Cherokee-LTD

"William Oliveri" <wuji@bigvalley.net> wrote in message
news:buk0rk$j840q$1@ID-193866.news.uni-berlin.de...
: Thanks Steve, Cherokee, and all for the great information and tips.
:
: One curious question. You mentioned not mixing things up due to wear (I'm
: afraid I've taken off the stuff from one cylinder (rockers, rocker bridge)
: and have not noted which are which. Hopefully I'll be alright with this
: one. I'll pay attention with the rest).
:
*******Don't lose any sleep... chances are better than good that you will be
fine provided that each component shows normal wear. Do a close
inspection... if you see ANY cracking or dull surfaces, chances are the
mated surface will show the same. Change these parts. Valvetrains are very
forgiving due to hydraulic lifters but if you mix up the parts you're asking
the metal to re-conform in a very short period of time.... that's when you
will run into trouble (tick,tick,tick)

: So when you replace new parts you need to replace every component in the
: valve assembly? How does this work?
********Not necessarily. When you replace a cam, always replace the lifters.
When you do a valve job, replace the seals and springs. If you have to
replace a rocker, replace the pushrod.

-Brian

:
:
: I have a couple of references:
:
: This is from a 72 I6. I have an 83 I6 4.2 but I think it looks close.
: http://members.bigvalley.net/wuji/jeep/valve.jpg
:
:
: There's some great animations at this site:
:
: http://auto.howstuffworks.com/camshaft1.htm
: http://auto.howstuffworks.com/camshaft2.htm
:
: Thanks,
:
: Bill
:
:
:
: "Cherokee-LTD" <spammenot@home.com> wrote in message
: news:OffPb.62637$nl2.29662@news01.bloor.is.net.cab le.rogers.com...
: > Bill,
: > He's talking about the rocker which converts the upward motion of the
: > pushrod to the downward motion on the valve. Not sure about your engine
: but
: > the rocker usually pivots on a cup and secured but a bolt or it's on a
rod
: > that spans the head and retains all the rockers. The pushrod can be
: removed
: > when the rocker is out of the way simply by lifting it out of the hole.
: > While its out, roll it across a flat surface to check for bends and make
: > sure it's clean inside... when re-installing, make sure it's seated
nicely
: > in the lifter and at the rocker.
: > Typical valvetrain assembly:
: > Camshaft: elliptical lobes rotate converting rotary motion to
: reciprocating
: > motion
: > Lifter: rides on the lobe, lifts and lowers as the cam turns
: > Pushrod: Bridges the gap between the lifter and the rocker
: > Rocker Arm: Converts the upward motion of the pushrod to the downward
: motion
: > on the valve
: > Valve: I'm sure everyone has this figured out
: > TIP: When dis-assembling valvetrain components, always keep them
: > organized... #1 cyl (intake) with all its components...#1 cyl (exhaust)
: and
: > all it's components etc. Valvetrain components have so many wear
surfaces,
: > if you mix up to components you're asking for trouble.
: > -Brian
: >
: > "William Oliveri" <wuji@bigvalley.net> wrote in message
: > news:bujr9r$iaip9$1@ID-193866.news.uni-berlin.de...
: > : Thanks for the tips Steve.
: > :
: > : A question about the rockers. Are you talking about the rocker arm
: which
: > : connects across between the valve and the other rod going down into
the
: > : engine or is the rocker the rod going down into the head opposite the
: > valve?
: > :
: > : If you are talking about the rod opposite the valve which goes down
into
: > the
: > : head how do you remove this and why? Also, how do you replace it when
: > done.
: > :
: > :
: > : Thanks in advance,
: > :
: > : Bill
: > :
: > :
: > : "Steve G" <NospamforSteve@Steve-Garner.com> wrote in message
: > : news:91ePb.191732$X%5.57437@pd7tw2no...
: > : > 100 psi is fine. If you've got bad blowby or leaking valves you
made
: > need
: > : > the volume of a larger compressor to maintain 100 psi, but that's
: > : unlikely.
: > : > I wouldn't try to do it with one of those little ones intended to
: > inflate
: > : > tires only unless you can connect it to a large tank. If it can't
put
: > out
: > : > enough volume to keep up with the blowby (there's always some)
: pressure
: > : will
: > : > drop and so will the valve. You'll know as soon as you hook it up.
: If
: > : > you've never done this before a couple of notes.
: > : > Remove the rockers before applying air.
: > : > Be aware that when you plug the air in the engine is likely to turn
: over
: > a
: > : > bit to move the piston to the bottom of the stroke so watch where
your
: > : > hands, tools and cords are when you do this.
: > : > I make a habit of taking a hammer and tapping the top of the valve
: stem
: > : once
: > : > the air is holding them in place (springs still on) to ensure
they're
: > held
: > : > firmly. Then I remove the spring. A small pencil type magnet is
handy
: > for
: > : > getting the keepers out of the retainers once the spring is
: compressed,
: > : > especially if you've got fat fingers.
: > : > When reassembling , spring and keepers on and air removed take your
: > hammer
: > : > and tap the top of the valves again to make sure the keepers are
: seated
: > : > properly in the retainers. Don't forget to oil the new seals when
you
: > put
: > : > them on.
: > : > Steve
: > : > "William Oliveri" <wuji@bigvalley.net> wrote in message
: > : > news:bujn7b$i1oes$1@ID-193866.news.uni-berlin.de...
: > : > > What amount of PSI or compressor strength do I need to support the
: > : valves
: > : > > when I take the springs off?
: > : > >
: > : > > I see some advertised at 100 Max PSI. Is this enough?
: > : > >
: > : > > Comments, suggestions are welcome.
: > : > >
: > : > > Thanks,
: > : > >
: > : > > Bill
: > : > >
: > : > >
: > : >
: > : >
: > :
: > :
: >
: >
:
:

