Alfa romeo 156 2.4 JTDm 20V Tapping - Alfa Romeo Forum
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Alfa romeo 156 2.4 JTDm 20V Tapping

Just recently picked up a 156 with the rather nippy 2.4 JTDm 20V lump in it, it was last serviced nearly a year ago and its showing service due within the next 1200~ miles.

Started noticing a tapping / ticking noise - I usually associate this on a diesel with aging injectors under load (or just any amount of throttle) however I'm not sure that it is an injector as it does it even off throttle and it follows the engine RPM.

Its not entirely consistent as first time I started it today it didn't do it initially then later idling it start ticking again. I removed the engine cover and managed to pin point the tapping from the rocker cover Looks like its on cylinder #1 so it's now a case of working out what it can be next.

Any other diagnostic ideas I can use? Do tappets need adjusting?

I think giving it a damn good service may help a bit.

Edit - Managed to get a video of it -
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i cant hear anything unusual there - sounds ok to me - but then i wouldnt really know i suppose
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The Tappets are hydraulic.
You might have a noisy injector, try using a bit of 2 stroke oil in with the fuel, my car ticks a bit but with the 2 stroke in the fuel its lovely and quiet

About 250ml in with 40 of fuel
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