noise/power problems

[landroverkeith]

Recently my Disco has developed a very annoying tapping/rattling noise and im having trouble finding out what it is...

its connected to engine speed as the revs get louder so does it etc...

can hear it very clearly in the drivers seat when driving but when idling doesnt seem to do it.

also seems to be suffering a bit of powerloss too struggling up hills that normally i wouldnt bother with but now having to drop into 4th

ive had a look in the engine bay and there doesnt seem to be anything loose or signs of anything i can see

any ideas would be helpfull or ill have to pay a visit to the man in the boiler suit  

[Range Rover Blues]

Is this on the TDi? sounds like it could be expensive :(  on thing that comes to mind is a cracked piston

[Skibum346]

Exhaust on cross member?

My engine mounts are a bit on the old side (got replacements to fit... when I can!) and as a result the exhaust rattles at some revs agains tthe cross member.

[Budgie]

Pull the rocker cover off and look at the tops of the valves.
There is a cup on the top each valve and these are known to break.

If one breaks then the tappet gap increases by a huge amount so that will cause the tapping/rattling noise but it also decreases the amount that the valve can open and the length of time it's open. Thus it reduces the amount of gas that can pass the valve and you get reduced performance.  

Easy fix and not much money, if it's this!!  :D

[extreme90]

i say check valve clearences first off
now off top of my head for a tdi at normal op temp its 0.20mm
but i usualy can just tell if its out its blatently ovbious
o, some times if they been given a clog full offroad or onroad they can back them selfs off  :roll:
and it slowly gets worse  :roll:
dan

[AbyssDJ]

id say clearances... and yes it is 0.20mm. easy job

[extreme90]

id say clearances... and yes it is 0.20mm. easy job

not for matty  :lol:  
3 day camel ride for that lad  :roll:

[landroverkeith]

so if i have a read in the haynes manual of destruction i can find it and fix ? i hope so

[Budgie]

Not a hard job and should take around 30 minutes.

It maybe handy to get a new rocker cover gasket though and the part numbers for the gasket and caps are:
LJC100270 - Cap-valve stem
ERR2409 - Gasket-engine rocker cover

One tip when it comes to checking the valve clearances:
Chock the rear wheels, jack the drivers side front wheel just clear of the ground, so you can rotate it.
Put the Disco into 2nd gear and now you can turn the engine over just by turning the wheel in the normal forwards direction.  :D
It just saves trying to do it with a socket on the crankshaft pulley as there ain't much room down there.  

[landroverkeith]

thanks budgie ill have a go at that on pay day :)