Cherokee-LTD

"William Oliveri" <wuji@bigvalley.net> wrote in message
news:buk0rk$j840q$1@ID-193866.news.uni-berlin.de...
: Thanks Steve, Cherokee, and all for the great information and tips.
:
: One curious question. You mentioned not mixing things up due to wear (I'm
: afraid I've taken off the stuff from one cylinder (rockers, rocker bridge)
: and have not noted which are which. Hopefully I'll be alright with this
: one. I'll pay attention with the rest).
:
*******Don't lose any sleep... chances are better than good that you will be
fine provided that each component shows normal wear. Do a close
inspection... if you see ANY cracking or dull surfaces, chances are the
mated surface will show the same. Change these parts. Valvetrains are very
forgiving due to hydraulic lifters but if you mix up the parts you're asking
the metal to re-conform in a very short period of time.... that's when you
will run into trouble (tick,tick,tick)

: So when you replace new parts you need to replace every component in the
: valve assembly? How does this work?
********Not necessarily. When you replace a cam, always replace the lifters.
When you do a valve job, replace the seals and springs. If you have to
replace a rocker, replace the pushrod.

-Brian

:
:
: I have a couple of references:
:
: This is from a 72 I6. I have an 83 I6 4.2 but I think it looks close.
: http://members.bigvalley.net/wuji/jeep/valve.jpg
:
:
: There's some great animations at this site:
:
: http://auto.howstuffworks.com/camshaft1.htm
: http://auto.howstuffworks.com/camshaft2.htm
:
: Thanks,
:
: Bill
:
:
:
: "Cherokee-LTD" <spammenot@home.com> wrote in message
: news:OffPb.62637$nl2.29662@news01.bloor.is.net.cab le.rogers.com...
: > Bill,
: > He's talking about the rocker which converts the upward motion of the
: > pushrod to the downward motion on the valve. Not sure about your engine
: but
: > the rocker usually pivots on a cup and secured but a bolt or it's on a
rod
: > that spans the head and retains all the rockers. The pushrod can be
: removed
: > when the rocker is out of the way simply by lifting it out of the hole.
: > While its out, roll it across a flat surface to check for bends and make
: > sure it's clean inside... when re-installing, make sure it's seated
nicely
: > in the lifter and at the rocker.
: > Typical valvetrain assembly:
: > Camshaft: elliptical lobes rotate converting rotary motion to
: reciprocating
: > motion
: > Lifter: rides on the lobe, lifts and lowers as the cam turns
: > Pushrod: Bridges the gap between the lifter and the rocker
: > Rocker Arm: Converts the upward motion of the pushrod to the downward
: motion
: > on the valve
: > Valve: I'm sure everyone has this figured out
: > TIP: When dis-assembling valvetrain components, always keep them
: > organized... #1 cyl (intake) with all its components...#1 cyl (exhaust)
: and
: > all it's components etc. Valvetrain components have so many wear
surfaces,
: > if you mix up to components you're asking for trouble.
: > -Brian
: >
: > "William Oliveri" <wuji@bigvalley.net> wrote in message
: > news:bujr9r$iaip9$1@ID-193866.news.uni-berlin.de...
: > : Thanks for the tips Steve.
: > :
: > : A question about the rockers. Are you talking about the rocker arm
: which
: > : connects across between the valve and the other rod going down into
the
: > : engine or is the rocker the rod going down into the head opposite the
: > valve?
: > :
