Rattle/clatter at hot idle.
Thread Starter
|
Recovery Vehicle
Joined: Jan 2011
Posts: 800
Likes: 11
That describes exactly what mines does and about a dozen others. I have replaced just about every moving part in the engine, the only original parts are the pistons, crank, valves and valve springs and it still does it. I have tried different weight oils and it makes no difference.
Banned
Joined: Jun 2010
Posts: 1,368
Likes: 4
Its not a deep thud its more of a tap or clacking, but I dont think its coming from the valve train, maybe midway up the motor. It was not doing this when I bought it, it really started a couple weeks ago after I switched to 5w40 synthetic oil from the unknown oil that came in it. I have since switched back to 10w40 mobil 1 dino oil.
Thread Starter
|
Recovery Vehicle
Joined: Jan 2011
Posts: 800
Likes: 11
Here is some thing of interest from someone elses post:
How about the engines that rap at idle? I’ve had several late model Discos at the shop with noise complaints. In two cases, dealers told the drivers they had noise from liners moving up and down, and they suggested the motor was about to fail as a result. One dealer actually got the motor hot and heard it rap, at which time he sprayed the side of the block with a hose and the rap went away. He told the customer that was evidence of liner movement.
Actually, it wasn’t. These photos make it pretty clear that late model liners have nowhere to move. The hose test simply showed that the noise went away when the engine block was cooled – in other words, the noise was triggered by thermal expansion.
Steve and I sorted that noise question out on another engine a few months back. On that motor – which had exactly the same hot rap – we found the piston skirts had collapsed in about ten thousandths of an inch. That was enough to make them rock when they got hot, and they rapped good and loud.
On that engine we expanded the piston skirts and refitted the pistons. No more rap. But did that repair need to be done? Loose piston skirts would not lead to a failure. I’ll bet that motor would have run 25,000 miles with that rap, maybe a lot longer. In any case, new pistons are the fix. Liners are not involved at all, unless the block were to crack when the head bolts were cinched down one more time.
While were talking noises . . we saw a few engines whose secondary air valves had failed, and they also rapped. If you didn't know better you'd swear that secondardy air rap was coming from within the motor. And we still see engines with rocker shaft issues and lifter issues where the raps will fade in and out as the parts rotate while the engine idles hot." http://robisonservice.blogspot.com/2...-failures.html
How about the engines that rap at idle? I’ve had several late model Discos at the shop with noise complaints. In two cases, dealers told the drivers they had noise from liners moving up and down, and they suggested the motor was about to fail as a result. One dealer actually got the motor hot and heard it rap, at which time he sprayed the side of the block with a hose and the rap went away. He told the customer that was evidence of liner movement.
Actually, it wasn’t. These photos make it pretty clear that late model liners have nowhere to move. The hose test simply showed that the noise went away when the engine block was cooled – in other words, the noise was triggered by thermal expansion.
Steve and I sorted that noise question out on another engine a few months back. On that motor – which had exactly the same hot rap – we found the piston skirts had collapsed in about ten thousandths of an inch. That was enough to make them rock when they got hot, and they rapped good and loud.
On that engine we expanded the piston skirts and refitted the pistons. No more rap. But did that repair need to be done? Loose piston skirts would not lead to a failure. I’ll bet that motor would have run 25,000 miles with that rap, maybe a lot longer. In any case, new pistons are the fix. Liners are not involved at all, unless the block were to crack when the head bolts were cinched down one more time.
While were talking noises . . we saw a few engines whose secondary air valves had failed, and they also rapped. If you didn't know better you'd swear that secondardy air rap was coming from within the motor. And we still see engines with rocker shaft issues and lifter issues where the raps will fade in and out as the parts rotate while the engine idles hot." http://robisonservice.blogspot.com/2...-failures.html
Last edited by 94svt50; Mar 15, 2011 at 05:02 PM.
Thread Starter
|
Recovery Vehicle
Joined: Jan 2011
Posts: 800
Likes: 11
I wonder what the long term outlook is with this noise. Will something finally fail? Will it tap for 100k more miles? To me it seems to have gradually gotten louder over the last several weeks.
Thread Starter
|
Recovery Vehicle
Joined: Jan 2011
Posts: 800
Likes: 11
I hear alot of clicking consistent kind of noise from top end, but underneath and next to wheel well you get more of a tapping sound mixed in. It kind of goes in and out abit in the audio clip.
Sounds like your Rover is driving you bonkers.....