Toyota 4A-GE Head Bolt Torque Specs by Generation
Toyota 4A-GE Head Bolt Torque Specs by Generation with application boundaries, staged tightening guidance.
For the later 4A-GE procedure documented in Toyota's repair manual, oil the bolt threads and undersides, tighten the ten bolts to 29 N·m (22 lb-ft), then turn each bolt 90° and another 90° in sequence. Early AE86-era 4A-GE engines can use a different final-torque procedure.
For the later 4A-GE procedure documented in Toyota's repair manual, oil the bolt threads and undersides, tighten the ten bolts to 29 N·m (22 lb-ft), then turn each bolt 90° and another 90° in sequence. Early AE86-era 4A-GE engines can use a different final-torque procedure.
The numerical torque-angle chart applies to the later factory-bolt 4A-GE revision covered by the linked manual. Early 16-valve engines, 20-valve market variants, 4A-GZE combinations and aftermarket studs must be identified separately.
Interactive 4A-GE Inline-Four center-out sequence aid
Branded downloads includedPNG and PDF exports carry the TorqueSheet logo, torquesheet.com, source-page URL, and republishing attribution request. The PDF source link is clickable.
This balanced pattern is an orientation aid; use the exact numbered manufacturer diagram for assembly.
Toyota 4age Head Bolt Torque Specs
| APPLICATION / ITEM | SPECIFICATION | NOTES |
|---|---|---|
| Later 4A-GE initial torque | 29 N·m (22 lb-ft) | Oiled threads and bolt undersides |
| Angle pass 1 | 90° | Exact ten-bolt sequence |
| Angle pass 2 | Additional 90° | Verify with paint marks |
| Early 4A-GE | Different procedure | Confirm engine/year before assembly |
| Bolt locations | Two documented lengths | Do not interchange positions |
Toyota identifies two bolt lengths, requires several even passes for the initial torque, and uses paint marks to verify both angle turns. Inspect the bolts to the manual's dimensional limits and never merge an early single-torque chart with the later angle procedure.
Application boundaries for 4A-GE Inline-Four
The numerical torque-angle chart applies to the later factory-bolt 4A-GE revision covered by the linked manual. Early 16-valve engines, 20-valve market variants, 4A-GZE combinations and aftermarket studs must be identified separately.
Toyota identifies two bolt lengths, requires several even passes for the initial torque, and uses paint marks to verify both angle turns. Inspect the bolts to the manual's dimensional limits and never merge an early single-torque chart with the later angle procedure.
Toyota 4A-GE Inline-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 Toyota 4A-GE Inline-Four.
Toyota 4A-GE Head Bolt Torque Specs by Generation FAQs
What is the head bolt torque on a Toyota 4A-GE?+
For the later 4A-GE revision in Toyota's repair manual: oil the bolt threads and undersides, tighten the ten bolts to 29 N·m (22 lb-ft) in several even passes, then turn each bolt 90° and another 90° in sequence.
Does an AE86-era 4A-GE use the same procedure?+
Not necessarily — early 4A-GE engines can use a different final-torque procedure. Never merge an early single-torque chart with the later angle procedure; confirm the engine and year before assembly.
Are all 4A-GE head bolts the same length?+
No. Toyota identifies two bolt lengths, and the positions must not be interchanged.
How are the angle turns verified?+
With paint marks on the bolt heads, checked after each of the two 90° stages. Inspect the bolts against the manual's dimensional limits before reuse.
Technical sources
TorqueSheet favors engine- and component-specific manufacturer instructions over unsourced universal values.
1Toyota 4A-FE/4A-GE engine repair manualToyota engine repair-manual pages provide 4A-GE ignition service data, firing order and distributor procedures.↗