6.7 starter not engaging
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Trailering
Joined: Jan 2024
Posts: 18
Likes: 1
6.7 starter not engaging
Hey everyone. 2016 F350 6.7. I’ve had it about a year and I’d say maybe once every week or so when I go to start the truck, the starter would spin but it engage. Just make a whirring sound like they do when the bendix doesn’t engage the flywheel.
This last week I finally got myself to replace the starter (not easy on these) with an ACDelco reman and it’s the same. Actually worse. Now it’s every couple times. If I try repeatedly it will eventually engage which makes me think it’s probably (hopefully) not flywheel damage.
What am I looking at here? A defective new starter? Is that common? My batteries seem strong but I only have a 100 amp load tester. Since it happens with the truck hot I’m doubting battery issue.
Thanks again!
This last week I finally got myself to replace the starter (not easy on these) with an ACDelco reman and it’s the same. Actually worse. Now it’s every couple times. If I try repeatedly it will eventually engage which makes me think it’s probably (hopefully) not flywheel damage.
What am I looking at here? A defective new starter? Is that common? My batteries seem strong but I only have a 100 amp load tester. Since it happens with the truck hot I’m doubting battery issue.
Thanks again!
Laughing Gas
Joined: Oct 2018
Posts: 1,004
Likes: 85
From: San Diego
Sometimes it can just be a worn out solenoid on the right fender well.
Check or replace your positive battery cable going to the starter.
Also clean and check the other wires going to the starter.
Just my thoughts.
Check or replace your positive battery cable going to the starter.
Also clean and check the other wires going to the starter.
Just my thoughts.
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Trailering
Joined: Jan 2024
Posts: 18
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FTE Legend
Joined: Mar 2017
Posts: 31,859
Likes: 9,166
From: Western NY
If that happens on my 16, if after checking cable connections and they checked out, I'd be doing a new starter... we have 10 year old trucks.
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Trailering
Joined: Jan 2024
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This is with a new starter. I’m assuming I must’ve gotten a bad one. Just strange that it’s the same issue with both.
FTE Legend
Joined: Mar 2017
Posts: 31,859
Likes: 9,166
From: Western NY
Have you FOUND OUT anything new on this?
Last edited by Overkill2; May 26, 2026 at 08:57 PM. Reason: correct post
Laughing Gas
Joined: May 2024
Posts: 906
Likes: 290
From: E TN
New today doesn't mean good. The days of starter repair shops is slowly fading but if there's one near you have them rebuild your original starter with quality parts.
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FTE Legend
Joined: Mar 2017
Posts: 31,859
Likes: 9,166
From: Western NY
Check the Electrical system components
Found this on Xtreme Diesel's website for their brand of starter for the 6.7... link here.
On that page under Tech Notes, it explains to check all components of the electrical system including the cables, terminals batteries and more. It says depending on circumstances, starters can pull 500 Amps. And that if there's a problem with the system, it could cause a problem with the voltage, which if there is a problem >> high resistance >> which would cause low voltage to be supplied to the starter.
Also says that voltage measured at the starter during cranking should ALWAYS be above 11 volts...
Just FYI.
Here's a starter diagnostic link.
https://engineerfix.com/how-to-test-...gnostic-guide/
On that page under Tech Notes, it explains to check all components of the electrical system including the cables, terminals batteries and more. It says depending on circumstances, starters can pull 500 Amps. And that if there's a problem with the system, it could cause a problem with the voltage, which if there is a problem >> high resistance >> which would cause low voltage to be supplied to the starter.
Also says that voltage measured at the starter during cranking should ALWAYS be above 11 volts...
Just FYI.
Here's a starter diagnostic link.
https://engineerfix.com/how-to-test-...gnostic-guide/
Last edited by Overkill2; May 26, 2026 at 09:14 PM. Reason: add to post
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