S2K Commerce - Products Dropdown
Actions
S2K Commerce - Order Entry
Actions
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
8M0159115
8M0238746
8M0235013
F7778A9
5524A1
7778A1
7778A12
7778A3
7778A6
7778A7
7778A9
826866A2
60508
18-5791
19052A3
19052A5
19052A8
9-25108
18736A14
18736A15
18736A20
18736A3
18736A8
2803A3
2803A4
2910A1
2910A3
2915A3
2986A10
2986A17
2986A21
2986A22
2986A23
2986A24
2986A25
2986A27
2986A3
2986A4
2986A5
2986A7
2986A8
2986A9
78614A1
2803A4
2986A5
332-2803
332-2803A3