Testing lifters ?

[ROOKIE1]

Is it possible to test a lifter ? Here is link that got me to this new thread starting . http://dsmtuners.com/forums/showthread.php?t=239475 . They are new with around 750 miles on them and rebuilt engine . The head is from SBR as are the lifters .

 

[talon1987]

I believe to test it you can take a paperclip and insert into the top hole on the lifter and try to collaspe the lifter if it doesnt collaspe then its seized and needs to be replaced.

-Fitz

 

[ROOKIE1]

I know upon installation you do that while cleaning . But these are installed and have been run @750 miles . I have had the valve cover off and turned crank manually to watch movement . They seem to be functioning fine . But when i run the engine I get a ticking/clapping noise under valve cover . I did recheck and everything is torqued to specs . This is a fresh rebuild . Block .20 , wisecos , e16g , stage 2 head from Sbr . The first 700 miles have been quiet , no noise , no smoke - still none . This is a recent development in my 1 year journey .

 

[talon1987]

Are the lifters revised ??

 

[ROOKIE1]

Yes , from SBR .

 

[ROOKIE1]

I do have stock cams in car . Do they go bad ? Could that cause the ticking noise ? What about rockers ? Can I remove all the lifters at once ? I do not want to redo timing , so I do not want to remove cams ? Unless it is needed as a last resort .

 

[ROOKIE1]

Mechanically speaking . Why do you replace cams ? Aside from hp gains , rpm bands , blah blah blah ? Do they wear out ?

 

[talon1987]

Ya over time the cam lobes can go flat but i dont think thats what is causing the ticking ... when you have the car off idle does the ticking go away?? and also here is the vfaq for replacing/cleaning lifters no need to redo timing http://www.vfaq.com/mods/lifters.html

 

[ROOKIE1]

Ya over time the cam lobes can go flat but i dont think thats what is causing the ticking ... when you have the car off idle does the ticking go away?? and also here is the vfaq for replacing/cleaning lifters no need to redo timing http://www.vfaq.com/mods/lifters.html

I know all about the vfaq . . The timing question was referring to the possibilities of replacing the cam shaft . Maybe ticking is not the correct word . I had lifter tick before my rebuild . I do not think there is a way it could be a lifter issue . They are clean , new , revised . There is a noise from valve cover though . Ticking , slapping , clapping , whatever you want to call it . The noise does not go away . The camshaft in question have around 155k on them . The stage 2 head from Sbr has 750 miles on it . Could the new valve springs have just sped up the wearing process on an already old camshaft ? How many miles or what is the life of a camshaft ?

 

[Big Woo]

Are the lifters being pre-loaded the correct amount?

When a head is rebuilt, specifically when a valve grind is preformed. The valve seats and the valve faces are ground or cut. This effectivly raises the valve stem in relation to the cam/rocker/lifter. This means that when the valve seats, and valve faces are cut that a coorisponding amount of material must be removed from the valve stem tip to ensure that the proper amount of lifter preload is maintained.

Too much pre-load (IE not enough material removed from the valve stem tip) can cause the lifter to fail over time. Not enough pre-load (IE too much material removed from the valve stem) can lead to the lifter to not having enough travel to keep the lifter in contact with the rocker/cam/valve stem.

 

[ROOKIE1]

Are the lifters being pre-loaded the correct amount?

When a head is rebuilt, specifically when a valve grind is preformed. The valve seats and the valve faces are ground or cut. This effectivly raises the valve stem in relation to the cam/rocker/lifter. This means that when the valve seats, and valve faces are cut that a coorisponding amount of material must be removed from the valve stem tip to ensure that the proper amount of lifter preload is maintained.

Too much pre-load (IE not enough material removed from the valve stem tip) can cause the lifter to fail over time. Not enough pre-load (IE too much material removed from the valve stem) can lead to the lifter to not having enough travel to keep the lifter in contact with the rocker/cam/valve stem.

As I said the head is a stage 2 from SBR , http://www.slowboyracing.com/more.php?id=1035& , the lifters were purchased there also . So the preload question I have not a clue . I could understand that a worn camshaft could present a gap between rocker and camshaft . I think this would cause a noise under idle or any rpm . I did nothing to the camshaft upon the rebirth of my engine . Kick myself in the ass for that one . The gears and shafts are original , @155k on them . I know they do wear out , but when or how long do they last . Old part on new part equals new problems .

 

[ROOKIE1]

Installed bc 272's today . Can not seem to find timing mark . I need to check cas for alignment . I know marks line up on cam gears and crank . I seem to still get some ticking noise . I checked lifters and they seem fine . I have not replaced the rockers yet . Yet . What idle issues have people had with the bc272's . Anything else to check ?

 

[1gdsmraider]

Oil starving? i run 264's on revised lifters.. no issues w/ stock rockers approx 148k on em, decent shape ticked a little at first, now.. silence

 

[ROOKIE1]

Oil starving? i run 264's on revised lifters.. no issues w/ stock rockers approx 148k on em, decent shape ticked a little at first, now.. silence

I do not think so . Complete rebuilt bottom , new oil pump . Head from Sbr . Only thing not new in top is rockers . I assume rockers wear out also . I have seen a set for $240 . Any suggestions or a better price .

 

[ROOKIE1]

Rechecked and retimed today . . No more tick . I guess my camshafts were worn . Do aftermarket cams require different timing settings ? I am at 8* btdc .