804146 Mercury Tensioner | Genuine Used Part
804146 Mercury Tensioner | Genuine Used Part
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🔧 Product Description
Genuine Mercury Four-Stroke Timing Belt Tensioner - Part Number: 804146
A genuine used Mercury timing-belt tensioner for selected Yamaha-derived Mercury and Mariner 75HP to 115HP four-stroke outboard motors.
The spring-loaded tensioner maintains the specified tension on the camshaft timing belt, helping keep the crankshaft and camshafts correctly synchronised throughout the engine-speed range.
⚙️ Key Features
- Genuine used Mercury OEM timing-belt tensioner
- Correct part number 804146
- Used with Mercury timing belt 57-804145
- Supports correct camshaft and crankshaft timing
- Suits selected 75HP to 115HP four-stroke engines
🚤 Compatibility
Commonly used on
- Yamaha-derived Mercury and Mariner four-stroke timing-belt systems
- Inline four-cylinder EFI and carburetted four-stroke powerheads
Typically suits
- Engine models:
- Mercury / Mariner 75HP four-stroke - serial 0G960500 to 0T800999
- Mercury / Mariner 75HP four-stroke - serial 0T801000 to 1B226999
- Mercury / Mariner 75HP Bodensee four-stroke - corresponding serial groups
- Mercury 75HP EFI - serial 1B172291 to 1B366822
- Mercury 80HP EFI - serial 1B227000 to 1B366822
- Mercury / Mariner 90HP four-stroke - serial 0G960500 to 0T800999
- Mercury / Mariner 90HP four-stroke - serial 0T801000 to 1B226999
- Mercury 90HP EFI - serial 1B172291 to 1B366822
- Mercury 100HP EFI - serial 1B227000 to 1B366822
- Mercury 115HP EFI - serial 0T178500 to 0T800999
- Mercury 115HP EFI - serial 0T801000 to 1B226999
- Mercury 115HP EFI - serial 1B227000 to 1B366822
- HP Range: 75HP - 115HP
- Engine Type: Mercury / Mariner inline four-cylinder four-stroke outboard
- Year Range: Approximately 1999-2006
🔌 Function
The tensioner applies controlled pressure to the timing belt so the camshafts remain synchronised with the crankshaft.
⚠️ Common Signs of Failure
- Timing belt becomes loose or flaps during operation
- Tensioner bearing produces a grinding or rattling noise
- Engine timing becomes unstable
- Belt wears unevenly or moves off-centre
- Tensioner arm is seized or spring pressure is weak
- Engine suffers severe internal damage after belt disengagement
🔄 Supersession & Cross Reference
OEM Supersession Chain
- 804146 current original OEM tensioner reference
OEM / Related Numbers
- 804146
- 804146T
- 57-804145 related timing belt
- 804147 related tensioner spring
- 804143 related mounting bolt
- 804149 related valve plate
- 804150 related bolt
- 804153 related key
- 745061272552
Aftermarket / Verified Equivalents
- No aftermarket equivalent
📦 Condition
- Genuine used part
- Removed from running engine where applicable
- In good working condition unless otherwise stated
Shipping & Delivery
Shipping & Delivery
Flat-rate shipping Australia-wide — $14.99 per order, no matter how many parts you add. Orders dispatch from our Kadina, South Australia store. Need it urgently or want to collect in person? Call us on 0412 532 984 before ordering.
Returns & Warranty
Returns & Warranty
14-day change-of-mind returns — if it's not right or you ordered the wrong part, send it back within 14 days in the condition you received it for a refund or exchange. Full details in our Refunds & Returns policy.
Not sure this fits?
Not sure this fits?
Ask us before you buy — we check part numbers and fitment every day. Call 0412 532 984 (Mon–Fri 8.30am–4.30pm) or message us through the contact page with your engine or vehicle details.
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