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6.5L Diesel Engine Discuss the 6.5 GM diesel engine & associated components. Automatic transmission questions & problems belong in the 4L80/85 - 4L60E - 6L90 Transmission Forum

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Old 10-13-2015, 10:03 PM   #1 (permalink)
Redheadsoxfan5
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Starter Jam up from flywheel bolts??

So tonight I pulled the starter off my 94 6.5 (auto). It wouldn't start and just made a buzzing noise when I turned the key.

As I pulled the starter off, a small bolt fell out that was all chewed up. after pulling the starter completely off I found a second bolt lodged inside jamming up the starter gear.

Any idea where two 3/4-1" long bolts would come from? Fly wheel? Sometime soon, I am going to pull off the flywheel cover and hope that I can see if anything is missing... but two bolts come from somewhere above to fall into the starter.

Anyone had this happen? Would this bend the crank if two bolts came out and threw off the balance of the flywheel?





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Old 10-13-2015, 10:32 PM   #2 (permalink)
Diaric
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Never seen that one before, but everything happens at sometime I guess.

You don't say if you have an Auto or Manual, the term flywheel is interchangeable.

Doesn't look like Fly wheel bolts, they look similar to this.

Looks more like torque convertor bolts with that head style.






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well to make your pump retarded, you could let it hang out with me for a day
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Last edited by Diaric; 10-13-2015 at 10:33 PM.
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Old 10-13-2015, 10:44 PM   #3 (permalink)
Hill Top
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I sure wouldn't drive it till I knew for sure! Either could be bad.
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Old 10-13-2015, 10:48 PM   #4 (permalink)
gimpyrobb
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Yeah, I'd have to agree, deadline it till you can investigate further.
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Old 10-13-2015, 10:59 PM   #5 (permalink)
Hill Top
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I have to wonder what caused this? Could be some vibration from a bad harmonic dampner for instance? I don't know, I would look for cause, bolts shouldn't come loose an fall out.
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Old 10-13-2015, 11:21 PM   #6 (permalink)
Redheadsoxfan5
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Thanks for the info (and the welcome!). They do look like torque converter bolts (it's an auto, put it in my signature). I was hoping to take the truck this weekend but I'm pretty busy working so that doesn't seem like a possibility... Truck is parked until further investigations. Found a used starter for 90 bucks that wasn't really used locally. Buying a parts truck Sunday (hence the need for a truck over the weekend). In all due time!
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Old 10-14-2015, 12:30 AM   #7 (permalink)
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They should both be Loctite'd in. Without, they can come loose. New bolts come with the thread sealant on them.
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well to make your pump retarded, you could let it hang out with me for a day
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Old 10-16-2015, 04:48 PM   #8 (permalink)
Redheadsoxfan5
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Update: It was the Torque converter bolts. At least two are missing and all are loose. Is the flywheel (flex plate) slotted or have the holes become slotted from loose bolts? Cover plate is cracked and gouged up from loose screws. Teeth on flex plate look ok. How hard is the flex plate to replace? Transmission needs to come off? Transfer case too? First 6.5 I've owned and in only 300 miles I'm ready to send it off on a full coverage voyage to the bottom of a boat ramp!











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Old 10-16-2015, 05:24 PM   #9 (permalink)
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Flywheel holes are not slotted... yes, transmission has to drop to swap flywheel. .. my dad had a trick where he'd tilt the motor, replace the two lower bolts with 12" versions and just slide the transmission back to change rear main seal or flywheel...
I don't see too big a problem with getting NEW bolts and BLUE loctite coating them and tighten them up. Ideally a new flywheel is best, but I'd try just new bolts.

Baptized in fire on this truck...
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Old 10-16-2015, 09:48 PM   #10 (permalink)
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I have seen other vehicles with other engines that converter-to-flex plate (flywheel) bolts fell out of, but never one that they would stay in after the holes were wallowed out. I'd plan on replacing the plate if you want them to stay in, because they almost certainly will loosen up again unless the holes they go through are undamaged....Joe

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