cylinder head assembly

[renfox]

mga boss, any idea po kung paano proper na pagbalik ng cylinder head..kung may procedure po para safety salamat po..


tia..

[afrasay]

safety?...hmmm. just be sure you don't drop it on your foot :D

Yun mechanic ko uses gasket sealer though I think kahit wala nito ok lang. Tighten to the specified torque setting na nasa shop manual. Cross pattern (up-down, left-right, etc.). Be sure you tighten the bolts almost the the same time, unti-unti. Eto lang alam ko. Wait natin reply ng mga experts.

[t2erns]

sure me mga procedures yan to follow, your best guide is a service manual for that particular vehicle

[renfox]

salamat po mga sir,
*t2erns
san po kaya pwede mag downlod para sa service manual?

[yebo]

proper cylinder head bolts tightening sequence for a 4 cylinder engine is...

8..4...1..5...9
( ) ( ) ( ) ( )
7..3..2...6..10

torque first to 10% of required torque in sequence 1-2-3-4-5-6-7-8-9-10 then torque it to the final torque, also in the same sequence. do the final torquing twice. so if you will notice parang pa-ikot ang bolt tightening sequence starting from the middle then going out. the reason why the center bolts are torqued first is to spread out the head. if you start from one side then the head will tend to twist.

pwede din yung sabi ni afrasay na unti-unti ang torque setting. so instead na 10%-100%-100% you can do it in several steps like 10%-30%-50%-100%-100% of bolt torque. just make sure you do the 100% twice.

for a 6-cylinder it will be ...

12..8...4...1..5...9..13
..( ) ( ) ( ) ( ) ( ) ( )
11..7..3...2...6..10..14

[afrasay]

ayun mas malinaw yun kay yebo ;)

[t2erns]

good points from sir yebo, to add there are those with torque to yield bolts that need head bolts replacements, there are also specified torque and procedure ; thus you need a service manual as your guide. depending on type of engine, you may find some in the internet.

chek this site
http://www.aera.org/docs/other/Torque3.pdf