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Pushrod engines; hydraulic lifters and valve lash settings #4493523
08/20/17 10:13 AM
08/20/17 10:13 AM
Joined: Nov 2012
Posts: 234
NorCal
Seventh Offline OP
Seventh  Offline OP
Joined: Nov 2012
Posts: 234
NorCal
Getting ready to adjust valves on the old hot rod truck, I've been hearing a tapping noise from passenger side valve train area. Pretty sure I had a lock nut come loose on the roller rocker...

I've always done a half turn after achieving zero lash using the old "spin the pushrod" technique. Ford, chevy, whatever it is, always done a half turn.

Some guys say quarter turn, full turn, I've heard "1/8th turn for racing," etc.

I'm not asking for advice here, just wondering what others do, and why this seems to be a never ending debate among hot rodders. If you ask 10 people you will get 10 answers

Re: Pushrod engines; hydraulic lifters and valve lash settings [Re: Seventh] #4493541
08/20/17 10:35 AM
08/20/17 10:35 AM
Joined: Oct 2010
Posts: 7,002
Michigan
A_Harman Offline
A_Harman  Offline
Joined: Oct 2010
Posts: 7,002
Michigan
On my small block Chevy, I spin the pushrod while tightening down the rocker arm nut until I can't spin it anymore (that's assumed to be zero lash), then go an extra 1/2-turn. The Chevy Power manual describes a method where the engine is run with all the valves adjusted using the basic method, and back off each nut until you hear the lifter tick, then tighten down the nut until the lifter stops ticking. This is called "zero lashing". Other engines may use different methods because they are constructed differently.


1985 Z51 Corvette track car
2002 Camaro Z28 LS1/6-speed
2001 Dodge Ram 2500 diesel
1972 GMC 1500 shortbed project truck
Re: Pushrod engines; hydraulic lifters and valve lash settings [Re: Seventh] #4493552
08/20/17 10:44 AM
08/20/17 10:44 AM
Joined: Jun 2014
Posts: 737
Northern Arizona
funflyer Offline
funflyer  Offline
Joined: Jun 2014
Posts: 737
Northern Arizona
I've always set them at .030 and use a dial indicator at the lifter plunger. Also, when using a rocker nut with a setscrew, I finish the adjustment while turning both at the same time so they won't come loose.


2016 Prius 1.8L
2001 Tacoma 2.4L
1966 GTO 6.5L
2015 Cub Cadet
Honda CT70 (X6)
Re: Pushrod engines; hydraulic lifters and valve lash settings [Re: Seventh] #4493587
08/20/17 11:35 AM
08/20/17 11:35 AM
Joined: Jan 2007
Posts: 17,501
Clovis, CA
Merkava_4 Offline
Merkava_4  Offline
Joined: Jan 2007
Posts: 17,501
Clovis, CA
On the 351 Cleveland, I torque the rocker arm bolts to the torque spec. Ford had a better idea. smile

Re: Pushrod engines; hydraulic lifters and valve lash settings [Re: Seventh] #4493607
08/20/17 12:04 PM
08/20/17 12:04 PM
Joined: Jun 2003
Posts: 17,361
Deplorable in apple valley, ca
Chris142 Offline
Chris142  Offline
Joined: Jun 2003
Posts: 17,361
Deplorable in apple valley, ca
Iirc the gm book says 3/4 turn after the noise stops.


02 Wrangler durablend 10w40
87 F250 traveler 15w40
04 Tahoe super-s 10w30
Z400 castrol T 10w40
Can am maveric edge 5w40
57 case tractor 15w40
Re: Pushrod engines; hydraulic lifters and valve lash settings [Re: Seventh] #4493934
08/20/17 07:17 PM
08/20/17 07:17 PM
Joined: Dec 2002
Posts: 40,894
'Stralia
Shannow Online content
Shannow  Online Content
Joined: Dec 2002
Posts: 40,894
'Stralia
On my Holden 6s (that used the chev arrangement), I did the running adjustment once, and once only.

