All Things MK6 R and GTI > MK6 General Area

Chain tensioner

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Snoopy:
Something I wrote 9 years ago now.  :surprised:

Tensioner revisions.
Revision 1 engines built fom 17 May 2010
Revision 2 engines built from December 2011.
Revidion 3 engines built from 01 May 2012.


What happens.
I'll keep this short.

. The tensioner on the camshaft chain tensions by oil pressure.
. When the car has no or low oil pressure (car stood overnight or during work day) the tensioner falls back on its ratchet to keep tension on the timing chain.
. Its the ratchet that fails in the tensioner, therefore releasing tension on the chain.
. When you go to start the car, the chain is slack as the ratchet has failed.
. The chain moves on the sprockets and moves a couple of teeth before oil pressure builds and tensions the chain once again, but sadly in the wrong location as its moved teeth on one or more of the sprockets.
. Due to the timing been incorrect the ECU tries to keep the car running by changing the camshaft timing.
. As it cannot adjust enough the car either runs poorly or does not start at all.
. Due to the timing been incorrect. Engine Pistons meet cylinder head valves etc.

. Result=New engine needed or at least a rebuilt one.












New 06K 109 467 K and Old 06H 109 467 AB












The ratchet of the old version




Parts needed to change just the tensioner ~£300 to do at a specialist.




Parts if changing the chain and guides (if going to this length i would change sprockets but thats me(VW don't do this)) ~£1200 to do the job by a VW dealer (note: cover not shown but imho should be changed as well)

Snoopy:
Just realised it doesn't say in the above post that the engine manufacturing date is on the sticker on top of the timing chain cover. :doh:

slynch23:
So is an engine with any of those revisions safe? As mines a 61 plate the engine may be a revision 1. Should I get it changed?

pudding:
That's a great write up from Snoopy there  :happy2:

If you plan on keeping the car for a while, I would be tempted to get the tensioner checked/replaced personally. 

Snoopy:

--- Quote from: slynch23 on September 24, 2022, 10:16:58 pm ---So is an engine with any of those revisions safe? As mines a 61 plate the engine may be a revision 1. Should I get it changed?

--- End quote ---
  The most failures are if the first version. You will probably  have the second or maybe even 3rd version of the tensioner. The likelihood of failure reduces with each revision. The decision is yours. It's the risk to cost that need to be wayed up.
Also keep in mind the early chains are known to stretch and have also been revised. This can be checked with VCDS etc.

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