Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
2010 Mazda 5 L4-2.3LFACTORY OEM SERVICE PROCEDURE
System Specifications
Cylinder Head
Cylinder Head Surface Variation

^ Measure the cylinder head for distortion in six directions as shown in the figure.
^ If it exceeds the maximum specification, replace the cylinder head.
^ Cylinder head gasket contact surface distortion (Maximum) 0.10 mm (0.004 in)
^ Measure the manifold contact surface distortion as shown in the figure.
^ If it exceeds the maximum specification, grind the surface or replace the cylinder head.
Manifold contact surfaces distortion (Maximum) 0.10 mm (0.004 in)
Manifold contact surfaces distortion (Maximum grinding) 0.15 mm (0.006 in)
Cylinder Head Bolt Re-usability

Cylinder Head Bolt Length L
1. Measure the length of each bolt.
^ If it exceeds the specification, replace the bolt.
Bolt length (mm (in))
Cylinder head bolt (With washer)
Standard: 149.2-149.8 (5.87-5.90)
Maximum: 150.5 (5.91)
Cylinder head bolt (Without washer)
Standard: 145.2-145.8 (5.72-5.74)
Maximum: 146.5 (5.77)
Cylinder Head Bolt Assembly

Tighten the cylinder head bolts in the order indicated in the figure in 5 steps using the SST (49 D032 316).
Tightening torque
(1) 3-11 N-m (30.6-112 kgf-cm, 26.6-97.3 In-lbf)
(2) 13-17 N-m (1.4-1.7 kgf-m, 9.6-12.5 ft-lbf)
(3) 43-47 N-m (4.4-4.7 kgf-m, 31.8-34.6 ft-lbf)
(4) 88°-92°
(5) 88°-92°
Camshaft Cap Bolt

Tighten the camshaft cap bolt in the order shown two steps.
Tightening torque
(1) 5.0-9.0 N-m (51.0-91.7 kgf-cm, 44.3-79.5 in-lbf)
(2) 14-17 N-m (1.43-1.73 kgf-m, 10.4-12.5 ft-lbf)
Camshaft Sprocket, Variable Valve Timing Actuator Assembly Note
1. Hold the camshaft using a suitable wrench on the cast hexagon as shown in the figure.

2. Tighten the camshaft sprocket lock bolt.
Tightening torque 69-75 N-m (7.1-7.6 kgf-m, 50.9-55.3 ft-lbf)
Exhaust Manifold
Tighten the exhaust manifold installation nuts in the order shown in the figure.

Tighten to 43-64 N-m (4.4-6.5 kgf-m, 32-47 ft-lbf)
Cylinder Head Surface Variation
^ Measure the cylinder head for distortion in six directions as shown in the figure.
^ If it exceeds the maximum specification, replace the cylinder head.
^ Cylinder head gasket contact surface distortion (Maximum) 0.10 mm (0.004 in)
^ Measure the manifold contact surface distortion as shown in the figure.
^ If it exceeds the maximum specification, grind the surface or replace the cylinder head.
Manifold contact surfaces distortion (Maximum) 0.10 mm (0.004 in)
Manifold contact surfaces distortion (Maximum grinding) 0.15 mm (0.006 in)
Cylinder Head Bolt Re-usability
Cylinder Head Bolt Length L
1. Measure the length of each bolt.
^ If it exceeds the specification, replace the bolt.
Bolt length (mm (in))
Cylinder head bolt (With washer)
Standard: 149.2-149.8 (5.87-5.90)
Maximum: 150.5 (5.91)
Cylinder head bolt (Without washer)
Standard: 145.2-145.8 (5.72-5.74)
Maximum: 146.5 (5.77)
Cylinder Head Bolt Assembly
Tighten the cylinder head bolts in the order indicated in the figure in 5 steps using the SST (49 D032 316).
Tightening torque
(1) 3-11 N-m (30.6-112 kgf-cm, 26.6-97.3 In-lbf)
(2) 13-17 N-m (1.4-1.7 kgf-m, 9.6-12.5 ft-lbf)
(3) 43-47 N-m (4.4-4.7 kgf-m, 31.8-34.6 ft-lbf)
(4) 88°-92°
(5) 88°-92°
Camshaft Cap Bolt
Tighten the camshaft cap bolt in the order shown two steps.
Tightening torque
(1) 5.0-9.0 N-m (51.0-91.7 kgf-cm, 44.3-79.5 in-lbf)
(2) 14-17 N-m (1.43-1.73 kgf-m, 10.4-12.5 ft-lbf)
Camshaft Sprocket, Variable Valve Timing Actuator Assembly Note
1. Hold the camshaft using a suitable wrench on the cast hexagon as shown in the figure.
2. Tighten the camshaft sprocket lock bolt.
Tightening torque 69-75 N-m (7.1-7.6 kgf-m, 50.9-55.3 ft-lbf)
Exhaust Manifold
Tighten the exhaust manifold installation nuts in the order shown in the figure.
Tighten to 43-64 N-m (4.4-6.5 kgf-m, 32-47 ft-lbf)
Factory Service Tools
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.
When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- β’ You smell fuel, burning insulation, or see smoke.
- β’ Brakes feel soft, pull hard to one side, or make grinding noises.
- β’ The engine overheats, stalls repeatedly, or misfires under load.
- β’ You are missing required tools, torque specs, or safe lifting equipment.
- β’ You are not confident in the next step or safety outcome.
