Turbo cool down - pyrometer - Diesel Forum - TheDieselStop.com
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post #1 of 22 (permalink) Old 04-27-2017, 10:41 PM Thread Starter
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Turbo cool down - pyrometer

How does one know when a turbo has cooled down enough to turn the engine off?
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post #2 of 22 (permalink) Old 05-02-2017, 07:11 AM Thread Starter
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Read in the owners manual that the 6.7 should be run for three to five minutes before shutting down.
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post #3 of 22 (permalink) Old 05-02-2017, 10:55 AM
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If engine has not been worked (normal driving) it is not very important. If towing, or extended high speed driving, the 3 to 5 min. should be done. The turbo shaft can cook the oil and lead to problems. Years ago they designed a "bathtub" around shaft to stop the problem. I have had auto shut off wired to sensor and truck would shut off with key under normal conditions. I "think" it was set to shut engine off at around 400 degrees.


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Current Truck: 2017 (White Gold/Caribou) Lariat F350, CC, SB, SRW, 6.7, Ultimate Package, 5th wheel prep, tow tech bundle, dual heavy duty alt, 20" rims, BLIS, Quad Beam LED headlamps, Adaptive cruise, 3.55 elec locker, mats, running bds, etc

Truck History:
2015 F150 Lariat, CC, SB, 3.5 tt
2011 F250 SD, CC, SB diesel
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2003 F250 SD, CC, LB, diesel
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1997 F250 Light duty, extended cab, SB
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post #4 of 22 (permalink) Old 05-02-2017, 01:22 PM
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Quote:
Originally Posted by Phillippeterson View Post
Read in the owners manual that the 6.7 should be run for three to five minutes before shutting down.
This only applies, in my opinion, if you driven it pretty long and hot. 3-5 minutes.

Current:
  • '17 Ford F-350 King Ranch Crew Cab long bed 6.7l V8 (440/925)
  • '06 Yamaha FJR1300AE motorcycle
  • '03 Thor Jazz 2850BH Fifth Wheel

Past:
  • '11 Ford F-350 King Ranch Crew Cab long bed 6.7l V8 (400/800)
  • '08 Ford F-350 King Ranch Crew Cab long bed 6.4l V8 (350/650)
  • '04 Ford F-250 King Ranch Crew Cab long bed 6.0l V8 (325/560)
  • '01 Ford F-250 Lariat Crew Cab short bed 6.8l V10 (310/425)
  • '99 Ford F-250 Lariat Crew Cab short bed 6.8l V10 (275/410)
  • '97 Ford F-150 XLT Supercab short bed 4.6l V8 (220/290)
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post #5 of 22 (permalink) Old 05-03-2017, 10:57 AM
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I've wondered this as well. My old truck had a timer built into the remote start. I guess worst case, you could get out, lock the truck and then remote start it for 10 minutes.

2017 F-350 CCSB 6.7L
[old]2002 7.3L PSD, 6spd, 4x4 Off-Road, Super Cab, Short Bed, ARE Topper, SCMT Autometer gauges, Tymar, 4" SS aero-turbine exhaust, & WW.

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post #6 of 22 (permalink) Old 05-03-2017, 02:28 PM
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I have done just that on the previous truck!

Current:
  • '17 Ford F-350 King Ranch Crew Cab long bed 6.7l V8 (440/925)
  • '06 Yamaha FJR1300AE motorcycle
  • '03 Thor Jazz 2850BH Fifth Wheel

Past:
  • '11 Ford F-350 King Ranch Crew Cab long bed 6.7l V8 (400/800)
  • '08 Ford F-350 King Ranch Crew Cab long bed 6.4l V8 (350/650)
  • '04 Ford F-250 King Ranch Crew Cab long bed 6.0l V8 (325/560)
  • '01 Ford F-250 Lariat Crew Cab short bed 6.8l V10 (310/425)
  • '99 Ford F-250 Lariat Crew Cab short bed 6.8l V10 (275/410)
  • '97 Ford F-150 XLT Supercab short bed 4.6l V8 (220/290)
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post #7 of 22 (permalink) Old 05-10-2017, 01:18 PM
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When I am towing 17,000lbs, I don't shut if off when I get fuel etc.
I will shut it off as I have gone through my neighbor hood to my house, or driven on a dirt road slowly to where I am going.
But right off the freeway or road, nope, let it cool down.
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post #8 of 22 (permalink) Old 05-12-2017, 01:14 PM
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Came back across this and got curious. I was told with my first diesel, which I had chipped for towing, to make sure the turbo cooled, something to do with "coking". So I did. Bankpower.com says:

Quote:
MYTH #7

You have to let a turbo-diesel idle for two minutes before you shut it off.

FACT

This is a current myth that has a basis of fact stemming from many years ago. It also has a kernel of truth regarding today's turbocharged gasoline engines that operate at higher peak exhaust temperatures than turbo-diesels. In the early days of turbochargers, the turbo shaft was supported by a babbitt bearing that could seize, or even melt, if the engine was shut off immediately after sustained boost conditions where the turbocharger would "heat soak". A two minute cool down at idle allowed the turbocharger to dissipate any remaining spinning inertia, and the oil circulation cooled the bearing and prevented oil "coking" in the bearing area. Turbochargers haven't used babbitt bearings for over 30 years, and today's oils resist coking. Synthetic oils won't coke, period. With a turbocharged gas engine, it's still good insurance to let the engine idle for 30 seconds to a minute to allow the turbo or turbos to dissipate any inertia and to cool the bearing area to prevent oil coking, especially if the engine has been worked hard just prior to shut-down. Of course, using quality synthetic oil eliminates this potential coking problem.

