Not so much dead but not right at all

[Edubcee]

Hi
I've had a play today and thrown a new diesel filter on with some atf in it and its now running on 5and3/4 cylinders ish
Its on 6 cylinders but rocking in it mounts noticbly, in the car feels like your being rocked rather harshly by a gang of yobs
Tried cracking off an injector while running and each one dropped out as each pipe was cracked
I did notice that the old filter had a fair amount of brown snot like stuff in it and was only half full of fuel so not sure if that means I've got a line blocked up with gunk or something maybe from the tank
Any more help will be appreciated as at the moment I have a rather large Volvo shaped door stop
Kind regards
Eddie

[Goteborg Vapenfabrik]

There was a recent post here about some d24t rocking. It was the injection pump. A fresh set of injectors would be money well spent, but it may not fix the problem. Removing the fuel tank on a 700 isn't a picnic but not as bad as a 200 in my opinion. Your tank may have some nasty buildup. Tom Bryant is your friend on injection pump rebuilding. But he's stateside.

[RedArrow]

Reading your initial post, my very first thought was: I would ask you about that diesel filter...!!! It is highly suggested to keep a new one in the trunk, always (big trips must have it).

A clogged or clogging diesel fuel filter is the BEST recipe for failure sooner or later. It is not the question of `IF` but `WHEN`. Driving my car I could feel when the filter isnt in best shape any more... I know it sounds totally crazy but i do feel something that is similar to limited fueling, plus i get extra smoke and slightly less power, sometimes followed by taking a little more time to reach certain speeds (im talking about 65-70-80mph, nothing at the slow speeds).

Did your car develop your problem slowly or did it come suddenly?


Please make sure you have a brand new one, never ever* fill it up using the fuel that came out of the old filter. Use any Dexron3 (DexronIII) type ATF fluid again, or Lubro-Moly diesel PURGE. It cleans out your system (pump,injectors) if it isn`t too late (if not super-clogged up ).

If injectors are out again, you *may* check compression by a Tester, available at H@rborFreight for around $30 (best results come with adjusted valves so dont even start a new project ).
Best bet for now (step1) to try running your car using a brand new good quality (bosch, mann, wix ?) filter, idling the car from a jar or can, set up both fuel lines into that can, making sure the filter is installed ALSO, while letting the engine run from that jar for as long as the fluid (diesel purge or atf) disappears... save some hassle: dont let air get in at the end)

Your injectors and the pump itself may thank you for doing it but it may be too late if IP is tired or has some internal damage from receiving contaminated fuels in the past.
Rational/logic diesel thinking will help you out to decide what to begin with, and if your issue isnt about a bad pump or dead injectors, the car can get back to normal pretty effortlessly and cheaply.

Luckily in these cars there is plenty of room under the hood for a fuel container so make sure you keep both eyes on the fuel quality first.

Rechecking the new filter is another thing I`d do, since they can and will get dirty very very soon IF fuel is bad.
Idk how it was half full only when you removed it. Check ALL fuel lines, joints, clamps (if any), it wont help you if air is introduced into the system anywhere from/between tank to filter to ip to injectors, anywhere.

PS. This has been posted several times on this forum, but, also check there where the filter goes, remove crap, if any, you may find an o-ring left there from the previous filter. :`) That happens...

All this advice is Zero specific help, I know, very basic but it is always useful to recheck all things, starting from the simplest problem, going towards the more complex (and more expensive).

I agree with the ones above, on Tom, but dont make him too busy as I`d love to get pumps fixed as soon as I hunt some cash OR hit megamillions.:~)

I hope you will post again, then share videos of the `door-stop` running smooth very soon.

[ngoma]

Originally Posted by Edubcee

Tried cracking off an injector while running and each one dropped out as each pipe was cracked....

Good, so let's leave off condemning the injectors for now.

Originally Posted by Edubcee

the old filter... was only half full of fuel...

Alright, now you've given us another good clue. Means air intrusion into the fuel, which for sure will cause rough running, stalling, hard starting, low power, inability to rev, etc.

