4.2 knocking

You've done everything I would have done. Check your toolbox - are you missing a spanner? :-)

It's possible that what you are hearing is "cam walk", a knocking noise caused by the camshaft walking back and forward slightly in the block as it rotates. This only tends to occur on engines with a keeper plate style of location on the front of the cam though, serpentine belted engines onwards. Land rover actually had a form of recall / tech bulletin about this on early Disco II and P38 models. It's also possible that it could be one of the follwing:- small-end, piston slap, crank bearings or camshaft bearings, but it's hard to diagnose without actually hearing it. Badger. B.H.Engineering, Rover V8 engine specialists.

thanks for the info people

need to work out the costs :o(

thanks

Thinking further, it's unlikely to be piston slap, that normally manifests itself instantly on cold start and goes away in varying degrees as the engine reaches working temp and everything expands with the heat. How loud a knock is it? Is it a dull knock audible with the stereo on, or is it relatively quiet but just that you are more aware of it? It might be worth getting an oil pressure test carried out on it to see if the pressure is excessively low (less than 7 or 8psi at idle or 25ish at 2400rpm), also worth a quick check to see that the front pulley bolt is tight! If it has a dizzy, remove the cap and turn the engine with a socket on the front pulley - turn it back and forward and see how many degrees it moves to take up any slack before the dizzy turns. Any more than about 5 degrees and the cam chain is stretched, which will give rise to a knock also. Badger.

thanks for the extra info

had new chain and pulleys with the new camshaft

oil pressure is within limits

seeing the engines in a kit car the noise is loudish but its surrounded by fibreglass not steel so it might be that loud

the noise is more based between no 5 & 7 pots

as you can see i hve covered most bases

many thanks for the help

jon

Not using any water is it?

no water loss after 150 mile drive ears a bit sore :o( as i said theres no loss of power which is the anoying part

let the car sit for a while then start it up the no noise for a while then away it goes

thanks for all your help people looks like a rebuild over the winter

thanks again

jon

Hydraulic tappet not pressurising?

Funny I was just thinking similar when I did my top end rebuild I accidently turned the rocker shaft which buggerd up the oil feed on one bank easily sorted I pulled the cover off and found that there was little or no feed on that side . Derek