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#4603061 - 12/13/17 11:44 PM Hydraulic lifters adjustment ???
Superflan Offline


Registered: 04/28/15
Posts: 357
Loc: Reunion Island
Hi,

Itís my understanding that valvetrain with hydraulic lifters shouldnít need any adjustment regarding valve lash.

But I regularly stumble upon some workshop manuals for those engines that describe some valve lash adjustment procedure.

Whatís the deal? I think Iím lost.
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#4603065 - 12/13/17 11:50 PM Re: Hydraulic lifters adjustment ??? [Re: Superflan]
Blkstanger Offline


Registered: 08/13/11
Posts: 1948
Loc: Lakeside, CA
It's there for engine assembly.
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#4603069 - 12/13/17 11:59 PM Re: Hydraulic lifters adjustment ??? [Re: Superflan]
Silk Online   content


Registered: 07/26/03
Posts: 4557
Loc: New Zealand
Up to the '70's there was an adjustment to put the lifter in the centre of it's travel. Later engines it was fixed...any work on valves and seats could take them out of the window.
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#4603073 - 12/14/17 12:05 AM Re: Hydraulic lifters adjustment ??? [Re: Superflan]
Alex_V Offline


Registered: 04/10/16
Posts: 1155
Loc: Campbellsville, KY
It depends on the engine. They don't require it nearly as often as solid lifter designs, but some still need it periodically. Older Chevy engines, for example.
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#4603279 - 12/14/17 09:05 AM Re: Hydraulic lifters adjustment ??? [Re: Superflan]
Scdevon Offline


Registered: 09/07/09
Posts: 325
Loc: Rockies
Hydraulic lifters need to be preloaded a little bit when initially set up. With hydraulic lash adjusters in an overhead cam set up, the preload is accomplished by the cam / roller follower / valve stem geometry and some lash adjusters are adjustable through the small oil hole.

In a typical American V8 "Small Block Chevy" type engine, on initial assembly you would crank down on the rocker arm nut while spinning the pushrod with your fingers until you can't spin the pushrod anymore and tighten the rocker arm nut another 3/4 turn and you're done.

Other American engines like Fords use a positive stop shoulder on the rocker arm pedestal that usually equals the proper preload when fully tightened. Various lengths of pushrods were available in case you ended up with too much or too little preload due to cylinder head resurfacing, etc but it usually isn't an issue with positive stop rockers.
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#4603428 - 12/14/17 11:23 AM Re: Hydraulic lifters adjustment ??? [Re: Superflan]
ARCOgraphite Offline


Registered: 05/17/09
Posts: 11965
Loc: N.H, U.S.A.
I only preloaded 1/4- 1/3 turn on my fairy cammed street SBC, Is this wrong?
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#4603462 - 12/14/17 11:51 AM Re: Hydraulic lifters adjustment ??? [Re: Superflan]
Srt20 Offline


Registered: 07/14/14
Posts: 494
Loc: Wisconsin
On my race engines I adjusted them so I could just turn the pushrod with 2 fingers. Or just so the ticking stops if doing it while running. Definately more power that way, but probably have to adjust them more often.
I might go slightly tighter on a street engine, unless it was a sunday driver only type. Low miles per year.

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#4603470 - 12/14/17 11:59 AM Re: Hydraulic lifters adjustment ??? [Re: ARCOgraphite]
Scdevon Offline


Registered: 09/07/09
Posts: 325
Loc: Rockies
Originally Posted By: ARCOgraphite
I only preloaded 1/4- 1/3 turn on my fairy cammed street SBC, Is this wrong?



As long as the lifter has enough preload that there is zero valve clearance "slack" at any time, they should be fine. 1/4 turn is a little on the light side and it won't allow the lifter to take up much wear in the rocker arms and pushrods like 1/2+ turn would.

You can adjust them while running if you tighten the rocker arm nut until the lifter stops clacking and go another 1/2 turn (or whatever) from there, but the factory never did it this way and it's messy and time consuming and unnecessary.
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2003 Mustang Mach 1. 32V 4.6 Liter. Motorcraft Syn Blend 5W30
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#4603823 - 12/14/17 07:39 PM Re: Hydraulic lifters adjustment ??? [Re: ARCOgraphite]
Alex_V Offline


Registered: 04/10/16
Posts: 1155
Loc: Campbellsville, KY
Originally Posted By: ARCOgraphite
I only preloaded 1/4- 1/3 turn on my fairy cammed street SBC, Is this wrong?



