Compression Ignition Addict
Join Date: Apr 2007
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On the 6.0L engine, extended idling (more than 2-3 minutes IMO) is a quick way to clog up an EGR valve, possibly coke a turbo, and lead to wet stacking. You need the "high idle mod" to idle more than a few minutes.
Wet Stacking is basically un-burned fuel and partially burned fuel that builds up on the exhaust valves, turbo and exhaust system. It can cause the exhaust valves to stick open (due to sludge build up on the valve stem) leading to a bent valve. It can cause problems with the VGT vanes sticking. Unlike a gas engine, our diesel engine gets cooler when it idles at low rpm, and when the EGT temps fall below 275F wet stacking occurs. At temperatures down to freezing running at 1200 RPM generally causes EGT to be above 275F and wet stacking is prevented. In extremely cold conditions the idle speed will need to be higher.
Also, unburnt fuel "washes down" the cylinder walls, removing lube oil and bringing the potential to incur fairly significant damage to the cylinder walls as time goes by.
In a V-configuration engine (the PSD, in this case) piston isn't moving vertically, so it can't support the fuel. Gravity will pull it to the lower cylinder wall, and there's where the problem starts.
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