Starter not disengaging, shim it?

Jordi · May 11, 2024

So it has new oil, filter, coolant, cranked by hand fine.

Put some power to it and it span over on the starter, sluggish but span.

Turned the ignition off and it kept on spinning.

Checked around and the starter hadn’t disengaged from the ring gear. Thought the solenoid or starter might be jammed. Soon as i cracked the bolts to drop the starter out, disengaged.

Presuming the starter sprocket was wedged into the ring gear.

No weird noises, it engaged fine just wouldn’t disengage.

Does this sound like a shim issue? Had the starter out and there are no shims in it.

Its a 6.2 diesel incase that makes a difference.

Thanks.

Ricko1966 · May 11, 2024

Let's let ranch welder answer this one, he's so smart. Anyway starter that continues to crank is usually a low battery or dirty connection . The high amperage draws overheats and sticks the points in the starter solenoid together Try a fresh battery. If you still have a problem clean all the connections at both ends of the battery cables and engine,frame,body ground. If the problem still persists,attach a remote start switch at the starter and engage it that way,if the problem is gone it means you still have a supply problem,as in ignition switch sticking. edit.(ignition switch or starter relay sticking)If it's not gone replace the starter, the solenoid contacts are sticking.

fast 99 · May 11, 2024

Ricko1966 said:
Let's let ranch welder answer this one, he's so smart. Anyway starter that continues to crank is usually a low battery or dirty connection . The high amperage draws overheats and sticks the points in the starter solenoid together Try a fresh battery. If you still have a problem clean all the connections at both ends of the batter cables and engin,frame,body ground. If the problem still persists,attach a remote start switch at the starter and engage it that way if the problem is gone it means you still have a supply problem,as in ignition switch sticking.Ifit's not gone replace the starter the solenoid contacts are sticking.

And here I thought the Boss Mustang folks were the only ones that didn't get along, silly me.

Jordi · May 11, 2024

The batteries are almost dead in it. Been using the 4.7 V8 booster pack.

Have a look at all the connections tomorrow.

Jordi · May 12, 2024

Bigger batteries sourced. Big boost pack sourced.

Some circuit testing done.

Permanent live is good. Earth is good. Ignition live seems good, have power on/off as the key is operated.

Turn the key, starter engages. Release the key, ignition off starter stays engaged and continues to spin until the battery is disconnected.

Turn the motor a fraction on the crank with a ratchet and it disengages almost instantly.

Ricko1966 · May 12, 2024

Couple ways of checking this. 1, put a test light to the solenoid lead and ground.Crank the engine if the engine continues to crank after you turn off the key,look at your test light,if it's still lit your solenoid is getting power when it shouldnt. Id suspect the ignition switch.edit( I'd suspect the ignition switch or starter relay). If the lights out and its cranking I'd replace the starter. Another way would be engages the starter with a remote start switch,if you know how to short a solenoid to engage it that works too. If the starter continues to crank,replace the starter.

Buck69 · May 13, 2024

Ricko1966 said:
Couple ways of checking this. 1, put a test light to the solenoid lead and ground.Crank the engine if the engine continues to crank after you turn off the key,look at your test light,if it's still lit your solenoid is getting power when it shouldnt. Id suspect the ignition switch. If the lights out and its cranking Id replace the starter. Another way would be engages the starter with a remote start switch,if you know how to short a solenoid to engage it that works too. If the starter continues to crank,replace the starter.

Is there not a start relay is this system that is known to stick as well?

Ricko1966 · May 13, 2024

Buck69 said:
Is there not a start relay is this system that is known to stick as well?

Buck has brought up a very good point. If that vehicle has a starter relay, look it up by year and model to check. I will edit my other 2 posts to include troubleshooting on a vehicle with a relay. If it turns out to be a voltage supply problem,post back up so we can walk you through testing the ignition switch and starter relay.

Jordi · May 13, 2024

It’s a bit of a frankentruck as it’s a C10 body on a K30 chassis.

Any idea or photos of where this relay is/should be?

Buck69 · May 13, 2024

It is on a bracket in dash just left of the ashtray on mine, but it is CUCV (originally 6.2). They do not have the same harnesses. Just brought it up in the event it was an oversight.

Ricko1966 · May 13, 2024

Yea, I didn't know what he had, I thought only CUCV had starter relay,but IDK and my advice to look it up by year and model isn't great considering it's built from 2 trucks.

Jordi · May 14, 2024

Thanks for all the info chaps.

I’m away with work till fri/sat but will do more testing when I’m home and report back.

Starter not disengaging, shim it?

Jordi

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