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Old 10-31-2005, 08:01   #1 (permalink)
Joe
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Sticking valve?

I have a 1972 Ford Mustang, 351 C, 4V. It has the open chambers and
hydraulic lifters. Never had a valve job, so cam and valves are
original. Only has 32,000 miles. When running, there is a "ticking"
noise coming from the number 8 cylinder. Sounds like its valve
related, and my first thought was incorrect lifter lash adjustment.
But, because they are hydraulic lifters, there is nothing to adjust.
Vacuum is at a very steady 16.5 inches at idle, and there is no
flucuation in the vacuum to indicate a sticking valve. Any suggestions
as to what this could be?

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Old 10-31-2005, 14:01   #2 (permalink)
Wound Up
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Re: Sticking valve?

Collapsed lifter?

--
Wound Up
ThunderSnake #65

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Old 10-31-2005, 14:01   #3 (permalink)
Kevin Bottorff
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Re: Sticking valve?

"Wound Up" <jello72@iwon.com> wrote in news:1130794031.041124.281170
@o13g2000cwo.googlegroups.com:

> Collapsed lifter?
>
> --
> Wound Up
> ThunderSnake #65
>
>


or even with the low miles it isn`t impossible that a valve guide is not
worn loose already. the varnished up lifter would be my first check
though. A good eng internal cleaning with the product of your choice should
be the first thing to try. KB

--
ThunderSnake #9 Warn once, shoot twice
460 in the pkup, 460 on the stand for another pkup
and one in the shed for a fun project to yet be decided on
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Old 10-31-2005, 15:01   #4 (permalink)
keller428@hotmail.com
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Re: Sticking valve?


Possibly a sticky or collapsed lifter. A bent pushrod (or one that's a
little short) also comes to mind as a possibility. A worn rocker or
rocker fulcrum will also cause problems like this.

If the motor is sitting there running like a watch other than the
light ticking, I'd put some Rislone in it to help loosen up any
deposits and drive it around a little....like slowly around the block.
Then swap in some fresh oil (5W-30 Mobil 1 synthetic seems to clean up
old deposits very well for me) and drive it briskly (don't beat the
snot out of it at valve float but don't drive it like grandma does
either) and drive it often as possible. Swap the oil out at short
intervals (500-1000 miles) for a few thousand miles and see if that
quiets things down. It'll either get better with time (a sticky lifter)
or stay the same (or get worse) which could be a slightly collapsed
lifter or bent pushrod.......if there is no noticable Fthud, Fthud,
Fthup coming from the exhaust or back through the carb and the vacuum
gauge is rock steady at idle then its unlikely that the problem is a
bent or stuck valve, collasped lifter, or bent pushrod and may just be
a little too much valvetrain clearance and or a sticky lifter.

If it doesn't improve with good oil and drive time then it may have to
come apart to be inspected. If it gets any worse that a light tapping
and/or if the vaccum gauge starts dancing with the tick or if you start
getting a characteristic 'fhtup' out of one end or the other them stop
the motor and pull it down for inspection.

-Mike.

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Old 10-31-2005, 17:01   #5 (permalink)
Big Al
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Re: Sticking valve?


"Wound Up" <jello72@iwon.com> wrote in message
news:1130794031.041124.281170@o13g2000cwo.googlegroups.com...
> Collapsed lifter?
>
> --
> Wound Up
> ThunderSnake #65
>


Easy test. Remove the valve cover, find the noisy valve. Put a folded up
shop towel in the palm of your hand and press hard on the pushrod end of the
rocker. The play and noise should increase, then release the rocker. The
noise should go away fairly quick.

Al # 35


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Old 10-31-2005, 19:01   #6 (permalink)
Wound Up
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Re: Sticking valve?

Big Al wrote:
> "Wound Up" <jello72@iwon.com> wrote in message
> news:1130794031.041124.281170@o13g2000cwo.googlegroups.com...
>
>>Collapsed lifter?
>>
>>--
>>Wound Up
>>ThunderSnake #65
>>

>
>
> Easy test. Remove the valve cover, find the noisy valve. Put a folded up
> shop towel in the palm of your hand and press hard on the pushrod end of the
> rocker. The play and noise should increase, then release the rocker. The
> noise should go away fairly quick.
>
> Al # 35


Al, you always do have the neat little diagnostic tricks. True
gearheads always do. My neighbor will ask me, "did you"... etc.

I need to expand my repertoire, especially with electrical stuff. And
there was one about fan clutches a while back I need to Google out...


--
Wound Up
ThunderSnake #65

AHPBBFM posting rules: http://tinyurl.com/ak694

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Old 11-01-2005, 10:01   #7 (permalink)
Big Al
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Re: Sticking valve?


