Clunking noise

HI Everyone. This is my first post.

I have a ‘W’ reg 1.8 Frelander and it’s started to make a knocking-clunking noise which appears to be coming from the area where the prop shaft goes into the side of the engine. It doesn’t do it when the engine is idling but will do it when driving and the faster you go the quicker the noise gets. It will also do it if you are freewheeling out of gear with the engine switched off. Any ideas welcome.

if the noise is where you say it is most likely to be ird bearings.

freelance said:

if the noise is where you say it is most likely to be ird bearings.

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Hi – thanks. Is it worth/possible to replace the bearings in the ird or do I need to replace the whole unit?

Could be the CV joint at the IRD/propshaft interface.

Thanks guys.
Would I be correct in saying - if you disconnect the prop shaft and it still makes the clunking noise it’s NOT the ird that’s at fault?

No you would not be correct. An internal fault in the front section of the IRD would still make a noise. Damage to the bevel gears may not make a noise depending upon its degree. A clunking noise suggests it may be the hypoid gear as this is the one which usually suffers distress due to VCU seizure.

The diagnosis is there is a tooth off the Crown Wheel and Pinion. Is this easy to change or is it not worth doing. Should I replace the IRD?

best to replace crownwheel and pinion if you intend to keep a long time.