After that used the finger twist and 1/8 turn...I used to rev those REALLY hard, and didn't want "pump up".

Re: Pushrod engines; hydraulic lifters and valve lash settings [Re: Seventh] #4493948
08/20/17 07:27 PM
08/20/17 07:27 PM
Joined: Jul 2003
Posts: 4,754
New Zealand
Silk Offline
Silk  Offline
Joined: Jul 2003
Posts: 4,754
New Zealand
We used to do them running - oil everywhere. Back off until they clack, then down 1/2 or 3/4 turn...there was usually a spec.


1987 BMW R65 - Penrite V Twin 20/50
2005 Nissan Expert - Gulf Western 10W-40
1996 Volvo T5 - Penrite HPR15 - 15W-60. Ryco syntec filter.
Re: Pushrod engines; hydraulic lifters and valve lash settings [Re: Merkava_4] #4493964
08/20/17 07:47 PM
08/20/17 07:47 PM
Joined: Jun 2014
Posts: 737
Northern Arizona
funflyer Offline
funflyer  Offline
Joined: Jun 2014
Posts: 737
Northern Arizona
Originally Posted By: Merkava_4
On the 351 Cleveland, I torque the rocker arm bolts to the torque spec. Ford had a better idea. smile



My 66 389 is the same but too many variables make it not very accurate, i.e. deck mill, head gasket thickness, valve stem height and rocker ratio. Much easier to make them adjustable.


2016 Prius 1.8L
2001 Tacoma 2.4L
1966 GTO 6.5L
2015 Cub Cadet
Honda CT70 (X6)
Re: Pushrod engines; hydraulic lifters and valve lash settings [Re: Seventh] #4494033
08/20/17 09:19 PM
08/20/17 09:19 PM
Joined: Dec 2006
Posts: 1,701
NY, NY
NYEngineer Offline
NYEngineer  Offline
Joined: Dec 2006
Posts: 1,701
NY, NY
Small Chevys always got 3/4 turn.

Re: Pushrod engines; hydraulic lifters and valve lash settings [Re: NYEngineer] #4494068
08/20/17 10:24 PM
08/20/17 10:24 PM
Joined: Dec 2013
Posts: 3,686
Massachusetts
turtlevette Offline
turtlevette  Offline
Joined: Dec 2013
Posts: 3,686
Massachusetts
I've always done 3/4 turn. I'd like to try zero lashing to see if I can get it to rev higher.


USA-1
Re: Pushrod engines; hydraulic lifters and valve lash settings [Re: NYEngineer] #4496067
08/23/17 11:59 AM
08/23/17 11:59 AM
Joined: Dec 2009
Posts: 653
Wash, DC
circuitsmith Offline
circuitsmith  Offline
Joined: Dec 2009
Posts: 653
Wash, DC
Originally Posted By: NYEngineer
Small Chevys always got 3/4 turn.


That's what the 6 cyl in my '76 Nova called for.


2017 Hyundai Tucson SE FWD, 5000mi/12mo OCI
Re: Pushrod engines; hydraulic lifters and valve lash settings [Re: circuitsmith] #4496280
08/23/17 05:11 PM
08/23/17 05:11 PM
Joined: Dec 2006
Posts: 1,701
NY, NY
NYEngineer Offline
NYEngineer  Offline
Joined: Dec 2006
Posts: 1,701
NY, NY
Probably the same lifters.

Re: Pushrod engines; hydraulic lifters and valve lash settings [Re: NYEngineer] #4496534
08/23/17 10:26 PM
08/23/17 10:26 PM
Joined: Dec 2002
Posts: 40,894
'Stralia
Shannow Online content
Shannow  Online Content
Joined: Dec 2002
Posts: 40,894
'Stralia
Originally Posted By: NYEngineer
Probably the same lifters.


Holden 6 was too...


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