Thread: 2.8 tgv diesel (big 300tdi ) power loss any ideas?

Exhaust system seems to be fine, it's tucked away far enough that it doesn't get to much hammer off road.

Starting to look like I am up for a new timing belt, don't mind if it fixes it, I suppose I'm in to far to stop now!

Take the exhaust off before the muffler and drive around the block,it could be the cause. Pat

Quick update

Tried the cylinder test, disconnecting the injectors one at a time to see if it madea difference, and on number 4 it didn't so off to the mechanic we went for a compression test. number 4 was 'slow to come up ' was how he put it, basically it's running on 3 cylinders.

Got the head off this afternoon and took a look, expecting a fairly obvious valve, piston or crack to present itself, well it doesn't look new, there is nothing that looks like it could be causing the problem either.


I would be very grateful if anyone can give me an idea of what else I'm looking for, I was sure I would be able to spot the issue once it was apart, turns out not.

Thanks for any hints

The valve clearances should have been checked before lifting the head, a closed up valve would have taken minutes to adjust. Run a straight edge across all the valve stems, look for a valve sitting noticeably higher or lower on the low comp cylinder.

The bores should be carefully inspected. Any cylinder with a broken top compression ring will have dull marks below the top of the ring contact patch on the bores.

Valve clearances all checked and adjusted as part of the fault finding , non were far out and didn't change anything.

I will check the bores for wear marks tomorrow

Thanks

Just wondering if anyone knows of a good head rebuilder Brisbane north side, looks like it's a valve seating issue.

Whats the actual problem?,is the valve seat damaged or the valve not seating?. Pat

Looks like the valve is not seating the inlet on number 4 is almost as dirty as the exhaust side

I am hoping that's the problem as there is nothing else obvious