I have a 4.6 thats just had new cam ,lifters ,rings,bearings ,oil pump and after about 15 mins or so after it gets up to temp it gets a peck sounds like coming from driver side.It sounds great cold but after it gets warm it starts pecking but still runs smooth.Any ideas what it could be??

 

Slipped liner. they make noise when hot and are quiet when cold.

 

We checked them when we had engine tore down and they all were good and flush at top

 

Next time you have the oil pan off look at the bottoms of the sleeves. Some weren't pressed all the way down at the factory, like they should have been before the tops were machined, leaving a 1/8" or so gap at the bottom.

Of course that's always best checked when the heads and oil pan are off so you can see both ends of the sleeve.

The sleeves may look correct from the top but, if the sleeves aren't seated all the way on the bottom they can move.

I can't say for sure that's what your problem is but, that's what it sounds like.... ticks when warmed up and not when cold.

If you are not loosing coolant into your cylinders and everything else seems to be good, try putting in a genuine grey 180 thermostat.

THERMOSTAT ASSY DII & FREELANDER 180 DEGREES FAHRENHEIT, PEL500110, RNQ028 - Rovers North - Classic Land Rover Parts

It will bring your engine temps down, may stop the sleeve from moving (if that's what it is) and may stop your tick. Well worth the price of a new 180 thermostat to give it a try. These engines need a 180 t-stat anyway so would not be a waste of money regardless.

 

post a video

 

what is the degree on the original thermostat? And do you know the part number for the 180 degree one?

 

Original is rated at around 190, land rover knew it needed a 180 but used a 190 on U.S. models to make the engine run hotter and satisfy emissions/import laws.
I put a link to the genuine 180 a couple posts up (post #4). That's about the average price you will find on it. They are not cheap.
Motorad makes a 180 also but, don't buy a motorad. They have been known to not work as well and stick.
The genuine part # is PEL 500110 but some vendors use the same part # to sell the motorad unit.
RoversNorth has the genuine 180 and I think lucky8 and bputah do as well. (bputah lists it as PEL 500110G.)
Wherever you buy it, be sure you are buying the genuine grey 180 in the genuine land rover box.
Good luck and make sure to have coolant on hand for what you will loose while changing this part out and also be SURE you bleed ALL of the air out of the system. There are plenty threads on here to help you with that.

 

I had this problem, as others said it could be slipped liner, but not certainly.

My mechanic said slipped liner because of the noise getting louder when engine got up to temp. Turns out it was the rocker arms. They were aftermarket and the inserts in the cups were loose and making noise.

Have you tried a mechanics stethoscope? Try to find the exact location, or at least which cylinder. Another member, Rovermastertech, suggests hosing the cylinder down from the bottom up and the cooling should shrink the block and lock down the liner... If it's slipped.

 

Yea, no guarantees on the t-stat fix. It stopped my 03 4.6 liner from moving but, could be something else causing your ticking.
By your description it sounds like a liner but,... could be a lifter or rocker or any number of things.
Try the hose down test on the side of the block that it's ticking on or both sides if you can't tell for sure which side it's coming from. Hose it down low below the exhaust manifold right above the oil pan. If its a liner, that may stop it for a few minutes until you take the hose off and it warms back up. It would be worth a try and may let you know if it is a liner. If it does stop the tick then it's more than likely a liner and you could then try the 180 t-stat and see if that will fix it.
Careful with water anywhere near any electronics or sensors or you may end up with more problems.
Also, do this at your own risk as I am not a big fan of spraying cold water on a hot block. Some have but, I haven't so that would be your call if you want to give that a try.