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Next: 2004 sebring 2.4l 16 v engine 118000 kms on clock
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External
Since: Nov 12, 2008
Posts: 2
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(Msg. 1) Posted: Wed Nov 12, 2008 7:28 pm
Post subject: valve lash adjustment
Archived from groups: alt>autos>classic-trucks (more info?)
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I do not know the history of my motor, but I have run into a situation that
I could use a little input on.
It is a Chevrolet 350. I had a noisy valve, and found I could
not adjust the lash on #7 intake. Long story short, I pulled the cam, and
found the lobe to be extremely worn. In my approximation, 1/2 inch. Also
intake on #5 was also worn, almost to the same extent. I bought a new cam,
and have installed it. However, I am still unable to adjust the lash on #7
intake. With the cam and lifters being new, and all the push rods the same
length, that only leaves the valve springs. All the rocker arms arms look
good, and also the studs.
I know there are some good mechanical minds out there. I truly appreciate
any thoughts anyone might have on the situation. Thanks, in advance.
Thanks,
Ken
1970 C-10 |
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External
Since: May 25, 2004
Posts: 9
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(Msg. 2) Posted: Wed Nov 12, 2008 7:28 pm
Post subject: Re: valve lash adjustment [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
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earthlink newgroups wrote:
> I do not know the history of my motor, but I have run into a situation that
> I could use a little input on.
>
> It is a Chevrolet 350. I had a noisy valve, and found I could
> not adjust the lash on #7 intake. Long story short, I pulled the cam, and
> found the lobe to be extremely worn. In my approximation, 1/2 inch. Also
> intake on #5 was also worn, almost to the same extent. I bought a new cam,
> and have installed it. However, I am still unable to adjust the lash on #7
> intake. With the cam and lifters being new, and all the push rods the same
> length, that only leaves the valve springs. All the rocker arms arms look
> good, and also the studs.
>
> I know there are some good mechanical minds out there. I truly appreciate
> any thoughts anyone might have on the situation. Thanks, in advance.
>
>
> Thanks,
> Ken
> 1970 C-10
It's been awhile since I've worked on a Chevy, but just from your
description, my guess would be that you have a couple of valves
sticking. This would be causing the rocker arms to wear on the lobes of
the cam, thereby causing the cam lobes to wear down.
I could be wrong, but the only solution I can think of is removal of the
head to facilitate the removal of the stuck valves. You should be able
to pick up a new set of valves, valve guides, and springs at your local
auto shop since the Chevy 350 is an extremely common engine.
You may also want to check the rocker arms to make sure they are not
warn from the sticking lifters. Don't forget to get a new head gasket
since removal of the head will probably destroy the existing one.
Just my thoughts. Hope things work out for you.
Eric |
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External
Since: Sep 30, 2008
Posts: 5
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(Msg. 3) Posted: Thu Nov 13, 2008 4:24 am
Post subject: Re: valve lash adjustment [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
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"Eric" wrote in message
> earthlink newgroups wrote:
>> I do not know the history of my motor, but I have run into a situation
>> that
>> I could use a little input on.
>>
>> It is a Chevrolet 350. I had a noisy valve, and found I could
>> not adjust the lash on #7 intake. Long story short, I pulled the cam, and
>> found the lobe to be extremely worn. In my approximation, 1/2 inch. Also
>> intake on #5 was also worn, almost to the same extent. I bought a new
>> cam,
>> and have installed it. However, I am still unable to adjust the lash on
>> #7
>> intake. With the cam and lifters being new, and all the push rods the
>> same
>> length, that only leaves the valve springs. All the rocker arms arms look
>> good, and also the studs.
>>
>> I know there are some good mechanical minds out there. I truly
>> appreciate
>> any thoughts anyone might have on the situation. Thanks, in advance.
>>
>>
>> Thanks,
>> Ken
>> 1970 C-10
> It's been awhile since I've worked on a Chevy, but just from your
> description, my guess would be that you have a couple of valves sticking.
> This would be causing the rocker arms to wear on the lobes of the cam,
> thereby causing the cam lobes to wear down.
