Long crank on cold starts? Normal?
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Post Fiend
Joined: Jan 2000
Posts: 5,330
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From: Dryden, ON, Canada
Long crank on cold starts? Normal?
Just a bit curious about this. We've got a new 05 F350 at work, 6.0/torq shift, thing runs beautifully, but, even before it started to cool down, on the first start of the day it cranks over at least twice as much as my old 00 7.3 did. Is this a normal characteristic of this engine? We've not really put much thought into it, but, it was discussed the other morning when it was 30F when I fired it up. The truck only has 1100 miles on it, and so far those hard starts have been chalked up to it not being broken in yet. Just want to make sure we're not going to be looking at a no start situation once it cools off here.
Got Diesel?
Joined: Jan 2004
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Here is latest TSB on cranking times from Ford.
Even though your situation may not be oil related, it does say the cranking times for warm and cold weather operation.
Long Cranking Times at Factory Delivery or After HP Oil System Repair:
If a 6.0 cranks for longer than 2.5 seconds in temperatures above 32 degrees it may be due to air trapped in the HP oil system. To purge the air, drive the truck through 12 hard accelerations from 25-50 MPH. Turn off the engine and allow the truck to sit for 5 minutes. Restart the engine to see if crank time has improved. Crank times of 3-5 seconds in cold temperatures should be considered normal.
TSB #05-19-14.
Hope this helps?
Jeff
Even though your situation may not be oil related, it does say the cranking times for warm and cold weather operation.
Long Cranking Times at Factory Delivery or After HP Oil System Repair:
If a 6.0 cranks for longer than 2.5 seconds in temperatures above 32 degrees it may be due to air trapped in the HP oil system. To purge the air, drive the truck through 12 hard accelerations from 25-50 MPH. Turn off the engine and allow the truck to sit for 5 minutes. Restart the engine to see if crank time has improved. Crank times of 3-5 seconds in cold temperatures should be considered normal.
TSB #05-19-14.
Hope this helps?
Jeff
Last edited by Beachbumcook; Sep 28, 2005 at 12:49 PM.
Got Diesel?
Joined: Jan 2004
Posts: 4,345
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Originally Posted by PSD 60L Fx4
Sounds like my kind of solution right there 
Yes, sir I know I was speeding and squeeling the tires, but Ford Motor Company has authorized me to do this in order to correct a problem with their truck?"
Then the officer says... "please turn around and place your hands behind your back."
Dam, it didn't work!!!
Jeff
Laughing Gas
Joined: Oct 2003
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From: VA/NH
Originally Posted by Beachbumcook
3-5 seconds in cold temperatures should be considered normal[/U]
Super Moderator
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From: Ohio
I don't really think about it anymore. Over my old 7.3 the 6.0 does take longer. When I first got this truck I thought the starts were long......
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Junior User
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I thought the same when I got my 06 PSD. Talked to an "expert" who is aVice President at Nordic Tugs in Anacortes, WA. His comment:
With the true electronic injectors on the new engines (both marine and automotive), there is no physical connection between the injector metering system and the crank shaft. This means that the infector metering system has no way in hades to know when #1 is TDC.
It takes two + complete revolutions before the metering system knows where the pistons are and can start injecting fuel.
With the true electronic injectors on the new engines (both marine and automotive), there is no physical connection between the injector metering system and the crank shaft. This means that the infector metering system has no way in hades to know when #1 is TDC.
It takes two + complete revolutions before the metering system knows where the pistons are and can start injecting fuel.
