OKA365 power loss

Hi everybody, need some information from the brain's trust.
OKA365 on route to Lake Eyre via Gt Central Rd. yesterday noticed fuel boost low, turbo temperature high, didn't think much of it at the time, but today after leaving Kulgera, heading to Finke, noticed could not get fuel boost to come up over 6psi, once in 5th gear turbo temperature was rising. Stopped changed fuel filters, nothing really out of the ordinary there, a little bit of fine grime in the secondary, primary looked fine. We decided to head back to Kulgera to get mechanical advice, as they were unable to help, we checked for gauze in the fuel pump, no gauze, fuel flow from cranking engine out of the secondary, no hoses sucking in, no evidence of leaks of any sort noted. Any ideas on what it may be? We are going to head south on the bitumen to Port Augusta. New air cleaner last week. Relying on wifi, no phone service, will check back regularly as possible.

Cheers

Forgot to mention standard Perkins.
Cheers

I'd check all the intake system very carefully as it would seem you might have a leak between turbo and intake, as you have lost boost, fuel is too much for air being supplied so higher EGT's.
Split or loose hose connection, intercooler leak (if fitted) or similar.
A blocked intake before turbo might also cause the same symptoms.

Hi Ewart,
From your description I would agree with Peter as low boost and high EGT's indicate too much fuel to the air supplied.
Yes you need fuel to create temp to create boost but all in the right quantity/mixture and so if you lacked fuel you would get low boost but also low temp.
What would confirm it is do you have more black smoke than usual.
Martyn

I agree with Peter and Mort,just as something else to try in case you have a faulty new air cleaner try running on just the inner if still the same try just the outer ,just a thought .

Cheers Dave

Thanks guys, no more black smoke than usual.
Blows out only on acceleration.
I can't see any reason any reason for it will try with the aircleaner out.
Thanks will check in when I can.
Cheers.

Ewart,
might be stuck boost pin in Injector Pump or possible leak/restriction in the boost line from the manifold to the pump.
this would limit performance without extra smoke and reduce boost but I doubt it would increase EGT

see section in attached .pdf under heading Free Up Injector Pump Fuel Pin

also video on freeing up stuck pin here

Delayed ignition (spark), or delayed fuel delivery in a diesel would result in less energy recovered into the crankshaft.

While ^this theory^ seems reasonable, I do not know how the injection could get delayed....


(It seems more reasonable than the OKA's sympathy for international climate day)

Hi Ewart,
Yesterday I rang the bloke that did the work on your truck in Perth a few weeks ago and only gave him your description of problem his answer without hesitation was loosing air from turbo to engine... you have a leak which will only show up on boost, the fact that you can still get 6psi means you will have to check every joint and pipe including intercooler.
his second answer was a restriction from snorkle to turbo... I had a incedent where I was in the bush and lost power and finally found that I had sucked the leaves right off the trees and 1/2 filled the filter and filled the snorlle.
He said that with the description it is not the I.P.
Martyn

mort wrote: He said that with the description it is not the I.P.

agree, IP problem is unlikely to increase turbo temp

Thanks everyone, I will keep heading south while I can and if I haven't found the problem by the time I get to somewhere where I can do some thorough investigation and find the cause.

Cheers

My throttle has been headed towards the floor.
And the whistling turbo whistles no longer.
And power is down.

Ewart - is that turbo whistling, and then whistling at a higher pitch (more RPM)

One thing to check on all Oka's before getting carried away is to make sure you are actually getting full throttle at the pump when the accelerator is on the floor. Quite often the actual pedal is bent so that it is on the floor before the full travel is realised.
The other problem is that often the actual cable is not adjusted at the IP end to actually give full throttle when the pedal is on the floor.
This is totally separate to Ewart's higher EGT and down on power issues.

No I can't hear any thing different.

Thanks to every one, fault finally found.
It was a loose clamp on the intercooler.
Every clamp on the intercooler could be nipped up half to one full turn after 10 years.
Thanks for your input.
Cheers