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 itís fitted the timing chain strikes the hook when engine is rotated and allows it to open and extend via oil pressure.
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Andy lander



Joined: 07 May 2019
Posts: 14
Location: Croydon

PostPosted: Mon Jun 03, 2019 19:49    Post subject: Reply with quote

Many thanks Yoza for your prompt and helpful reply
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Lewis
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Joined: 25 May 2006
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Location: Huddersfield

PostPosted: Mon Jun 03, 2019 22:42    Post subject: Reply with quote

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
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Andy lander



Joined: 07 May 2019
Posts: 14
Location: Croydon

PostPosted: Tue Jun 04, 2019 13:41    Post subject: Reply with quote

Thanks for your kind help Lewis
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mark3



Joined: 29 Nov 2009
Posts: 789
Location: Rainham Village, Essex

PostPosted: Wed Jun 05, 2019 12:26    Post subject: Reply with quote

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  Laughing

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  Very Happy
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Andy lander



Joined: 07 May 2019
Posts: 14
Location: Croydon

PostPosted: Thu Jun 06, 2019 10:07    Post subject: Reply with quote

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
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Joined: 08 Mar 2008
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Location: Borehamwood Hertfordshire

PostPosted: Thu Jun 06, 2019 21:18    Post subject: Reply with quote

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

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andyman



Joined: 08 Dec 2012
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Location: Penrith, Cumbria

PostPosted: Fri Jun 07, 2019 23:37    Post subject: Reply with quote

Could the tensioner piston seal be leaking? Or the shaft seal behind the bottom pulley?
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Andy lander



Joined: 07 May 2019
Posts: 14
Location: Croydon

PostPosted: Sat Jun 08, 2019 9:22    Post subject: Reply with quote

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: 789
Location: Rainham Village, Essex

PostPosted: Sat Jun 08, 2019 12:37    Post subject: Reply with quote

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: 14
Location: Croydon

PostPosted: Sun Jun 09, 2019 15:06    Post subject: Reply with quote

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
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Location: Rainham Village, Essex

PostPosted: Mon Jun 10, 2019 11:04    Post subject: Reply with quote

Well done †Very Happy
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Andy lander



Joined: 07 May 2019
Posts: 14
Location: Croydon

PostPosted: Mon Jun 10, 2019 20:16    Post subject: Reply with quote

Thanks for your advice mate
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