Today's turbo-diesels are a different story. There is really no reason to "cool down" a turbo-diesel these days, but you won't hurt anything by doing it either. You can still find people who swear you have to do it, but the myth is fading. Maybe they just like to sit and listen to the radio.


This seems to make sense to me.

I then looked at the manual for recommendations on cooling and found:

Quote:
To help prolong engine life, we
recommended you allow the engine to idle
for three to five minutes, especially after
any of the following:
Continuous engine speed.
High ambient temperature.
High GVW or GCW operation, for example heavy loads or trailers.
This allows the turbo charged engine to l down.

I wish this was a little better defined.

Current:
  • '17 Ford F-350 King Ranch Crew Cab long bed 6.7l V8 (440/925)
  • '06 Yamaha FJR1300AE motorcycle
  • '03 Thor Jazz 2850BH Fifth Wheel

Past:
  • '11 Ford F-350 King Ranch Crew Cab long bed 6.7l V8 (400/800)
  • '08 Ford F-350 King Ranch Crew Cab long bed 6.4l V8 (350/650)
  • '04 Ford F-250 King Ranch Crew Cab long bed 6.0l V8 (325/560)
  • '01 Ford F-250 Lariat Crew Cab short bed 6.8l V10 (310/425)
  • '99 Ford F-250 Lariat Crew Cab short bed 6.8l V10 (275/410)
  • '97 Ford F-150 XLT Supercab short bed 4.6l V8 (220/290)
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post #9 of 22 (permalink) Old 05-12-2017, 01:21 PM
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Clear as mud!

2017 F-350 CCSB 6.7L
[old]2002 7.3L PSD, 6spd, 4x4 Off-Road, Super Cab, Short Bed, ARE Topper, SCMT Autometer gauges, Tymar, 4" SS aero-turbine exhaust, & WW.

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post #10 of 22 (permalink) Old 05-13-2017, 11:20 AM Thread Starter
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Picked up my new 2017 F450 last week. Have 2 miles on it as I got it. Have 3,000 miles on it with a large camper in the back. Transmission temp stays around 207 and engine oil temp stays at 210. I like to idle to get the transmission temp at 199. Takes about three minutes.

Sound good?
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post #11 of 22 (permalink) Old 05-14-2017, 09:09 AM
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Doesn't the old 'wait until it's down to 350* egt' still apply?

2000 F250 XLT 4x4 SC 7.3 w/Auto Tranny w/ TC L/U Sw & shift kit, Fully gaged, Super Zoodad, PHP Hydra chip, 4" DP/Exhaust w/dual 3.5" outlets, 295/75/16 BFG ATs on 8" rims, 08 AlumDiffCvr, Bilsteins, 31 row trans cooler, Bigger 66/88mm Billet Compressor wheel with ported shroud, BPV delete.
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post #12 of 22 (permalink) Old 05-14-2017, 01:59 PM
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I tend to think of it like a turbine helicopter... They have to wait 5 minutes for the metals in the engine to normalize before shutdown. I know, has nothing to do with turbo diesels, but... lol.

Do what you want, you are either right or wrong, and it will either cost money to fix or not. ACK!
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post #13 of 22 (permalink) Old 05-15-2017, 12:30 PM
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Quote:
Originally Posted by 69mach1377 View Post
Doesn't the old 'wait until it's down to 350* egt' still apply?
I like that one, good rule of thumb. Assuming you know your EGTs.

Current:
  • '17 Ford F-350 King Ranch Crew Cab long bed 6.7l V8 (440/925)
  • '06 Yamaha FJR1300AE motorcycle
  • '03 Thor Jazz 2850BH Fifth Wheel

Past:
  • '11 Ford F-350 King Ranch Crew Cab long bed 6.7l V8 (400/800)
  • '08 Ford F-350 King Ranch Crew Cab long bed 6.4l V8 (350/650)
  • '04 Ford F-250 King Ranch Crew Cab long bed 6.0l V8 (325/560)
  • '01 Ford F-250 Lariat Crew Cab short bed 6.8l V10 (310/425)
  • '99 Ford F-250 Lariat Crew Cab short bed 6.8l V10 (275/410)
  • '97 Ford F-150 XLT Supercab short bed 4.6l V8 (220/290)
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post #14 of 22 (permalink) Old 05-15-2017, 02:01 PM
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I think if I came off the freeway I would let it sit a few before I shut down (Ill keep running if just getting fuel and taking off again) , but going home, thru my neighborhood, by the time I get home, its cooled off.

2017 F350 6.7 Platinum CCLB DRW
2012 F250 6.7 Lariat Ultimate CCSB FX4
2012 F150 Ecoboost FX4 CCSB FX4
2011 F250 6.7 Lariat Ult CCSB FX4 (sold)
2009 F250 6.4 KR CCSB 4x4 FX4 (sold)
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post #15 of 22 (permalink) Old 05-16-2017, 08:53 AM
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Quote:
Originally Posted by manowell View Post
I like that one, good rule of thumb. Assuming you know your EGTs.
Well I think knowing your EGT is key to knowing when it's okay to shut it down. Is it possible that value is accessible somehow if you don't have a dedicated gage? Pre-turbo of course...

2000 F250 XLT 4x4 SC 7.3 w/Auto Tranny w/ TC L/U Sw & shift kit, Fully gaged, Super Zoodad, PHP Hydra chip, 4" DP/Exhaust w/dual 3.5" outlets, 295/75/16 BFG ATs on 8" rims, 08 AlumDiffCvr, Bilsteins, 31 row trans cooler, Bigger 66/88mm Billet Compressor wheel with ported shroud, BPV delete.
Jayco 26BHS elite, no RV parks...just the woods.

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