"Wound Up" <none@your.disposal.ask.me> wrote in message
news:4366D102.5050002@your.disposal.ask.me...

>
> Al, you always do have the neat little diagnostic tricks. True gearheads
> always do. My neighbor will ask me, "did you"... etc.
>
> I need to expand my repertoire, especially with electrical stuff. And
> there was one about fan clutches a while back I need to Google out...
>
>
> --
> Wound Up
> ThunderSnake #65
>


You get that way after 45 plus years of screwing with this stuff:) Consider
myself the fan clutch guru. Experimented with them in the 60's. Had them
apart and have got them back together. Changed fluid in them, tried all
kinds of stuff with the thermostats trying to make them work differently.
Even made a test set up so I could run them on the bench with the blade on
at full speed. And, have never found a better set up for cooling a car.

Al # 35


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Old 11-01-2005, 19:01   #8 (permalink)
Wound Up
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Re: Sticking valve?

Big Al wrote:
> "Wound Up" <none@your.disposal.ask.me> wrote in message
> news:4366D102.5050002@your.disposal.ask.me...
>
>
>>Al, you always do have the neat little diagnostic tricks. True gearheads
>>always do. My neighbor will ask me, "did you"... etc.
>>
>>I need to expand my repertoire, especially with electrical stuff. And
>>there was one about fan clutches a while back I need to Google out...
>>
>>
>>--
>>Wound Up
>>ThunderSnake #65
>>

>
>
> You get that way after 45 plus years of screwing with this stuff:) Consider
> myself the fan clutch guru. Experimented with them in the 60's. Had them
> apart and have got them back together. Changed fluid in them, tried all
> kinds of stuff with the thermostats trying to make them work differently.
> Even made a test set up so I could run them on the bench with the blade on
> at full speed. And, have never found a better set up for cooling a car.
>


I've never heard of anyone doing anything to modify them. If you are
from that area, I imagine it would cross your mind. I still have to
test the one in the Mustang b/c of the "idles really hot with a/c"
problem. Three row, good pump, good flow, 6-blade fan -just- clears the
shroud. Damn if it doesn't frustrate me. Generic thermo clutch,
probably just old...

--
Wound Up
ThunderSnake #65

AHPBBFM posting rules: http://tinyurl.com/ak694

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Old 11-01-2005, 19:01   #9 (permalink)
Big Al
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Re: Sticking valve?


"Wound Up" <none@your.disposal.ask.me> wrote in message
news:436822F6.8030908@your.disposal.ask.me...

>
> I've never heard of anyone doing anything to modify them. If you are from
> that area, I imagine it would cross your mind. I still have to test the
> one in the Mustang b/c of the "idles really hot with a/c" problem. Three
> row, good pump, good flow, 6-blade fan -just- clears the shroud. Damn if
> it doesn't frustrate me. Generic thermo clutch, probably just old...
>
> --
> Wound Up


One question: When you first start the engine, does the fan roar? Any clutch
fan should.

Change the name of the thread and we can continue.

Al # 35



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Old 11-02-2005, 07:01   #10 (permalink)
Wound Up
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Fan clutches


Big Al wrote:
> "Wound Up" <none@your.disposal.ask.me> wrote in message
> news:436822F6.8030908@your.disposal.ask.me...
>
> >
> > I've never heard of anyone doing anything to modify them. If you are from
> > that area, I imagine it would cross your mind. I still have to test the
> > one in the Mustang b/c of the "idles really hot with a/c" problem. Three
> > row, good pump, good flow, 6-blade fan -just- clears the shroud. Damn if
> > it doesn't frustrate me. Generic thermo clutch, probably just old...
> >
> > --
> > Wound Up

>
> One question: When you first start the engine, does the fan roar? Any clutch
> fan should.
>
> Change the name of the thread and we can continue.


DUH (slap). You sparked the right memories; the mental tumblers lined
up. ALL other cars/trucks I've owned or driven regularly with
thermo-clutched fans did this. The Mustang does NOT. The other two
cars I currenly have are electrics, so I don't have a ready basis of
comparison. It will roar only when already very hot. If I -start it
hot-, it will, but never when starting it cold. I'm quite sure now
that it once did. I thought it sounded different somehow.

Time for a new one, you agree? Is there a brand you're particularly
fond of?

Thanks Al

PS - and Chaco Canyon looks simply awesome. When we visit, the wife
can stay at the pool if she wants; I'll commandeer a truck and go solo
if I have to.

--
Wound Up
ThunderSnake #65

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