🔧 CX-30 - Engine Mount Replacement

Engine mounts hold the engine/transmission in place and control vibration. When a mount tears or collapses, you may feel clunks, excess vibration, or harsh shifting. The key to this job is supporting the engine safely before unbolting any mount.

Difficulty Level: Advanced | Estimated Time: 2-5 hours

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⚠️ Safety & Precautions

• ⚠️ Never remove an engine mount without supporting the engine first.
• ⚠️ Work on level ground and support the CX-30 with jack stands, not a jack.
• ⚠️ Keep hands clear when raising/lowering the engine support/jack.
• ⚠️ If you lift the engine with a floor jack, use a wide wood block to spread the load on the oil pan (do not jack directly on bare metal).
• ⚠️ Let the engine cool fully before working near exhaust/heat shields.
• ⚠️ Battery disconnect is recommended if you’ll remove the air intake components near wiring.

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🔧 Required Tools

You'll need the following tools for this repair:

• Floor jack (rated 3-ton minimum)
• Jack stands (rated 3-ton minimum)
• Wheel chocks
• Safety glasses
• Nitrile gloves
• Metric socket set (8mm-19mm)
• 3/8" drive ratchet
• 1/2" drive breaker bar
• Metric wrench set (10mm-19mm)
• Torque wrench (10-200 Nm range)
• Extensions (3", 6", 12")
• Universal joint adapter
• Trim clip remover
• Flathead screwdriver
• Pry bar
• Paint marker
• Engine support bar (specialty)
• Wood block (2x6 or similar, 12-18")

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🔩 Required Parts

HowToo sells all the parts you need for this repair:

• Right-side engine mount - Qty: 1
• Left-side transmission mount - Qty: 1
• Rear engine mount - Qty: 1
• New engine mount hardware (bolts/nuts) - Qty: 1 set

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📋 Before You Begin

• Park on level ground, set the parking brake, and chock the rear wheels.
• Decide which mount you’re replacing: right (passenger-side), left (driver-side/trans), rear (lower). Different mounts have different access.
• An engine support bar is a beam that spans the fenders and holds the engine from above while mounts are removed.
• If you don’t have an engine support bar, you can support from below with a floor jack and wood block, but go slowly and never lift high.
• Optional but recommended: disconnect the negative battery cable using a 10mm wrench.

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🔨 Step-by-Step Instructions

Follow these steps in order:

Step 1: Confirm which mount you’re doing first

• Open the hood and locate the right-side mount near the coolant reservoir/engine side using a flashlight (from your phone is fine).
• The rear mount is usually accessed from underneath after removing the lower splash shield using a trim clip remover and 10mm socket.
• Start with the easiest-access mount first.

Step 2: Raise and safely support the CX-30

• Lift the front using a floor jack (rated 3-ton minimum) at the front center jacking point.
• Set the vehicle onto jack stands (rated 3-ton minimum) at the proper front pinch weld/support points.
• Shake the vehicle lightly to confirm it’s stable.

Step 3: Remove the lower splash shield (if needed)

• Remove underbody clips with a trim clip remover.
• Remove bolts with a 10mm socket and ratchet.
• Set the shield and fasteners aside in order.

Step 4: Support the engine

• Best method: Install the engine support bar (specialty) across the strut towers and tension it to take the engine’s weight.
• Alternate method: Place a wood block on the floor jack pad and gently contact the oil pan area with the wood in between.
• Raise just enough to “hold” the engine (do not lift the car off the stands).
• Small movements make big alignment changes.

Step 5: Remove components blocking the mount (varies by mount)

• For the right-side mount: remove the air intake duct/box if it blocks access using a flathead screwdriver (hose clamps) and 10mm socket (box bolts).
• For the rear mount: access from underneath; you may need a long extension (12") and universal joint adapter for tight bolts.

Step 6: Mark mount position (helps alignment)

• Use a paint marker to mark the mount bracket outline and bolt positions.
• This helps you reinstall without fighting alignment.

Step 7: Unbolt the mount from the engine/bracket

• Loosen mount fasteners using a breaker bar and appropriate metric socket (commonly 14mm-17mm range).
• Remove fasteners with a ratchet and extensions.
• If the bolt binds, slightly raise/lower the engine using the engine support bar or floor jack to relieve tension.

Step 8: Unbolt the mount from the body/subframe

• Remove mount-to-body bolts using a ratchet, extensions, and correct metric socket.
• For tight access, use a universal joint adapter.
• Remove the mount from the vehicle (you may need to angle it out carefully).

Step 9: Install the new mount and hand-start all bolts

• Position the new mount in place by hand.
• Hand-thread all bolts/nuts first using your fingers, then snug with a ratchet.
• Do not fully tighten yet; leave it slightly loose for alignment.

Step 10: Set the engine to neutral “resting” position

• Slowly lower the engine support (or floor jack) until the engine sits naturally on the mount.
• Watch the mount studs/holes and adjust height until everything sits without forcing bolts.

Step 11: Torque fasteners to Mazda specifications

• Torque mount-to-body fasteners using a torque wrench (10-200 Nm range).
• Torque mount-to-engine/bracket fasteners using a torque wrench (10-200 Nm range).
• Torque to factory specification for the specific mount and bolt size.
• Overtightening can tear new rubber.

Step 12: Reinstall removed components

• Reinstall intake parts using a 10mm socket and tighten clamps with a flathead screwdriver.
• Reinstall the splash shield using a 10mm socket and push-clips with a trim clip remover.

Step 13: Lower the vehicle

• Raise slightly with the floor jack, remove the jack stands, then lower to the ground.
• Remove wheel chocks last.

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✅ After Repair

• Start the engine and let it idle; listen for clunks or unusual vibration.
• With your foot on the brake, shift through R/N/D briefly and feel for excessive movement.
• Test drive at low speed over a small bump; recheck for noise.
• Recheck mount fasteners for tightness after 1-2 days of driving.

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💰 DIY vs Shop Cost

Shop Cost: $500-$1,200 (parts + labor)

DIY Cost: $120-$450 (parts only)

You Save: $380-$750 by doing it yourself!

Shop labor rates vary but typically run $100-$150/hour. This repair takes a shop approximately 2-5 hours.

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🎯 Ready to get started?

HowToo makes it easy: same-day/2-day shipping on every part, plus all the tools and specialty tools you need! Check out the parts and tools sections below to add everything to your cart.