Help! doing the 4.0 head swap on a 258!
08-11-2004, 06:08 PM
#41
Guest
Posts: n/a
Re: Help! doing the 4.0 head swap on a 258!
That's got to be it, especially since Harris, seemed more concerned
about number one tight, than the others.
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/
Mike Romain wrote:
>
> No.
>
> You have 2 TDC's. One has the valves closed, one has them both open.
> Check the distributor's position.
>
> Mike
about number one tight, than the others.
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/
Mike Romain wrote:
>
> No.
>
> You have 2 TDC's. One has the valves closed, one has them both open.
> Check the distributor's position.
>
> Mike
08-11-2004, 07:25 PM
#42
Guest
Posts: n/a
Re: Help! doing the 4.0 head swap on a 258!
On Wed, 11 Aug 2004 01:35:08 GMT, "Harris Family"
<SHARRIS11nospam@san.rr.com> wrote:
>Folks, I'm in a pickle!
>Hope you can help me. I'm in the process of doing the head swap on my '86
>CJ7. Got the head installed no problem. Here's my catch, when I went to put
>the 258 stock rockers and pushrods back in, my valves were opened on #1 cyl
>when its at TDC. AS we all know this is not good for compression. Apparently
>either my pushrods are too long or something in the rockers is amiss. Got
>any ideas? Should I be using 4.0l rockers, pivot assemblies, and pushrods
>instead of the old 258 engine parts?
>Thanks for your help.
>Rich Harris
>
>
and make sure that you have the pushrod seated in the lifter bore and
not canted slightly off kilter where it is sitting on the raised edge
<SHARRIS11nospam@san.rr.com> wrote:
>Folks, I'm in a pickle!
>Hope you can help me. I'm in the process of doing the head swap on my '86
>CJ7. Got the head installed no problem. Here's my catch, when I went to put
>the 258 stock rockers and pushrods back in, my valves were opened on #1 cyl
>when its at TDC. AS we all know this is not good for compression. Apparently
>either my pushrods are too long or something in the rockers is amiss. Got
>any ideas? Should I be using 4.0l rockers, pivot assemblies, and pushrods
>instead of the old 258 engine parts?
>Thanks for your help.
>Rich Harris
>
>
and make sure that you have the pushrod seated in the lifter bore and
not canted slightly off kilter where it is sitting on the raised edge
08-11-2004, 07:25 PM
#43
Guest
Posts: n/a
Re: Help! doing the 4.0 head swap on a 258!
On Wed, 11 Aug 2004 01:35:08 GMT, "Harris Family"
<SHARRIS11nospam@san.rr.com> wrote:
>Folks, I'm in a pickle!
>Hope you can help me. I'm in the process of doing the head swap on my '86
>CJ7. Got the head installed no problem. Here's my catch, when I went to put
>the 258 stock rockers and pushrods back in, my valves were opened on #1 cyl
>when its at TDC. AS we all know this is not good for compression. Apparently
>either my pushrods are too long or something in the rockers is amiss. Got
>any ideas? Should I be using 4.0l rockers, pivot assemblies, and pushrods
>instead of the old 258 engine parts?
>Thanks for your help.
>Rich Harris
>
>
and make sure that you have the pushrod seated in the lifter bore and
not canted slightly off kilter where it is sitting on the raised edge
<SHARRIS11nospam@san.rr.com> wrote:
>Folks, I'm in a pickle!
>Hope you can help me. I'm in the process of doing the head swap on my '86
>CJ7. Got the head installed no problem. Here's my catch, when I went to put
>the 258 stock rockers and pushrods back in, my valves were opened on #1 cyl
>when its at TDC. AS we all know this is not good for compression. Apparently
>either my pushrods are too long or something in the rockers is amiss. Got
>any ideas? Should I be using 4.0l rockers, pivot assemblies, and pushrods
>instead of the old 258 engine parts?
