freightliner with detroit 60

color of smoke? year of engine? what symptoms led to the replace of injectors

 

I would pressure test the coolant system. Could have cut/broke an O-ring when installing the new injectors. if cooling system holds pressure i would check the vanes on the turbo see if you have any play there. would also look at the charge air cooler for leaks

 

I wouldn't bother with a compression test at this point unless it's down on power and/or using oil and has excessive blow by. First think I'd do is pull the fuel return line on the back of the head and put it in a bucket of fuel. Start it up and look for bubbles. If you find bubbles, run a hose from a bucket to the fuel pump so you can run it off a bucket of fuel. If the bubbles stop, then you have a problem from the pump to the tanks sucking air. If they do not stop, then you most likely have an injector not sealed letting compression get into the fuel system.

If it is not using any coolant or oil, the smoke has to be from fuel. You can have a cutout test done, just make sure they run it at different rpms and compare. If injector o-rings are allowing compression in the fuel system, a cutout test will show the wrong cylinder as having a problem. If #5 injector is allowing compression by, #5 will show OK. It is another cylinder further down the firing order than gets that aerated fuel that shows the problem. By running the test at idle and 1000 rpm, the bad cylinder will move to another hole or show more holes bad. This is a sign of a injector not sealing. If the bad cylinder is consistent at any rpm, then there is usually a problem with that cylinder.

 

The white smoke is it really strong smelling like diesel, I noticed you had a head gasket put on it could be a little out of time causing this smoke usually it will be very sluggish slow to power up and miss as its powering up then clear up mostly if it ever reaches high idle. It will also smoke and miss worse when first started and seem to get better as it warms up. I also seen an air intake temp sensor cause a white smoke and miss, did not set a code had to go to the data list with pro link scanner and actually view the sensor readings, the sensor was working only it showed 18F as air temp when actual air temp outside was 80 ECM was retarding the time cause it thought it was so cold outside. Just a couple things to check

 

bad china inj. going around buy new and save in the end. I put 6 re. con., in at home leased on at bennett motors Loaded light was low on power got to denver,CO. had em cked 2 leaked 4000.$ later 6 new ones from Detroit. driver before I got there had the mec. just put 6 rebuilt ones in 4 bad labor again to replace could have paid for new ones 1st time

 

Jumping from cylinder to cylinder is common with aerated fuel. Just Like I said, if another injector is not sealing, compression can aerate the fuel and mess up another cylinder down the line. It will usually change cylinders at different rpm, which is why it's important to run cutout tests at idle and 1000 rpm. It's also very important to check for bubbles in the return line before you conclude that an injector is bad. Just because a cylinder fails a cutout test, does not mean that you have a bad injector. It doesn't even mean that the problem is with that cylinder if you have air in the fuel.

It's pretty sad that many dealerships charge $100+/hr and do below average work. For what they charge, you should get top notch service from well training techs.