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Username Post: Roller cam valve adjustment        (Topic#237151)
gchemist 
Senior Chevytalk Moderator
Posts: 21983
gchemist
Loc: Austin, TX 78748
Reg: 05-09-00
03-06-10 08:02 PM - Post#1875209    

I need to adjust my ZZ4 valve lash. How different is the procedure from hydraulic lifters? Do rollers hydraulic lifters need a tighter lash?
The rockers are stock 1.5 ratio. How wide should I set the valve lash?




Why do I need adjustments? I drive it like I stole it.
'83 Silverardo XST - ZZ4 powered
'96 GMC Jimmy LS Ret. @236651 miles


 
fritz1990 
Senior Member
Posts: 6401
fritz1990
Age: 52
Loc: Kansas
Reg: 02-16-03
03-06-10 08:28 PM - Post#1875225    
    In response to gchemist

Not 100% sure on Hyd Rollers but think it would be the same as a Hyd FT cam, around 1/2 turn past zero.

Regards, Jeff
1998 K1500 6.5 Coal burner
1965 C10 with 498 BBC AFR Heads
1964 C10 Ran 348W for 6 years, now SBC.

Corvettes owned: '74 '77 '78 L82 Silver Anniversary, 2002 LS1

Don't have a nervous come together!

http://picasaweb.google.com/fritz199090


 
Petroholic 
Contributor
Posts: 839
Petroholic
Loc: Moses Lake, Wa.
Reg: 08-12-05
03-06-10 08:37 PM - Post#1875235    
    In response to fritz1990

Not to highjack you G, but I've heard anywhere from 1/4 turn to 3/4 turn past 0 lash on flat tappet cams.

Which is correct?



 
fritz1990 
Senior Member
Posts: 6401
fritz1990
Age: 52
Loc: Kansas
Reg: 02-16-03
03-06-10 08:41 PM - Post#1875240    
    In response to Petroholic

I have always ran mine at no more than 1/2 turn. This has been working for me for a few years.

Regards, Jeff
1998 K1500 6.5 Coal burner
1965 C10 with 498 BBC AFR Heads
1964 C10 Ran 348W for 6 years, now SBC.

Corvettes owned: '74 '77 '78 L82 Silver Anniversary, 2002 LS1

Don't have a nervous come together!

http://picasaweb.google.com/fritz199090


Edited by fritz1990 on 03-06-10 08:41 PM. Reason for edit: No reason given.

 
Pistol 
"12th Year" Silver Supporting Member
Posts: 3654
Pistol
Age: 68
Loc: Terryville, Ct.
Reg: 11-11-02
03-07-10 06:54 AM - Post#1875391    
    In response to gchemist

I emailed Comp Cams about that a while back because it use to say on their spec sheet to adjust tappets to zero lash, so I ran my new motor like that for a short time and the tappets were making noise, so that's when I emailed them with questions, they have changed all of their spec sheets from what I can tell to just say Hyd and they said 1/4 to 1/2 turn after zero
Pete
Awl speeling misteaks r myn
57 BelAir 2DRHT My-Pics


 
gchemist 
Senior Chevytalk Moderator
Posts: 21983
gchemist
Loc: Austin, TX 78748
Reg: 05-09-00
03-07-10 05:14 PM - Post#1875768    
    In response to Pistol

Pistol
I agree. I did some research on the ZZ4. Factory lash is zero. I'll set them all to zero. I guess over time the lash increased or nuts came loose. The zero lash should quiet down the valve train a little. Currently it's louder than the exhaust! The metal valve covers echo sound! I need Vette valve covers.
'83 Silverardo XST - ZZ4 powered
'96 GMC Jimmy LS Ret. @236651 miles


 
aghaga 
"4th Year" Silver Supporting Member
Posts: 1772

Age: 60
Loc: Altavista, Va.
Reg: 07-05-08
03-07-10 07:32 PM - Post#1875861    
    In response to gchemist

In essance when you adjust a hyd. to any preload it is running at zero lash. That may be what their thoughts are.

 
Anonymous 

03-07-10 08:18 PM - Post#1875895    
    In response to gchemist

I'd just do what I learned 50 years ago. Zero lash, then 1/4 to 1/2 turn...but fill the lifters with oil before starting the engine...a can full of oil, and a spare pushrod with a handle attached...PUMP ME UP!!!

Submerse the lifters in the can of oil, then push up and down, on the lifters, one at a time till they hydraulic lock...

That's what I'm planning when I change the cam in my Vortec, roller cam engine!

 
fritz1990 
Senior Member
Posts: 6401
fritz1990
Age: 52
Loc: Kansas
Reg: 02-16-03
03-07-10 08:29 PM - Post#1875903    
    In response to Bobs85PU

I gotta agree that you should have some preload on the lifters. At least a 1/4 no more than 1/2 turn.

I just dove into a 5.3 a week ago and the lifters are non adjustable but I could see the lifter plunger compress when I tighten the rockers. They are Hyd. Rollers.

Regards, Jeff
1998 K1500 6.5 Coal burner
1965 C10 with 498 BBC AFR Heads
1964 C10 Ran 348W for 6 years, now SBC.

Corvettes owned: '74 '77 '78 L82 Silver Anniversary, 2002 LS1

Don't have a nervous come together!

http://picasaweb.google.com/fritz199090


Edited by fritz1990 on 03-07-10 08:31 PM. Reason for edit: No reason given.

 
Petroholic 
Contributor
Posts: 839
Petroholic
Loc: Moses Lake, Wa.
Reg: 08-12-05
03-07-10 08:48 PM - Post#1875913    
    In response to Bobs85PU

I've got little experience building engine, but all of what I'm reading says not to soak lifters.
Maybe someone else can chime in here.



 
fritz1990 
Senior Member
Posts: 6401
fritz1990
Age: 52
Loc: Kansas
Reg: 02-16-03
03-07-10 08:52 PM - Post#1875916    
    In response to Petroholic

I have never soaked Hyd lifters before install. I have built a few over the years.

Regards, Jeff
1998 K1500 6.5 Coal burner
1965 C10 with 498 BBC AFR Heads
1964 C10 Ran 348W for 6 years, now SBC.

Corvettes owned: '74 '77 '78 L82 Silver Anniversary, 2002 LS1

Don't have a nervous come together!

http://picasaweb.google.com/fritz199090


 
gchemist 
Senior Chevytalk Moderator
Posts: 21983
gchemist
Loc: Austin, TX 78748
Reg: 05-09-00
03-07-10 09:04 PM - Post#1875925    
    In response to Petroholic

  • Petroholic Said:
I've got little experience building engine, but all of what I'm reading says not to soak lifters.
Maybe someone else can chime in here.



Hydraulic lifters spin in their bore. Roller hydraulic lifters don't spin in their bore.
'83 Silverardo XST - ZZ4 powered
'96 GMC Jimmy LS Ret. @236651 miles


 
C10 Sleeper 
Valued Contributor
Posts: 3426
C10 Sleeper
Loc: Redding Ca
Reg: 03-17-09
03-08-10 02:23 PM - Post#1876301    
    In response to gchemist

I have never soaked my lifters in oil I usually set mine at 1/4 turn past 0 lash while installing them then do them while the motor is running and just tighten them until they stop clacking. I have an old tall valve cover with a slot cut out the length of the top of the cover just wide enough to get a socket onto the nuts. I can adjust my valves while the motor is running and not make a mess doing it.
http://photobucket.com/C10Pictures


 
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