Is anyone having trouble with turbo coking caused by shutting down before the turbo has time to cool? If so how is it corrected?
Thanks,

Dave

I have not noticed any problem but then I probably won't until the turbo or some internal engine componet fails. I did a search for you and learned a thing or two...

"I'll Pass on the Coke...
The problem with any turbo is that since it works with exhaust gases, when it's worked pretty hard it gets really hot, even to the point of actually burning the oil which runs through it. This causes the oil to crust up and become abrasive. This undesirable process is called "coking". This effect can ruin not only the turbo, but since the same oil goes to the rest of the engine, it can act like fine sandpaper on it as well, etching away at the components of the engine.

The worst cause of coking is when the engine is worked pretty hard, and then stopped without having a chance to cool down. The oil that sits in the ultra-hot turbo crusts up. Hopefully most of that abrasive junk will be caught in the oil filter before it causes any other engine damage, but in practice teeny particles can slip through the filter and act like Comet scouring your engine. It is thus wise to use a high-quality oil filter.

Ways to limit the coking problem include using synthetic oil which is more heat-resilient, using a better oil filter, letting the car idle for about 30 seconds before shutting it off, installing a handy device known as an oil cycler, and making sure that the cooling system is up to snuff."
http://home.flash.net/~lorint/lorin/turbo.htm


When it's hot out more often than not I turn my a/c off for the last mile or two before arriving at a destination, keep a real light throttle action and I wait to turn off the engine as long as my patience will last, usually about 30 seconds. There are at least two different things that I know of you can do to avoid have to have any patience at all and one is a timer that shuts off your engine at a specified time after you have turned off the ignition and the other is a pre-luber/post-luber.


"Turbo bearings remain extremely hot after engine shut off and create coking of oil. This can also be eliminated with the Pre-Luber. The turbo version provides a post-lubrication cycle, of up to five minutes, to provide continual oil flow through the engine and turbo. This facilitates engine and oil cool down. The oil circulates through the turbo charger thereby preventing coking of the turbo and warping of the engine.

Another advantage of the Pre-Luber is the simple and easy oil change. The hose connected to the outlet side of the pump can be fitted with a quick disconnect coupling, and allows you to run that hose to a container where the oil can be eliminated from the oil pan. Turn the key to the "accessory" position and pump the oil. Most oil can be discarded in about two minutes."
http://www.pre-luber.com/turbocharged.htm

Hey Dave,

Davey Jones hit the nail on the head. I always let my truck idle for 30 sec to 1 min after a heavy load or a empty load (It's a good habit).Like he said turning off your ac before you arrive at your destination will also help with cool down.

Good Luck

i have a remote start on my truck. hit the remote button when it beeps i remove the key & lock the truck & walk away

Install a turbo timer, they can be had for like $50, $80 for a good one.


I always heard the reason to idle down is to allow the turbo to spool down and the bearings to have oil circulated over them. Turbos spin like 100KRPM so if you go boosting around and then shut it down the turbo could still be spinning, and the bearings generating heat but with no fresh oil to cool them.

So install a turbo timer or have the paitence to either drive really mellow for a few minutes prior to your destination, or allow it to idle for a minute or 2 before shutting it down

Thanks fellas for the help.

HAve a safe and blessed Labor Day

another thing is made by Ispro called a turbo temp monitor and it is designed to shut the engine down once the EGTS reach a safe,cool temp.
i myself just let the truck idle untill the AFTER TURBO egt's reach at or below 450*F ( the cooler,the better).

where did you find the Turbo Timer, please sir?

THanks

another thing is made by Ispro called a turbo temp monitor and it is designed to shut the engine down once the EGTS reach a safe,cool temp.
i myself just let the truck idle untill the AFTER TURBO egt's reach at or below 450*F ( the cooler,the better).
My pre-turbo egts run about 700-800 empty on the highway. How much does the temp drop across the turbo?

300~400*f,but the pre turbo temp will drop alot faster than post turbo temp upon cool-down,and the turbo is what you want to monitor on cool down