Problems Shutting Down

[SLang]

I recently put a new shut-off soleniod. When first installed it worked fine. Now it is having trouble. When I go to shut down, the the soleniod releases. The engine stays running until I press down on the shut-off rod on the pump. I have tried disconnecting the shut-off soleniod wiring harness to verify that there is not a small current keeping it on. I have also adjusted the Hiem joint on the soleniod all the way out with no luck. It seams that the soleniod spring is not strong enough, but I'm not sure. It takes a fair amount or pressure from me to shut it off also. Any sujjestions?

 

[Joe G.]

You can test it by disconnecting the large three wire connector that's behind the air horn next to the master cylinder. Then put a ground with a test wire to the terminal with the black wire and 12 volts to the white. This is the pull on coil. The solenoid should pull up. When you disconnect it then it should drop. You should do the test with the rod disconnected from the lever to make sure that it's the solenoid failing and not some sort of linkage bind. This is a high current circuit so your test leads should be #10 wire at least. The third wire in the connector is a small wire for the hold coil.

 

[rhoads]

shut down

First lets all get on the same page>

All you did was remove and replace the unit it self. nothing more .

In this case, then it would not shut down EVEN when you parted the weather pac 3 wire connector. .

If this is the case the spring is weak/broken OR the plunger is hangin up in the bore. I would return it for a defected part.

NOW you will void your new part warranty,BUT the only thing that hold this thing together is the rubber boot held onto the body by that little plastic tie strap. If you choose to clip it it should pop apart. If the shaft slides in an out freely then the spring is at fault.

Just a question why did you replace it in the first place?????

 

[illflem]

Since you have a new solenoid, which was likely replaced needlessly (most are), it should shut your engine down when disconnected unless it was bad to begin with. The only other problem has to be a binding or out of adjustment shut down linkage.

 

[Turbo Thom]

As TDRRAM said the boot is the ony thing holding it together. It is possible the plunger can be lubed with a dry lube for easy operation. Broken spring is not likley but not out of the question. If problem's not there then all that is left is the relay.



. . Preston. .

 

[SLang]

I replaced the soleniod because I lost the Hiem Joint on the other. I could not find a replacement Hiem Joint. Even though I could have made one, the boot on my old Soleniod was all but trashed. A few more miles on it and the spool would have fell out of the coil and the soleniod would be junk.



Now back to the problem. The truck does start fine every time. The problem is shutting offf. This is either the spring or the linkage. Now the soleniod is new so I'm going with the assumption (wrong or not) that the soleniod should be fine. While I was waiting on the new soleniod I was shutting my truck off manually. Not a big problem for me. When I put my new soleniod on it worked for a few days then gradually stopped. Now the soelniod will not shut the truck down. If the spring and linkage is assumed (there's that word agian) to be fine is there an shut-off adjustment in the pump? It seams that it takes a fair amount of force to shut the truck off manually. If there is no adjustment then I'll be forced to change out the soleniod. If that does not work I'm back to square one.



Scott

 

[Turbo Thom]

Scott:

The spring is what stops the engine. The solenoid is entergized to pull up. Then a holding voltage/circuit holds the plunger in place. When the key is turned off the current stops and the spring takes over, shutting off the fuel supply. If the engine does not stop you must have 2 fuel supplys to the engine. And I can't help with the location of that. Don't have a clue.



. . Preston. .

 

[dalton4]

I was also having a shut down problem. It started out by running a few seconds after it was turned off. Time duration increased to about two minutes for shutdown. Trouble was caused by a dirty/binding linkage.



As suggested by Fleming, and from the above, also check the linkage.



Jerry

 

[rhoads]

linkage

IF we were shutting of the eng. manualy be fore we changed out the sol (with no problem) and then after the change (at which time we did nothing else) and every thing worked for a time then the trouble should be in ihe new solenoid-----with the fact that even with the connection un hooked you still had to pull down on the plunger-----On a couple 855 cummins in the past i have pulled the feed voltage and the eng still ran __With out the thumb screw turned in. . a fluke of electrical theory but a new solenoid and every thing was back to normal.

UNLESS you did something else I call and get a different solenoid. .