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Re: Top end knocking noise
Try doing a compression test to see if all cylinders have same reading. If compression is low on 1 cyl, that is obviously where to start. Check the valve clearances to that cylinder. If valves not set too tight, then it must be piston related.
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Knocking is pretty non descript as there are a lot of noises that are associated with an engine. A true knock is a very bad sign. However there are other noises that can be confused for knocking. One way to tell is the location of the knock. High or low on the engine. If it is high then it is not as serious and is usually associated with the valve train. Low knocking is the crank and pistons. Ticking sounds are more common and can be something as simple as wear on lifters etc.
have the timing checked if its off it could be pre-ignition which some people describe as a knock. if its a heavy knocking noise it could be a piston noise or it may even be a bad crankshaft/connecting rod/bearing. have the oil pressure checked this may help to know what to do. some people describe a rocker noise as a knock but its more like a ticking noise at the top end in the area of the valve covers.
might be the valves have been damaged running without oil
- or the crankshaft / camshaft / main bearings
most probably you have to let the engine be rebuilt by a mechanic
(expect cost of more than US$ 2.000)
or get another (used) engine at a scrapyard
In some oil filters they have anti drain back valves in them, what keeps oil in the filter when sitting for a long time. this helps get oil to ur top end quicker. If not i takes longer to get oil to ur rocker arms so you might hear a knocking or ticking for a while. Try when u do ur next oil change to get a filter it a anti drain back valve and that should help make that noise go away quicker.
the chances are you have done the shell bearings on the cranck shat in or the big ends if it is a loud knocking noise or possibly the turbo (is their any smoke from engine bluey in colour if this is so engine has been damaged it could also be the camshaft too without hearing it it could be anything )hope i have helped you
I use 6 to 6.5 litres in my 2800 (non-turbo) engine. Six litres is safe.
The loud noise: Careful please. I have had a big-end (the bottom of a connecting rod) come off while driving - Of course you loose one cyllinder's power and the noise is very bad. Also damages the crank shaft. If the noise does not go away by adjusting the oil level, have the engine checked immediately.