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Mercury 450R V8 Replacement Belt
Mercury 8M0159595 Belt
The Mercury 8M0159595 Belt is a replacement belt for compatible Mercury 450R V8 belt drive systems. A worn or damaged belt can cause squealing, slipping, charging issues, overheating concerns, or poor accessory drive performance.
When replacing this belt, inspect the belt tensioner and pulley assembly at the same time. The related Mercury 8M0164060 tensioner assembly is linked below.
Compatible Applications
| Engine / Application | Part Number |
|---|---|
| Mercury 450R V8 belt drive system | 8M0159595 |
Verify your engine serial number and original belt part number before ordering. Mercury belt lengths and belt drive components can vary by model and serial range.
OEM & Cross Reference Numbers
| Type | Part Number |
|---|---|
| Mercury OEM | 8M0159595 |
Related Tensioner Assembly
Mercury 8M0164060 Tensioner Assembly
If the belt is worn, slipping, squealing, or tracking incorrectly, inspect the tensioner assembly as well. A weak or noisy tensioner can shorten belt life and cause repeat belt problems.
What This Part is Used For
The engine belt transfers power through the belt drive system to related engine accessories. Proper belt condition is important for quiet operation, correct pulley tracking, and dependable accessory drive performance.
A belt should be replaced if it shows cracks, glazing, fraying, uneven wear, contamination, slipping, or noise. Because the belt works directly with the tensioner and pulleys, those parts should be inspected during the same service.
Key Features and Benefits
- Mercury OEM replacement belt
- Part number 8M0159595
- Used on compatible Mercury 450R V8 belt drive systems
- Helps restore proper belt drive operation
- Recommended replacement when the belt is cracked, glazed, noisy, or slipping
- Related Mercury 8M0164060 tensioner assembly linked above
- Good service practice is to inspect the belt, tensioner, and pulleys together
Common Signs of Belt Wear
| Symptom | What to Check |
|---|---|
| Squealing or chirping | Worn belt, weak tensioner, pulley alignment, or contamination |
| Cracks or fraying | Replace the belt and inspect pulley surfaces |
| Glazed belt surface | Slipping belt, weak tensioner, or worn pulley contact |
| Uneven belt wear | Misalignment, tensioner wear, or pulley damage |
| Repeat belt failure | Inspect tensioner assembly and pulley system before installing another belt |
FAQ
What is the OEM number for this belt?
The OEM part number is 8M0159595.
What engine is this belt commonly used on?
This belt is listed for compatible Mercury 450R V8 belt drive systems.
Should I replace the tensioner when replacing the belt?
Not always, but the tensioner should be inspected during belt service. If the
tensioner is weak, noisy, binding, or the pulley is worn, replace it with the
related 8M0164060 tensioner assembly.
Can a bad tensioner damage a new belt?
Yes. A weak, worn, or misaligned tensioner can cause slipping, noise, uneven
wear, and premature belt failure.
When should this belt be replaced?
Replace the belt if it is cracked, frayed, glazed, contaminated, slipping,
noisy, or showing uneven wear.
Do I need to verify fitment?
Yes. Always verify your engine serial number and original belt part number
before ordering.
Dealer Discounts & Store Policies
Dealer / Marine Industry Discounts
Are you a marine dealer, technician, boat builder, or industry professional? We offer dealer pricing for qualified marine businesses.
Shipping Policy
- Free shipping on orders over $100 continental U.S.
- Orders ship via UPS, USPS, and FedEx.
- Orders received before 5:30 PM EST ship the same business day.
- Typical delivery time is 1-5 business days.
30-Day Return Policy
- Returns accepted within 30 days of delivery.
- Parts must be new, unused, and in original packaging.
- Installed parts are not returnable.
- Return authorization is required before sending items back.
Need help with a return or order question?
Contact Us
Phone: 941-721-3000
Searchable Terms
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Mercury Belt Tensioner Assembly
Mercury 8M0164060 Tensioner Assembly
The Mercury 8M0164060 Tensioner Assembly is used in the belt drive system to help maintain proper belt tension and pulley alignment. A worn tensioner or pulley can lead to belt noise, slipping, uneven belt wear, or charging and accessory drive issues.