After putting a new, smoother cam in my Suburban's 350 (some dummy put a 3/4 cam in an otherwise stock smog-era engine) I found differing numbers, from 1/4 to 3/4 or maybe even a whole turn. IIRC I set mine to 1/4 and 4 or 5,000 miles later the valve train is perfectly quiet.
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I like Chevy and Valvoline.

'13 Cruze, 1.4T, 112K
'85 GMC C3500, 454, 130K
'82 Mercedes 300CD, OM617 turbo, 167K
'67 Suburban, 350, 331K

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#4604056 - 12/15/17 01:40 AM Re: Hydraulic lifters adjustment ??? [Re: Superflan]
Superflan Offline


Registered: 04/28/15
Posts: 357
Loc: Reunion Island
I think Iím lost. Any thoughts about Euro 4cyl engines?


Edited by Superflan (12/15/17 01:41 AM)
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#4604065 - 12/15/17 02:32 AM Re: Hydraulic lifters adjustment ??? [Re: Superflan]
Silk Online   content


Registered: 07/26/03
Posts: 4557
Loc: New Zealand
I've never seen any adjustment on hydraulic lifters or lash adjusters on an ohc engine.
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#4604184 - 12/15/17 08:11 AM Re: Hydraulic lifters adjustment ??? [Re: Silk]
Scdevon Offline


Registered: 09/07/09
Posts: 325
Loc: Rockies
Originally Posted By: Silk
I've never seen any adjustment on hydraulic lifters or lash adjusters on an ohc engine.


This type of OHC lash adjuster (Ford) is adjustable with an allen wrench and they can be adjusted in place through the hole in the cam follower with everything assembled. This is something that hardly ever needs adjusting, though. If you have preload issues on an OHC engine that is anywhere close to stock, you have other more serious issues. The "sweet spot" on OHC lash adjusters is pretty forgiving with a big window of error engineered into them.



(Images borrowed from the internet)
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2003 Mustang Mach 1. 32V 4.6 Liter. Motorcraft Syn Blend 5W30
1970 Mustang Convertible 302-2V Auto (Stock) M/C 10W30
1970 VW Beetle 1600 DP

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#4604271 - 12/15/17 09:24 AM Re: Hydraulic lifters adjustment ??? [Re: Superflan]
ARCOgraphite Offline


Registered: 05/17/09
Posts: 11965
Loc: N.H, U.S.A.
Ive seen Class-3 lever finger followers with stationary lash adjusters on mainly SOHC but I see Subaru uses this on FB engine now - last time I saw a cutaway.


Edited by ARCOgraphite (12/15/17 09:28 AM)
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#4604690 - 12/15/17 04:25 PM Re: Hydraulic lifters adjustment ??? [Re: Scdevon]
Silk Online   content


Registered: 07/26/03
Posts: 4557
Loc: New Zealand
Originally Posted By: Scdevon

This type of OHC lash adjuster (Ford) is adjustable with an allen wrench and they can be adjusted in place through the hole in the cam follower with everything assembled.


I knew someone would come up with something. I've never seen one of thoses, or if I have I have never had to adjust them. I don't like the term ''preload'' when setting hydraulic lifters, there is no preload, you are just putting it close to the centre of it's movement, to preload it you would be going beyond it's range.
_________________________
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.

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#4605750 - 12/16/17 06:59 PM Re: Hydraulic lifters adjustment ??? [Re: Silk]
Scdevon Offline


Registered: 09/07/09
Posts: 325
Loc: Rockies
Originally Posted By: Silk


I don't like the term ''preload'' when setting hydraulic lifters, there is no preload, you are just putting it close to the centre of it's movement, to preload it you would be going beyond it's range.


Well, you are depressing a spring and plunger in the valve lifter by tightening the rocker arm nut so preload somewhat fits. Preload doesn't necessarily mean overloaded or out of range.

It's just my visual observation that an additional 1/2 turn on the rocker arm nut doesn't place the lifter plunger anywhere near the center of it's movement. 10% depressed off of it's upper stop maybe at the most.
_________________________
2003 Mustang Mach 1. 32V 4.6 Liter. Motorcraft Syn Blend 5W30
1970 Mustang Convertible 302-2V Auto (Stock) M/C 10W30
1970 VW Beetle 1600 DP

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