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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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  • 1 Post By OkDually
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Old 08-11-2017, 06:37 PM   #1 (permalink)
1998GMCsuburban
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Starter clanked but would not turn over the 6.5L

Hi,


Maybe this will be helpful to someone.


I found out that my starter's crank gear had stuck in the flywheel after I was done troubleshooting my starter relay.


The starter clanked loud and hard when I turned the key but nothing happened. I checked all the easily accessible electric connections and the batteries, but I could find nothing wrong. I thought maybe the starter gear was hitting the side of the flywheel instead of engaging its teeth.


I found "Know your cars Clicks. Why it won't start" on YouTube while I was taking a break. 'Foxboss9' recommended hand turning over the engine by hand to see if it was seized or if the starter was stuck. I didn't expect it to be seized but it seem to be a quick way to see if the starter was stuck.


I found that the easiest way to hand turn the 6.5L was to (1) put a strap wrench around the pulley on the AC unit and (2) turn it while (3) using counter torque so I wouldn't damage it.


I set the brake, put the transmission in neutral, and turned the key to its off position.
Sure enough the starter gave another loud clank as soon as I moved the pulley and the serpentine belt turned the crankshaft just a little bit. After that it started fine.


Here's how we had gotten to that point. Earlier, my young son was helping me by turning the key to start while I wiggled this and that. We finally got a starter bump when I tried moving the starter relay.
I removed the relay and straightened out the mangled connectors in the fuse box as well as I could (clearly an impatient previous owner's handy work).
Then while I was under the hood watching and listening my son tried again and the 6.5L roared to life.
However, I obviously had not explained well enough (or maybe not enough times ) how you release the key and keep the engine running. He had held the key in the start position with the motor running until I came around the door and told him to turn it off. I noticed the key turned further then I had expected.
We may have dinged up the cranking gear's teeth a bit .

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Old 08-11-2017, 07:12 PM   #2 (permalink)
JMJNet
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In this truck, you just replace the starter.

Make sure the back bracket (towards front of the truck) is attached properly.

You don't need to try to turn the engine.

Now, you may have to replace the flywheel?

This engine seized usually caused by oil cooler line failure that cause all the oil to leak out while engine is running or the crank broke.
It happened but usually your symptoms mean starter is bad or whoever install the starter did not put the back bracket on properly.

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Last edited by JMJNet; 08-11-2017 at 07:14 PM.
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Old 08-26-2017, 04:08 PM   #3 (permalink)
1998GMCsuburban
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Thanks JMJNet.

I checked the starter and the forward bracket is gone. I ordered a new bracket and its bolt. The starter seems to be shot, it just sticks now.

In the mean time, I have finished installing Leroy Diesel's PMD remote mount kit and his oil cooler line kit.
I also replaced all three O-rings in the oil filter 4X4 adapter. They shattered into smaller pieces as I removed them.

I will drop the starter out of the Suburban today.
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Old 08-26-2017, 04:15 PM   #4 (permalink)
OkDually
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Quote:
Originally Posted by 1998GMCsuburban View Post
Thanks JMJNet.

I checked the starter and the forward bracket is gone. I ordered a new bracket and its bolt. The starter seems to be shot, it just sticks now.

In the mean time, I have finished installing Leroy Diesel's PMD remote mount kit and his oil cooler line kit.
I also replaced all three O-rings in the oil filter 4X4 adapter. They shattered into smaller pieces as I removed them.

I will drop the starter out of the Suburban today.
Be sure to install the Starter Support Bracket Before you start the engine..

Without the support bracket, the starter will torque itself off of its mounting and possibly cause severe damage to the engine block..
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Old 08-27-2017, 09:20 PM   #5 (permalink)
1998GMCsuburban
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Hi OkDually,

Thanks.

I just got the new starter home late today.

The forward mounting bracket and bolt are here now too. I also got new GM starter mounting bolts and washers.

Now I just need to get it all back in.
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Old 08-28-2017, 09:58 AM   #6 (permalink)
JMJNet
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Make sure the starter itself is tight when put back.

Hopefully, the flywheel had not been damaged by the old improperly installed starter.
__________________
1995 GMC Suburban:
PMD in Bumper
Leroy Diesel Flight System PMD
Leroy Diesel Oil Cooler Line
4" Warpspeed Exhaust
Kennedy Diesel LP/OPS Harness
Bosch Duraterm GP
Heath Turbo-Master
AD244 Alternator

Last edited by JMJNet; 08-28-2017 at 09:59 AM.
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