turbo cooling
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Mountain Pass
Joined: Feb 2007
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From: Wilsonville, OR
turbo cooling
How many of you waited the 7 to 10 minutes before turning off the diesel engine to allow for turbo cooling? Is there any devices to do this automatically?
GregM
GregM
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From: South west Wisconsin
Greg-under normal circumstances a minute or so is usually good, however if you have been pulling hard 3 to 5 minutes is good, but 7 to 10 isnt necessary, especially with the price of fuel these days.
Senior User
Joined: Sep 2007
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From: Montoursville, PA
When I owned diesels I would make a point of letting it idle for normally close to 10 mintues after a hard pull. I never shut off to refuel during long trips.
For short trips, don't worry about it. Just stop the truck, put it in park, and shut it off when the door is open and you're ready to get out (seat belt off and all).
For short trips, don't worry about it. Just stop the truck, put it in park, and shut it off when the door is open and you're ready to get out (seat belt off and all).
Lead Driver
Joined: Jan 2006
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From: Hartford, WI
They make turbo timers that are controlled by time or EGT temps. Before you do this, why do you want it? What temps are you shutting down at?
Lead Driver
Joined: Jan 2006
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From: Hartford, WI
IMO, it's a safety thing for the manufacturer ON YOUR DIME. Now if you were towing up a hill and shut down suddenly, I could see an issue. However, I drive highway and it is about 400 by the time I park the truck. I think that is safe to shut down. I usually go by my EGT gauge.
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Mountain Pass
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Lead Driver
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From: Hartford, WI
NP. BTW, IIRC, the problem was the rapid shutdown from a high heat situation that traps hot oil in an even hotter turbo. That oil burns (cokes) and causes problems in the turbo and other systems. Like I said, while I am pulling off, I notice the temps drop so I usually don't bother to wait or use a turbo timer. Depending on your truck your results might be the same. Without gauges though, we can't know for sure but if I were to take a WAG, I'd say you are fine.
Senior User
Joined: Sep 2007
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From: Montoursville, PA
There are a few issues. One of them is the hot oil in the hot turbo that causes coking. Another is the hot turbo suddenly losing cooling, and cooking the seals, which means you have a leaky turbo. Then you have the turbo that is still spinning suddenly losing lubrication, and hurting the bearings. Keep in mind, turbos generally spin at upwards of 100,000 RPM. That's really fast to then be losing all your lubrication.
Considering it a safety measure that the manufacturers do on your dime may not be entirely wrong, but I know that the turbo diesels I have seen that are not allowed to cool down tend to have turbo issues by 80k miles. The ones that are allowed to cool down have turbos that seem to last forever. I can reference two trucks I have personally owned that had great functioning turbos, good as new, when I got rid of them, and can also reference plenty of trucks where the owners would just shut the thing right off after a hard run and the turbos were shot by 80k. You won't notice a difference today or tomorrow, but it will happen.
Considering it a safety measure that the manufacturers do on your dime may not be entirely wrong, but I know that the turbo diesels I have seen that are not allowed to cool down tend to have turbo issues by 80k miles. The ones that are allowed to cool down have turbos that seem to last forever. I can reference two trucks I have personally owned that had great functioning turbos, good as new, when I got rid of them, and can also reference plenty of trucks where the owners would just shut the thing right off after a hard run and the turbos were shot by 80k. You won't notice a difference today or tomorrow, but it will happen.
Lead Driver
Joined: Jan 2006
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From: Hartford, WI
I can reference two trucks I have personally owned that had great functioning turbos, good as new, when I got rid of them, and can also reference plenty of trucks where the owners would just shut the thing right off after a hard run and the turbos were shot by 80k. You won't notice a difference today or tomorrow, but it will happen.
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NP. BTW, IIRC, the problem was the rapid shutdown from a high heat situation that traps hot oil in an even hotter turbo. That oil burns (cokes) and causes problems in the turbo and other systems. Like I said, while I am pulling off, I notice the temps drop so I usually don't bother to wait or use a turbo timer. Depending on your truck your results might be the same. Without gauges though, we can't know for sure but if I were to take a WAG, I'd say you are fine.
DSMMH
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Joined: Oct 2006
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From: Bremerton, Wa.
I drive a school bus with a turbo cummins and normally,unless I have just come off the freeway or a hard pull loaded up a hill,I usually give it about 3-4 minutes.With the "X",I will let it idle for about five minutes if I have just pulled the trailer into the backyard (7-8% for over 200' at very slow speed) or just come off the freeway for fuel. I figger that if I have been driving on city streets ,whether or not I've been towing,a couple of minutes is good enuff.
GMCBuffalo,is that one of those big things with a 4speed oil-bath clutch and a big Detroit Diesel that you took your name from.. If it is,I drove a '78 from Bremerton Wa to Tecate Mexico several years ago with a bunch of kids to build some houses.. Fun trip,20mph over the Grapevine and an out-of order bathroom..
GMCBuffalo,is that one of those big things with a 4speed oil-bath clutch and a big Detroit Diesel that you took your name from.. If it is,I drove a '78 from Bremerton Wa to Tecate Mexico several years ago with a bunch of kids to build some houses.. Fun trip,20mph over the Grapevine and an out-of order bathroom..
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Mountain Pass
Joined: Feb 2007
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From: Wilsonville, OR
Yes, I had a 1967 converted bus RV, a PD4107 buffalo bus, a 35' bus with the hump after the first 4 seats, 8V71 DD and 3 speed allison auto tranny. Now I have a '91 Prevost Bus with a 8V92DD and 5 speed allison and I tow my X for a Toad.
Greg
Greg
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Joined: Oct 2006
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From: Bremerton, Wa.
Cool,you ever get out my way,look me up.. I'm also on the RV.net forum...Just saw a late model Buffalo that had just been re-done with the Detroit having a turbo added and an allison and the interior was modern roughing it style with nice darker carpets and very functional furniture.. Compartments all re-done with cabinets,pull-out trays,outside flatscreen TV with home theatre and a collapsible NASCAR roof platform.. It was built so that it came apart in sections and stored in it's own compartment...Beautiful rig...
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