heavy oil to soothe clapped out motor???

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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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

 

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.

 

Harmonic balancer noises don't go away, they just get worse.

 

That is true though not having a serpentine belt doesn't exclude it from
having a balancer.

 

VL has a belt, not chain.

 

Bullshit - I've definitely experienced one where the noises went away
completely.


Literally decades ago, the old man bought a CL valiant for my mum. He
wouldn't let me go and look at it (he was an odd fellow and was too
inscure that I might pick faults he missed, so he'd get the thing, then
I'd be the poor **** who had to fix it, and I'd be a **** too, if I
mentioned the fact that it was a lemon'

anyhoo, we know when he's arrived back with it, because it is making a
sound that is like piston slap from something this size:

http://people.bath.ac.uk/ccsshb/12cyl/index.html.o

(for the nit pickers, due to the connecting rod and piston rod assembly,
this engine wouldn't technically develop piston slap as such, but the
point is it was noisy, fucking noisy).

Anyhoo, we traced the noise to the balancer. And unlike most where the
outer hub was fucked, this one wasn't (well not completely) - somehow
the inner hub was no longer an interference fit, and it rocked/vibrated
around. It still ran and seemed like it would't go astray).

I had more pressing issues - the front wheel bearings. They were in
need of 'adjustment' - and after removing a grease cap, it turned out
they were bone dry inside, save for a light smear of grease on the
rollers. How the **** he even got it home without them seizing is a
mysetery to me. When confronted with how fucked the car was I was abused
for being an arsehole (mind you he bought a new car for himself and mum
couldn't drive it)

Anyhoo, the noise was so loud that at a fast food drivethrough, they
politely asked if we could turn the motor off because htey couldn't hear
the order coming through.

About a week later, whilst I was still scrambing to sort other issues on
it, the noise (which only occured at idle, for whatever usual reasons)
went away. No protest, no loud noises, just stopped. Then I looked at
the amp meter......

The balancer had come right off, hub and all, and flung itself up and
over and was resting, nore or less, above a chassis rail on the inner
guard!

What actually looked cool was the crankshaft snout, due to the balancer
rocking its way off over time, it had left a patter that was kinda a
conbination of a kaleidoscope and some of the dodgy visualisations on
various mp3/audio players.



Clearly given the tangents in this post, I'm bored big time, lest I'd
have beter things to do with the time it took to type up

--
John McKenzie



admin@loopback
$LOGIN@localhost I knew Sanchez before they were dirty
$USER@$HOST $LOGNAME@localhost -h1024@localhost

$USER@localhost

 

Entertaining post nonetheless ;-)

 

Its not uncommon to see a HB installation bolt/washer left on to hold the HB
from coming off (again). My CM used to make a "tink tink " sound. It was the
oil-slinger vibrating back and forth on the shaft-key because the HB had
started to come off.

Jason