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The injector o-rings and washers were changed today, initially with no exhaust smoke but with a little hiccup shortly after traced to an injector o-ring not in the correct groove which quickly raised the sump oil level by about 6 inches causing uncontrolled engine run-on. An oil and filter change will be done next w/e hoping for a better result.
How did you stop the engine Graeme? , manual box?Quote:
Originally Posted by Graeme
FWIW, you will feel when the "o" rings seat properly assuming genuine "o" rings
I squeezed the intake hose with multi-grips. I grabbed a screw-driver and multi-grips but left the knife in the toolbox, hoping not to destroy the hose. The owner was very concerned at not being able to stop the revving but I was travelling close behind so very quickly shut it down.
I had noted at the time that the injector basically slipped into place rather than needing a bump with the large screwdriver that I used on the other 4. I must have been distracted to not finish seating the o-ring as there's no other explanation. That the fuel system took a very long time to prime then the engine took a very long time to start was probably due to the pump not being able to build enough pressure. The leaking injector was easily spotted when the ignition was switched on with the cover removed as fuel was spraying from around the injector.
I made my TDV8 close its EGR butterfly for 15 seconds when the ignition is switched off in case of engine runaway. I had also fitted a similar system to my TD5 D2 to close its EGR butterfly.
Well done, that was some quick thinking. Hopefully just that seal will sort the problem. It sounds like it filled up pretty quickly.
They do take a long time to purge, get the fuel through and start. Far longer than expected.
As I said to the owner after the first start-up, the change of seals needs to be proven to have solved the problem which will still need to be proven after the oil change. However there was no carbon around the original washer on co-incidentally this same injector, unlike the other injectors, possibly suggesting that it had been flushed with fuel although the other 4 washers showed signs of uneven sealing. All the injector clamp bolts were relatively loose requiring minimal effort to release whereas the bolts on the rocker arm were very tight yet they're all meant to be tightened to the same torque. My impact wrench couldn't release the rocker arm bolts.
Thats a worry also when the HT bolts are going into aluminium. Interestingly, my persistent seal leaking also involved a cracked piston.Quote:
Originally Posted by Graeme
Wow that was quick thinking, the only other runaway I've heard of being stopped was by a guy taking off his jacket and stuffing it in the air intake. I've also heard the theory of squirting a co2 fire extinguisher in the air intake IIRC, as no oxygen equals no run.Quote:
Originally Posted by Graeme
After having drained about 22L from the sump then filled with new oil and spin-on filter and the I/C R&R'd to drain around half a litre, the exhaust smoked for about the 1st 10km at 100 kph then no more smoke and the engine pulls and idles as it should. The owner is chuffed!
Thanks to those who suggested possible/probable causes of the original problems.