AndrewVanis

Why all the different head gasket sequences? ( And more importantly, which one to use?)

Check out these different ones for a 2004 EJ25 SOHC non-turbo



I labeled them 2004 A, 2004 B, 2004 C (screen shots attached below)



Look at 2004 B – It has a total of only 90 deg after backing off 306deg. How can that at all be tight enough? Seems like a step is missing.



I’m working on a project that is not vehicle specific. Seems like all EJ25 SOHC heads non-turbo should be the same.



Thoughts?



****2004-A



2) Tighten the cylinder head bolts.

(1) Apply a coat of engine oil to washers and

bolt threads.

(2) Tighten all bolts to 29 N·m (3.0 kgf-m, 22 ftlb)

in alphabetical sequence.

Then tighten all bolts to 69 N·m (7.0 kgf-m, 51 ftlb)

in alphabetical sequence.

(3)

Back off all bolts by 180° in reverse order of

installation, and back them off again by 180°.

(4) Tighten all bolts to 42 N·m (3.9 kgf-m, 31 ftlb)

in alphabetical sequence.

(5)

Tighten all bolts by 80° — 90° in alphabetical

sequence.



(6)

Tighten all bolts by 40° — 45° in alphabetical

sequence.

NOTE:

Do not tighten the bolts more than 45°.

(7) Further tighten bolts (a) and (b) by 40° —

45°.

NOTE:

Ensure the total “re-tightening angle” in the [former

two steps], do not exceed 90°.



****2004-B

of cylinder block and cylinder head.

2) Tighten the cylinder head bolts.

(1) Apply a coat of engine oil to the washers and

bolt threads.

(2) Tighten all bolts to 29 N·m (3.0 kgf-m, 22 ftlb)

In alphabetical sequence.

(3)

Tighten all bolts to 69 N·m (7.0 kgf-m, 51 ftlb)

In alphabetical sequence.

(4)

Back off all bolts in reverse order of assembly

By 180°first; back them off by 180°again.

(5)

Tighten again all bolts 40° — 45° in alphabetical

sequence.

CAUTION:

Do not tighten bolts more than 45°.



(6) Tighten again the bolts (a) and (b) to 40° —

45°.

CAUTION:

Do not tighten bolts more than 90° in total angle.



****2004-C



2) Tighten the cylinder head bolts.

(1) Apply a coat of engine oil to the washers and

bolt threads.

(2) Tighten all bolts to 29 N·m (3.0 kgf-m, 22 ftlb)

In alphabetical sequence.

Then tighten all bolts to 69 N·m (7.0 kgf-m, 51 ftlb)

In alphabetical sequence.

(3)

Back off all bolts in reverse order of assembly

By 180° first; back them off by 180°again.

(4)

Tighten the bolts (a) and (b) to 34 N·m (3.5

kgf-m, 25 ft-lb).

(5) Tighten bolts (c), (d), (e) and (f) to 15 N·m

(1.5 kgf-m, 11 ft-lb).

(6) Tighten all bolts by 80 to 90° in alphabetical

sequence.

CAUTION:

Do not tighten bolts more than 90°.

(7) Further tighten all bolts by 80 to 90° in alphabetical

Sequence shown in figure below.

CAUTION:

Ensure that the total “re-tightening angle” [in

the former two steps], do not exceed 180°.




2004 A

2004 B

2004 C

AndrewVanis

What is that last reply about? Is it spam?
(Spam deleted by admin, thank you)

Looking forward to replies so I know how to proceed. Thank you.