>Thanks for your help.
>Rich Harris
>
>
and make sure that you have the pushrod seated in the lifter bore and
not canted slightly off kilter where it is sitting on the raised edge
08-11-2004, 07:25 PM
#44
Guest
Posts: n/a
Re: Help! doing the 4.0 head swap on a 258!
On Wed, 11 Aug 2004 01:35:08 GMT, "Harris Family"
<SHARRIS11nospam@san.rr.com> wrote:
>Folks, I'm in a pickle!
>Hope you can help me. I'm in the process of doing the head swap on my '86
>CJ7. Got the head installed no problem. Here's my catch, when I went to put
>the 258 stock rockers and pushrods back in, my valves were opened on #1 cyl
>when its at TDC. AS we all know this is not good for compression. Apparently
>either my pushrods are too long or something in the rockers is amiss. Got
>any ideas? Should I be using 4.0l rockers, pivot assemblies, and pushrods
>instead of the old 258 engine parts?
>Thanks for your help.
>Rich Harris
>
>
and make sure that you have the pushrod seated in the lifter bore and
not canted slightly off kilter where it is sitting on the raised edge
<SHARRIS11nospam@san.rr.com> wrote:
>Folks, I'm in a pickle!
>Hope you can help me. I'm in the process of doing the head swap on my '86
>CJ7. Got the head installed no problem. Here's my catch, when I went to put
>the 258 stock rockers and pushrods back in, my valves were opened on #1 cyl
>when its at TDC. AS we all know this is not good for compression. Apparently
>either my pushrods are too long or something in the rockers is amiss. Got
>any ideas? Should I be using 4.0l rockers, pivot assemblies, and pushrods
>instead of the old 258 engine parts?
>Thanks for your help.
>Rich Harris
>
>
and make sure that you have the pushrod seated in the lifter bore and
not canted slightly off kilter where it is sitting on the raised edge
08-11-2004, 07:25 PM
#45
Guest
Posts: n/a
Re: Help! doing the 4.0 head swap on a 258!
On Wed, 11 Aug 2004 01:35:08 GMT, "Harris Family"
<SHARRIS11nospam@san.rr.com> wrote:
>Folks, I'm in a pickle!
>Hope you can help me. I'm in the process of doing the head swap on my '86
>CJ7. Got the head installed no problem. Here's my catch, when I went to put
>the 258 stock rockers and pushrods back in, my valves were opened on #1 cyl
>when its at TDC. AS we all know this is not good for compression. Apparently
>either my pushrods are too long or something in the rockers is amiss. Got
>any ideas? Should I be using 4.0l rockers, pivot assemblies, and pushrods
>instead of the old 258 engine parts?
>Thanks for your help.
>Rich Harris
>
>
and make sure that you have the pushrod seated in the lifter bore and
not canted slightly off kilter where it is sitting on the raised edge
<SHARRIS11nospam@san.rr.com> wrote:
>Folks, I'm in a pickle!
>Hope you can help me. I'm in the process of doing the head swap on my '86
>CJ7. Got the head installed no problem. Here's my catch, when I went to put
>the 258 stock rockers and pushrods back in, my valves were opened on #1 cyl
>when its at TDC. AS we all know this is not good for compression. Apparently
>either my pushrods are too long or something in the rockers is amiss. Got
>any ideas? Should I be using 4.0l rockers, pivot assemblies, and pushrods
>instead of the old 258 engine parts?
>Thanks for your help.
>Rich Harris
>
>
and make sure that you have the pushrod seated in the lifter bore and
not canted slightly off kilter where it is sitting on the raised edge
08-11-2004, 07:32 PM
#46
Guest
Posts: n/a
Re: Help! doing the 4.0 head swap on a 258!
That happens every time I tighten them down without spinning them
as I tighten.
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/
AllNighter wrote:
>
> and make sure that you have the pushrod seated in the lifter bore and
> not canted slightly off kilter where it is sitting on the raised edge
as I tighten.
