Guys, 60km after the injector pump was replaced with a reco unit the engine has developed a serious knock.
Only just happened after going over a speedbump. Engine has been really low on power since pump refit. Been hard to start when warm since new pump and also has an uneven vibration about it around 1500rpm (used to be smooth as a silk diesel could be). Knock goes away when you let the engine revs drop with no throttle but are loud as ever when pressing the throttle.. so i think its fuel related!
Oil pressure is still showing nice and healthy on the factory gauge.. Oil pressure should drop with a bottom end failure of this sort of noise (had it happen before on a petrol)
Update: is blowing smoke which appears to be brownish/white and smells heavily of diesel.
SO
I assume the most obvious way to adjust the timing pump is to rotate the body physically. I don't have any gauges so I'm going to have to do this by feel. Which way should I be turning it? Should I even attempt to do this?
Cheers for any help guys
update in cliffnotes
Ok so the mechanic who installed the injector pump arranged the vehicle to be towed from my place to a reputable diesel place for them to TROUBLESHOOT the issue. I call the diesel place to ensure they are just doing a troubleshoot on my vehicle - NOT a repair - this was around 10:30am.
I get a call from my mechanic around 12:30pm from my mechanic and he tells me they've got it running again but I have a $600 bill to contend with. They have fitted reco injectors to it. I am speechless as I had not authorised this - my mechanic states neither has he. My mechanic tells me that they have done this to him before but it didnt involve as much money.
Said diesel place is now closed for christmas holidays, so cant get in contact with them.
Get to mechanic's workshop. Tells me he has had to have a fiddle with the timing to try and get it right still. I didnt feel it at the time but it still takes a while to kick over and get going regardless of glow plugs. Starts after a few revolutions after pressing accelerator down fully - it used to start pretty much as soon as the glowplugs went out and you flicked the key to start.
It still runs slightly rough and doesn't have the same power it had before the reco pump was installed.
So in 2 days ive spent nearly $1600 on it and I'm not confident in its reliability and how it runs. I am not unhappy with my mechanic's efforts as I realise he is not a diesel expert - I always knew I would have to get it timed/fueled properly by a good diesel workshop in due time.
Why do i not believe it was an injector problem - before all this it ran sweet. Great power great fuel economy BUT then the pump started leaking. Only blew visible smoke over 2800rpm and going up big long hills. There were no signs the injectors were on their last legs. Plus I drove just under 70km after the reco pump was fitted without a problem (other than it being slow and hard to start). I had organised for this morning the reputable diesel place to adjust timing and fueling for me but unfortunately it rocked up on a towtruck after it started blowing mass loads of smoke and knocking severely AFTER going over a speedbump.
Am I overreacting? Or should I feel rightly pissed off about them authorising this work.
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TD42 knocking - suspect injector pump timing has slipped???
TD42 knocking - suspect injector pump timing has slipped???
Last edited by Yom on Fri Dec 21, 2007 7:14 pm, edited 3 times in total.
Having had exactly this problem you mention after replacing an injection pump:
Its very easy to get grit/dirt into the injectors during the pump change, as you have to remove all the injection pump pipes and fittings. A sticking injector gives exactly the noise you describe--very loud knocking noise which sounds like a big-end bearing.
When installing a new pump, marks on the pump and mount are provided to get the timing close, but not optimal. Unless care is taken, its very hard to get the timing correct due to the timing mark on the crank pulley being difficult to see from above. To do the timing properly, a dial gauge that measures plunger lift at TDC is required-- and ideally, you should take off the rocker cover and measure valve rocker lift to determine TDC. But its worth while making sure the mark on the pump flange is aligned with that on the back of the timing case cover. This should get pump timing close enough for the engine to run ok.
When i replaced my pump, my timing marks were slightly out of alignment at the optimum pump advance. Usually you get a very rattly engine with timing too advanced--too retarded and gives hard starting when cold and smoke.
Nick
Its very easy to get grit/dirt into the injectors during the pump change, as you have to remove all the injection pump pipes and fittings. A sticking injector gives exactly the noise you describe--very loud knocking noise which sounds like a big-end bearing.
When installing a new pump, marks on the pump and mount are provided to get the timing close, but not optimal. Unless care is taken, its very hard to get the timing correct due to the timing mark on the crank pulley being difficult to see from above. To do the timing properly, a dial gauge that measures plunger lift at TDC is required-- and ideally, you should take off the rocker cover and measure valve rocker lift to determine TDC. But its worth while making sure the mark on the pump flange is aligned with that on the back of the timing case cover. This should get pump timing close enough for the engine to run ok.
When i replaced my pump, my timing marks were slightly out of alignment at the optimum pump advance. Usually you get a very rattly engine with timing too advanced--too retarded and gives hard starting when cold and smoke.
Nick
Its a GQ.
Its hard to start warm and hot (cold starts now seem good). Well not hard to start, just turns over 5 or 6 times to start - it used to start as soon as you flicked the key.
It blows no smoke on startup.
It blows absolutely stuff all smoke. Even when giving it shit up a hill and with high revs, stuff all smoke I am told from a mate following behind me.
I reckon its not getting enough fuel and the timing is still out.
(Oh today I changed the fuel filter and air filter - fuel filter was a bit sick but doing its job, looks like biodiesel has been through it which probably caused the original injector pump to shit its seals).
Its hard to start warm and hot (cold starts now seem good). Well not hard to start, just turns over 5 or 6 times to start - it used to start as soon as you flicked the key.
It blows no smoke on startup.
It blows absolutely stuff all smoke. Even when giving it shit up a hill and with high revs, stuff all smoke I am told from a mate following behind me.
I reckon its not getting enough fuel and the timing is still out.
(Oh today I changed the fuel filter and air filter - fuel filter was a bit sick but doing its job, looks like biodiesel has been through it which probably caused the original injector pump to shit its seals).
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