>
> I could be wrong, but the only solution I can think of is removal of the
> head to facilitate the removal of the stuck valves. You should be able to
> pick up a new set of valves, valve guides, and springs at your local auto
> shop since the Chevy 350 is an extremely common engine.
>
> You may also want to check the rocker arms to make sure they are not warn
> from the sticking lifters. Don't forget to get a new head gasket since
> removal of the head will probably destroy the existing one.
>
> Just my thoughts. Hope things work out for you.
>
> Eric
I'd measure the height of the studs. I had one pull out of the head one
time. Used to be fairly common.
--
Old Crow
'82 FLTC 'Pearl'
'87 FLTC 'Fugly'
'61 F-100
BS#133, SENS, TOMKAT, SLOB#13, MAMBM >> Stay informed about: valve lash adjustment |
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External
Since: Jan 17, 2007
Posts: 5
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(Msg. 4) Posted: Wed Nov 26, 2008 8:41 pm
Post subject: Re: valve lash adjustment [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
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I know from experience that it is possible that the nuts back off real easy
if they are not changed at the same time. USE NEW LOCK NUTS. It was an
expensive lesson for me on a "completely rebuilt every thing new engine".
I've also had good luck with a rawhide mallet and a constant stream of PB
Blaster shooting down the guides while persuading it not to stick a few
hundred times, then a follow up with marvel mystery oil or risolene
treatment. And by any chance did you heat and bleed the air out of the
lifters before you put them in? I heat them up in a pot of oil on the stove,
not hot enough to varnish, but you'll see the bubbles keep coming out.
Good Luck
"earthlink newgroups" wrote in message
>I do not know the history of my motor, but I have run into a situation that
> I could use a little input on.
>
> It is a Chevrolet 350. I had a noisy valve, and found I could
> not adjust the lash on #7 intake. Long story short, I pulled the cam, and
> found the lobe to be extremely worn. In my approximation, 1/2 inch. Also
> intake on #5 was also worn, almost to the same extent. I bought a new cam,
> and have installed it. However, I am still unable to adjust the lash on #7
> intake. With the cam and lifters being new, and all the push rods the
> same
> length, that only leaves the valve springs. All the rocker arms arms look
> good, and also the studs.
>
> I know there are some good mechanical minds out there. I truly appreciate
> any thoughts anyone might have on the situation. Thanks, in advance.
>
>
> Thanks,
> Ken
> 1970 C-10 >> Stay informed about: valve lash adjustment |
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External
Since: Oct 28, 2007
Posts: 2
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(Msg. 5) Posted: Fri Nov 28, 2008 8:50 pm
Post subject: Re: valve lash adjustment [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
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Well, it turned out to be one of the studs had backed out. GM heads. I
found it by placing a small ruler over a couple of studs. It was up about
3/8 of an inch. I put an old rocker arm nut on it, and whacked it back
down. I just got the truck back together yesterday. And it runs AWESOME!
Lots more power, and no more knocking noises.
Thansk to all that had input.
Ken
"earthlink newgroups" wrote in message
>I do not know the history of my motor, but I have run into a situation that
> I could use a little input on.
>
> It is a Chevrolet 350. I had a noisy valve, and found I could
> not adjust the lash on #7 intake. Long story short, I pulled the cam, and
> found the lobe to be extremely worn. In my approximation, 1/2 inch. Also
> intake on #5 was also worn, almost to the same extent. I bought a new cam,
> and have installed it. However, I am still unable to adjust the lash on #7
> intake. With the cam and lifters being new, and all the push rods the
> same
> length, that only leaves the valve springs. All the rocker arms arms look
> good, and also the studs.
>
> I know there are some good mechanical minds out there. I truly appreciate
> any thoughts anyone might have on the situation. Thanks, in advance.
>
>
> Thanks,
> Ken
> 1970 C-10 >> Stay informed about: valve lash adjustment |
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Joined: Jul 26, 2010
Posts: 20
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(Msg. 6) Posted: Mon Aug 09, 2010 1:26 am
Post subject: Re: valve lash adjustment [Login to view extended thread Info.]
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