Balance Shaft Belt – General Information, Maintenance Intervals, Part Number – 2.5L NA

Overview

The balance shaft belt in the Porsche 944 (9-valve engine) works with the balance shafts to reduce engine vibrations, ensuring smoother operation. Regular inspection and replacement of the balance shaft belt are critical to prevent belt failure, which can lead to severe engine damage. This guide provides general information, recommended maintenance intervals, and part numbers for the balance shaft belt, specific to the Porsche 944 (8-valve) for pre-1985.5 (1983–1985.5) and 1985.5 onwards (1985.5–1988) models. It is based on the latest factory recommendations and practical experience to help DIY enthusiasts maintain their vehicles.

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Parts Required

• Balance Shaft Belt: 944 102 219 02 (All 1983–1988)
• Tensioner Stud (Pre-85.5): 944 102 216 01 (1984.5–1986; recommended replacement due to failure risk)
• Balance Belt Tensioner Roller: 944 102 025 07 (All 1983–1988; inspect and replace if worn)
• Balance Belt Roller: 944 102 277 06 (All 1983–1988; inspect and replace if worn)
• Balance Belt Gear Woodruff Key: N 012 708 2 (2 required, All 1983–1988; inspect and replace if damaged)
• Crankshaft Woodruff Key (5mm x 5mm x 22mm): 900 117 036 00 (All 1983–1988; inspect and replace if damaged)

Step-by-Step Procedure

Step 1: Understand Maintenance Intervals

1. Review the recommended maintenance intervals for the balance shaft belt to plan inspections and replacements:

For All 1983–1988 Models:
At 2,000 miles (3,218 km): Inspect and retension the balance shaft belt.
At 15,000 miles (24,140 km): Inspect and retension the balance shaft belt. For vehicles with limited use, inspect after 2 years if 15,000 miles (24,140 km) has not been reached, and annually thereafter.
At 30,000 miles (48,280 km): Inspect and retension the balance shaft belt.
At 45,000 miles (72,420 km): Replace the balance shaft belt. Inspect rollers and replace if necessary.

Step 2: Identify Required Parts

2. Ensure you have the correct parts for your model year before performing maintenance:

For All 1983–1988 Models:
Use Balance Shaft Belt: 944 102 219 02.

For Pre-85.5 Models (1983–1985.5):
Replace Tensioner Stud: 944 102 216 01 (101 mm long) at each belt replacement due to reported failures. Note: Early 1983–1984 models may use a 106 mm stud, which is not available from Porsche. Verify stud length before ordering.

For 85.5 Onwards Models (1985.5–1988):
No tensioner stud replacement is needed, as these models use spring tensioners.
Inspect Balance Belt Tensioner Roller: 944 102 025 07 and Balance Belt Roller: 944 102 277 06. Replace if signs of wear, cracking, or noise are present.
Check Balance Belt Gear Woodruff Keys: N 012 708 2 (2 required) and Crankshaft Woodruff Key: 900 117 036 00. Replace if damaged or misaligned.

Step 3: Plan for Replacement Procedures

3. When replacing the balance shaft belt, follow the appropriate procedure:

Follow this link to ensure these steps – Balance Shaft Belt Removal – and – Balance Shaft Belt Installation – of the process are followed accurately.

For Pre-85.5 Models (1983–1985.5):
Pay special attention to the tensioner stud replacement due to its failure risk. Ensure the correct stud length (101 mm or 106 mm) is used.

For 85.5 Onwards Models (1985.5–1988):
Verify the spring tensioner is functioning correctly during belt replacement.

Post Procedure Checklist

• Confirm the correct balance shaft belt part number (944 102 219 02) is used for your model year.
• Verify maintenance intervals are scheduled: inspections at 2,000 miles (3,218 km), 15,000 miles (24,140 km), and 30,000 miles (48,280 km), and replacement at 45,000 miles (72,420 km).
• For Pre-85.5 models, ensure the tensioner stud (944 102 216 01) is replaced and the correct length is installed.
• Inspect rollers and woodruff keys for wear and replace if necessary to prevent future issues.

Sources

• Clark’s Garage
• Pelican Parts
• Porsche 944 Workshop Manuals
• YouTube