Nissan SR20DET Head Bolt Torque Specs and Sequence
Nissan SR20DET Head Bolt Torque Specs and Sequence with application boundaries, staged tightening guidance.
For the 1994 S14 SR20DET factory-bolt procedure, tighten the ten main head bolts to 39 N·m (29 lb-ft), then 78 N·m (58 lb-ft), loosen them completely, retighten to 34–44 N·m (25–33 lb-ft), and turn each bolt 90–95° in sequence.
For the 1994 S14 SR20DET factory-bolt procedure, tighten the ten main head bolts to 39 N·m (29 lb-ft), then 78 N·m (58 lb-ft), loosen them completely, retighten to 34–44 N·m (25–33 lb-ft), and turn each bolt 90–95° in sequence.
These stages are tied to the S14 SR20DET workshop manual. S13 and S15 market revisions, GTi-R transverse installations, replacement blocks or heads, nonstandard gaskets and aftermarket studs must be checked against their own documentation.
Interactive S14 SR20DET Inline-Four center-out sequence aid
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This balanced pattern is an orientation aid; use the exact numbered manufacturer diagram for assembly.
Nissan Sr20det Head Bolt Torque Specs
| APPLICATION / ITEM | SPECIFICATION | NOTES |
|---|---|---|
| Stage 1 | 39 N·m (29 lb-ft) | Exact ten-bolt sequence |
| Stage 2 | 78 N·m (58 lb-ft) | Repeat full sequence |
| Stage 3 | Loosen completely | All ten bolts |
| Stage 4 | 34–44 N·m (25–33 lb-ft) | Re-establish base torque |
| Final stage | 90–95° | Use angle wrench or manual paint-mark method |
| Maximum bolt length | 158.2 mm (6.228 in) | Replace if exceeded |
Oil the factory-bolt threads and seating surfaces as the manual directs, install the washers, and replace any bolt longer than the 158.2 mm (6.228 in) limit. Use an angle wrench for the final turn; if paint marks are used as the manual's alternative, complete one 90–95° pass rather than attempting 180–190° at once.
Application boundaries for S14 SR20DET Inline-Four
These stages are tied to the S14 SR20DET workshop manual. S13 and S15 market revisions, GTi-R transverse installations, replacement blocks or heads, nonstandard gaskets and aftermarket studs must be checked against their own documentation.
Oil the factory-bolt threads and seating surfaces as the manual directs, install the washers, and replace any bolt longer than the 158.2 mm (6.228 in) limit. Use an angle wrench for the final turn; if paint marks are used as the manual's alternative, complete one 90–95° pass rather than attempting 180–190° at once.
Nissan S14 SR20DET 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 Nissan S14 SR20DET Inline-Four.
Nissan SR20DET Head Bolt Torque Specs and Sequence FAQs
What is the head bolt torque on an SR20DET?+
For the 1994 S14 procedure: tighten the ten main bolts to 39 N·m (29 lb-ft), then 78 N·m (58 lb-ft), loosen them completely, retighten to 34–44 N·m (25–33 lb-ft), then turn each bolt 90–95° in sequence.
How do I know if an SR20DET head bolt is stretched?+
Replace any bolt longer than the 158.2 mm (6.228 in) limit. That published length is the reuse criterion for this engine.
Can I do the final angle as one 180–190° turn?+
No. If you are using the manual's paint-mark alternative rather than an angle wrench, complete one 90–95° pass — do not attempt the total at once.
Does this cover an S13 or S15 SR20DET?+
No. These stages are tied to the S14 workshop manual. S13 and S15 market revisions, GTi-R transverse installations, replacement blocks or heads, nonstandard gaskets and aftermarket studs must be checked against their own documentation.
Technical sources
TorqueSheet favors engine- and component-specific manufacturer instructions over unsourced universal values.
11994 Nissan S14 workshop manual — SR20DET cylinder headFactory workshop-manual transcription for the covered S14 SR20DET specifying 39 N·m, 78 N·m, complete loosening, 34–44 N·m and a final 90–95° turn, plus the 158.2 mm bolt-length limit.↗