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Old 12-01-2009, 05:05 PM   #1 (permalink)
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Default Subaru 2.5 SOHC Cylinder Head Bolt Tightening Sequence

Following is elaborate bolt tightening sequence for Forester 2.5L SOHC cylinder head. Is this what all DIY'rs are using?

2) Tighten cylinder head bolts.
(1) Apply a coat of engine oil to washers and bolt threads.
NOTE:
Bolts with pink marks on their bolts heads must be
used for (c) through (f).
(2) Tighten all bolts to 29 Nm (3.0 kg-m, 22
ft-lb) in alphabetical sequence.
Then tighten all bolts to 69 Nm (7.0 kg-m, 51
ft-lb) in alphabetical sequence.
(3) Back off all bolts by 180 first; back them off
by 180 again.
(4) Tighten bolts (a) and (b) to 34 Nm (3.5
kg-m, 25 ft-lb).
(5) Tighten bolts (c), (d), (e) and (f) to 15 Nm
(1.5 kg-m, 11 ft-lb).
(6) Tighten all bolts by 80 to 90 in alphabetical
(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.

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Old 12-01-2009, 05:24 PM   #2 (permalink)
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That's what I just used on MY04. Granted, the 03/04 manual WAS different, but I have always used what the RS, Legacy, Outback and 99-02 SOHC's called for, which is exactly what you stated.

Step 3, back off 180 in BACKWARD sequence .... ie f back to a. Then 180 again.

The 2 ODD colored bolts are in the center. I have seen some pink, red, black and green to date. Sometimes the 4 corners are colored, others only the center bolts are.
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Old 12-02-2009, 05:44 PM   #3 (permalink)
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Thanks, I'll post my experience after doing the head gaskets early next year.

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