will a bottom end bearing get louder as the truck warms up?

[peanut.901]

hi there my pajero is making a tapping/knocking sound i cant pin point where it is coming from you can hear it clearly when laying under the car and can here clearly from the rocker covers. could it be tappets making the noise ? it gets louder as the vehicle warms up which is confusing me any ideas be awesome thanks. my pajero is 2.5 turbo diesel

[derk]

what's your oil pressure doing

[Crash bandicoot]

Take the rocker cover off and inspect the valve train. If its that bad you will soon figure out which one when you wiggle it. Failing that. Big end bearing. But that,ll be more like some one banging a hammer to metallica.

[Crash bandicoot]

Excuse the pun.

[peanut.901]

ive had rocker cover off and there is afair bit of movement in the lifters i need to get clearance done it also miss fires abit. but will lifters get louder when warm?

[peanut.901]

i dont have a oil pressure gauge but no oil lights or check lights have come up on the dash

[Marco Polo]

I just replaced a noisy rocker on my 4d56. Definitely gets louder when warm. It was failing due to collapsing bearing in the roller. It was very obvious after I slackened all the adjusters and wiggled the rollers.

[cornflake]

should post a video or audio

[peanut.901]

ive done tappet clearance and noise still there could you give me some more info on the rocker arm bearing

[Marco Polo]

ive done tappet clearance and noise still there could you give me some more info on the rocker arm bearing

Take the rocker cover off. Are any of the adjusters wound noticeably further in? If they are that's good reason for suspicion. Otherwise, back off all the adjusters so the rockers are all loose, then just check for play in the rollers. If you have a loose one it will be very obvious. Mine was so bad, I ran out of adjustment on number 3 exhaust rocker which was the give away. Sounded like a rock bouncing around in the engine .