Vehicle & Technical > Discovery
Knocking noise
Evilgoat:
200TDI I/m planning to strip and rebuild has lost a bearing liner :) Previous owner found it when taking the sump off.
A Stethoscope can be handy, falingin that you can improvive using a large screwdriver or rod with a flat plate on the end. Press the chosen item against areas of the engine, you will eventually find the place where it is loudest.
As mentioned though it sounds like its going to be a big end bearing or crank bearing. Does the knocking change under load?
craigiow:
yeah speeds up with the engine, almost seems quieter under load.
will try the stethoscope idea at weekend
Evilgoat:
One of the crank bearings :(
Running under load, there are no forces acting to oppose the throw of the cranck and it 'flaps about' as Guardian said, the knocks will co-inside with BDC on the pisteons closest to the missing/bust/dead/worn bearing.
Under load eventually the engine will be workign against enough tourque to force it to comply with the shape of the bad bearing and it'll ease up.
It will get worse, probobly quite quickly :( Sure someone else will be here in a sec to tell you how to do the bearings. It is worth visually confirming it though, you should also be able to check for endfloat on the front pully too, which may give a clue.
thebfg2003:
Had a similar loud knocking noise on my 300tdi. Was expecting a major problem. :shock: Took it to garage mate....turned out to be a bent pushrod and snapped adjuster. £120 all in. :D Runs and sounds great now. Well chuffed
Kev
craigiow:
got it booked in to a garage later today to try and diagnose it ,fingers crossed nothing to major
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