new noise after head replacement

I am not an expert on the LR Tdi engine by any means but I am an retired diesel fitter/mechanic, by checking about I have been able to discover that generally the "code", by means of number of holes in the tag on the head gasket indicates the thickness of the gasket in increments of approx .1 mm, that is equal to about 4 thousands of an inch (.004").
It seems that if your engine originally was fitted, say, with a 3 hole gasket (the thickest?) and now is fitted with the 1 hole gasket (the thinnest), that will have moved the head surface .2mm (.008") closer to the top surface of the pistons, everything operates close to give the required compression to ignite the fuel and optimise output without parts colliding.
The above reason is why your mechanic should have carried out a "piston protrusion measurement" with the head off, (piston height above block deck), it is required to select the correct thickness gasket to avoid a case where the pistons can come in contact with the head surface.
A small amount of wear in piston wrist pins and big ends coupled with inertia can give enough over travel of a piston or pistons to collide ever so slightly with the head surface, maybe the source of your engine noise.
The fact that you supplied the parts may let the mechanic "off the hook", unless he was claiming to be a "Land Rover Tdi expert", there are many general mechanics out there who do not "get" some of the specific knowledge required for diesels.
So good luck with it, do not drive it too much whilst it is making the noise as it could lead to more serious damage, and getting your own parts is only a good thing if YOU are going to do the job yourself, at today's labour rates it can be no saving at all to buy bits and then get stuck with the labour costs to do it again because of failure to perform correctly of parts that YOU supplied.

FWIW there are four head gasket thicknesses available for the Tdi, the thickest being a zero hole gasket, and it seems to be fitted to a lot of late build engines.

As Gazby said, you check and swap like for like it do a piston height check.

Gazby great info thank you, workshop is lr speacialist but like you said supplying the parts does give them a pass if it is the gasket to a degree i should of asked for them to check. I saved about $700 sourcing parts myself but that saving will be gone if i need the gasket replaced. I have stoped driving it now till it goes back in on monday. Sick of feeling like im driving a grenade aarrhh

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Originally Posted by benmiller

Gazby great info thank you, workshop is lr speacialist but like you said supplying the parts does give them a pass if it is the gasket to a degree i should of asked for them to check. I saved about $700 sourcing parts myself but that saving will be gone if i need the gasket replaced. I have stoped driving it now till it goes back in on monday. Sick of feeling like im driving a grenade aarrhh

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If the LR workshop removed your old head and it had a different hole head gasket to the one you supplied they should of informed you of that fact and offered to supply the correct gasket or ask you to supply the correct gasket.
If head clearance, because of the incorrect head gasket thickness is the cause of your ticking sound, they should rectify the problem gratias, front them and see if they will fix their mistake, Regards Frank.

Ok so had the disco back now for four days and im confident that its fixed now, m.r automotive put a thicker head gasket in it and didn't charge me for any labour and the noise was reduced but they found the real problem which turned out to be the previous owner who did the timing belt on had a shocker and put it on with a tooth out on cam timing and messed up the pump timing. I have been driving it like this for 40 odd thousand k's not knowing any better and now its fixed the difference is like night and day its smoother quiter and a hell of a lot more powerful you can actually feel the turbo now. I have to give m.r a big wrap they gave
My car priorty to be fixed gave me reduced price and kept me informed of work being done and explain why it needed doing. Happy landy ower once more:)