how do adjust valve clearance of DOHC engines???

**fourtheboys96** · January 18th, 2007 07:33 PM

about to finish my DIY car repair (valve lapping, valve seals, gaskets etc...) corolla gl 91

problema ay yung valve clearance na bago pa man ako nag simula ay mukhang ndi tama so gusto ko siya itama.

kaso unlike the rocker-arm type na may screw for adjustments ng clearance, yung sa kotse ko ay wala. meron siyang adjusting shim ng papalitan mo kung mali ang sukat. pero mukhang mahal ang prosesong ito na suggested ng repair guide. kasi kelangan pa i-measure ang installed shim using a micrometer (wala ako nito at mukhang mahal ito hehehe) then do the computaions tapos bibili ng bagong shim of the right thickness.

any alternative method of doing this??? yung kilala ang ginawa niya dati ay tiniyaga niyang hasain yung shim ng kelangan ng adjustment. but the question is paano kung ang kelangan is mas makapal na shim??? may nabibili ba nito sa atin??? although meron naman akong extra shims sa bahay just in case.

tnx!!!

**m_ron** · January 19th, 2007 08:33 AM

To do it right you need to replace the shims and use a feeler gauge.Make sure na adjust muna ang valve, sayang naman ang pinaghirapan mo kung tumukod ang pistons sa valve.Do you know the clay technique?

**m_ron** · January 19th, 2007 08:38 AM

also forgot to mention Torque wrench.

**afrasay** · January 19th, 2007 01:15 PM

Originally Posted by m_ron

To do it right you need to replace the shims and use a feeler gauge.Make sure na adjust muna ang valve, sayang naman ang pinaghirapan mo kung tumukod ang pistons sa valve.Do you know the clay technique?

just can't resist this, but...is that the technique used by Patrick to Demi in the movie "Ghost" ? :D

**speedyfix** · January 21st, 2007 08:13 PM

you can also just have a competent machine shop set it for you.

**m_ron** · January 22nd, 2007 03:07 AM

Originally Posted by speedyfix

you can also just have a competent machine shop set it for you.

Shims are not available in car stores?

**fourtheboys96** · January 22nd, 2007 04:48 PM

what is the clay method???

na install ko na lahat and yung valve clearance na lang ang itatama ko.

will research the clay method kung applcable.

tnx!!!

**speedyfix** · January 24th, 2007 09:09 AM

they are but since he is doing the build at home he may know of a machine shop that can set it for him para di na nya kelangan pumunta sa mga car shops

**fourtheboys96** · January 24th, 2007 05:10 PM

the clay method pala ay para i measure ang valve to piston clearance which i think and hope is not an issue dun sa makina ko.

anyway, meron naman ako 32 shims sa bahay (16 yung naka install) so tiyagain ko na lang muna ang trial and error hehehe. meaning kabit then sukat then tanggal uli kung mali ang clearance.

yung ndi tatama sa sukat ang ipamachine shop. sana lang alam nila dito sa probinsya.

salamat mga bru!!!