Thread: Hydraulic lifters
12-21-2011, 09:53 AM #1
When assembling the rocker arms on a four tech, do you need to prime the lifters? If so how?
12-21-2011, 12:01 PM #2
12-21-2011, 01:22 PM #3
Thought not. Just wondering how the engine will run with the valves not opening to begin with. I've also got two sets of the intake rockers that the lifters are stuck in the out position. I cant push them in, is this common? And what would cause it? Anyone got a couple for sale?
12-21-2011, 11:32 PM #4
Check the classifieds make sure you replace the rocker bolts when you re-install
01-04-2012, 10:40 AM #5
01-04-2012, 10:41 AM #6
"Priming" 4-Tec Oil System
After Winterization, or whenever the unit sits for over a month, I always turn the engine over the first time @ WOT and hold it there.
Now, before anyone goes ballistic and shoots back a fast one --- the 4-Tec engine will not allow the Fuel Injectors to Inject when the Start Button is Pressed with the Throttle FULLY depressed---it just turns over which of course will run your Oil Pump and Oil Separator to "pre-lube" the engine and increase the Oil Pressure to the Lifters.
You can release the Throttle immediately after the engine Starts Turning over and continue to press the Start Button for 7~10 seconds --- it won't start....
Do this a few times with a little time in between to give the Starter Motor
a rest and you should have no worries.
01-04-2012, 10:43 AM #7
you dont need to "prime" them, but may need to bleed them.
01-04-2012, 07:36 PM #8
03-18-2012, 12:43 AM #9
03-18-2012, 08:44 AM #10
- Join Date
- Sep 2009
What he means is that the lifters can "pump up" with oil.
Lifters are designed to expand under oil pressure. Think of them as a miniature piston assembly. The lifter expands with a certain amount of pressure, enough to take up the gap so there is no lash, or slop. between the lifter and the valve stem. When the cam opens the valve, the lifter has check valves to keep most of the oil from escaping, and you cannot compress a liquid, so the lifter acts as a solid lifter.
However, they build the lifter to that it slowly bleeds off the oil when it is under pressure greater than the pressure of the oil filling it. This is to prevent damage if the lifter has an oil charge greater than the amount needed to make it rigid during valve opening. When you first crank down the rocker arms after the engine has been apart, you will notice that the rocker assembly will open up the valves. If you cranked down the rockers and immediately started the engine, you might bend valves. Once you install it, it takes some time for the lifters to bleed down to the point that they just fill the lash properly.
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