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From: George Orwell on 8 Aug 2010 08:33 I have a VL Commodore. The engine has been rattling like a bucket of bolts. The local workshop said do not go far, it is gunna blow up. My neighbour said put 30W70 oil in, she'll be right mate. It was due for a lube, so I tried that. And it did become quieter, but not until I drove it for half an hour. I understand that if the shafts are worn then a thicker oil might help, but I am perplexed by the delayed reaction. It is almost as if the oil has healed something. (That was 3 weeks ago, and still no conrods smashed their way out yet). Il mittente di questo messaggio|The sender address of this non corrisponde ad un utente |message is not related to a real reale ma all'indirizzo fittizio|person but to a fake address of an di un sistema anonimizzatore |anonymous system Per maggiori informazioni |For more info https://www.mixmaster.it
From: who where on 8 Aug 2010 10:38 On Sun, 8 Aug 2010 14:33:22 +0200 (CEST), George Orwell <nobody(a)mixmaster.it> wrote: >I have a VL Commodore. The engine has been rattling like >a bucket of bolts. The local workshop said do not go far, >it is gunna blow up. My neighbour said put 30W70 oil in, >she'll be right mate. It was due for a lube, so I >tried that. And it did become quieter, but not until I >drove it for half an hour. I understand that if the shafts >are worn then a thicker oil might help, but I am perplexed >by the delayed reaction. It is almost as if the oil has >healed something. >(That was 3 weeks ago, and still no conrods smashed their >way out yet). Depends a LOT on the history of the motor aka why it is rattling. Is it lifter noise, bearing noise, ...? Is the oil pump shagged? Is the oil filter blocked? When was the last decent oil/filter change (before you added treacle)? If the history isn't a pretty picture (or is unknown, same outcome) the motor is probably full of sludge and varnish. Those units neede good regular changes to keep them percolating. In extreme cases the shite in the sump will block the oil pickup screen, and that DOES cause a real B-O-B sound.
From: Jason James on 8 Aug 2010 18:26 "George Orwell" <nobody(a)mixmaster.it> wrote in message news:35bb8f38cab46b777d45b170916623ba(a)mixmaster.it... >I have a VL Commodore. The engine has been rattling like > a bucket of bolts. The local workshop said do not go far, > it is gunna blow up. My neighbour said put 30W70 oil in, > she'll be right mate. It was due for a lube, so I > tried that. And it did become quieter, but not until I > drove it for half an hour. I understand that if the shafts > are worn then a thicker oil might help, but I am perplexed > by the delayed reaction. It is almost as if the oil has > healed something. > (That was 3 weeks ago, and still no conrods smashed their > way out yet). Yeah that is opposite to what a worn motor is like. Initialy the bearing clearances are closer when the engine is cold. As it heats up, the running clearances increase and oil-pressure drops. Assuming it uses hydaulic lash control>> It maybe that what you hear, is hydraulic lash-adjusters noise, and once the engine heats up they get more oil to maintain correct leak-down rate?? The test for determinng whether a noise is due to bearings or pistons, is to load the engine by placing it in gear with the handbrake on, and giving it a little throttle,..if the noise gets louder, its bearings/pistons,..if not its some other source eg cam-drive, lifters etc Jason
From: Jordan on 8 Aug 2010 19:22 Check also the harmonic balancer - the crankshaft pulley for the serpentine belt is a wearing part. The bonded rubber vibration damper becomes unbonded. You can see if it has let go, in the form of a crack all around it. I replaced my wife's loudly-knocking one on her VS two weeks ago. Gee, I never thought I'd be posting car hints here. Jordan
From: Lars Chance on 8 Aug 2010 21:29
George Orwell wrote: > I have a VL Commodore. The engine has been rattling like > a bucket of bolts. The local workshop said do not go far, > it is gunna blow up. My neighbour said put 30W70 oil in, > she'll be right mate. It was due for a lube, so I > tried that. And it did become quieter, but not until I > drove it for half an hour. I understand that if the shafts > are worn then a thicker oil might help, but I am perplexed > by the delayed reaction. It is almost as if the oil has > healed something. > (That was 3 weeks ago, and still no conrods smashed their > way out yet). > Is that the Datsun engine? It's probably just the cam-chain that was rattling and the hydraulic cam-chain tensioner that has responded to the thicker oil. -- Elsie. |