If your car still has the clear fuel line going into the IP inlet, watch it carefully while running to see if there are any air bubbles, even tiny small ones. Holding a flashlight behind it can help you see them.

[Edubcee]

Hi
After having more of a play she's back on 6 but still jogging about
I did notice the engine mount fuel pump side is dead so I'll be doing that too as is probably not helping
I did check the clear fuel line and no bubbles the new filter has remained full so I was thinking the water trap on the old filter may have been letting air in or a bad mating seal
Power seems good till 4-4.5k now and trails off but no massive smoke or bad noises ( as quiet as a d24t could be)
I was thinking about temporarily turning up the fuel to get the pump running harder to clear the crud out of it
I take it I just remove the tamper seal turn the screw then adjust idle to suit ( any chance it will try to run away if I adjust)
I figured make it smoke a little take it for a blast then turn it back down
Cheers for all the help
Eddie

[ngoma]

Originally Posted by Edubcee

I was thinking about temporarily turning up the fuel to get the pump running harder to clear the crud out of it

Sorry, it doesn't work like that, if what you're thinking is like what the homeowner does after the city works on the mains outside the house. Opening up all the faucets until the water runs clear. Turning in the fuel screw doesn't "get the pump running harder" and doesn't "clear the crud out of it."

Edit, after rereading your last post again: Maybe you meant to clear the carbon out of the cylinders? Unclear. Anyway, if so, just leave the IP as is and take it out for an Italian Tuneup. Fun!

Congratulations on your good work so far, You have:
1. Identified against a possible injector/IP/cylinder problem by noting equal RPM drop when loosening each injector union nut;
2. Verified no air intrusion into the IP;
3. Replaced a clogged (and possibly faulty) fuel filter;
4. Identified a faulty motor mount.

Replace that mount; it will definitely help smooth things out.

[Edubcee]

Hi
Yeah meant to make it run hot so I could add a lot of boost and decoke it ( do the same on the diesel locos I work on) sounds harsh but does work
Any way I actually managed to get it hotter than 1/3 of the way up the gauge like where it normally sits and with a hell of a lot of smoke its cleared itself out a treat and is much much better. The fueling and boost are now back around where they should be and runs clear did find a massive boost leak between the turbo and inlet so I'll be doing that before overworking the turbo but thanks to peeps help and reassurance she's alive again
Just got to find out what engine mount I have as eBay is a minefield of varying types
PS I was surprised how much poke one of these things can have with a lot of fuel and boost wouldn't want to run it everyday like that as can imagine hg would die fairly fast but good fun none the less
Thanks again
Eddie

[ngoma]

Good work!

Your 1990 probably has the old style smaller rubber motor mounts instead of the larger hydromounts but::: Post a photo of your current motor mount, we can help you decipher a suitable replacement.

See Attaching Photos Sticky for help attaching photos.

You'll want to run that engine at recommended operating temp. (factory thermostat is 186*F IIRC) which should register the needle halfway on the temp gauge. Even the good quality tstats can fail. Running undertemp can encourage combustion chamber and ring landing coking and carbon buildup.
http://d24t.com/showthread.php?t=1559
You can use an infrared no-contact thermometer on a suitable flat black surface, such as the radiator or rad hose, to verify the operating temp.

What kind of injection systems do your diesel locos use?

[Edubcee]

Hi
Sorry its been a while been mega busy having a 10 week old son and doing 12hr shifts at work is taking its toll
I'll get a photo of the motor mount tomorrow hopefully
Our locos run v16 MTU diesel engines with 4 KKK turbos
Their derated for our application so once they coke up they get HotWired by us as their all elctronically injected so we hack in alter the fueling and take all the boost restriction off and give it full beans till the smoke clears or it fires flames out the exhaust (saves 28 hours of miserable soot scraping but don't tell my boss)
The ovlov now feels slow compared to what it was with all the fuel and boost wound up was wondering if it was worth winding the on boost fueling up a notch as low down its perfect now but feels a bit lack luster high up the range doesn't want much just a tweak to get it where it should be
Is it screw in for more fuel or screw out I can't remember
Thanks again for the help