Valve train working while cranking?

 

the used ATF may be a different story than new ATF???

the valve train seems to be working properly. still haven't seen under the driver side VC, but when cranking for the compression test you would think if there was a valve issue you would hear it while cranking. just a thought... i'm not going to say that the valves on the DS are any good. for all i know the other side may show 0 compression across the board.

We are safer with either than most are. we do wait for the GP's to cycle off before we give it a spray. not saying it helps too much but i imagine it helps a little to prevent blowing up too much stuff with it.

here is a question. these trucks take a lot to stay running so would just a small spray from an either can be enough juice to keep an engine going if it had barely any fuel trickling in the cylinders??????? Break out 2 cans and try it. haha. or break out the nitrous bottle........ JK!!!!!

 

just a small squirt wouldn't keep it running. to keep it running you would have to continuously keep spraying it in. if the injectors are not atomizing the fuel it could flood the cylinders.

 

I would follow the 0 compression thing.
Thing is its 0!
Does it have alot of blowby? building cc pressure?
I would guess no.
My first thoughts would be valve or guide.

Bill

 

yes it is 0, yes it does have blowby, not sure how much cc pressure there is, but it shouldn't be a valve or the guides. the oil from pulling the injector in that cylinder gave us compression after we sucked the oil outta the cylinder so obviously the oil was sealing up the rings. i think it has a cracked ring myself. and just to clarify what he is doing... he is just trying to get it to keep running for the guy. the guy doesn't have a lot of money to get it fixed or get an engine for it or another truck. he could care less if the truck absolutely annihilates itself either so he just wants it to run. whether its missing on one or two cylinders or not.. the guy simply doesn't care about his truck

 

Yes its possible, but even with broken rings it would have some compression
unless the bore is completely trashed.
The compression test might have not had anything to do with the oil.
It could be heat/friction related.

You have access to a bore scope?

Bill

 

a diesel will emit white smoke when "lean"

 

And in cold ambient temps.

 

i do not have a bore scope. not sure that cody does either, but the compression test was 0 on that cylinder and was the first one we tried so it was dead cold. did the others on that bank then pull that #7 injector and did our stuff and put the injector back in, checked compression immediately after blowing the oil out of the cylinder and it came out with 170? lbs of compression. we were all baffled so we ran it again about a minute later, dropped to lower compression, ran it again and it dropped some more, ran it again, dropped some more. just kept doing that so i don't think its the heat.

 

Above statement is why i would look into the exhaust valve end of things.

Bill

 

Could you explain why the exhaust valve would do this?????? i have never heard of that before..

 

When your squirting ether at it and/or just trying to start it, does it cough or smoke or do anything besides spin?

If it just spins when you're squirting ether at it, I wouldn't know what to think!

 

Okay guys, I'm gonna try to answer each one of you the best we can so we don't run ourselves in a loop. I can only see so much history when I advance post so I may have 2. LOL

Jim, I should have said, someone had previously worked on it, I'm guessing before he bought it. The fuel lines they used were just gas lines. They were infact swollen and deteriorating. Also, the guy was told by "an old diesel mechanic" that ATF would clean the injectors. So he proceeded to dump ATF in the fuel bowl spilling it all over everything in the valley, which is why all the weather pac connectors at the IPR were thrashed and wire loom was mushy at best. However, I didn't know diesel carried the same properties as ATF that would eat rubber, so I guess Travis' thought about eating injector orings is not correct. Duely noted, but I'm also not nieve enough to think this is the only guy to run ATF, so it would prolly be safe to say they would be okay.


Action, yes, I have several IPR's I can try. But my first encounter with the truck I pulled it and put new orings on it. Of course that's not to say it's not broken or non functioning inside. So I guess I should try that too. I had thought about it, but at that point in the night, I really didn't feel like pulling the fuel bowl again to go at it. So in my next installment with the truck, I will.

Heli, I'm pretty sure there are no glow plug tips stuck in the valves. At least for the passenger side. I pulled all glow plugs doing the compression test, and all had their tips. And the ATF at this point should no longer be an issue.

Steve, as far as the valvetrain on the passenger side, it's all working correct, I have to have the valve in the right position to get the compression tool on, so we had several "bump it" sessions to get them in the right position. But don't know on the drivers side.

heli, I may infact had flooded the engine with ether. I gave it a serious dose to the turbo, a few times. So that may be the case, slim, but maybe.

Bill, I agree.....it's zero, let's be done with it. But I just want it to run on 7 cylinders. And it does....for a few seconds. And I want to reitterate, and I'm not yelling at you bill, I just want everyone to make sure and read it.

WHEN IT DOES RUN, IT RUNS AS GOOD AS ANY MOTOR ON 7 CYLINDERS, FAILY SMOOTH WITH A MISS. SO IT WILL RUN, WE ARE JUST TRYING TO FIND OUT WHAT IS SHUTTING IT OFF.

Again, not yelling, just want to make sure we are all on the same page. LOL And yes Bill, TONS of blowby. Less with that injector on the dead hole unplugged.

Bill, I do have access to a bore scope, but do not own one. However, this borescope I have access to, will not fit in the injector nozzle hole, or glow plug hole. So I'm out of luck on the bore scope.

Bryan, yes it can emit white smoke when it's lean. Not sure what bearing that has here, but I do know this. You are in here trying to help us figure it out and I'm gratefull, thank you sir. And Welcome to FTE we are glad to have you aboard.

Bill, on the exhaust valve, are you thinking it's bent, or not seating correctly, but moving enough to provide varied results? This might be valid, because when it does crank, or is running, you can hear a pronounced "whoosh" on the compression stroke. But again, the compression on that one cylinder is not what's shutting it down....or if it is, I can't fathom how.

Cow, it would barely acknowledge that it had been invaded by ether. So yeah, it makes no sense. I'm going to stick with me flooding it on that front. You could run a plastic model engine on ether. LOL But like I said, when it runs, it runs fair.

Guys, all are great ideas, and I invite you to keep them coming. But with what we've discussed thus far, I'm still hesitant to either make him trailer it back, or travel the 60 miles to him and try it. He has to borrow truck and trailer, and I of course have less than zero time. But make no mistake, I will get back on this truck soon, so I will take all ideas with me on a list and go through them one by one.. Your help and info is ALWAYS greatly appeciated and I will keep pushing for a solution.

 

Valvetrain would be my guess Cody. Thats where I think you should investigate. If the piston was cracked or the rings were gone you'd know while it was running those few breif seconds. There'd be oil and smoke everywhere, atleast in my experiences with the 7.3's anyway. Let me know if we can be of any help.

 

ok, screw the dead hole, you need a scan tool to get pid data to find out why it stops running at this point.