Subaru Engine >> CYLINDER HEAD REMOVAL & INSTALLATION FOR 2.5L SUBARU
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Subaru Engine >> CYLINDER HEAD REMOVAL & INSTALLATION FOR 2.5L SUBARU
Cylinder Head Removal & Installation For
1996-2001 Subaru 2.5L VIN 6 Engines
The AERA Technical Committee offers the following information regarding cylinder head installation for 1996-2001 Subaru 2.5L VIN 6 engines. This information is the result of service manual updates made recently by Subaru. Previously published AERA Technical Bulletin TB 1945 should be discarded and this bulletin referenced while removing and installing cylinder heads for this engine.
To help reduce the likelihood of cylinder head warpage during head removal allow the engine to first cool and then loosen the cylinder head bolts in the sequence shown in Figure 1 below.
To assure an effective cylinder head gasket seal, use the method listed below while observing the alphabetical torque sequence shown in Figure 2.
Cylinder Head Installation
1. Apply a coat of engine oil to washers and bolt threads.
2. Tighten all bolts in sequence as shown in Figure 2 below to 22 ft. lbs (29 Nm or 3.0 kg-m).
3. Then, tighten all bolts in sequence to 51 ft. lbs (69 Nm or 7.0 kg-m).
4. Back off all bolts by 180° in sequence first; and then back them off by 180° again.
5. Tighten bolts 1 & 2 to 25 ft. lbs (34 Nm or 3.5 kg-m).
6. Tighten bolts (3), (4), (5) and (6) to 11 ft. lbs (15 Nm or 1.5 kg-m).
7. Tighten all bolts an additional 80-90°in sequence.
8. CAUTION: Do not tighten bolts more than 90° at this time.
9. Further tighten all bolts by 80-90°in sequence again.
10. CAUTION: Ensure that the total re-tightening angle [in steps 7 and 9] do not exceed a total of 180° rotation
The AERA Technical Committee
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