Can the guide plates be removed?
Thread Starter
Melting Slicks
Joined: Sep 2003
Posts: 2,269
Likes: 118
From: N. Babylon NY
Can the guide plates be removed?
Hi,
Car:1992 LT1
I recently installed new lifters, LT4 springs, and 1.6 self align/rockers.
Engine runs fine, smooth, etc...However the right side seems to tap ( always has).
I am thinking that maybe it's the push rods against the guide plates. If I shim the studs to compensate the difference would there be any other possible issues?
Thanks!
Steve
Car:1992 LT1
I recently installed new lifters, LT4 springs, and 1.6 self align/rockers.
Engine runs fine, smooth, etc...However the right side seems to tap ( always has).
I am thinking that maybe it's the push rods against the guide plates. If I shim the studs to compensate the difference would there be any other possible issues?
Thanks!
Steve
Race Director
Joined: Jan 2005
Posts: 10,641
Likes: 13
From: Slidell Louisiana
Since your using self aligning rockers you can remove the guideplates. You may have long enough studs to remove the guideplates without using spacer. (rockers are held down on the stud by polylocks so if stud is long enough removal of guideplate is a non-issue) However, I don't believe guideplates are going to cause a tapping noise.
On a different note 95 did not have guideplates when it was stock; however, a buddy's 92 did.
Mike
On a different note 95 did not have guideplates when it was stock; however, a buddy's 92 did.
Mike
Thread Starter
Melting Slicks
Joined: Sep 2003
Posts: 2,269
Likes: 118
From: N. Babylon NY
Thanks guys for the quick response!
Being as the 1.6 ratio is shorter than the 1.5, would'nt the push rod be closer (to the rear side of the guide plate-header side) and maybe touch slightly?
I will remove them and post if it made any difference.
Thanks again,
Steve
Being as the 1.6 ratio is shorter than the 1.5, would'nt the push rod be closer (to the rear side of the guide plate-header side) and maybe touch slightly?
I will remove them and post if it made any difference.
Thanks again,
Steve
Le Mans Master
Joined: Jul 2007
Posts: 5,043
Likes: 7
From: Tampa Florida
Hi,
Car:1992 LT1
I recently installed new lifters, LT4 springs, and 1.6 self align/rockers.
Engine runs fine, smooth, etc...However the right side seems to tap ( always has).
I am thinking that maybe it's the push rods against the guide plates. If I shim the studs to compensate the difference would there be any other possible issues?
Thanks!
Steve
Car:1992 LT1
I recently installed new lifters, LT4 springs, and 1.6 self align/rockers.
Engine runs fine, smooth, etc...However the right side seems to tap ( always has).
I am thinking that maybe it's the push rods against the guide plates. If I shim the studs to compensate the difference would there be any other possible issues?
Thanks!
Steve
Are the rocker studs all tight? (Use a crow's foot to check'em)
Could be a loud fuel injector!?
Try a thinner motor oil or switch to synthetic...the old/new lifters may not like the oil your using (hydrolic roller lifters use an internal cushion of oil to raise the rod seat. Could be debree inside that "right" side of the block partially blocking (starving) the oil passages for the lifters.
Leave the plates alone these are not the noise!
Thread Starter
Melting Slicks
Joined: Sep 2003
Posts: 2,269
Likes: 118
From: N. Babylon NY
Thread Starter
Melting Slicks
Joined: Sep 2003
Posts: 2,269
Likes: 118
From: N. Babylon NY
You should have changed the push rods too. Old parts -- even though they look good -- they can cause these types of problems.
Are the rocker studs all tight? (Use a crow's foot to check'em)
Could be a loud fuel injector!?
Try a thinner motor oil or switch to synthetic...the old/new lifters may not like the oil your using (hydrolic roller lifters use an internal cushion of oil to raise the rod seat. Could be debree inside that "right" side of the block partially blocking (starving) the oil passages for the lifters.
Leave the plates alone these are not the noise!
Are the rocker studs all tight? (Use a crow's foot to check'em)
Could be a loud fuel injector!?
Try a thinner motor oil or switch to synthetic...the old/new lifters may not like the oil your using (hydrolic roller lifters use an internal cushion of oil to raise the rod seat. Could be debree inside that "right" side of the block partially blocking (starving) the oil passages for the lifters.
Leave the plates alone these are not the noise!
Rocker studs are tight. Yes the fuel injectors make noise-but this is valve train related.
I have tried 5w 30 and 5w 50 (5w 50 is what I run at the track)
Oil is getting to all rockers as I ran it with the covers off and can see.
The push rods appear to be ok-but I will re-check them.
I will post my results.
Thanks for your help!
Steve
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Thread Starter
Melting Slicks
Joined: Sep 2003
Posts: 2,269
Likes: 118
From: N. Babylon NY
Instructor
Joined: Jun 2006
Posts: 152
Likes: 0
From: louisville Kentucky
why would it only tap on the right side?if it is a valvetrain noise,can you isolate the particular cylinder noise and if its intake or exhaust?or both?ive seen camshaft lobe ramps cause this issue before.the rocker oiling check was a good idea.have you tried to adjust the noisy rocker or rockers with engine running?i would check the rocker position where it contacts the tip of the valve.a mushroomed valve tip or valve guide problem could cause incorrect alignment.you mentioned it didnt have solid lifters, so in theory oil pressure should take care of adjustment after preload.good luck.junior
Safety Car
Joined: May 2006
Posts: 4,290
Likes: 140
From: Salem NH
why would it only tap on the right side?if it is a valvetrain noise,can you isolate the particular cylinder noise and if its intake or exhaust?or both?ive seen camshaft lobe ramps cause this issue before.the rocker oiling check was a good idea.have you tried to adjust the noisy rocker or rockers with engine running?i would check the rocker position where it contacts the tip of the valve.a mushroomed valve tip or valve guide problem could cause incorrect alignment.you mentioned it didnt have solid lifters, so in theory oil pressure should take care of adjustment after preload.good luck.junior
-- Joe
Burning Brakes
Joined: Nov 2005
Posts: 908
Likes: 1
From: Colorado Springs Colorado
The plates that came on my 92 had the exact same markings as the new GM guide plates I bought to replace them when I did my heads. Drawing a file against them they seemed to be hardened too (maybe just case hardened, but not just untreated mild steel).
Safety Car
Joined: May 2006
Posts: 4,290
Likes: 140
From: Salem NH
Corvette forum rule #1: Don't trust anything you read, check it, measure it, verify it yourself.
-- Joe
Instructor
Joined: Mar 2006
Posts: 174
Likes: 1
From: Bettendor Iowa
I certainly don't want to give misleading advice here but I have heard that you do NOT want to run with self-aligning rocker arms and guideplates at the same time....from what I understand, they can tend to "fight" each other, causing unwanted friction/binding.
Anyone else know anything about this?
Anyone else know anything about this?
Burning Brakes
Joined: Nov 2005
Posts: 908
Likes: 1
From: Colorado Springs Colorado
Like I said, my car came from the factory with the self aligning rockers, and "assembly plates" that were dimensionally identical and stamped with the same part numbers as GM guide plates.
Race Director
Joined: Jan 2005
Posts: 10,641
Likes: 13
From: Slidell Louisiana
I was going to mention your car but didn't.
However, I was there and Steve's car had (plates) with the same markings as the GMPP GUIDEPLATES and his car seemed to be an unmolested stocker.