Editing Z31/Nuts and Bolts (section)

= Z31 Nuts & Bolts — Thread Pitch and Torque Specs =

Reference tables for Z31 (1984–1989 Nissan 300ZX) fastener specifications.
All torque values are for clean, dry threads unless noted. N/A = not applicable or spec not established.

== Engine ==

=== VG30E/ET block ===

{| class="wikitable sortable"
|-
! Location !! Thread !! Torque (lb·ft) !! Torque (N·m) !! Notes
|-
| Main bearing cap bolts || M11 × 1.25 || 36–43 || 49–59 || 2-stage; final 90° torque-angle optional
|-
| Rod bearing cap bolts || M9 × 1.25 || 22–27 || 30–36 ||
|-
| Cylinder head bolts || M11 × 1.25 || 62–68 || 84–93 || Cold; retorque after warmup
|-
| Camshaft Sprocket Bolts || M10 × 1.25 || 58–65 || 78–88 || Measured @ 28mm; can use 30mm
|-
| Camshaft bearing cap bolts || M8 × 1.25 || 13–15 || 18–20 ||
|-
| Rocker cover (valve cover) bolts || M6 × 1.0 || 2.9–3.6 || 4–5 ||
|-
| Oil pan bolts (to block) || M6 × 1.0 || 5–6 || 7–8 ||
|-
| Oil drain plug || M14 × 1.5 || 22–29 || 29–39 ||
|-
| Oil filter adapter || M20 × 1.5 || 12–15 || 16–20 ||
|-
| Spark plugs || M14 × 1.25 || 14–22 || 20–30 ||
|-
| Crankshaft pulley bolt || M24 × 1.5 || 159–174 || 216–235 ||
|-
| Flywheel / driveplate bolts || M10 × 1.25 || 61–69 || 83–93 ||
|-
| Timing belt tensioner || M8 × 1.25 || 12–15 || 16–21 ||
|-
| Thermostat housing || M6 × 1.0 || 5–8 || 7–11 ||
|-
| Intake manifold bolts || M8 × 1.25 || 13–15 || 18–20 ||
|-
| Exhaust manifold nuts || M10 × 1.25 || 27–35 || 37–47 ||
|-
| Turbo-to-manifold nuts (ET) || M10 × 1.25 || 27–35 || 37–47 ||
|-
| Turbo oil feed banjo bolt (ET) || M12 × 1.25 || 12–15 || 16–21 ||
|}

=== Lubrication ===

{| class="wikitable sortable"
|-
! Location !! Thread !! Torque (lb·ft) !! Torque (N·m)
|-
| Oil pump bolts || M6 × 1.0 || 5–6 || 7–8
|-
| Oil pressure sender || M16 × 1.5 || 11–18 || 15–25
|}

== Transmission ==

=== Manual (FS5W71C / RS5F50A) ===

{| class="wikitable sortable"
|-
! Location !! Thread !! Torque (lb·ft) !! Torque (N·m)
|-
| Trans-to-engine bolts || M12 × 1.25 || 29–36 || 39–49
|-
| Drain / fill plugs || M24 × 1.5 || 22–36 || 29–49
|-
| Rear mount-to-crossmember || M10 × 1.25 || 22–29 || 30–39
|-
| Shift lever retainer bolts || M8 × 1.25 || 9–12 || 12–16
|}

=== Automatic (RE4W03A) ===

{| class="wikitable sortable"
|-
! Location !! Thread !! Torque (lb·ft) !! Torque (N·m)
|-
| Trans-to-engine bolts || M12 × 1.25 || 29–36 || 39–49
|-
| Torque converter-to-flexplate || M10 × 1.25 || 33–40 || 44–54
|-
| Trans oil pan bolts || M6 × 1.0 || 3.6–5 || 5–7
|-
| Trans drain plug || M18 × 1.5 || 22–29 || 29–39
|}

== Driveline ==

{| class="wikitable sortable"
|-
! Location !! Thread !! Torque (lb·ft) !! Torque (N·m) !! Notes
|-
| Driveshaft-to-diff flange bolts || M10 × 1.25 || 29–36 || 39–49 ||
|-
| Driveshaft center bearing bracket || M8 × 1.25 || 9–14 || 12–19 ||
|-
| Differential mounting bolts || M12 × 1.25 || 40–47 || 54–64 ||
|-
| Axle/stub shaft nut (rear) || M24 × 1.5 || 152–203 || 206–275 || Stake after tightening
|-
| Half-shaft-to-diff bolts || M8 × 1.25 || 25–33 || 34–44 ||
|}

