Whats the difference with more or less lifter preload?
#5
Have either of you noticed your Morels to be excessively noisy or prone to bleed down when left to sit for,say,a week or so ? Mild cam,.605 lift,and adj Jesel rockers,still seems noisier than it should be esp cold. BTW,this is my second set,first ones had a couple collapse(less than 500 miles)
#6
TECH Fanatic
iTrader: (1)
Lifter pre-load is the distance between the retaining snap ring and the push rod seat in the lifter when the lifter is on the heel of the cam lobe with the valve closed. A number of things can affect lifter pre-load:
1.Resurfacing the heads and/or block deck
2.Changes in camshaft diameter
3.Changes in push rod length
4.Changes in valve length
5.Changes in rocker arm length or geometry
6.Changes in head gasket thickness
7.Changes in lifter height
8.Valve job
9.Different rocker arm stands or shafts
Be sure and check the valve geometry and use either longer or shorter push rods to correct the geometry.
In some cases a shim under the rocker shaft may be required to maintain correct geometry.
When installing new hydraulic lifters, follow the proper OEM procedures for checking and
adjusting lifter pre-load.
hope it helps
1.Resurfacing the heads and/or block deck
2.Changes in camshaft diameter
3.Changes in push rod length
4.Changes in valve length
5.Changes in rocker arm length or geometry
6.Changes in head gasket thickness
7.Changes in lifter height
8.Valve job
9.Different rocker arm stands or shafts
Be sure and check the valve geometry and use either longer or shorter push rods to correct the geometry.
In some cases a shim under the rocker shaft may be required to maintain correct geometry.
When installing new hydraulic lifters, follow the proper OEM procedures for checking and
adjusting lifter pre-load.
hope it helps
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#8
TECH Senior Member
iTrader: (4)
Have either of you noticed your Morels to be excessively noisy or prone to bleed down when left to sit for,say,a week or so ? Mild cam,.605 lift,and adj Jesel rockers,still seems noisier than it should be esp cold. BTW,this is my second set,first ones had a couple collapse(less than 500 miles)