nasty knock

90runnner · 07-03-2005, 09:13 AM

3.0L making a knock from the top left side(facing truck). ran amsoil flush and the knock wasnt as loud but still there, hydrolic lifter possibly?... any suggestions before i pull off the intake manifold so i can get to the valve cover to check

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94x4 · 07-03-2005, 09:53 AM

Are you sure that it is coming from the "top" on the passenger ["left side(facing truck)"] side? As this is a common occurrence for the bottom driver's side, i.e., rod bearing.
If so, then I would have to say that it is the lifter and it needs to be reshimmed and/or tightened, both of which you can "search" here for info on.

90runnner · 07-03-2005, 12:46 PM

yeah, im possitive its coming form up there, thanks for the advice

Bigblock · 07-03-2005, 07:25 PM

they aint no hydraulic lifter in no 3.0!

94x4 · 07-03-2005, 09:19 PM

Nah, there's not. But if you point in the right direction, they can usually sort it out for themselves, 3yotys.

90runnner · 07-04-2005, 02:52 PM

you sure there arent hydraulic lifters? when i was trying to figure it out before i came here i was told it could be a collapsed hydraulic lifter...by a friend who happens to be a mechanic at a local toyota dealership

94x4 · 07-05-2005, 11:36 AM

The valve lifter, or hydraulic lifter (although it's operation is purely mechanical), or even camshaft follower, is basically a little cup that sits atop the valve, with a shim of varying thicknesses on top of it that acts as a spacer for the cam's lobe to ride on.

Normally the lifter itself does'nt "collapse", instead, the shim becomes worn and needs to be replaced with a new one of proper thickness, which is determined with a feeler gauge and some plasti-guage.

It is also common for a spring to have "collapsed" or broken, but your problem is probally just that the shims need to be adjusted, a "scheduled maintenance" item suggested to be performed every 60,000 mis.,
or every 2 yrs., whichever comes first, which will definitely cause a "loud knocking" at the top of your engine.

Just a little clarification to avoid confusion, so ask your "mechanic...friend" about this and let's know what he comes up with.

90runnner · 07-05-2005, 03:37 PM

alright, thanks alot man

94x4 · 07-05-2005, 03:53 PM

No prob, and good luck with what you find out.

Reshimming is the easiest and cheapest route, something you can do yourself, whereas a valve job would start to get a bit more involved and costly as it is common practice to do them all if you have to do one... so best wishes.

07-03-2005, 12:46 PM	#3 (permalink)
90runnner Registered User Join Date: Jul 2005 Location: Newport News, VA Posts: 366	yeah, im possitive its coming form up there, thanks for the advice __________________ <===i miss that one Mine: 1991 Landcruiser 2in OME lift 33in BFG A/T's The girl's: 2001 4runner 3in Revtek, 3in body lift 35in MT Baja Claws Marlin sliders TJM front bumper

07-04-2005, 02:52 PM	#6 (permalink)
90runnner Registered User Join Date: Jul 2005 Location: Newport News, VA Posts: 366	you sure there arent hydraulic lifters? when i was trying to figure it out before i came here i was told it could be a collapsed hydraulic lifter...by a friend who happens to be a mechanic at a local toyota dealership __________________ <===i miss that one Mine: 1991 Landcruiser 2in OME lift 33in BFG A/T's The girl's: 2001 4runner 3in Revtek, 3in body lift 35in MT Baja Claws Marlin sliders TJM front bumper Last edited by 90runnner; 07-04-2005 at 02:56 PM.

07-05-2005, 11:36 AM	#7 (permalink)
94x4 Guest Join Date: Jun 2005 Posts: 1,429	The valve lifter, or hydraulic lifter (although it's operation is purely mechanical), or even camshaft follower, is basically a little cup that sits atop the valve, with a shim of varying thicknesses on top of it that acts as a spacer for the cam's lobe to ride on. Normally the lifter itself does'nt "collapse", instead, the shim becomes worn and needs to be replaced with a new one of proper thickness, which is determined with a feeler gauge and some plasti-guage. It is also common for a spring to have "collapsed" or broken, but your problem is probally just that the shims need to be adjusted, a "scheduled maintenance" item suggested to be performed every 60,000 mis., or every 2 yrs., whichever comes first, which will definitely cause a "loud knocking" at the top of your engine. Just a little clarification to avoid confusion, so ask your "mechanic...friend" about this and let's know what he comes up with. Last edited by 94x4; 07-05-2005 at 11:42 AM.

07-05-2005, 03:37 PM	#8 (permalink)
90runnner Registered User Join Date: Jul 2005 Location: Newport News, VA Posts: 366	alright, thanks alot man __________________ <===i miss that one Mine: 1991 Landcruiser 2in OME lift 33in BFG A/T's The girl's: 2001 4runner 3in Revtek, 3in body lift 35in MT Baja Claws Marlin sliders TJM front bumper

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07-03-2005, 09:53 AM	#2 (permalink)
94x4 Guest Join Date: Jun 2005 Posts: 1,429	Are you sure that it is coming from the "top" on the passenger ["left side(facing truck)"] side? As this is a common occurrence for the bottom driver's side, i.e., rod bearing. If so, then I would have to say that it is the lifter and it needs to be reshimmed and/or tightened, both of which you can "search" here for info on.

07-03-2005, 07:25 PM	#4 (permalink)
Bigblock Registered User Join Date: Dec 2004 Location: Taylorshole,Mississippi Posts: 913	they aint no hydraulic lifter in no 3.0!

07-03-2005, 09:19 PM	#5 (permalink)
94x4 Guest Join Date: Jun 2005 Posts: 1,429	Nah, there's not. But if you point in the right direction, they can usually sort it out for themselves, 3yotys.

07-05-2005, 03:53 PM	#9 (permalink)
94x4 Guest Join Date: Jun 2005 Posts: 1,429	No prob, and good luck with what you find out. Reshimming is the easiest and cheapest route, something you can do yourself, whereas a valve job would start to get a bit more involved and costly as it is common practice to do them all if you have to do one... so best wishes.

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