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

**PAT303** · 23rd February 2016, 11:14 PM

If you've checked all the mechanical s maybe it's time for a dyno run to find whats what. Pat

**justinc** · 24th February 2016, 01:43 AM

Timed properly?? Retarded timing will give huge egt and low power.

Jc

**finallyrangie** · 24th February 2016, 08:12 AM

Originally Posted by loanrangie

High egt means low boost, how is the turbo ?

Boost gauge at the intake says a nice healthy 19 psi at 1500 rpm, so I am hoping that's not a problem .

**finallyrangie** · 24th February 2016, 08:15 AM

Originally Posted by justinc

Timed properly?? Retarded timing will give huge egt and low power.

Jc

Timing belt is 50k old, maybe time for an early change

**roverrescue** · 24th February 2016, 12:29 PM

Im with JC and have been all along

-check the FIP plunger lift at TDC - that is the best (most accurate) way to ensure FIP timing is correct
-cam timing youll need to take the front case off

s

**finallyrangie** · 24th February 2016, 01:28 PM

Originally Posted by roverrescue

Im with JC and have been all along

-check the FIP plunger lift at TDC - that is the best (most accurate) way to ensure FIP timing is correct
-cam timing youll need to take the front case off

s

I didn't realise the timing could be checked without taking the front cover off, I will do a search for that as soon as I get chance

Thanks

**loanrangie** · 24th February 2016, 04:20 PM

Originally Posted by finallyrangie

I didn't realise the timing could be checked without taking the front cover off, I will do a search for that as soon as I get chance

Thanks

Thats injection timing not cam timing.

schuy1 · 24th February 2016, 08:51 PM

Originally Posted by finallyrangie

Sorry about that , doing it on the phone and I'm a bit technically challenged

Ahh right. Yeah well Im a bit old school here, still use a PC to access the internet! How ancient mariner is that?

and for me that text is LOUD!! can read the laptop screen across the room

Ya'll need to live where there is no 'phone access for a while

Cheers Scott

**finallyrangie** · 25th February 2016, 07:20 AM

Originally Posted by roverrescue

Im with JC and have been all along

-check the FIP plunger lift at TDC - that is the best (most accurate) way to ensure FIP timing is correct
-cam timing youll need to take the front case off

s

Had a quick look last night, doesn't look like I have the flywheel locking marks on this combination, what would be the best way to find tdc, at the moment I am thinking of taking out number 1 injector and putting a bit of ally wire in as a gauge and just winding around until it's at the top of its travel, should be pretty obvious if it's 180 degrees out, then adjust to get a 9.5 drill bit into the pump locking hole.

That's the plan, I am more than happy to be told where I will be going wrong

**roverrescue** · 25th February 2016, 10:21 AM

I guess its a crap shot over pulling an injector or pulling the rocker cover?
Either will give you definitive TDC

If your flywheel is missing the timing groove - praytell how did you do the timing belt last time?

With regards to FIP timing a drill bit through the front is the quick easy loose manner to check timing.
Removing the centre cap from amongst the FIP fuel lines, using a dial test indicator and plunger screwed into the centre cap and physically measuring the plunger lift as you rock around TDC is the accurate way to assess/adjust FIP timing.

If your flywheel does indeed have no grooves marked into it - I would have a very low threshold to pull the timing case, assess TDC (mark the flywheel) and correctly time the cam and FIP.

There really is not too much tot he timing of a tdi
cam is either right or off by a tooth
FIP is infinitely adjustable within a certain range and this will effect EGTs and power.

You have obviously already payed for head work on the old girl... timing is likely where the problem will lay

s

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