Hi dicrobira

Oil Slick and 7upuller have had this friendly fight going on for some time. Not Hatfields and McCoys. I bet if you wait a few days, they will pay you handsomely to come pull your 3T back to the shed. With a little goading they might even rebuild it for you. LOL Great guys are hard to find, sounds like two of them.

Casey

Hey Casey,

I realize OilSlick calls me Pops, but that's his dream. I guess I could adopt him, but that would mean I would have to call him "Son".......sorry for the delay. I just got back from using the rest room. Had to pull my head out of the toilet after reading the sentence above! Scary...I know!
Roflmao

Ahhh, just kidding around OilSlick...your alright, no matter What I say about ya!!! Lol

Between rebuilding a house for my son and taking a new role in my job, I have not had a chance to get back to my D7 until now (Christmas break).

So, following OM's advice:

"Old wrote:

If the pony doesn't bog when attempting to start the pony clutch is slipping.
I wouldn't give up on starting it just yet. The three section oil/scavenge pump system should still be able to deliver oil at some pretty steep angles. Even if oil pressure was lost bearing freeze at idle would not be as severe as under load.
Bar it over a few more revolutions, tighten up the pony clutch and have another go. If oil pressure doesn't come up in reasonable time then shut it down and you know the task ahead.

I tightened the pony clutch after letting it sit all year only to find the float needle valve stuck shut and a broken fuel line on the pony. Also, the coolant was empty. The crankcase oil was not overfull, but it was thin. I do not see where the coolant leaked out, and I added 6 1/2 gallons. I fired up the pony and the main turned then started with little hesitation.

BUT, there was a significant knock in the main which seemed to be coming from the cylinder closest to the operator. I drove it about 50 yards then parked it to change the crankcase oil. I was unable to break loose the drain plug, so I fired up the main again, and decided to drive it back to the house. After 15 - 20 minutes of running, the knock seemed to quiet and became intermittent, so I tried to push some dirt near the house. The power was good, and I ran it for another 20 minutes.

Then, something bad happened. About 10 minutes after a restart (due to a stall while pushing) the knock came back worse than before and the power dropped. I parked the D7. While running, the temperature, fuel pressure and oil pressure were all good on the gauges. Also, the coolant level did not drop any significant amount.

I have much experience repairing gas engines but little for diesels. I will search for a similar case on the forums, but I would appreciate further guidance on the probable cause and solution.


I appreciate all the support; you guys are great.
I was asked in a PM about 8 months ago if I was offended by the criticism of some responders. No, I am not. I would need to have feelings in order for them to be hurt.


Here is 7 second video of bad…
vimeo.com/150317583

well thats all good news at least I think it is glass is always half full with me
she runs and runs well enough to get back to the house dunno about your knocking sound but sounds like its firing out the exhaust or something a bit like a jake brake on a truck but only on one pot so I dunno maybe not as bad as you think stuck exhaust valve ??????????

I would drain the oil when you can get the plug out and have a look and see whats floating in it if the is full of stuff that shouldnt be there maybe pull the plates off the sump and have a look in the sump maybe buy your self one of them bore scope things they have light on the end and are less than $100.00

sounds like your heading the right way

Paul

Simplest test you can do is to start the engine and with it idling (and knocking?) loosen each injector line in turn. If it's an injector problem, the noise should go away when the line starts spraying fuel. Cover with a thick rag to keep fuel spray down while you are loosening lines.

The thin oil is a problem. Most likely has some fuel dilution. It is one thing to use a light weight oil in cold weather but another thing entirely to keep running diluted oil. Have a D318 to change this winter as a result of just that situation.

I know it's hard to tell by audio from a phone, but sounds to me like that sucker is about ready to poke a rod out the side & open up an inspection port in the block...that ain't opportunity knocking...

Agreed, that knock is really bad. It ain't no injector. Time to start digging.

Sounds just like my Cummins in my KW when #2 rod bearing failed. DO NOT START IT ANYMORE!!

Forgot to mention the blowby. The louder knock was accompanied by a fair amount of blowby from the crankcase breather. I read through the other post, "941 cat started knocking," and I fear it is not an injector. I experienced thrown rods in gas motors and don't want to see it again with this one. I will dump the oil, look for metal in the filters then try to get an inspection scope and take a look inside. Hopefully, I will find time to dig-in over the next couple months. I am considering looking for another D6/D7 to do some work in the meantime.


I will keep you posted as I progress.
Thanks again for the advice
Bob.