When replacing this tensioner assembly, it is usually a good idea to inspect and replace the belt at the same time. The related Mercury 8M0159595 belt is linked below.
Compatible Applications
| Engine / Application | Part Number |
|---|---|
| Mercury 450R V8 belt drive system | 8M0164060 |
Verify your engine serial number and original tensioner part number before ordering. Mercury belt drive components can vary by model and serial range. The related belt listed by Pro Marine is identified as fitting Mercury 450R V8.
OEM & Cross Reference Numbers
| Type | Part Number |
|---|---|
| Mercury OEM | 8M0164060 |
Related Belt Replacement
Mercury 8M0159595 Belt - Mercury 450R V8
It is common to replace the belt when servicing the tensioner or pulley. A worn belt can cause slipping, noise, poor charging performance, or premature wear on the new tensioner assembly.
What This Part is Used For
The belt tensioner assembly keeps proper tension on the engine belt so the belt can drive related engine accessories correctly. If the tensioner weakens, binds, or the pulley wears out, the belt may slip, squeal, track incorrectly, or wear faster than normal.
Replacing the tensioner assembly helps restore proper belt control. Because the belt rides directly on the pulley system, replacing the belt during the same service is often recommended.
Key Features and Benefits
- Mercury OEM tensioner assembly
- Part number 8M0164060
- Helps maintain correct belt tension
- Supports proper belt tracking and accessory drive operation
- Useful when repairing belt noise, slipping, or pulley wear
- Related Mercury 8M0159595 belt linked above
- Recommended to inspect or replace the belt during tensioner service
Common Signs of a Worn Tensioner or Belt
| Symptom | Possible Cause |
|---|---|
| Belt squeal or chirping | Weak tensioner, worn pulley, glazed belt, or misalignment |
| Visible belt wear | Pulley wear, improper tracking, or old belt |
| Belt slipping | Loss of tension or worn belt surface |
| Pulley noise | Worn bearing or damaged tensioner pulley |
FAQ
What is the OEM number for this tensioner?
The OEM part number is 8M0164060.
Should I replace the belt when replacing the tensioner?
Yes, it is usually recommended to inspect and replace the belt when servicing
the tensioner or pulley, especially if the belt shows wear, glazing, cracking,
noise, or slipping.
Which belt goes with this tensioner?
The related belt is Mercury 8M0159595, linked above.
What does the tensioner assembly do?
It keeps the engine belt under proper tension so the belt can drive related
engine accessories correctly.
Can a bad tensioner damage a new belt?
Yes. A worn or misaligned tensioner can cause premature belt wear, belt noise,
or belt tracking problems.
Do I need to verify fitment?
Yes. Always verify your engine serial number and original part number before
ordering Mercury belt drive components.
Dealer Discounts & Store Policies
Dealer / Marine Industry Discounts
Are you a marine dealer, technician, boat builder, or industry professional? We offer dealer pricing for qualified marine businesses.
Shipping Policy
- Free shipping on orders over $100 continental U.S.
- Orders ship via UPS, USPS, and FedEx.
- Orders received before 5:30 PM EST ship the same business day.
- Typical delivery time is 1-5 business days.
30-Day Return Policy
- Returns accepted within 30 days of delivery.
- Parts must be new, unused, and in original packaging.
- Installed parts are not returnable.
- Return authorization is required before sending items back.
Need help with a return or order question?
Contact Us
Phone: 941-721-3000
Searchable Terms
8M0164060, Mercury 8M0164060, Mercury tensioner assembly, Mercury belt tensioner, Mercury pulley tensioner, Mercury 450R tensioner, Mercury 450R V8 tensioner, Mercury Racing 450R tensioner, Mercury belt drive tensioner, outboard belt tensioner, Mercury belt pulley, 8M0159595, Mercury 8M0159595, Mercury 450R V8 belt, Mercury belt replacement, tensioner and belt replacement
8M6003035
885349500
8M0218433
8M0235013
60508
883471T
8M6005030
835-410
852385A1
852385A1
852385A1
852385A2
880566Q14
880566014
8285071
8M0232583
880566Q14
880566014
8M0026410
892318