My instructor in CDL school told me that after running the truck "hard" on the highway, it is not good for the engine to cut it off immediately after stopping somewhere. He said to let the engine idle for a few minutes before cutting it off. How would cutting the engine off immediately after running "hard" on the highway, hurt the engine?
Thx.
Turning Engine Off
Discussion in 'Western Star Forum' started by CDLman63, Dec 17, 2020.
Page 1 of 2
-
-
Trucking Jobs in 30 seconds
Every month 400 people find a job with the help of TruckersReport.
-
hot oil in the turbo needs to cool down, I believe.
shutting an engine off after a hard run and they water is not circulating and cooling and they actually get hotter for a while.CDLman63, Rideandrepair and bzinger Thank this. -
Well, Three Mile Island was running hard before it stalled and melted down.
Ok, might be a bit over dramatic.
When you're running, working the engine, it creates heat. Your cooling system circulates cool water to cool the engine. When it's hot, and you stop the coolant flow, the engine, (and the oil) that's still hot, will get hotter. Heat is no good for the oil, or the engine.
With the newer engines that run hotter, it's even more important to let them cool a bit before shutting them down.CDLman63, Rideandrepair, Freddy57 and 2 others Thank this. -
Cools turbo off, used to old rule was 5 minute warm up and 5 minute cool down.
CDLman63 and Rideandrepair Thank this. -
Shutting it off with out a proper cool down cokes up the bearings with burnt oil in a hot turbo.
Usually safe for a shut down when the turbo is 350 degrees or cooler on the pyrometer.CDLman63, austinmike, Rideandrepair and 1 other person Thank this. -
Mainly for allowing some cool down time for coolant, oil and exhaust. If you've got a manual fan, turn it on while idling. Helps pull the heat out better.
Idling also allows the turbo to slow down. Those suckers spin upwards of 80,000 RPM and are precision balanced. If you just finished working that engine and then shut it off, you'll likely be letting the turbo dry spin for a little bit. Better to let it slow down while still being fed lubrication.CDLman63, Rideandrepair and bzinger Thank this. -
Different metals cool and heat or expand and contract at different rates. Also important for the turbo.
CDLman63, Rideandrepair and bzinger Thank this. -
CDLman63, Rideandrepair, Numb and 1 other person Thank this.
-
893k on my isx turbo (2012) always cooled down .
CDLman63, Rideandrepair, Numb and 1 other person Thank this. -
Agree with all the above and also heard that turbos don’t have bearings. It gets lubricatated by oil only (RPMs are too high for any bearing). As it spins fast when you shut your engine off quickly that turbine is still spinning too fast before it stops coking oil that left there leading to premature turbo damage.
CDLman63, God prefers Diesels and Rideandrepair Thank this.
Trucking Jobs in 30 seconds
Every month 400 people find a job with the help of TruckersReport.
Page 1 of 2