Knocking noise in 200tdi head? HELP??????

[ferret]

My def 200tdi has a knocking noise for a while which started as a ticking noise about 18 months ago. It doesnt really start untill the engine heats up and gets louder as the revs increase and speeds up with the revs.
Useing a rod against my ear ive checked the vac pump and injector pump,water pump, injectors, turbo and they sound ok but ive found the noise is in the head on the turbo side and can be heard quite loudly with the rod touched on the rocker rail while the engine was running. All the gaps are set ok at .008 thou so what can this tapping be as its really getting on my nerves as i cant get to the bottom of it.
 HELP
...Paul

[extreme90]

valve guids ?
valve seats ?
does it do it under load ?
no load ?
dan

[ferret]

It does it under both load or reving, and the higher the revs the louder and faster it gets.

[extreme90]

now i had this problem on a old 200 after it got cooked and it was the exhaust valve seats  :?
the guilds wernt very cleaver also though  :?
dan

[ferret]

I think ill remove the rocker rail and see if anything is amiss.

[Eightpot]

I had a similar problem with a mini once - think one of the rocker adjusters had slackened off, plus the rocker gasket was real thin and I'd bolted it down too hard - the rocker arm was tapping on the cover.
Doubt it's this but just a thought.

[unknownmanxman]

Take the rocker shaft off and then crank the engine over and see if you can still hear it...

Could your timing have changed somehow?

Failing that, i spose you could take the had off (it doesnt take long) and whatever the piston is hitting will be obvious!

[crusader]

Before you start Digging too Deep! Check your Top Hats! They might of worn Through like mine Had? :roll: