All Things Mk5 > Mk5 General Area
Timing chain rattle.
Teutonic_Tamer:
--- Quote from: gazbutS3 on June 21, 2009, 09:03:59 pm ---u don't have a timing chain :smiley:
--- End quote ---
Sorry, but the 2.0 TFSI engine DOES have a timing chain, albeit only a dinky one, at the flywheel end of the head. The timing belt just drives the exhaust camshaft from the front of the engine, and the inlet cam is driven from the opposite end via the chain and an adjusting unit for varying the inlet cam timing! :P
Teutonic_Tamer:
--- Quote from: Phil Mcavity on June 21, 2009, 09:59:09 pm ---Does the Valve chain use hydraulic lifters which relys on oil feed to lift or is it valve and spring/rocker etc??. Anyone know????
--- End quote ---
The timing chain has its own little hydraulic tensioner, but the chain would have to be well fcuked to hear it, because it is a really short chain
--- Quote from: Phil Mcavity on June 21, 2009, 09:59:09 pm ---My old CVH engine in an old ford i had used to have hydraulic lifters, and when the oil got old and thinner, it made the valves chatter causing a rattle or Knock. Perhaps the TFSI has the same "sort of" principle??
--- End quote ---
I think you car confusing the camshaft drive tensioners, with the valve clearance compensation. But yes, virtually all modern engines have 'hydraulic tappets', and really need very clean oil. Sadly, the CVH engines (typical Fords) were bad, but their Zetec engines were even worse, which is why you can only use a 5w30 oil in them - even if you race tune them!
Teutonic_Tamer:
--- Quote from: ukdub on June 21, 2009, 10:47:24 pm ---We all have a chain as well as the belt. It is on the opposite end of the block and drives both cams. I know a lot about this issue and it is not the normal sounds that our TFSI engines make. IE. Injectors, carbon canister, purge valve or other stuff like that. This noise that the OP is on about is the cam chain. At the moment it only seems to affect early TFSI engines (AXX). My engine sounds like a bag of nails when warm but nice and quiet when cold. Have a read of this if you havn't already.
http://www.golfgtiforum.co.uk/index.php?topic=115268.0
Its quiet long and now and again a few red herrings get thrown in, but ultimatly the chain is at fault.
--- End quote ---
Just to be pedantic, the exhaust is driven by the belt, and the inlet is driven by the chain! :P
Teutonic_Tamer:
--- Quote from: Boothmeister on June 22, 2009, 09:40:56 pm ---My 05 plate does exactly as Bigbo describes. It sounds like its coming from behind the glove box almost and its a sort of dull tapping which is most prominent when the engines cold. Almost like plastic knocking on plastic rather than metal on metal? Its been bugging me for ages.
Is changing the chain an expensive job like the timing belt?
--- End quote ---
If it IS just the chain, it will be much easier than changing the cam belt. If you pull off your plastic engine cover, you can see the timing chain housing nearest the battery, at the end of the black plastic cam cover.
gazbutS3:
--- Quote from: Teutonic_Tamer on June 29, 2009, 04:12:59 pm ---
--- Quote from: gazbutS3 on June 21, 2009, 09:03:59 pm ---u don't have a timing chain :smiley:
--- End quote ---
Sorry, but the 2.0 TFSI engine DOES have a timing chain, albeit only a dinky one, at the flywheel end of the head. The timing belt just drives the exhaust camshaft from the front of the engine, and the inlet cam is driven from the opposite end via the chain and an adjusting unit for varying the inlet cam timing! :P
--- End quote ---
Thanx TT but UKdub already pointed that out
--- Quote from: ukdub on June 21, 2009, 10:47:24 pm ---We all have a chain as well as the belt. It is on the opposite end of the block and drives both cams. I know a lot about this issue and it is not the normal sounds that our TFSI engines make. IE. Injectors, carbon canister, purge valve or other stuff like that. This noise that the OP is on about is the cam chain. At the moment it only seems to affect early TFSI engines (AXX). My engine sounds like a bag of nails when warm but nice and quiet when cold. Have a read of this if you havn't already.
http://www.golfgtiforum.co.uk/index.php?topic=115268.0
Its quiet long and now and again a few red herrings get thrown in, but ultimatly the chain is at fault.
--- End quote ---
:P
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