Tapet Adjustment.

[ZD44TT]

Hi guys...........can someone run me through the process of making an ajustment.......seems to be getting abit noisey these days .......or was before and I didn't realise.........tapping sound near the cylinder nearest to the radiator.

 

 

[JP240z]

they have nuts to lock them in place from memory

 

[Rod F]

You'll need two spanners, I can't remember the exact sizes. One is to loosen the lock nut, while the other adjusts the height (and hence the tapet clearance). If you're adjusting while hot, work quickly, otherwise wait overnight and adjust to cold clearances.

Loosen the lock nut, stick your gauge in and adjust until you're happy    I find the clearance shifts slightly when tightening the lock nut, so keep this in mind.

Also, if you're rocker cover gasket is a bit second-hand, maybe replace it at the same time.

 

Hope this helps.

[ZD44TT]

by gauge I take it you mean those thin metal slips with varying thickness right? if so what thickness should i go for?

 

or am I way off here.

 

You'll need two spanners, I can't remember the exact sizes. One is to loosen the lock nut, while the other adjusts the height (and hence the tapet clearance). If you're adjusting while hot, work quickly, otherwise wait overnight and adjust to cold clearances.

Loosen the lock nut, stick your gauge in and adjust until you're happy    I find the clearance shifts slightly when tightening the lock nut, so keep this in mind.

Also, if you're rocker cover gasket is a bit second-hand, maybe replace it at the same time.

 

Hope this helps.

[JP240z]

feeler gauges is what they're called,

you will need 0.018 mm on the intake, and 0.025 on the exhaust from memory, but dont quote me, refer to your manual, it has all the info there.

[sco_aus]

if you dont have a manual, let me know Will.  But I wont be able to read it till next weekend

[Rod F]

I've got a manual at home, do you have an L24, L26 or an L28 motor?

[sco_aus]

L28

[ZD44TT]

I've got a manual at home, do you have an L24, L26 or an L28 motor?

 

I've got a L26 actually...........thanks for the help guys.........hahahha didn't know they were called feeler gauges...........funny.

[sco_aus]

haha, i could have sworn you told me L28   my bad

[ZD44TT]

haha, i could have sworn you told me L28    my bad

 

that I may have...........hehehhe oops.

 

hmmm.........i'll check tmrw.

[sco_aus]

hahahahaha, nice

[nat0_240_chevZ]

ok, to clear things up

 

rocker arm to cam clearances are 0.18 (not 0,018) intake and 0.25 (not 0,025)mm for exhaust.

 

yes they are called feeler or slip gauges.

 

best to set when hot (unfortunately as cold is easier but heat changes you clearances dramatically)

ther is a hot and cold clearance!!!!

 

clearances are the same for l24,26,28,30 & 31 for the stroker boys.

 

heres some interesting info however, if you set them higher than spec ie .25 &.35 it shifts peak tourque up the rev range, and lower than spec (not realy recommended as if you go too close will cause pre-matue wear / failure of rocker lash & cam lobe) shifts tourge down a bit lower in the rpm range.

 

Yes, the clearance changes as you tighten the locknut, (becomes less) so be aware of it and you will work out that you must check after you are all tourqed up. each one tightens up differently so keep an eye on it.

 

i belive from memory the spanner sizes are 14mm & 17mm?? or 15mm & 17mm bit vauge on this as it has been a very long time since i even had an l-series motor let alone done a valve clearance check.

 

valve clearance is deducted of your cam lift before multiplying by your rocker arm ratio.

ie (cam lift = 10.5mm - 0.18mm(clearance)) x 1.2 (rocker arm ratio)= actual lift @ the valve

 

just thought id let you boys in on a bit of wealth, as sounded like you were all struggling!!!

 

nato

[JP240z]

sorry, it was a while ago, but i was close.

[ZD44TT]

awesome thanks heaps Nat.