Lifter tapping/knocking with brand new ls7 lifters???
#1
Lifter tapping/knocking with brand new ls7 lifters???
Just did a cam swap and a buddies 03 5.3L
ew ls7 lifters and ls2 trays pushrods springs..........everything else for a swap
He has yella terra rockers as well with the cam
The instructions for the lifter say set cylinder 1 to top dead center and hand tighten the rocker bolts evenly making sure the push rods still spin slightly.
Did that^
Next it says to turn each rocker bolt 90 degrees and repeat, but make sure they don't turn past 360 degrees which wasn't possible to do for us.
Next tq all other rocker arm bolts to 22ftlbs
Any ideas why he is having lifter tapping/knocking?
ew ls7 lifters and ls2 trays pushrods springs..........everything else for a swap
He has yella terra rockers as well with the cam
The instructions for the lifter say set cylinder 1 to top dead center and hand tighten the rocker bolts evenly making sure the push rods still spin slightly.
Did that^
Next it says to turn each rocker bolt 90 degrees and repeat, but make sure they don't turn past 360 degrees which wasn't possible to do for us.
Next tq all other rocker arm bolts to 22ftlbs
Any ideas why he is having lifter tapping/knocking?
#4
we soaked them over night in oil.
The Ls7 lifters said direct replacement, butttt I know the seat is .05 taller than stock lifters < this is confusing
It just the number one cylinder tapping
The Ls7 lifters said direct replacement, butttt I know the seat is .05 taller than stock lifters < this is confusing
It just the number one cylinder tapping
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#8
TECH Senior Member
iTrader: (59)
Mine tap pretty loudly, especially when cruising, sounds like a diesel. Everything is new and my preload is around 0.075". My cam lift is only 0.561" and my springs aren't that heavy. Part of the game I guess.
But as mentioned measure for preload. I needed 0.050" shorted pushrods when switching to LS7 lifters to achieve the same preload.
But as mentioned measure for preload. I needed 0.050" shorted pushrods when switching to LS7 lifters to achieve the same preload.
#10
TECH Fanatic
iTrader: (12)
I think its pretty hard to eliminate lifter tap in the LS engines. Mine has very slight tap and can only be heard when my engine is at operation temp. I've seen some big money, big name engines have some pretty noisy lifter tap when cold or hot. Makes me glad I did mine right and triple checked everything.