2.7tdv6 engine

gstuart · May 17, 2020

Grrrrrr said:
Every day is a learning day. Makes sense!

I bet Data is already out there with his scope!

lol, indeed I had to watch a good few videos as I also thought , nah , how the hell

but then as I watched more I think I started to get the understanding of it , how the oscilloscopes read the starter motors amperage draw as each cylinder got to it TDC

I think that’s about right ,famous last words, lol

Datatek · May 17, 2020

lynall said:
That sort of electrickery is way above my pay grade.

All the newer trucks pretty much run on pwm signals, so that is the next thing we have to learn, sorry I meant avoid!
I am getting to the age where quite frankly I could not give a toss about the newer stuff, it is interesting but mind boggling at the same time.

PWM in itself is pretty simple, it's the interconnection of critical and non critical systems on a common data bus that I think is crazy. I will not touch any of the new stuff.

Datatek · May 17, 2020

lynall said:
Im no expert, trucks are way easier than cars, cars a nightmare, you wont find many hgv mechs doing private work at the weekends, mention working on a car, and the majority of them will start walking backwards!

My son would agree with that, but he also got completely hacked off with Volvo bus electronics to the extent that he now drive trucks for a living

Datatek · May 17, 2020

Grrrrrr said:
Every day is a learning day. Makes sense!

I bet Data is already out there with his scope!

No way, I doubt the reliability & repeatability of using what amounts to electrical noise as a means of testing compression.

Datatek · May 17, 2020

gstuart said:
lol, indeed I had to watch a good few videos as I also thought , nah , how the hell

but then as I watched more I think I started to get the understanding of it , how the oscilloscopes read the starter motors amperage draw as each cylinder got to it TDC

I think that’s about right ,famous last words, lol

Worn starter motor bearings, worn brushes or commutator, high resistance connections, there are too many variables for it to be reliable IMO.

lynall · May 17, 2020

Datatek said:
My son would agree with that, but he also got completely hacked off with Volvo bus electronics to the extent that he now drive trucks for a living

We have a few ex volvo techs, they dont say much about their old jobs!

lynall · May 18, 2020

last night I had a Scania five cylinder in for a cruise control fault so thought well I have the diagnostic computer out I would carry out a cylinder compression test and a cylinder shutdown test
The cylinder shutdown test consisted of leaving the engine idling, the

test was the computer shutdown one cylinder at a time and stuck up a graph to compare the values
The compression test basically consisted of the computer turning the engine over and also producing a graph, It did this twice to make sure the results were consistent
Basically it was really boring and whilst it was doing a test I was reading a boating magazine!

gstuart · May 18, 2020

lynall said:
last night I had a Scania five cylinder in for a cruise control fault so thought well I have the diagnostic computer out I would carry out a cylinder compression test and a cylinder shutdown test
The cylinder shutdown test consisted of leaving the engine idling, the View attachment 209426 View attachment 209427 test was the computer shutdown one cylinder at a time and stuck up a graph to compare the values
The compression test basically consisted of the computer turning the engine over and also producing a graph, It did this twice to make sure the results were consistent
Basically it was really boring and whilst it was doing a test I was reading a boating magazine!

didn’t think it would take u long to have a play, lol

2.7tdv6 engine

gstuart

D3 Grandad

Datatek

Well-Known Member

Datatek

Well-Known Member

Datatek

Well-Known Member

Datatek

Well-Known Member

lynall

Well-Known Member

lynall

Well-Known Member

gstuart

D3 Grandad

Similar threads