On 6/12/2014 9:46 AM, Noddy wrote:
> On 06/12/14 7:47 AM, Jason James wrote:
>
>>> Lifters do not get pumped up by the "amount" of oil that "makes it into
>>> the lifter" It should always have oil in it and be full.
>>
>> Sure if they are low mileage. That initial start on higher mileage
>> donks demonstrates the empty lifter state :-)
>
> It does indeed.
It does not at all! Please explain, if you will, how the lifter could
possibly empty itself of oil. Even better, please explain how, in normal
circumstances, air could get INTO the lifter!
I know of only one or, possibly, two circumstances where this could
occur. The obvious one would be an air leak on the intake side of the
oil pump allowing air to enter the system. What that would cause is air
being pumped into the lifter along with the oil. The issue here though
is that would cause continuous lifter noise problems. They would not go
away after a second or two. The other is aeration of the oil, a very
rare circumstance. If the correct oil is used and is changed regularly,
this shouldn't be an issue. One possibility that could cause aeration of
the oil is crankcase windage. All sumps so affected have windage plates
so, again, this shouldn't be an issue.
All you are demonstrating is your distinct lack of knowledge of hydraulics.
>
>>>
http://tinyurl.com/oqf3qtb
>>>
>>> Note the diagram at the above URL...
>>>
>>> It shows the construction of a typical hydraulic lifter. Note the spring
>>> which pushes the plunger up to the top of its free travel to take up any
>>> clearance. Note that in normal operation, the plunger and associated
>>> socket will not be in contact with the circlip that retains it.
>>>
>>> Oil under pressure from the gallery can flow through the oil passage in
>>> to the annular space between the lifter body and the plunger. It can
>>> then pass through the "oiling hole" and enter the centre of the plunger.
>>> Note that the centre of the plunger is hollow and forms a reservoir
>>> of oil.
>>>
>>> The oil can then flow into the lower chamber through the check ball and
>>> spring. The check ball acts as a one way valve. Oil can enter through
>>> the check valve but cannot flow in the reverse direction. This is an
>>> important point.
>>
>> Tks,..this is greater detail on how I roughly knew their function...
>
> Too bad it's a load of crap :)
Would you like to refer to Chapter 2 of the publication, "A Collection
Of Nine Automotive Topics" published by the VACC. It covers the topic
quite well. Even you should be able to understand it! Well, OK, maybe
not! I have had to add a few points to clarify a few situations not as
well covered by the publication.
>
> *All* hydraulic lifters or lash adjusters bleed down, and it's part of
> their design spec. They need to meet a minimum "hold spec" in seconds to
> be considered fit for service, and just about every manufacturer has a
> procedure for testing them.
Not in dispute, part of normal operation.
>
> Typical allowable bleed down times range from 5 to 60 seconds, and it is
> advised that lifters or lash adjusters that *exceed* the maximum bleed
> down time are to be discarded.
Again, that point is not in dispute. You are trying to shift the issue
here...
>
>>> Another important point to note here is that you *always* have oil in
>>> the lifter even when the engine is not running. To open the valve, the
>>> oil in the lower section, being unable to exit through the closed check
>>> valve, will act as a "hydraulic lock" and lift the valve off its seat as
>>> the lifter rises up on the cam.
>>
>> Yes, but again, wear will see things like the valve not work perfectly.
>
> The valves are also *not* a permanent seal.
Assuming you mean the check valve in the lifter, was anybody saying they
were?
>
> They're designed to hold enough pressure to keep the lifter/lash
> adjuster energised while the oil pump is operating and nothing more. the
> fact that some hold pressure for much longer than this is an accident of
> their design. Not a deliberate part of the design itself.
You really don't understand hydraulics, do you? They are a ONE WAY
VALVE. They are designed to hold pressure during the time the VALVE is
held open and allow oil in when they are "off the cam". They are not
designed to hold long term oil pressure in the lower chamber. Why?
Because leak down will take care of any pressure remaining in there
causing a small loss of oil from the lower chamber to the upper chamber
(important point) and that's why you need the valve in there in the
first instance.
