SKU: 15236356933

21407026 Serpentine Belt for Volvo Penta D4-260 D6-350 D6-370 | JLM Marine

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Description

21407026 Serpentine Belt for Volvo Penta D4-260 D6-350 D6-370 | JLM Marine21407026 Serpentine Belt for Volvo Penta D4 260 D6 350 D6 370 JLM Marine This high quality serpentine belt is engineered to fit Volvo Penta D4 and D6 diesel engines, including the D4 260 and D6 350 D6 370 series. Designed for marine compressor and alternator drive applications, this belt ensures reliable power transmission in demanding marine environments. This belt directly replaces OEM part numbers 21407026 and 3583963, offering a precise fit and

21407026 Serpentine Belt for Volvo Penta D4-260 D6-350 D6-370 | JLM Marine

This high-quality serpentine belt is engineered to fit Volvo Penta D4 and D6 diesel engines, including the D4-260 and D6-350/D6-370 series. Designed for marine compressor and alternator drive applications, this belt ensures reliable power transmission in demanding marine environments.

This belt directly replaces OEM part numbers 21407026 and 3583963, offering a precise fit and dependable performance for your Volvo Penta inboard diesel engine.

  • Direct replacement for Volvo Penta compressor/alternator serpentine belt
  • Compatible with D4-260 and D6-350/D6-370 engine families
  • Engineered for marine-grade durability and performance

Part Number Cross-Reference

Use this table to confirm equivalent part numbers across OEM and aftermarket brands.

Brand Part Number
Volvo Penta 21407026
Volvo Penta 3583963

Compatible Engine Models

Confirm your engine model/year in the table below.

Brand Model
Volvo Penta D6-350A-A
Volvo Penta D6-350A-B
Volvo Penta D6-370A-B
Volvo Penta D6-370A-C
Volvo Penta D6-370A-D
Volvo Penta D6-370A-E
Volvo Penta D6-370D-B
Volvo Penta D6-370D-C
Volvo Penta D6-370D-D
Volvo Penta D6-370D-E
Volvo Penta D4-260A-A
Volvo Penta D4-260A-B
Volvo Penta D4-260A-C
Volvo Penta D4-260A-D
Volvo Penta D4-260A-E
Volvo Penta D4-260D-B
Volvo Penta D4-260D-C
Volvo Penta D4-260D-D
Volvo Penta D4-260D-E

Technical Specifications

Specification Value
OEM Part Number 21407026, 3583963
Application Compressor/Alternator Drive Belt
Engine Type Volvo Penta D4 & D6 Diesel

Package Contents

  • 1 × Serpentine Belt (Replaces 21407026 / 3583963)

Installation Guide

  1. Disconnect the battery negative terminal to ensure safety during installation.
  2. Locate the serpentine belt routing diagram on your engine or consult your service manual.
  3. Release tension on the belt tensioner using the appropriate tool (typically a wrench or socket on the tensioner bolt).
  4. Remove the old serpentine belt from all pulleys, noting the routing path.
  5. Inspect all pulleys and the tensioner for wear, damage, or excessive play; replace if necessary.
  6. Route the new serpentine belt around all pulleys following the correct path as per the diagram.
  7. Ensure the belt is properly seated in all pulley grooves with no twists or misalignment.
  8. Release the tensioner slowly to apply proper tension to the new belt.
  9. Verify that the belt is correctly positioned on all pulleys and moves freely.
  10. Reconnect the battery negative terminal.
  11. Start the engine and observe the belt operation, listening for any unusual noises or slippage.
  12. Re-check belt alignment and tension after the first few hours of operation.

Troubleshooting & FAQ

Q: How do I confirm this serpentine belt fits my Volvo Penta engine?
A: Check the compatible engine models table above to verify your specific D4 or D6 engine variant is listed. Also confirm that your original belt has the OEM part number 21407026 or 3583963 stamped on it.

Q: How often should I replace the serpentine belt on my Volvo Penta diesel?
A: Volvo Penta typically recommends inspecting serpentine belts every 200 operating hours and replacing them every 800–1,000 hours or sooner if signs of wear, cracking, or fraying appear. Always consult your engine's service manual for specific intervals.

Q: What are the signs that my serpentine belt needs replacement?
A: Common indicators include squealing or chirping noises during engine operation, visible cracks or glazing on the belt surface, fraying edges, loss of accessory function (alternator, compressor), or visible belt slippage on pulleys.

Q: Can I install this belt myself or do I need a mechanic?
A: If you have basic mechanical skills and the correct tools to release the belt tensioner, installation can be done yourself following the routing diagram. However, professional installation is recommended to ensure proper tension and alignment.

Q: Is this an OEM belt or an aftermarket replacement?
A: This listing is an aftermarket replacement part (not an OEM component). We build to OEM specifications using comparable-grade materials. Production is done in an ISO9002-certified facility, and each batch is inspected for consistent performance.

Q: How fast do you ship and how much does it cost?
A: We offer fast global shipping—typically 5–15 days worldwide—and standard shipping is free. Expedited options are available at checkout depending on your location.

Q: What is your warranty and return policy?
A: This product includes a 1-year warranty against manufacturing defects under normal use. If something goes wrong, contact our support team with your order details. Returns are accepted within our standard return window (unused & in original condition); please see our policy page or reach out for instructions.

Important Notes

  • Verify that the product images and specifications match your original part. If discrepancies exist—even if your model is listed—do not proceed with the purchase.
  • This product is an aftermarket replacement part and is not an OEM component.
  • Professional installation is recommended to ensure safety and optimal performance.

Why Choose JLM MARINE?

