Subaru FA20 Head Bolt Torque Specs and Sequence
Subaru FA20 Head Bolt Torque Specs and Sequence with application boundaries, staged tightening guidance, reuse cautions and official service-information lookup.
For the naturally aspirated BRZ FA20 procedure, oil the six main bolt threads and washers, tighten in order to 20 N·m, then 100 N·m, loosen each 360°, retighten to 20 N·m and 42 N·m, then complete the manual's position-specific angle turns.
For the naturally aspirated BRZ FA20 procedure, oil the six main bolt threads and washers, tighten in order to 20 N·m, then 100 N·m, loosen each 360°, retighten to 20 N·m and 42 N·m, then complete the manual's position-specific angle turns.
The numerical stages apply to the FA20D/4U-GSE BRZ-style engine covered by the linked service manual. Turbo FA20DIT WRX/Forester engines, later FA24 engines and aftermarket studs use different procedures.
Interactive FA20D BRZ Boxer-Four center-out sequence aid
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This balanced pattern is an orientation aid; use the exact numbered manufacturer diagram for assembly.
Subaru Fa20 Head Bolt Torque Specs
| APPLICATION / ITEM | SPECIFICATION | NOTES |
|---|---|---|
| Stage 1 | 20 N·m (14.8 lb-ft) | Oiled threads and washers |
| Stage 2 | 100 N·m (73.8 lb-ft) | Exact six-bolt order |
| Stage 3 | Loosen 360° | Each main bolt in order |
| Stages 4 and 5 | 20 N·m, then 42 N·m | 14.8 then 31.0 lb-ft |
| Angle stage | All six +100° | Use angle gauge/SST |
| Position-specific finish | Two +100°; four +50° | Follow the factory bolt map |
After the 42 N·m stage, turn all six bolts 100° in sequence; the two designated bolts then receive another 100°, while the other four receive another 50°. Use the factory angle tool/order for each bank and restart the specified preparation if a bolt produces stick-slip noise.
Application boundaries for FA20D BRZ Boxer-Four
The numerical stages apply to the FA20D/4U-GSE BRZ-style engine covered by the linked service manual. Turbo FA20DIT WRX/Forester engines, later FA24 engines and aftermarket studs use different procedures.
After the 42 N·m stage, turn all six bolts 100° in sequence; the two designated bolts then receive another 100°, while the other four receive another 50°. Use the factory angle tool/order for each bank and restart the specified preparation if a bolt produces stick-slip noise.
Subaru FA20D BRZ Boxer-Four specifications can change by model year, engine, platform, wheel, and installed component. Confirm the VIN or engine identity, part numbers, fastener condition, and the current manufacturer instructions before service.
Procedures used with this specification
These steps are the same for every vehicle in this family, so they are documented once rather than repeated on each page. The values above remain specific to this Subaru FA20D BRZ Boxer-Four.
Subaru FA20 Head Bolt Torque Specs and Sequence FAQs
What is the head bolt torque on a Subaru FA20?+
For the naturally aspirated BRZ FA20: oil the six main bolt threads and washers, tighten in order to 20 N·m (14.8 lb-ft), then 100 N·m (73.8 lb-ft), loosen each 360°, retighten to 20 N·m and then 42 N·m (31.0 lb-ft), then complete the angle turns.
What are the FA20's angle stages?+
After the 42 N·m stage, turn all six bolts 100° in sequence. The two designated bolts then receive another 100°, while the other four receive another 50° — so the final angle is position-specific, not uniform.
Does this cover the turbo FA20DIT?+
No. These stages apply to the FA20D/4U-GSE BRZ-style engine in the linked service manual. The turbo FA20DIT in the WRX and Forester, the later FA24 engines and aftermarket studs all use different procedures.
What if a bolt makes a stick-slip noise while tightening?+
Restart the specified preparation for that bolt rather than continuing. Use the factory angle tool and order for each bank.
Technical sources
TorqueSheet favors engine- and component-specific manufacturer instructions over unsourced universal values.
1Subaru BRZ FA20 engine service manual — cylinder head assemblyFactory-format FA20 service procedure specifying the covered six main bolts at 20 N·m, 100 N·m, loosen 360°, 20 N·m, 42 N·m, then position-specific angle stages.↗