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/
AllNighter wrote:
>
> and make sure that you have the pushrod seated in the lifter bore and
> not canted slightly off kilter where it is sitting on the raised edge
08-11-2004, 07:32 PM
#47
Guest
Posts: n/a
Re: Help! doing the 4.0 head swap on a 258!
That happens every time I tighten them down without spinning them
as I tighten.
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/
AllNighter wrote:
>
> and make sure that you have the pushrod seated in the lifter bore and
> not canted slightly off kilter where it is sitting on the raised edge
as I tighten.
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/
AllNighter wrote:
>
> and make sure that you have the pushrod seated in the lifter bore and
> not canted slightly off kilter where it is sitting on the raised edge
08-11-2004, 07:32 PM
#48
Guest
Posts: n/a
Re: Help! doing the 4.0 head swap on a 258!
That happens every time I tighten them down without spinning them
as I tighten.
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/
AllNighter wrote:
>
> and make sure that you have the pushrod seated in the lifter bore and
> not canted slightly off kilter where it is sitting on the raised edge
as I tighten.
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/
AllNighter wrote:
>
> and make sure that you have the pushrod seated in the lifter bore and
> not canted slightly off kilter where it is sitting on the raised edge
08-11-2004, 07:32 PM
#49
Guest
Posts: n/a
Re: Help! doing the 4.0 head swap on a 258!
That happens every time I tighten them down without spinning them
as I tighten.
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/
AllNighter wrote:
>
> and make sure that you have the pushrod seated in the lifter bore and
> not canted slightly off kilter where it is sitting on the raised edge
as I tighten.
God Bless America, ßill O|||||||O
mailto:-------------------- http://www.----------.com/
AllNighter wrote:
>
> and make sure that you have the pushrod seated in the lifter bore and
> not canted slightly off kilter where it is sitting on the raised edge
08-11-2004, 09:07 PM
#50
Guest
Posts: n/a
Re: Help! doing the 4.0 head swap on a 258!
I know how to go to TDC. I just used #1 as an example. Give me an ounce of
credit here guys. All cylinders are wrong. The head must have been
resurfaced as well as the block. I went down to Crower this afternoon and
they gave me an adjustable pushrod and a Mechanical lifter. I'm going that
route. Unless you guys can give me a viable alternative.
Rich Harris.
PS I've rebuilt a bunch of engines but never had to resize pushrods for a
hydraulic cam.....always a first time....I'm going back to GM small blocks
where you can mechanically adjust.
"Mike Romain" <romainm@sympatico.ca> wrote in message
news:411A67B3.83A0E781@sympatico.ca...
> You use the 4.2 ones.
>
> Mike
>
> CRWLR wrote:
> >
> > Spin the crank one full rotation.
> >
> > the crank goes around twice for every rotation of the cam, so the crank
can
> > be at the top on one rotation, and the valves are in transition between
> > exhaust open and intake open. You would have troubles putting the
pushrods
> > in if this were the case.
> >
> > Having said that, the rockers and pushrods on the 4.0 could easily be
> > different than on the 4.2.
> >
> > "Harris Family" <SHARRIS11nospam@san.rr.com> wrote in message
> > news:xLoSc.1431$aB1.1397@twister.socal.rr.com...
> > > The distributor position is irrelevant in this case. The valves are
open
> > > because either the pushrods are too long or the rockers are of an
> > incorrect
> > > design for this head. I never removed the distributor during this
whole
> > > operation. All I did was pull the old head and bolt on the new.
> > > "Jo Bo" <jromas@columbus.rr.com> wrote in message
> > > news:08mSc.11877$Nl1.1300@fe1.columbus.rr.com...
> > > > Maybe a dumb question but have you checked the position of the
> > distributor
> > > > rotor for pointing to #1 cylinder? If not try turning the crank 360
> > > degrees.
