Honda K24 Head Bolt Torque Specs by Engine Code
Honda K24 Head Bolt Torque Specs by Engine Code with application boundaries, staged tightening guidance, reuse cautions and official service-information lookup.
For the K24Z7 factory-bolt procedure, apply new engine oil to the threads and under-head surfaces, tighten the ten head bolts to 39 N·m (29 lb-ft), then turn every bolt 90° and another 90° in sequence. A new factory head bolt receives one additional 90° turn.
For the K24Z7 factory-bolt procedure, apply new engine oil to the threads and under-head surfaces, tighten the ten head bolts to 39 N·m (29 lb-ft), then turn every bolt 90° and another 90° in sequence. A new factory head bolt receives one additional 90° turn.
The numerical stages on this page apply specifically to the K24Z7 procedure in the cited Civic service information. K24A, K24A2/A4/A8, K24Z2/Z3, Earth Dreams K24W, mixed K20/K24 builds and aftermarket stud kits require the exact engine-code or fastener-maker procedure.
Interactive K24Z7 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.
Honda K24 Head Bolt Torque Specs
| APPLICATION / ITEM | SPECIFICATION | NOTES |
|---|---|---|
| Initial torque | 39 N·m (29 lb-ft) | Oiled threads and under-head surfaces |
| Angle pass 1 | 90° | All ten bolts in sequence |
| Angle pass 2 | Additional 90° | All ten bolts |
| New factory bolt | One extra 90° | K24Z7 manual condition |
| Minimum bolt diameter | 10.6 mm (0.417 in) | Measure at both specified points |
| Other K24 variants | Verify separately | Do not generalize this chart |
Measure each factory bolt at both inspection points and replace it if either diameter is below 10.6 mm (0.417 in). Use a beam-type wrench or tighten a click wrench slowly for the 39 N·m stage. If a bolt makes noise or is turned beyond the required angle, remove it and restart the prescribed operation instead of backing it up to the paint mark.
Application boundaries for K24Z7 Inline-Four
The numerical stages on this page apply specifically to the K24Z7 procedure in the cited Civic service information. K24A, K24A2/A4/A8, K24Z2/Z3, Earth Dreams K24W, mixed K20/K24 builds and aftermarket stud kits require the exact engine-code or fastener-maker procedure.
Measure each factory bolt at both inspection points and replace it if either diameter is below 10.6 mm (0.417 in). Use a beam-type wrench or tighten a click wrench slowly for the 39 N·m stage. If a bolt makes noise or is turned beyond the required angle, remove it and restart the prescribed operation instead of backing it up to the paint mark.
Honda K24Z7 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 Honda K24Z7 Inline-Four.
Honda K24 Head Bolt Torque Specs by Engine Code FAQs
What is the head bolt torque on a Honda K24?+
For the K24Z7 factory-bolt procedure: oil the threads and under-head surfaces, tighten the ten bolts to 39 N·m (29 lb-ft), then turn every bolt 90° and another 90° in sequence. A new factory head bolt receives one additional 90° turn.
How do I know whether a K24 head bolt can be reused?+
Measure each factory bolt at both inspection points and replace it if either diameter is below 10.6 mm (0.417 in). This engine publishes a dimensional limit, so reuse is a measurement rather than a judgment call.
What if I over-turn a bolt past its angle mark?+
Remove it and restart the prescribed operation. Do not back the bolt up to the paint mark — the same applies if a bolt makes noise while tightening.
Does this procedure cover other K-series engines?+
No. These stages are specific to the K24Z7 procedure in the cited Civic service information. The K24A, K24A2/A4/A8, K24Z2/Z3, Earth Dreams K24W, mixed K20/K24 builds and aftermarket stud kits each require their own engine-code or fastener-maker procedure.
What kind of wrench should be used for the 39 N·m stage?+
A beam-type wrench, or a click wrench tightened slowly, so the reading is not overshot before the tool releases.
Technical sources
TorqueSheet favors engine- and component-specific manufacturer instructions over unsourced universal values.
1Honda Civic service manual transcription — K24Z7 cylinder headService-manual procedure for the K24Z7 specifying 39 N·m, two 90° turns, an additional 90° for a new bolt, oiled threads and under-head surfaces, and a 10.6 mm minimum bolt diameter.↗