From: George Orwell on
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).


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From: who where on
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

"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
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
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.
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