> > > >
> > > > JoBo
> > > >
> > > > "Harris Family" <SHARRIS11nospam@san.rr.com> wrote in message
> > > > news:gJeSc.3870$Qa4.538@twister.socal.rr.com...
> > > > > Folks, I'm in a pickle!
> > > > > Hope you can help me. I'm in the process of doing the head swap on
my
> > > '86
> > > > > CJ7. Got the head installed no problem. Here's my catch, when I
went
> > to
> > > put
> > > > > the 258 stock rockers and pushrods back in, my valves were opened
on
> > #1
> > > cyl
> > > > > when its at TDC. AS we all know this is not good for compression.
> > > Apparently
> > > > > either my pushrods are too long or something in the rockers is
amiss.
> > > Got
> > > > > any ideas? Should I be using 4.0l rockers, pivot assemblies, and
> > > pushrods
> > > > > instead of the old 258 engine parts?
> > > > > Thanks for your help.
> > > > > Rich Harris
> > > > >
> > > > >
> > > >
> > > >
> > >
> > >
credit here guys. All cylinders are wrong. The head must have been
resurfaced as well as the block. I went down to Crower this afternoon and
they gave me an adjustable pushrod and a Mechanical lifter. I'm going that
route. Unless you guys can give me a viable alternative.
Rich Harris.
PS I've rebuilt a bunch of engines but never had to resize pushrods for a
hydraulic cam.....always a first time....I'm going back to GM small blocks
where you can mechanically adjust.
"Mike Romain" <romainm@sympatico.ca> wrote in message
news:411A67B3.83A0E781@sympatico.ca...
> You use the 4.2 ones.
>
> Mike
>
> CRWLR wrote:
> >
> > Spin the crank one full rotation.
> >
> > the crank goes around twice for every rotation of the cam, so the crank
can
> > be at the top on one rotation, and the valves are in transition between
> > exhaust open and intake open. You would have troubles putting the
pushrods
> > in if this were the case.
> >
> > Having said that, the rockers and pushrods on the 4.0 could easily be
> > different than on the 4.2.
> >
> > "Harris Family" <SHARRIS11nospam@san.rr.com> wrote in message
> > news:xLoSc.1431$aB1.1397@twister.socal.rr.com...
> > > The distributor position is irrelevant in this case. The valves are
open
> > > because either the pushrods are too long or the rockers are of an
> > incorrect
> > > design for this head. I never removed the distributor during this
whole
> > > operation. All I did was pull the old head and bolt on the new.
> > > "Jo Bo" <jromas@columbus.rr.com> wrote in message
> > > news:08mSc.11877$Nl1.1300@fe1.columbus.rr.com...
> > > > Maybe a dumb question but have you checked the position of the
> > distributor
> > > > rotor for pointing to #1 cylinder? If not try turning the crank 360
> > > degrees.
> > > >
> > > > JoBo
> > > >
> > > > "Harris Family" <SHARRIS11nospam@san.rr.com> wrote in message
> > > > news:gJeSc.3870$Qa4.538@twister.socal.rr.com...
> > > > > Folks, I'm in a pickle!
> > > > > Hope you can help me. I'm in the process of doing the head swap on
my
> > > '86
> > > > > CJ7. Got the head installed no problem. Here's my catch, when I
went
> > to
> > > put
> > > > > the 258 stock rockers and pushrods back in, my valves were opened
on
> > #1
> > > cyl
> > > > > when its at TDC. AS we all know this is not good for compression.
> > > Apparently
> > > > > either my pushrods are too long or something in the rockers is
amiss.
> > > Got
> > > > > any ideas? Should I be using 4.0l rockers, pivot assemblies, and
> > > pushrods
> > > > > instead of the old 258 engine parts?
> > > > > Thanks for your help.
> > > > > Rich Harris
> > > > >
> > > > >
> > > >
> > > >
> > >
> > >