: > : If you are talking about the rod opposite the valve which goes down
into
: > the
: > : head how do you remove this and why? Also, how do you replace it when
: > done.
: > :
: > :
: > : Thanks in advance,
: > :
: > : Bill
: > :
: > :
: > : "Steve G" <NospamforSteve@Steve-Garner.com> wrote in message
: > : news:91ePb.191732$X%5.57437@pd7tw2no...
: > : > 100 psi is fine. If you've got bad blowby or leaking valves you
made
: > need
: > : > the volume of a larger compressor to maintain 100 psi, but that's
: > : unlikely.
: > : > I wouldn't try to do it with one of those little ones intended to
: > inflate
: > : > tires only unless you can connect it to a large tank. If it can't
put
: > out
: > : > enough volume to keep up with the blowby (there's always some)
: pressure
: > : will
: > : > drop and so will the valve. You'll know as soon as you hook it up.
: If
: > : > you've never done this before a couple of notes.
: > : > Remove the rockers before applying air.
: > : > Be aware that when you plug the air in the engine is likely to turn
: over
: > a
: > : > bit to move the piston to the bottom of the stroke so watch where
your
: > : > hands, tools and cords are when you do this.
: > : > I make a habit of taking a hammer and tapping the top of the valve
: stem
: > : once
: > : > the air is holding them in place (springs still on) to ensure
they're
: > held
: > : > firmly. Then I remove the spring. A small pencil type magnet is
handy
: > for
: > : > getting the keepers out of the retainers once the spring is
: compressed,
: > : > especially if you've got fat fingers.
: > : > When reassembling , spring and keepers on and air removed take your
: > hammer
: > : > and tap the top of the valves again to make sure the keepers are
: seated
: > : > properly in the retainers. Don't forget to oil the new seals when
you
: > put
: > : > them on.
: > : > Steve
: > : > "William Oliveri" <wuji@bigvalley.net> wrote in message
: > : > news:bujn7b$i1oes$1@ID-193866.news.uni-berlin.de...
: > : > > What amount of PSI or compressor strength do I need to support the
: > : valves
: > : > > when I take the springs off?
: > : > >
: > : > > I see some advertised at 100 Max PSI. Is this enough?
: > : > >
: > : > > Comments, suggestions are welcome.
: > : > >
: > : > > Thanks,
: > : > >
: > : > > Bill
: > : > >
: > : > >
: > : >
: > : >
: > :
: > :
: >
: >
:
:

L.W.(=?iso-8859-1?Q?=DFill?=) Hughes III

I use a cardboard box and stab holes in a line with a pencil to
hold each push rod. Or a coat hanger wire and slide the chevy type
rockers down in order.
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/

William Oliveri wrote:
>
> Thanks Steve, Cherokee, and all for the great information and tips.
>
> One curious question. You mentioned not mixing things up due to wear (I'm
> afraid I've taken off the stuff from one cylinder (rockers, rocker bridge)
> and have not noted which are which. Hopefully I'll be alright with this
> one. I'll pay attention with the rest).
>
> So when you replace new parts you need to replace every component in the
> valve assembly? How does this work?
>
> I have a couple of references:
>
> This is from a 72 I6. I have an 83 I6 4.2 but I think it looks close.
> http://members.bigvalley.net/wuji/jeep/valve.jpg
>
> There's some great animations at this site:
>
> http://auto.howstuffworks.com/camshaft1.htm
> http://auto.howstuffworks.com/camshaft2.htm
>
> Thanks,
>
> Bill