  • Quality Assured: As a trusted manufacturer for over 20 years, we supply top marine brands globally.
  • Fast Global Shipping: Free delivery worldwide in 5–15 days.
  • Direct from Manufacturer: Competitive pricing without compromising quality.
Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 15236356933

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4.1 ★★★★★
Based on 16 reviews
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Verified Purchase
Britney
New York, US
★★★★★ 5
I have purchased this for everyone!!!
Size: Twin, Color: White
I cannot express how perfect this comforter is. I have purchased one for every room- even the dog! It’s fluffy but not too hot. Does not attract lint, washes perfectly everytime- no pilling. The price for the quality is unmatched. I recommend this 100%
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 26, 2026
J
Verified Purchase
John cromwell
Grantham, US
★★★★★ 5
Finally we BOTH can sleep comfy!
Color: 08 - Black, Size: Queen
So for years my boyfriend has always liked “jersey sheets” or “tee shirt” sheets or sheets made of flannel. He says he doesn’t like the feeling of cold “silky” feeling sheets as he’s always cold. I’m opposite and am always hot, and anytime we stayed in a nice hotel I looked forward to being able to sleep on cooler, taught, soft sheets for a couple of nights. I was able to deal with our old sheets but the issue we both hated was after awhile any sheet we got would get pilling. We even splurged and got a $60 flannel sheet which did the same thing forcing me to shave off these little annoying fuzz balls that make it feels like there is thousands of crumbs on the sheets. I also would wash our bedding once a week because the Jersey sheets seemed to “grow” as we move around in bed making it so the sheet was not taught and super annoying to lay on. The day I would wash them they would be comfortable but ultimately by the end of the week they would be almost hanging off our mattress. I ordered these sheets on a whim and got them the same day and immediately just threw out the jersey sheet and put this on (I didn’t even wash it, I know it’s gross but I was desperate for a comfy nights sleep and they came around 8pm) when I put them on I realized how soft and comfortable they felt. I also liked how the pillow cases are larger than most pillow cases that I have had in the past. We’ve been using these sheets for about a week and I love how I don’t wake up with my pillow popping out of the case anymore. The sheets have loosed ever so slightly since a week of sleeping but still are really taught and comfortable. They are cooler than flannel or fabric sheets and are initially cold when you first lay on them but I wouldn’t consider them “cooling” but they keep me from feeing extremely hot. They are way better than I ever would have expected for the price. I look forward to laying on them at the end of each day, even my boyfriend laid in bed the day I got them and said “wow I didn’t think I would like sheets like this, these are so soft!” And fell asleep immediately. We ended up ordering a second set in grey and the color is pretty. I still have yet to wash them, I usually use 2 tide pods when washing the bedding but I might get some fabric softener (as I hear it helps with pilling) to prevent the possibility of having that happen to these sheets in the future. I am hoping they hold up well after the wash and longer use. If they start to pill after wash, I will come back and update my review. Until then, I would highly recommend these sheets for the quality and the price point that they are offered at. Honestly, at this point even if they pill months from now I probably wouldn’t even be upset as long as they stay the same price I would just buy another set as they are just that comfortable and soft. UPDATE: So it has been about 3 months since I have purchase and used these sheets. They are still as soft as the day I first put them on. I’ve been washing them bi-weekly along with my comforter and pillowcases. I wash them with warm water using a combination of tide pods and added Downy fabric softener. They say to hang dry them in the description but I have been putting them in the dryer on medium and have been taking them out after around 20-25 minutes, they seem to dry extremely quickly. They have yet to have absolutely any pilling and also have not shrunk or stretched. Also I have a cat that is very active and also sleeps with me who enjoys kneading on my bed and I haven’t even noticed any signs of wear what so ever to the eye or to the feel. I highly recommend these sheets. I still have yet to even open the second set I purchased!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on January 10, 2024
J
Verified Purchase
Joy Joy
San Leandro, US
★★★★★ 5
Happy With Our Purchase
Color: 07 - Charcoal, Size: King, Color: 07 - Charcoal, Size: King
When we opened the package the sheets were soft. We wash everything before we use it, so in these went. The sheets held nicely through the washing machine, the edges stayed sewn up and the sheets are still fluffy. The sheets fit nicely on our bed and have a nice cooling effect in this 80-degree weather. We think these sheets were a quality purchase that was affordable.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on June 6, 2026
M
Verified Purchase
Marcus
Draper, US
★★★★★ 5
Honest Review
Color: 25 - Burgundy, Size: Queen
Very good product, I would highly recommend it. It is soft and keeps you cool throughout the night. I am someone who burns hot all day and night so these sheets have been a great purchase so far as I can tell. I got the red ones and they are very nice and pleasing to the eye. The quality of the sheets is high and not to bad for the price considering other products. It’s not very elastic so make sure you purchase the right size. You get 2 pillow cases and 2 sheets. The sheets seem pretty durable as well which is nice.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on June 8, 2026
J
Verified Purchase
jeniene
Lexington, US
★★★★★ 4
Utopia bedding is GREAT
Color: 15 - Sage Green, Size: King
I had never heard of Utopia before I suddenly needed to buy bedding for my adult autistic son. He has sensory issues so shopping for anything that touches his body is a bit of a nightmare. I took a gamble on these sheets but it paid off big time! He says they are the most comfortable sheets he has ever slept on and that he doesn't overheat sleeping in them. What I liked about them is that the pockets were deep enough that it fit on his oversized plush mattress easily. I love the color and the ones I bought were very true to the picture. These are soft, comfy, they look nice and they are affordable. I liked this brand so much that I went ahead and got pillows and a comforter from them as well. Its is great for my son and I am very pleased to have found a fabric he tolerates.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 16, 2026

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