CV Joint Boot Check – 2.5L NA

Overview

The CV (Constant Velocity) joint boots on your Porsche 944 (8-valve engine variants) protect the CV joints by keeping grease in and dirt out. Regular inspection ensures the boots are intact, preventing joint damage due to leaks or contamination. This guide covers the inspection process for both Pre-1985.5 (1983–1985.5) and 1985.5 onwards (1986–1988) models. Check the boots every 15,000 miles (24,000 km) or during routine maintenance.

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Tools Required

• Jack stands (pair)
• Floor jack

Parts Required

None (Replacement boots may be needed if damage is found: 944 331 903 00 for inner or outer CV joint boot, confirm fitment for your model year).

Step-by-Step Procedure

Step 1: Raise the Vehicle

1. Park the Porsche 944 on a flat, stable surface.
2. Engage the parking brake and chock the front wheels for safety.
3. Use a floor jack to lift the rear of the vehicle by placing it under the rear differential or a designated jacking point (refer to your owner’s manual for exact location).
4. Securely place jack stands under the rear suspension or chassis at the recommended support points for your model:

(Pre-85.5) Use the rear torsion bar housing or chassis reinforcement points.

(85.5 Onwards) Use the updated chassis reinforcement points or subframe mounts, as suspension design changed slightly.

5. Lower the vehicle onto the jack stands and ensure it is stable before proceeding.

Step 2: Inspect the CV Joint Boots

6. Locate the CV joint boots on the rear axles. Each axle has an inner and outer CV joint, each covered by a rubber boot. These are visible on the drive shafts connecting the transaxle to the rear wheels.
7. Visually inspect each boot for signs of cracking, tears, or damage. Look for cracks deeper than 1 mm (0.04 inches).
8. Gently squeeze each CV joint boot to check for grease leaking from cracks or splits. A small amount of grease on the exterior is normal, but significant leakage indicates a compromised boot.
9. If any boot shows deep cracks (more than 1 mm or 0.04 inches) or grease leakage, it must be replaced with a new boot (944 331 903 00). Follow the CV Joint Boot Replacement procedure for your model year.

Post Procedure Checklist

• Verify all CV joint boots were inspected (inner and outer, both rear axles).
• Ensure no deep cracks or grease leaks were missed during inspection.
• Confirm the vehicle is safely lowered and jack stands are removed.
• Schedule boot replacement if damage was found, as driving with a damaged boot can lead to CV joint failure.

Sources

• Clark’s Garage
• Pelican Parts
• Porsche 944 Workshop Manual, Volume 1
• YouTube