Volvo Penta Alternator V-Belt 977542 | KAD KAMD TAMD Marine Diesel
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Part Details
- Part Number: 977542
- Brand: Volvo Penta
- Type: V-belt — alternator / generator drive
- System: Alternator drive — separate from circulation-pump and supercharger belts on the same engines
- Approximate Size: 13 × 992 mm (confirm from Volvo Penta parts diagram)
- Weight: Approx. 0.15 kg
About This Part
Genuine Volvo Penta 977542 is an OEM V-belt used in the alternator drive on selected Volvo Penta KAD, KAMD, and TAMD marine diesel engines. Parts references specifically place 977542 in the alternator/generator drive position — it is not the circulation-pump belt or the supercharger belt, which are separate parts on many of the same engines. On engines such as the KAD42P-A, three different belts serve three different accessories; ordering by engine family alone without confirming the accessory position is the most common source of wrong-belt orders on these engines. Always confirm engine model, serial number, and belt position from the Volvo Penta parts diagram before ordering.
Compatible Applications
- Volvo Penta KAD32P / KAD32P-A — alternator belt position (confirm serial-number range from diagram)
- Volvo Penta KAD42A / KAD42B / KAD42P-A — alternator belt position
- Volvo Penta KAMD42A / KAMD42B / KAMD42P-A — alternator belt position
- Volvo Penta TAMD42B / TAMD42WJ-A — alternator belt position
- Volvo Penta KAD43P-A / KAD43P-B — alternator belt position
- Volvo Penta KAMD43P / KAMD43P-A / KAMD43P-B — alternator belt position
- Volvo Penta KAD44P / KAD44P-A / KAD44P-B / KAD44P-C — alternator belt position
- Volvo Penta KAMD44P-A / KAMD44P-B / KAMD44P-C — alternator belt position
- Volvo Penta KAD300-A — alternator belt position
- Volvo Penta KAMD300-A — alternator belt position
Belt arrangements can vary by engine version and serial number. Always confirm engine model, serial number, and the specific alternator belt position in the Volvo Penta parts diagram before ordering.
When to Replace
Replace the alternator belt if any of the following are present:
- Cracking, fraying, or missing material on the belt body
- Glazed or hardened belt surface
- Excessive wear or narrowing of the belt profile
- Persistent belt squeal under load
- Difficulty maintaining correct tension after adjustment
- Visible contamination from oil or coolant
A worn or slipping alternator belt reduces alternator output and can affect battery charging and onboard electrical systems during operation.
Service Notes
Inspect the alternator pulley, crankshaft pulley, belt alignment, and tensioning components during replacement. Set belt tension following the applicable Volvo Penta workshop procedure for your engine model and serial range. Re-inspect belt condition and tension after the first hour of operation following installation.
Important: Do not confuse 977542 with the other belts on the same engine. On KAD/KAMD installations, the alternator belt (977542), circulation-pump belt, and supercharger belt are all separate items. Confirm which position needs service from the parts diagram before ordering.
Related Parts
- Volvo Penta Drive Belt 861564 — Marine Engine Circulation Pump Belt (separate belt on KAD/KAMD engines)
- 860388 — Supercharger drive belt (separate belt on KAD/KAMD engines with supercharger)
Cross-Reference Part Numbers
- OEM: 977542
- Aftermarket cross-reference only (not OEM supersessions): Gates 9390 / 9390HD, 18542
- Note: No confirmed Volvo Penta OEM superseding number identified. Aftermarket numbers are cross-references only and should not be treated as Volvo Penta replacements.
Parts Desk Insight
The most common ordering mistake on KAD and KAMD engines is selecting a belt by engine family without specifying the accessory position. Many of these engines run two or three separate V-belts for the alternator, circulation pump, and supercharger — and they sit close together on the front of the engine, making them easy to confuse during service. 977542 is specifically the alternator drive belt. If you are replacing all belts as a set during a scheduled service, order each position separately from the Volvo Penta diagram to avoid duplication or gaps.
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
Returns & Satisfaction Guarantee
We stand firmly behind the quality of every product we sell. Your confidence matters to us — and we back it with a straightforward 30-Day Satisfaction Guarantee.
If you are not fully satisfied, you may request a return within 30 days of delivery. All returns must receive pre-approval prior to being sent back. Unauthorized returns will not be accepted.
To qualify for a return:
Item must be in new, unused condition
Product must be in its original packaging
All parts, components, hardware, manuals, and accessories must be included
Packaging must be undamaged and suitable for resale
Important:
Electronics are strictly inspected. No returns on open-box electronics. Exceptions may apply only with prior written approval. Any electronic unit that has been installed, powered, activated, or altered may not be eligible for return.
We are serious about product integrity — and equally serious about taking care of our customers. If there is ever a product issue, contact us immediately so we can make it right.
For return authorization, please contact our support team before shipping anything back.