Valve Spring Replacment - 97 Wrangler

I believe they put a bad batch of springs into a few of the engines.

I 'think' Jerry B changed the springs in his for the same reason.

The lifters are just fine and are not adjustable.

Mike
86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
88 Cherokee 235 BFG AT's


Mick Miller wrote:
>
> so do they need replaced or can they ber adjusted, never doen much
> work on jeeps.
>
> >What is noisy isn't the springs but the lifters.
> >
> >
> >
> >
> >
> >"Mick Miller" > wrote in message
> .. .
> >>
> >> I have a wrangler 4ltr with very noise valve springs (think this was a
> >> known problem)
> >>
> >> how easy are they to replace and does the head need to come off?
> >>
> >>

I changed my valve springs to cure a bad recurring misfire that was
caused by a bad batch of valve springs in most '97 and some '98 4.0L
engines. The misfire caused the engine to run roughly and light the
Check Engine light but it didn't cause noisy valves. And as Mike said,
the valves are hydraulically actuated and are thus non-adjustable.

Jerry

Mike Romain wrote:
> I believe they put a bad batch of springs into a few of the engines.
>
> I 'think' Jerry B changed the springs in his for the same reason.
>
> The lifters are just fine and are not adjustable.
>
> Mike
> 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> 88 Cherokee 235 BFG AT's
>
>
> Mick Miller wrote:
>
>>so do they need replaced or can they ber adjusted, never doen much
>>work on jeeps.
>>
>>
>>>What is noisy isn't the springs but the lifters.
>>>
>>>
>>>
>>>
>>>
>>>"Mick Miller" > wrote in message
...
>>>
>>>>I have a wrangler 4ltr with very noise valve springs (think this was a
>>>>known problem)
>>>>
>>>>how easy are they to replace and does the head need to come off?
>>>>
>>>>

--
Jerry Bransford
PP-ASEL N6TAY
See the Geezer Jeep at
http://members.cox.net/jerrypb/

The only way valve springs can make noise is if they're broken. If that's the
case, noise will be the least of your worries.

More likely lifters are the cause. I think I'd try an additive like "Lifter
Free" before replacing them. Might save a few bucks if it works.

The valve spring replacement that others have referenced here was only a part of
the fix for misfire problems. The actual problem was carbon buildup on the
exhaust valves causing them to be "slow to close", thus causing a misfire.
Stronger valve springs were to help overcome this problem.



In message >, "Mick Miller" wrote:

>
>I have a wrangler 4ltr with very noise valve springs (think this was a
>known problem)
>
>how easy are they to replace and does the head need to come off?
>

i have seen the noisey lifter issue on a lot of 4.0's and some go forever
without failing i have seen some replaced at my work and actually made the
lifter noise worse
in my hipo engines i like a little chatter i know that the valves are closing
all the way there is even a shim kit made for the rocker shafts to riase the
hight

Jerry Bransford wrote:

> I changed my valve springs to cure a bad recurring misfire that was
> caused by a bad batch of valve springs in most '97 and some '98 4.0L
> engines. The misfire caused the engine to run roughly and light the
> Check Engine light but it didn't cause noisy valves. And as Mike said,
> the valves are hydraulically actuated and are thus non-adjustable.
>
> Jerry
>
> Mike Romain wrote:
> > I believe they put a bad batch of springs into a few of the engines.
> >
> > I 'think' Jerry B changed the springs in his for the same reason.
> >
> > The lifters are just fine and are not adjustable.
> >
> > Mike
> > 86/00 CJ7 Laredo, 33x9.5 BFG Muds, 'glass nose to tail in '00
> > 88 Cherokee 235 BFG AT's
> >
> >
> > Mick Miller wrote:
> >
> >>so do they need replaced or can they ber adjusted, never doen much
> >>work on jeeps.
> >>
> >>
> >>>What is noisy isn't the springs but the lifters.
> >>>
> >>>
> >>>
> >>>
> >>>
> >>>"Mick Miller" > wrote in message
> ...
> >>>
> >>>>I have a wrangler 4ltr with very noise valve springs (think this was a
> >>>>known problem)
> >>>>
> >>>>how easy are they to replace and does the head need to come off?
> >>>>
> >>>>
>
> --
> Jerry Bransford
> PP-ASEL N6TAY
> See the Geezer Jeep at
> http://members.cox.net/jerrypb/

Back in my drag racing days we used adjust the Chevy lifters to
zero rather than the one turn down to get all the lift and duration out
of a stock cam. Unfortunately some times they pumped up and suck a
valve.
God Bless America, ßill O|||||||O
http://www.billhughes.com/

mic canic wrote:
>
> i have seen the noisey lifter issue on a lot of 4.0's and some go forever
> without failing i have seen some replaced at my work and actually made the
> lifter noise worse
> in my hipo engines i like a little chatter i know that the valves are closing
> all the way there is even a shim kit made for the rocker shafts to riase the
> hight

i am no getting a missfire.

no smoke no loss of power...other than a bit of throttle crispness

.........just this tappet like noise when reved ......




>The only way valve springs can make noise is if they're broken. If that's the
>case, noise will be the least of your worries.
>
>More likely lifters are the cause. I think I'd try an additive like "Lifter
>Free" before replacing them. Might save a few bucks if it works.
>
>The valve spring replacement that others have referenced here was only a part of
>the fix for misfire problems. The actual problem was carbon buildup on the
>exhaust valves causing them to be "slow to close", thus causing a misfire.
>Stronger valve springs were to help overcome this problem.
>
>
>
>In message >, "Mick Miller" wrote:
>
>>
>>I have a wrangler 4ltr with very noise valve springs (think this was a
>>known problem)
>>
>>how easy are they to replace and does the head need to come off?
>>

Hi Mick,
You could be describing a crack in the header pipe, leaking
exhaust. The height of procrastination:
http://www.billhughes.com/brokenheader.jpg
God Bless America, ßill O|||||||O


Mick Miller wrote:
>
> i am no getting a missfire.
>
> no smoke no loss of power...other than a bit of throttle crispness
>
> ........just this tappet like noise when reved ......

L.W. ("ßill") Hughes III did pass the time by typing:
> Hi Mick,
> You could be describing a crack in the header pipe, leaking
> exhaust. The height of procrastination:
> http://www.billhughes.com/brokenheader.jpg

That defines what was bugging me for a long time till the
weld at the lower union gave me a big smily on day.

> Mick Miller wrote:
>>
>> i am no getting a missfire.
>>
>> no smoke no loss of power...other than a bit of throttle crispness
>>
>> ........just this tappet like noise when reved ......

I do think i do have a small crack pn the header pipe aswell, but the
tappet noise i am hearing is from the head.

nice pic

>Hi Mick,
> You could be describing a crack in the header pipe, leaking
>exhaust. The height of procrastination:
>http://www.billhughes.com/brokenheader.jpg
> God Bless America, ßill O|||||||O

>
>Mick Miller wrote:
>>
>> i am no getting a missfire.
>>
>> no smoke no loss of power...other than a bit of throttle crispness
>>
>> ........just this tappet like noise when reved ......

Maybe a bent push rod. Take the cover off and twist them with your
fingers as it is running.
God Bless America, ßill O|||||||O
http://www.billhughes.com/

Mica Miller wrote:
>
> I do think i do have a small crack pn the header pipe aswell, but the
> tappet noise i am hearing is from the head.
>
> nice pic