Their reasoning seems to be that temperatures are uneven after hard use and by idling the engine cools off and the temperature differences arent as great. Jump to latest follow 1 8 of 8 posts.
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Why idle a diesel engine before shutdown. If a diesel is left idling the internal temperatures will eventually drop a change the temperature gauge may not register. I dont shut down my engine when its hot. So a minute or two run at idle by idle i mean 1200 1500 rpm with a tractor allows the coolant to flow at no load and keep the engine cooler. Rampant lion registered. Turbo charged engines must be idled down to allow the turbo to spool down and even out the temperature in the turbo this is done either by using oil cooling or the engine coolant or both in. While there are a lot of valid arguments supporting the cause of idling even the naysayers will agree youve got nothing to lose by practicing the idling rule.
I had someone tell me to let the truck idle for 10 seconds before shutting down. Why idle before shut off. An immediate shut down after putting a load on an engine can result in overheating the engine coolant flow stops upon shutdown and the block becomes a heatsink. Joined apr 8 2009 470 posts. An idling diesel circulates more than enough lube to keep everything well oiled and revving the engine then shutting if off can leave unburned fuel in the combustion chambers and even starve the turbocharger bearing because the turbo will keep spinning after the oil supply dies. It seems to have to do with the lack of a throttle valve in diesels.
But i guess a minute at high speed without a load wouldnt increase the engine temperature. There is always full air flow though the engine varying only with the rpm. He also said it isnt necessary when just running about town without the trailer. Dan explained that three to five minutes is usually sufficient for cooling down a diesel engine. With time the turbo will become less effective. I believe that diesels unlike gasoline engines do not have heating problems when idling.
And again this practice wastes fuel. But after long hauls you may want to idle the engine for up to seven minutes to allow the manifold to cool down. Says to idle before shutdown. The drop in turn can cause internal parts to cease fitting together as the manufacturer intended. Gasoline engines operate under high intake manifold vacuum at idle due to the closed throttle valve. Discussion starter 1 aug 29 2009.
Abusing your turbocharger can affect its longevity.
Gallery of Why Idle A Diesel Engine Before Shutdown
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