Question about 1991 Honda Prelude
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Posted on Jan 02, 2017
SOURCE: torque settings
Posted on Aug 06, 2008
SOURCE: cylinder head bolt torque
Torque all headbolts to 29 ft lbs with a good and accurate torque wrench, then tighten them further in two steps 90 Degrees per step. But if you've replaced the head bolts with new ones tighten them and additional 90 Degrees.
Posted on Aug 20, 2009
SOURCE: I have a 1998 Holden
I cannot find a EL20B in my data,but all Astra listed had the same head sequence as shown:
10 6 2 3 7
9 5 1 4 8
the torque specs for the C20XE,C20NE,X20XEV were all
25nm(18lb/ft),-then 90 deg,-90deg,-90deg.
Z20LET were as above plus an additional 15deg.
Same data for smaller and larger engines(except a couple that were 45deg instead of 15)
Make sure that you replace the head bolts with new,they are torque to yield bolts that are designed to stretch to 'plastic' state,and should not be reused.
Put grease(graphite if you have it) under bolt heads and washers,oil the threads.
Usually the head sets come with the torque specs.
I hope this helps you.
Posted on Apr 02, 2011
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Hello, you will start from middle head bolts and work out to end bolts. Use a crisscross pattern. Set all bolts at 20 ft pounds then repeat to a final setting of 51 -54 ft pounds. Just be sure you do an "x" patern from middle bolts working out. Also be sure you coat th threads of each headbolt with some oil so they torque smooth and accurate.
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