Volvo Penta D4 D6 Belt Tensioner 24542601
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Volvo Penta D4 D6 Belt Tensioner 24542601
Part Number: 24542601
Brand: Volvo Penta
Product Type: Automatic Spring-Loaded Belt Tensioner (OEM)
System: Accessory / Alternator Belt Drive
Quantity Required: 1 per applicable engine
Approximate Weight: 700 g
Supersedes: 21344508, 23272815, 24077907
What This Part Does
The 24542601 is a genuine OEM automatic spring-loaded belt tensioner used across a wide range of Volvo Penta D4 and D6 marine diesel engines. It maintains correct tension on the front accessory / alternator belt as the belt wears and stretches in service, helping prevent belt slip, charging system issues, pulley wear, and premature belt failure. This is the current service consolidation for several earlier tensioner numbers across the D4/D6 engine range.
Compatible Applications
Confirm your exact engine model and serial number before ordering. Because 24542601 spans multiple D4 and D6 production generations, one application catalog specifies this tensioner for engines from serial number 2004029745 and later — verify the change point against the Volvo Penta parts diagram for your specific engine.
- Volvo Penta D4-145I-G
- Volvo Penta D4-150A-G
- Volvo Penta D4-175I-G
- Volvo Penta D4-180I-B / C / D / E / F
- Volvo Penta D4-210A / D4-210I
- Volvo Penta D4-225A / D4-225I
- Volvo Penta D4-230A / D4-230I
- Volvo Penta D4-260A / D4-260D / D4-260I
- Volvo Penta D4-270A / D4-270I
- Volvo Penta D4-300A / D4-300D / D4-300I
- Volvo Penta D4-320A-G / D4-320I-G
- Volvo Penta D6-280 (selected configurations)
- Volvo Penta D6-300 / D6-310 / D6-330
- Volvo Penta D6-340 / D6-350 / D6-370
- Volvo Penta D6-380 / D6-400 / D6-435
- Volvo Penta D6-440 / D6-480
D6 fitment spans A, D, I, and waterjet configurations across multiple production generations. Confirm by engine serial number.
Serial Number Notice
Earlier D4 and D6 engines used predecessor tensioner numbers (21344508, 23272815, 24077907) before Volvo Penta consolidated service into 24542601. The exact changeover point varies by engine serial range. Always verify using the engine-specific Volvo Penta parts diagram before ordering.
When to Replace
- Belt tension is weak or inconsistent
- Tensioner pulley bearing is noisy, rough, or intermittent
- Tensioner arm binds or does not move smoothly through its travel range
- Pulley runs out of alignment with the belt
- Belt repeatedly slips despite being in serviceable condition
- Spring mechanism loses tension
- Excessive pulley or pivot play detected on inspection
Installation Notes
- Inspect the drive belt and all accessory pulleys before installing the replacement tensioner
- Check for pulley misalignment, bearing roughness, glazing, cracking, or oil contamination on the belt
- Use the Volvo Penta D4/D6 workshop procedure when releasing and reloading spring tension — do not force or pry the tensioner beyond its designed travel
- Replace the belt at the same time if worn or glazed — a new tensioner on a degraded belt will not restore correct performance
- Verify belt alignment and tensioner seating after installation before starting the engine
Part Number Cross-Reference
- Current OEM: 24542601
- Supersedes (direct): 21344508, 23272815, 24077907
- Additional earlier references (same family): 22774756, 22667563, 3583665, 3582694
- Supersession: 21344508 / 23272815 / 24077907 → 24542601
22774756, 22667563, 3583665, and 3582694 are associated with the same D4/D6 tensioner replacement family. Confirm by engine serial before ordering.
Technical FAQ
Q: My parts manual shows 21344508 or 23272815 — is 24542601 the right replacement?
A: Yes. 24542601 is the current Volvo Penta service part that replaces 21344508, 23272815, and 24077907. If your older catalog lists any of those numbers, 24542601 is the correct current replacement. Confirm availability with your dealer if in doubt.
Q: Does this tensioner fit both D4 and D6 engines?
A: Yes, 24542601 covers a broad range of D4 and D6 marine diesel applications. However, because it spans multiple production generations with different serial break points, confirming by engine serial number and the Volvo Penta parts diagram for your specific model remains important.
Q: How do I know if this is the accessory belt tensioner or the compressor belt tensioner?
A: 24542601 is the accessory / alternator belt tensioner. The D4 and D6 engines use a separate tensioner for the compressor belt — Volvo Penta Compressor Belt Tensioner 22171036. Confirm which belt circuit is affected before ordering.
Q: What is the service interval for the belt tensioner?
A: Volvo Penta does not publish a fixed tensioner replacement interval independent of the belt service. Inspect the tensioner pulley bearing and spring mechanism at every belt replacement service and replace the tensioner whenever bearing roughness, binding, or loss of tension is detected. On high-hour D4/D6 engines, proactive tensioner replacement at major service intervals is common practice.
Parts Desk Insights
Best use case: Order 24542601 when the alternator or accessory belt tensioner on a D4 or D6 shows bearing wear, loss of spring tension, or binding — or proactively during a major scheduled service on a high-hour engine. The broad D4/D6 coverage makes this the standard current-service tensioner for most of the product line.
Common issues: The most frequent mistake is ordering only the belt without replacing the tensioner when belt slip or slap has been the presenting symptom — a worn tensioner is often the root cause and the new belt will wear prematurely if the tensioner is left in place. Also confirm this is the accessory belt tensioner and not the compressor belt tensioner: the D4/D6 uses separate tensioners for each belt circuit, and ordering the wrong one is a common error on twin-belt engines.
Related Parts
Shipping information
In-stock and OEM parts: ship same or next business day.
Supplier-stock items are usually ready for pickup or shipping within 24 hours of ordering.
Special-order timing may vary.
Returns & warranty
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