== Brakes ==

{| class="wikitable sortable"
|-
! Location !! Thread !! Torque (lb·ft) !! Torque (N·m) !! Notes
|-
| Brake caliper slide pins || M8 × 1.25 || 16–23 || 22–31 ||
|-
| Caliper bracket bolts (front) || M12 × 1.25 || 53–72 || 72–97 ||
|-
| Caliper bracket bolts (rear) || M10 × 1.25 || 28–38 || 38–52 ||
|-
| Brake rotor screws || M6 × 1.0 || 4–7 || 5–9 ||
|-
| Master cylinder to booster || M10 × 1.25 || 7–12 || 9–16 ||
|-
| Brake line fittings (metric) || M10 × 1.0 || 10–13 || 14–18 ||
|-
| Wheel lug nuts || M12 × 1.25 || 58–72 || 79–98 || Conical seat
|}

== Suspension & steering ==

=== Front ===

{| class="wikitable sortable"
|-
! Location !! Thread !! Torque (lb·ft) !! Torque (N·m) !! Notes
|-
| Strut-to-knuckle pinch bolt || M12 × 1.25 || 58–72 || 79–98 ||
|-
| Strut top mount nuts || M10 × 1.25 || 22–30 || 30–40 ||
|-
| Lower control arm pivot bolt || M14 × 1.5 || 69–83 || 94–113 || Tighten at ride height
|-
| Lower ball joint nut || M12 × 1.25 || 52–64 || 70–87 || Cotter pin
|-
| Sway bar end link nuts || M8 × 1.25 || 12–16 || 16–21 ||
|-
| Sway bar clamp bolts || M8 × 1.25 || 9–12 || 12–16 ||
|-
| Steering rack mount bolts || M10 × 1.25 || 29–36 || 39–49 ||
|-
| Tie rod end nut || M12 × 1.25 || 22–29 || 30–39 || Cotter pin
|-
| Tie rod jam nut || M14 × 1.5 || 58–72 || 79–98 ||
|}

=== Rear ===

{| class="wikitable sortable"
|-
! Location !! Thread !! Torque (lb·ft) !! Torque (N·m) !! Notes
|-
| Strut-to-knuckle bolt || M12 × 1.25 || 58–72 || 79–98 ||
|-
| Strut top mount nuts || M10 × 1.25 || 22–30 || 30–40 ||
|-
| Rear lower arm pivot bolts || M14 × 1.5 || 69–83 || 94–113 || Tighten at ride height
|-
| Rear upper arm pivot bolts || M12 × 1.25 || 47–58 || 64–78 ||
|-
| Rear toe arm bolts || M14 × 1.5 || 69–83 || 94–113 ||
|-
| Rear sway bar end links || M8 × 1.25 || 12–16 || 16–21 ||
|-
| Rear crossmember bolts || M12 × 1.25 || 40–47 || 54–64 ||
|}

== Body & misc. ==

{| class="wikitable sortable"
|-
! Location !! Thread !! Torque (lb·ft) !! Torque (N·m)
|-
| Hood hinge bolts || M8 × 1.25 || 9–14 || 12–19
|-
| Seat belt anchor bolts || M12 × 1.25 || 22–29 || 30–39
|-
| Battery terminal bolts (side post) || M5 × 0.8 || 3–4 || 4–5
|}

== Notes ==

* All values from the Z31 FSM (Factory Service Manual) unless otherwise noted.
* Torque specs assume clean, dry threads. Add ~10% for oiled threads, or consult the FSM.
* Suspension fasteners marked "tighten at ride height" must be torqued with the suspension at normal ride height (car on ground or on a lift with suspension loaded), not with wheels hanging.
* "Stake" means deform the nut flange into the shaft groove after torquing to prevent loosening.

== See also ==

* [[Z31/z31fsm_php|Z31 Factory Service Manuals]] — full FSM PDFs
* [[Z31/timingbelt|Timing belt replacement]]
* [[Z31/basics|Z31 basics]]

[[Category:Z31]]
[[Category:Reference]]
[[Category:Maintenance]]