Question about Cars & Trucks
How hard to replace? I know they are what they call rolling lifters. Help?
You should be a Mechanic to fix. it,s not that heard.just remove valve cover.
Posted on Feb 15, 2012
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Posted on Jan 02, 2017
Lifters on your engine are non-adjustable. If noise is not loud or is intermittent, sometimes just changing oil and using an additive like marvel oil will clean it up.If noise persists, check pivot contact points on "bridge" that connects each pair of rocker arms together for wear.Replace if worn. disable the ignition system and have someone crank engine over. Observe that all rockers are going up and down the same distance. The ones to check are the ones that are not. If all is ok there, you must go deeper into engine and check lifters for end wear. If you find wear, lifter and camshaft must be replaced Sometimes if the ends are still in good condition, the lifter itself may have an internal problem.If that is the case, replace the lifter.
Before you begin, check oil pressure. A pressure of 15lbs or less is not acceptable.(warmed up, at idle) Pressure must be substantially higher both cold and hot. I recommend at least 30psi at idle hot, 40psi while driving. Lower pressures indicate serious wear on internal bearing surfaces. Replacing the oil pump may temporarily hide this problem but will not cure it!!!
Posted on Dec 31, 2008
red: there were two engines used in the1999 frontier.
The VG30 (V-6 )and the KA24DE (4- CYL)
If you have a V-6, there is no adjustment you can make on the valve clearances. They are hydraulic and self adjust. If they are noisy, you might try changing the oil and filter and using an oil additive designed for addressing high mileage motors with noisy lifters. Marvel Mystery oil actually works, but follow the instructions. MORE IS NOT BETTER!
The 4 Cly engine does not have adjustable valve clearances from the stand point of using a few wrenches, one to adjust and the other to lock the adjuster when the clearance is correct.
These valve clearances are set using shims which are "metal discs about the size of a quarter. They come in various thicknesses and based on the measurement between the base of the cam when the highest point of the lobe is facing the 12:00 position, you place a feeler gauge between the base of the cam and the top of the shim.
If it is too loose or too tight, you use your feeler gauges to find out what it would take to make a zero clearance situation. From there, you remove the shim, measure it. Based on your findings during your initial measurements, you can calculate whether you need to use a thicker or thinner shim.
So to answer your question: unless you have a lifter confused with some other component, there is no means of torquing a lifter down on either series engine which came in that truck.
Please let me know if I can help you further. There must be some reason why you have asked this question......?
Posted on Apr 16, 2009
what do you mean with 'bad valve cover' ?I asume it is leaking oil.it means that the rubber seal is not sealing anymore,it has gone hard.tighten the cover bolts sometimes seals it for a while.to get to the rubber seals the inlet manifold has to be unbolted and moved,a fairly involved procedure but easy to do if you have a manual and standard handtools.The misfiring is likely stray arching of the coils .remove the top plastic cover of the motor andlook when it is very dark [like lightsof in your garage] and look for sparking.If so ,replace sparkplugs or/and leads.[remove inlet manifold also]Tapping lifter,works with oil,try engine oil flush and/or change oil brande.if problem persist replace lifter,lifter undervalve cover
Posted on Jun 08, 2009
Crank the engine until the mark on the damper aligns with the TDC mark on the timing tab and the engine is in #1 firing position.
To adjust a valve back off the adjusting nut until lash is felt at the pushrod. Tighten the nut until all lash is removed. This can be determined by rotating the pushrods with your fngers. When all lash is removed the pushrod will stop rotating. When all play is removed rotate the nut one full turn.
With the engine in #1 firing position the following valves can be adjusted:
Crank engine one full revolution - The following valves can now be adjusted:
Posted on Jul 25, 2009
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