>
>>> As the cam starts to raise the lifter unit, the check ball, now
>>> reseated, traps oil in the lower chamber creating, in effect, a solid
>>> valve lifter which can then open the valve. The excessive valve
>>> clearance has now been taken up by the oil which entered the lower
>>> chamber. From this point on, the valve will run at zero lash.
>>
>> I think I follow this :-)
>
> *Please* don't listen to this fucking idiot, as he doesn't know his
> testicles from a set of Christmas tree baubles and is only confusing you.
On the contrary, my detailed explanation was to prevent confusion, not
cause it. Your vitriolic comments are adding nothing to the explanation.
We are awaiting your detailed explanation of hydraulic lifters to prove
YOUR case.
>
> This moron is a Google queen who, when he was last here as "Krypsis"
> claimed that he'd seen a sump explosion that blew the sump clean off an
> engine while leaving all the bolts intact.
>
> This is a guy who posted a picture of a Morris Marina with twin pot
> brake callipers with 5 stud rotors fitted and claimed that they all had
> them when if he's actually spent "years working on them" as he claimed
> he did he should have known that they most definitely did not.
No, that was a rodder retrofit. The 6 cylinder discs are thicker
versions of the 4 cylinder solid discs. I have oft stated I never worked
on the 6 cylinder Marinas. The were, at best, an abortion of a car and I
avoided them.
>
> This is the guy who reckons he taught "welding" in a non existent
> "welding shop" and who by his own admission has no formal welding
> qualifications other than the 5 minutes of instruction he received while
> allegedly working as a mechanic's apprentice.
Yep, taught welding for quite some time at both the Gleadell Street and
Cremorne Street Campuses. Even still got the letter from the HOD stating
that I could no longer teach in the welding shop due to hearing loss
issues detected after one of our regular hearing tests.
>
> The guy is an *idiot*, and a compulsive *liar* who will tell you
> whatever he wants to in order to satisfy his own egotistical need. He
If anyone here has "egotistical needs", it would be you!
> has absolutely *no* fucking idea what he's talking about, and listening
> to him will only lead you straight up the garden path.
An explanation of how lifters operate is going to put Jason up the
garden path? How so? You can't diagnose faults unless you full
understand the operation of the components. Anything else would be
guesswork at best.
>
>> Tks for going to the trouble to explain their operation and the
>> possible cause of the problem.
>
> I think you mean "thanks for the cut and paste job" :)
Er no.... the book I used as a reference is not available on the net in
any way, shape or form. I had to type my explanation out the hard way
and add segments where I felt the VACC explanation was a little lacking
in detail pursuant to the particular points I wished to make.
>
>> I'll prolly wait until the sole noisy one [after warm-up] gets worse,
>> then replace all of them.
>
> If you decide to do that, then either invest in a workshop manual or ask
> here for the proper initial bleed procedure that needs to be performed
> before they're run for the first time.
Easy to do if you have the testing tool. Not so easy without but still
possible.
>
> It's not difficult, but if you don't do it you'll fuck the engine.
Interesting... just exactly how will it damage the engine? They do self
bleed you know! The valves will still open, just a little less than
normal until the lifters bleed and will be a bit noisy until such time
as they bleed out. As always, a little lubrication at assembly will
cater for the short term need until such time that the oil pump
commences normalsupply
>
>> Theyve always been ínexpensive for American based cars IME, tho the
>> Canadian replacements have not been that quiet,..but quiet enough.
>
> In many cases people replace lifters looking to fix a noise caused be a
> worn cam lobe, and then blame the replacement lifters when they don't
> make a difference.
>
Yes Noddy. I would replace the camshaft as well since I would be putting
new lifters on worn cam lobes if I didn't. There would be a mismatch on
the mating surfaces even if the cam lobes themselves weren't worn out.
Note however that Jason's noise only occurs for a second or two on
startup, not continuously. Sort of rules out the camshaft. Still, at
200k+ km, and given Fords history of camshaft issues, I'd be inclined to
replace the camshaft and the lifters at the same time. That's of course
if I would even be bothered by a noisy lifter on startup.
--
Xeno.