L.W.(=?iso-8859-1?Q?=DFill?=) Hughes III

I use a cardboard box and stab holes in a line with a pencil to
hold each push rod. Or a coat hanger wire and slide the chevy type
rockers down in order.
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/

William Oliveri wrote:
>
> Thanks Steve, Cherokee, and all for the great information and tips.
>
> One curious question. You mentioned not mixing things up due to wear (I'm
> afraid I've taken off the stuff from one cylinder (rockers, rocker bridge)
> and have not noted which are which. Hopefully I'll be alright with this
> one. I'll pay attention with the rest).
>
> So when you replace new parts you need to replace every component in the
> valve assembly? How does this work?
>
> I have a couple of references:
>
> This is from a 72 I6. I have an 83 I6 4.2 but I think it looks close.
> http://members.bigvalley.net/wuji/jeep/valve.jpg
>
> There's some great animations at this site:
>
> http://auto.howstuffworks.com/camshaft1.htm
> http://auto.howstuffworks.com/camshaft2.htm
>
> Thanks,
>
> Bill

L.W.(=?iso-8859-1?Q?=DFill?=) Hughes III

I use a cardboard box and stab holes in a line with a pencil to
hold each push rod. Or a coat hanger wire and slide the chevy type
rockers down in order.
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/

William Oliveri wrote:
>
> Thanks Steve, Cherokee, and all for the great information and tips.
>
> One curious question. You mentioned not mixing things up due to wear (I'm
> afraid I've taken off the stuff from one cylinder (rockers, rocker bridge)
> and have not noted which are which. Hopefully I'll be alright with this
> one. I'll pay attention with the rest).
>
> So when you replace new parts you need to replace every component in the
> valve assembly? How does this work?
>
> I have a couple of references:
>
> This is from a 72 I6. I have an 83 I6 4.2 but I think it looks close.
> http://members.bigvalley.net/wuji/jeep/valve.jpg
>
> There's some great animations at this site:
>
> http://auto.howstuffworks.com/camshaft1.htm
> http://auto.howstuffworks.com/camshaft2.htm
>
> Thanks,
>
> Bill

Dave

I have heard of others filling the combustion area with some really flexible
rope and carefully bringing the piston up to TDC or close to it so the rope
pushes on the valve heads.

Just a suggestion, but make sure that the rope does not shed!
later,
dave

"William Oliveri" <wuji@bigvalley.net> wrote in message
news:bujn7b$i1oes$1@ID-193866.news.uni-berlin.de...
> What amount of PSI or compressor strength do I need to support the valves
> when I take the springs off?
>
> I see some advertised at 100 Max PSI. Is this enough?
>
> Comments, suggestions are welcome.
>
> Thanks,
>
> Bill
>
>

Dave

I have heard of others filling the combustion area with some really flexible
rope and carefully bringing the piston up to TDC or close to it so the rope
pushes on the valve heads.

Just a suggestion, but make sure that the rope does not shed!
later,
dave

"William Oliveri" <wuji@bigvalley.net> wrote in message
news:bujn7b$i1oes$1@ID-193866.news.uni-berlin.de...
> What amount of PSI or compressor strength do I need to support the valves
> when I take the springs off?
>
> I see some advertised at 100 Max PSI. Is this enough?
>
> Comments, suggestions are welcome.
>
> Thanks,
>
> Bill
>
>

Dave

I have heard of others filling the combustion area with some really flexible
rope and carefully bringing the piston up to TDC or close to it so the rope
pushes on the valve heads.

Just a suggestion, but make sure that the rope does not shed!
later,
dave

"William Oliveri" <wuji@bigvalley.net> wrote in message
news:bujn7b$i1oes$1@ID-193866.news.uni-berlin.de...
> What amount of PSI or compressor strength do I need to support the valves
> when I take the springs off?
>
> I see some advertised at 100 Max PSI. Is this enough?
>
> Comments, suggestions are welcome.
>
> Thanks,
>
> Bill
>
>