The sweet sound of a healthy Tdi

[Thys]

The final on my Tdi's new injectors:

A sound as sweet as music when I fired up my Tdi with the new injectors, the diesel clatter as discreet as royalty in public, no smoke billowing out of the exhaust, and the power on the road as smooth as only a turbo diesel can be.

As a precaution I did a cold, dry compression test and the values were 12,4 12,4 11,5 11,5 kg/cm². I am happy with that, and the engine's oil consumption is negligible.

Why would two injectors fail on an engine with 183 000 km on the odo? I have two possibilities:

1 The sock, jamming the no 2 inlet valve partially open, and then snapping the rocker shaft, may have resulted in crazy mixtures in no 2 & 3 cylinders, with the engine idling and doing three trips round the block.

2 When I collected my Tdi, the previous owner informed me that one injector blocked, and he had all four replaced with new injectors. The LR specialist invoiced him for 4 new injectors. This was one year ago, 10 300 km later. Looking at the condition of the injectors, I am certain that they were not new, probably cleaned, or replaced with second hand injectors. Two of the brass washers were also installed the wrong way around.

Any way, I replaced them with new ones, and now have the confidence that the installation is done correctly.

[cipx2]

Looks sweet... but it will sound sweet only if you'll let us hear the sound A sound recording would certainly help

[RRX]

Just done the ones on mine and the difference in driveability is very noticable. mine were overhauled and the tips i got back are just covered in black gunge

[JimAttrill]

"As a precaution I did a cold, dry compression test and the values were 12,4 12,4 11,5 11,5 kg/cm². I am happy with that"

Should he be?

[cipx2]

Judging by the values themselfs, he shouldn't. These are petrol engine values, more like 8-9 compression ratio engine. I think there's a reading error, wrong scale, math error or something. Otherwise I don't think that 300tdi would start from cold.

Judging by the difference between cylinders, it's acceptable. There's an 8% difference, not great but still under the lowest limit of 10%.

[Thys]

Judging by the values themselfs, he shouldn't. These are petrol engine values, more like 8-9 compression ratio engine. I think there's a reading error, wrong scale, math error or something. Otherwise I don't think that 300tdi would start from cold.

Judging by the difference between cylinders, it's acceptable. There's an 8% difference, not great but still under the lowest limit of 10%.

I forgot to mention that the compression tester was a cheapy. I had to push the end into the opening by hand, was more intersted in the deviation between the readings. Since there is now loss of power, and she stars easy, I am still not to upset.

[Thys]

"As a precaution I did a cold, dry compression test and the values were 12,4 12,4 11,5 11,5 kg/cm². I am happy with that"

Should he be?

Jim, knowing the high comprerssion ratios of a diesel, I presume the compression test is best done with na compression meter that has to be clamped in position, otherwise I must make an appointment with you and have a proper test done.