Thread: International Acco 1900 VT 190 - Help Please!

low on compression, give it a compression and leakdown test..

Cheers Dave, I was hoping you might comment, it had an inline rebuild about 60,000kms ago so I thought (was hoping) compression wouldn't be an issue. The smoke onset came on fairly suddenly - I think after I started putting farm diesel into the fuel tank.

I'm supposed to be using it for seeding over the next few weeks so am I likely to cause any damage if I keep on using it and then do the repairs after seeding?

sounds like injectors to me.............

you might have had a batch of stale diesel...

sample the tank of diesel and put the fuel into a smaller diesel engine of the same tech vintage and see what it does.

if that smokes and cleans up on replacement fuel then you have fuel thats gone off and isnt burning proplery. I havent seen fuel gone that bad in years but I occasionally get it when I get the blend wrong on my WVO mix for the ambient temp.

if its the rings gone you'll start getting some oil usage, if its valve contamination you'll lose power and starting will get harder. In anycase unless its bad fuel running it wont help it and while its smoking you'll be hurting it so you want to throw every trick in the book at it to get it to warm up quick, start it with the radiator blanketed and load it up as soon as its got oil pressure then remove the blanket once its warmed up.

If its injectors you'll be up for replacement/repair anyway so thats not a problem.

check the turbo outlet for oil to make sure its not starting to drop oil out of the turbo compressor then crank it up... check the exhaust ports temperature on startup the cylinders that have dodgy injectors (it would be rare for them all to fail at once) will warm up slower than the rest and when at operating temp will be hotter than the rest.

Thanks Dave, I might try dropping the fuel as the first measure - I only bought the vehicle fairly recently and it was after I added the farm diesel to what was already in the tank that the problem started. I'll check the turbo again however that was rebuilt fairly recently as well so I hope that's not it. At the moment the truck starts after about 1 crank and doesn't feel like its running rough at all - hence why I was a bit puzzled as to what was going on. Will keep you posted and thanks again for the advice. JP

Update - I ran a few checks on the vehicle this afternoon, I didn't have a large enough container to drop the diesel so I might try to do that once I can get a new filter on Tuesday. However when I ran the engine for a few minutes the exhaust port on the drivers side front (presuming thats cylinder no.1) didn't heat up anywhere near as quickly as the others, thought that might have something to do with the breeze coming back off the fan - however when compared to the other side front piston it was noticeably cooler.

I checked for blow back from the oil filler and that did not appear to be above normal. I also noticed that when de-accelerating the white smoke gets really bad before plateauing. Presuming it is the no. 1 injector how hard are they to replace? I'm presuming that they are located underneath the rocker cover? The closest I've come to doing anything like this before was in assisting someone to replace the injectors on a JD Tractor, and those were easily accessed from the side of the engine block.

Cummins usually have a camshaft lobe, follower, pushrod, rocker arm actuated fuel injector, remove the rocker cover and check that the pushrod and rocker are moving with engine idling. Sounds like to me that you have an injector problem, if you have no idea of how to remove, replace and adjust then leave it to a specialist, good luck, Regards Frank.

from the interporn it looks similar in setup to the detroits when it comes to the injector configuration.

all Im going to say is you have fun with that. you want to hope that its a rocker arm adjuster thats driving an injector or 2 has become unadjusted and is firing the injector massively late and without full pressure.

if you have to pull the injector... Check and then double check the bump clearances.