Loud knocking sound from engine at idle ??

[Goofy_]

Talking about engine of my G60. I noticed this new effect weeek ago after few cold starts at -10 degrees celsius. Very noisy knocking sound between few second (3-4s). Silent 4 seconds and then knocking few times and silent..knocing and so on... and only at idle. It seems to come from lower part of engine. I've changed rattling water pump and inefficient steering pump about year ago. Oil pump this time ? Any good ideas

[Goofy_]

Not even ideas ??

[weejunGL]

sounds to me like worn lifters.

they have the same symptoms. ticking at idle, and even worse when cold

[Goofy_]

Souds much more than ticking....

[Schnitzelburnr]

overtightened belt made water pump go again maybe... happened to me, just take belt off and turn the pulleys to check really quick

[VTC THIS]

Talking about engine of my G60. I noticed this new effect weeek ago after few cold starts at -10 degrees celsius. Very noisy knocking sound between few second (3-4s). Silent 4 seconds and then knocking few times and silent..knocing and so on... and only at idle. It seems to come from lower part of engine. I've changed rattling water pump and inefficient steering pump about year ago. Oil pump this time ? Any good ideas

How many KM's on the clock? Sound a bit like piston slap...play between the wristpin and piston.

[Noodleboy]

Pull your belt off and start the engine to see if any of re accessories could be the cause. You still got the noise then it's in the motor.

[lowburb]

Rod bearings are a common wear item but usually hear them at a slightly higher rpm. I would imagine if they were bad enough you could hear them at idle.

[JustMike]

Rod bearings are a common wear item but usually hear them at a slightly higher rpm. I would imagine if they were bad enough you could hear them at idle.

And the funny thing only one side of the bearing wears, the bottom shell was almost new the the top shell was thru the copper and into the babbit

[ThatsNotStock]

Check the main crank pulley. is it wobbling? I too thought I had a bad rod until i found a thread on vortex talking about the crank pulley bolt shearing and causing the pulley to wobble or fall off completley. If your pulley is wobbling when it runs do a search for "crank and bolt" on the Corrado. there are 5 or so threads on it.

[kerobert]

I had the same problem after AC deleting and installing a new H2O pump. the bearing for the pump shaft to the pulley died causing the pulley to wobble like crazy.
We went through everything until we actually saw it. It sounded totally like it was the bottom end and expensive.
I've been told that the bottom ends on the G60s are fairly strong and unless they have been beat on, should last a long time. I'm at 220,000km and have no problems after the new pump got replaced for another new pump.

GL.