Dave I love reading your posts..make me happier n happier I got the 300TDI;)
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Dave I love reading your posts..make me happier n happier I got the 300TDI;)
Evening Guys,
Thanks for your replies. I have just been to the engineering shop and seen all the pressure tests. Very happy as all oil and fuel gallies are fine............:D
However, now it seems the injectors are suffering from 'blow-by'.....has anybody heard of this before? If so can anybody fix this as the injectors cost a small fortune (about 800.00 A$ PER injector and 3 of the 5 are definately leaking, so might as well change all 5........:(
Can anybody recommend a cheap supplier in Oz, UK or US?
Thanks, and looking forward to your feedback
Auke
ummm blow by how..... how was the fuel pressure check done?
Its possable to have the pressures in the fuel system come up ok and get the fuel coming past the seals.
Theres 3 types of blow by....
1. blowby past poorly sealing piston rings (which is irrelvent in this case
2. blowby past the injector up into the head as the main seals are stuffed, if you had this youd get hot areated fuel coming into the tank and youd be having herrendous running problems.
3. blowby into the injector. this is where the combustion gasses enter the nozzle of the injector itself and come up through the guts of the injector ruining it in realtively short order. A usual clue is the injection spray pattern is a set of needle jets instead of a mist with the injector opening at too low a pressure and dribbling like a 90yo ogling a penthouse.
in theory the only one that can have an appreciable effect on rising oil levels is #2 as the fuel is getting sudden pressure spikes that is forcing it past the seals in the head. Hypothetically if that were the case you would see burning past the seal lip for the primary seal on the injector if the injector bodies are clean and the seats are ok refit new seals and see whas what. (id also expect your fuel pressure regulator to be herniating itself by now)
If the guts of the injector are totally stuffed (it'll still inject okish tho) then the pressure spike might be coming back through the injector itself. While a unit injector Can be rebuilt its normally cheaper to buy a new unit and let them keep the old one for reco. The injectors in a td5 havce a fuel code stamped on them and that needs to be entered into the ECU for optimal preformance.
blowby into the injector itself would leave you running rough and smokey although the emcon on the td5 is pretty good and will mask a multitude of sins.
Auke,Quote:
Originally Posted by Aukedrdw
I have just done the same job on a Td5 today, all the lower injector washers were incorrect and some even had swarf jammed under them, and all but 1 injector O ring was non genuine and incorrect thickness. Needless to say this vehicle had excess oil in the sump, about 2 litres apparently! This, coupled with the complete destruction of the turbocharger bearings and impellers, has caused a fair bit of a headache for the owner. The vehicle was recently purchased from NSW privately, and had just had the head off due to a blown head gasket apparently. Not happy Jan. Why do we end up with all the rubbish down here??????:mad:
Injector problem fixed, turbo ordered. Oil changed.Fingers crossed:eek:
JC
Mate just by the by did you pull the supm and eyeball the bottom half of the mains and the bigends?Quote:
Originally Posted by justinc
(pm if you want to hear about an interesting story relating about this and an isuzu truck run by a bodgies bro company, I dont want to hijack this one)
Funny thing though, I was at the engineernig shop and saw the diesel oozing (very slowly) out of the top of the injectors (where the springs are) when the fuel lines were pressured at only about 6 bar.
Graeham Cooper has seen fuel pressure drop too apparently , and was sure that this was NOT down to the washers or seals, but could not see where the pressure was leaking to do to all the oil being every where. That is why he thought the head was cracked - normal for a TD5 apparently.....:eek:
I do believe that there is no other explanation left other than the .... the 'blow-by' theory, although a cheaper problem to fix would be welcome at this point.
Where can I get a set of injectors for 'normal' money?
Hi Dave,Quote:
Originally Posted by Blknight.aus
Not yet, I had run it for a while today and has excellent oil pressure and is quiet in the bottom end. (This was BEFORE I took it for a 100metre drive out the workshop door and stopped when I heard the turbo groaning!!!) Owner is in shock and needs vehicle to use for work, Self employed.(Why does this happen to all the nice people?:mad:)
If the bottom end is no go I would've expected to hear some pretty foul noises and had an oil pressure issue I would think. Also, apart from the usual early Td5 cam lobe wear, there is very little indication in the top end that suggests more damage. I'm being optomistic here too....I agree the crank and bearings are worth a look, but either way even if he needs another mtr soon, the turbo will be required. At this point, $$$ are tight for this guy, and a good secondhand turbo, new injector seals and washers, and a few hours labour and oil will keep him going for a bit so he can go back to work.
JC ( Feel free to send me PM...)
Hi Auke,
Did you end up getting this resolved? If so, what was the issue and cost? I have the same problem. Whilst not properly noting the oil level, I am sure it has risen. I have sent my oil off for analysis and should have the results back by tomorrow.
Cheers
Caine
A trick I saw in a farming mag was to put a drop of oil from your sump on a pane of glass and next to it a drop of new oil ( same as what is in the sump ) and hold the glass vertical. If there is crankcase oil dilution with diesel then the drop of sump oil will run down the glass faster and further than the new oil.
That's nothing, mine had 4 litres (of diesel) in there when the head went! :eek:Quote:
Originally Posted by justinc