Volvo Penta Serpentine Drive Belt 21132390 | 4.3L 5.0L 5.7L 8.1L Gasoline OEM

Volvo Penta 21132390 – Serpentine Accessory Drive Belt

Part Number: 21132390
Brand: Volvo Penta
Official Product Type: Serpentine / Multi-Rib Accessory Drive Belt (OEM)
Supersedes: 3861034, 3889126, 3817290
Replaced By: No current supersession — 21132390 is the active OEM number
Engine Family: Volvo Penta 4.3L, 5.0L, 5.7L, and 8.1L Gasoline Marine Engines
System: Accessory Drive — Alternator and Auxiliary Components
Approximate Length: ~1130 mm (44.5 in)
Weight: 0.4 kg (0.9 lb)

The Volvo Penta 21132390 is a genuine OEM multi-rib serpentine belt for the accessory drive system on selected Volvo Penta gasoline marine engines. It drives the alternator and related accessory pulleys from the crankshaft pulley, maintaining charging output and drive performance. This is a serpentine belt — not interchangeable with a conventional single-groove V-belt.

Compatible Applications

Verify your engine model and serial number before ordering. Multiple serpentine belt part numbers are used across these engine families.

4.3L V6 Gasoline

• Volvo Penta 4.3GL-J / 4.3GL-JF
• Volvo Penta 4.3GXi-J / 4.3GXi-JF
• Volvo Penta 4.3GXiE-M
• Volvo Penta 4.3OSi-J / 4.3OSi-JF

5.0L V8 Gasoline

• Volvo Penta 5.0GXi / 5.0GXi-J / 5.0GXi-JF
• Volvo Penta 5.0OSi / 5.0OSi-JF

5.7L V8 Gasoline

• Volvo Penta 5.7Gi-300
• Volvo Penta 5.7GXi / 5.7GXi-J / 5.7GXi-JF
• Volvo Penta 5.7OSXi / 5.7OSXi-JF

8.1L V8 Gasoline

• Volvo Penta 8.1Gi-H / 8.1Gi-HF
• Volvo Penta 8.1GXi-G / 8.1GXi-GF
• Volvo Penta 8.1OSi-D / 8.1OSi-DF
• Volvo Penta 8.1GI / 8.1GSI / 8.1GXi

Fitment varies by engine generation, serial number range, and accessory configuration. Locate the engine identification plate on the block, valve cover, or timing cover and confirm your exact model and serial number before ordering — especially on 5.0L and 5.7L engines where closely related models use different belt part numbers.

Superseded Part Numbers

• Active OEM number: 21132390
• Replaces: 3861034, 3889126, 3817290

Specifications

• Belt type: Serpentine / Multi-Rib
• Profile: Multi-rib (not V-belt)
• System: Accessory drive — alternator and auxiliary
• Approximate length: ~1130 mm (44.5 in)
• Construction: Reinforced rubber composite
• Weight: 0.4 kg (0.9 lb)

When to Replace

• Belt shows cracking, glazing, frayed edges, or missing rib material
• Belt is contaminated with oil or coolant
• Excessive stretching or persistent squealing from the accessory drive
• Reduced alternator output or accessory drive slippage
• At each scheduled maintenance interval or whenever the tensioner or pulleys are serviced

Service Interval

Replace at the Volvo Penta recommended maintenance interval for your engine model, or immediately if inspection reveals cracking, rib damage, contamination, or slippage. Inspect the tensioner and idler pulleys at every belt replacement — a worn tensioner or seized idler significantly shortens belt life.

Installation Notes

Before installing the new belt, inspect the crankshaft pulley, alternator pulley, idler pulley, and tensioner for wear, wobble, or roughness. Verify that all ribs are fully and evenly seated in the pulley grooves before releasing the tensioner. Route the belt exactly as shown on the engine belt-routing diagram — incorrect routing is one of the most common causes of premature serpentine belt failure on these engines.

Technical FAQ

Q: Is this a V-belt or a serpentine belt?
A: This is a multi-rib serpentine belt, not a conventional single-groove V-belt. Confirm your engine uses a serpentine accessory drive before ordering — these are not interchangeable.

Q: My old belt shows 3889126 — is 21132390 the right replacement?
A: Yes. 21132390 is the current active OEM number and directly replaces 3889126, 3861034, and 3817290.

Q: Should I replace the tensioner at the same time?
A: Inspect the tensioner whenever the belt is replaced. A worn or noisy tensioner causes premature belt failure. Replace it if you notice any roughness, wobble, or reduced spring tension.

Q: What's the difference between the accessory drive belt and the timing belt?
A: The accessory drive belt (this part) drives the alternator and accessories from the front of the engine. The timing belt is an internal component that synchronizes the camshaft and crankshaft — it is a separate service item.

Related Parts

• Volvo Penta Idler Pulley 3860201 — Inspect and replace with belt service
• Volvo Penta Idler Pulley 3847482 — Inspect and replace with belt service
• Volvo Penta Idler Roller 23014427 — Inspect at belt replacement

Parts Desk Insights

The most common ordering mistake with this belt is selecting by displacement alone. The 4.3L, 5.0L, 5.7L, and 8.1L gasoline engine families each use multiple serpentine belt part numbers depending on engine generation and accessory configuration — engine size alone does not determine the correct belt.

When customers replace this belt, it's worth also checking the tensioner and idler pulleys. On older gasoline Volvo Penta engines, worn tensioners and seized idlers are frequently the underlying cause of belt failure. Replacing the belt without addressing these components often leads to early re-failure.

Customers with serpentine belt noise complaints should also rule out a misrouted belt before assuming belt or tensioner failure — incorrect belt routing after a DIY service is a common cause of accessory drive noise on these engines.