Quote:
Originally Posted by m5james
Ehh, I fear the damage is already done by the way he explained how the engine sounded. As long as he can make doubly sure the timing hasn't jumped, he might have a chance to save this engine. It's really too soon to tell at this point if it'd even be worth the effort of trying to backflush.
|
Hi m5james,
My X5, 2001, 4.4 has done the same at 270k.
I got the front of the engine apart and discovered that the plastic lining on the entire V deflection rail is gone and there is a substantial slack on the chain. The camshafts location @ the 1cyl. TDC seem to be slightly off and the chain was kinda clicking and skipping when I was aligning the TDC rotating the vibration damper pulley by hand.
I was not far away from home when the car started this "ticking" noise and I parked it on my driveway and haven't driven it after. The codes were cam shaft VANOS control cyl. 1-4 and knock sensor cyl. 1-2. I have replaced both sensors and tried to start the vehicle couple times - it started no problem, although the sound of the cold engine was accompanied by a loud clanking rattle that would disappear @ about 1500-2000 rpm (of idle run). I did not hear any other unusual sounds. The rattle by itself was quite unusual and I shut down the car and haven't started it since.
With 270K on the engine I will go to full extend and replace both timing adjustment units, their solenoids,timing chain, all guides, and all the tensioners and the distributor piece with the total cost of parts approaching $2,500 ...if only the engine is repairable.
You guys have probably seen these cases a lot and may give a good advise. What would be the safest way of approaching the repair? Is it possible to check the engine somehow to make sure it is repairable before investing an all the parts? I have purchased the timing adjustment tool and it is coming tomorrow.
I appreciate your help and expertise a lot.
Thank you.