Husqvarna 510916301 Piston Pin 8488B82600 – Genuine OEM Replacement Engine Component
Part Number: 510916301
Category: Small Engine, Piston & Crankshaft Components
Type: Piston Pin 8488B82600 – Genuine OEM Replacement Engine Component
The Husqvarna 510916301 Piston Pin 8488B82600 is a genuine OEM replacement engine component designed for select Husqvarna Group outdoor power equipment and compatible small-engine applications. Official Husqvarna Group illustrated parts documentation identifies 510916301 specifically as “PIN.PISTON” and shows it installed within the engine assembly alongside the piston, piston rings, bearing, cylinder, and crankshaft.
Product Specifications
- Part Number: 510916301
- Manufacturer: Husqvarna
- Product Type: Piston Pin
- OEM Description: PIN.PISTON
- Component Designation: 8488B82600
- Alternate Description: Wrist Pin / Gudgeon Pin / Engine Piston Pin
- Component Type: Internal Engine Component
- Primary Application: Small Gasoline Engine
- System: Cylinder / Piston / Crankshaft Assembly
- Function: Connects the Piston to the Connecting-Rod Assembly
- Compatible Equipment: Select Husqvarna Group Outdoor Power Equipment
- Installation Location: Inside Engine Piston Assembly
- Associated Components: Piston / Piston Rings / Retaining Rings / Connecting Rod / Bearing / Crankshaft
- Replacement Type: Direct OEM Replacement
- OEM Status: Genuine OEM Part
- Condition: New
- Quantity: 1 Piston Pin
- Part Number Reference: 510916301
- Component Reference: 8488B82600
- Alternate Number Format: 510 91 63-01
Official Husqvarna Group parts documentation specifies 510916301 PIN.PISTON with a quantity of one in compatible engine assemblies.
Features & Benefits
- Genuine OEM replacement piston pin
- Factory-designated PIN.PISTON
- Component designation 8488B82600
- Designed for compatible small-engine piston assemblies
- Connects the piston with the connecting-rod assembly
- Supports proper piston articulation during engine operation
- Helps transfer combustion force through the rotating assembly
- Application-specific OEM dimensions
- Designed for use with corresponding piston and bearing components
- Helps maintain proper internal engine alignment
- Suitable for replacing worn, scored, or damaged piston pins
- Direct replacement for equipment specifying 510916301
- Designed to maintain the original engine configuration
Piston Pin Function
The piston pin is a critical mechanical connection within a reciprocating engine.
During operation, combustion pressure forces the piston downward inside the cylinder. This linear piston movement must be transferred to the connecting rod and ultimately converted into crankshaft rotation.
The piston pin forms the connection between the:
Piston → Piston Pin → Connecting Rod → Crankshaft
This connection allows the connecting rod to pivot as the piston travels up and down through the cylinder.
Engine Assembly Location
Official Husqvarna Group engine diagrams position 510916301 directly alongside the major piston and crankshaft components.
For example, compatible engine assemblies document:
- Cylinder
- Cylinder gasket
- Crankcase
- Oil seals
- Piston
- Piston rings
- 510916301 Piston Pin
- Retaining rings
- Piston-pin bearing
- Crankshaft
- Ignition components
This confirms that 510916301 is an internal engine component within the piston/crankshaft assembly.
Piston & Pin Relationship
The piston pin passes through the applicable piston bosses and connecting-rod assembly, creating the pivot point necessary for engine operation.
As the crankshaft rotates:
- The connecting rod changes angle.
- The piston pin allows the required pivoting movement.
- The piston continues traveling vertically through the cylinder.
- Reciprocating movement is converted into crankshaft rotation.
Because the pin operates under repeated load and at high engine speeds, proper fit and surface condition are important.
Piston Pin Bearing
Official engine documentation shows a separate bearing used in the same assembly as 510916301. For example, compatible configurations list 576402701 Bearing adjacent to the piston pin and crankshaft components.
Whenever replacing the piston pin, inspect the corresponding bearing for:
- Roughness
- Excessive clearance
- Discoloration
- Scoring
- Missing or damaged rollers
- Heat damage
- Abnormal wear
A damaged bearing can quickly damage a replacement piston pin.
Piston Inspection
When replacing 510916301, carefully inspect the piston.
Check for:
- Scoring
- Cracks
- Excessive wear
- Damaged pin bores
- Heat discoloration
- Carbon buildup
- Distortion
- Seizure marks
- Excessive clearance
Official parts documentation identifies the piston as a separate component from 510916301, meaning the piston is not automatically included with the replacement pin.
Piston Ring Inspection
The piston rings should also be inspected while the engine is disassembled.
Check for:
- Broken rings
- Excessive wear
- Scoring
- Carbon buildup
- Rings stuck in their grooves
- Loss of tension
- Damaged piston ring grooves
Official engine diagrams show the piston rings as separate service components within the same engine assembly.
Retaining Ring Inspection
Piston pins commonly use retaining components to prevent unwanted lateral movement.
Official compatible engine diagrams list retaining rings separately alongside 510916301.
Inspect applicable retaining components for:
- Distortion
- Cracks
- Loss of tension
- Excessive wear
- Damage during removal
- Improper seating
Damaged retaining components should not be reused where replacement is required.
Crankshaft & Connecting Rod Inspection
Because the piston pin transfers force into the connecting rod and crankshaft, inspect the lower engine assembly when piston-pin damage is discovered.
Look for:
- Excessive connecting-rod play
- Bearing damage
- Rough crankshaft movement
- Heat discoloration
- Scoring
- Abnormal clearance
- Evidence of insufficient lubrication
Severe piston-pin wear can sometimes indicate a broader internal engine problem.
Common Reasons for Replacement
Replacement of the 510916301 Piston Pin may be appropriate if the original component has:
- Become scored
- Developed excessive wear
- Developed grooves
- Become discolored from excessive heat
- Sustained bearing damage
- Developed excessive clearance
- Become distorted
- Sustained engine seizure damage
- Developed damaged contact surfaces
- Been damaged during engine disassembly
- Become unsuitable for reuse during an engine rebuild
Possible Signs of Piston Pin or Internal Engine Wear
Depending on the engine and severity of the problem, internal piston-pin wear may contribute to:
- Abnormal engine knocking
- Mechanical tapping
- Excessive internal play
- Increased vibration
- Reduced engine performance
- Internal engine noise
- Piston instability
- Accelerated piston or bearing wear
These symptoms can also result from crankshaft, connecting-rod, piston, cylinder, bearing, or other internal engine problems.
Proper diagnosis is recommended before replacing individual internal components.
Cylinder Inspection
Whenever the piston assembly is removed, inspect the cylinder bore for:
- Scoring
- Scratches
- Transfer material
- Excessive wear
- Heat damage
- Cracks
- Abnormal discoloration
Installing a new piston pin into an engine with severe cylinder or piston damage may not correct the underlying problem.
Lubrication Importance
The piston pin and its associated bearing operate under repeated mechanical loading and require the lubrication provided by the engine's intended lubrication system.
Insufficient lubrication can contribute to:
- Excessive friction
- Overheating
- Scoring
- Bearing failure
- Piston-pin wear
- Connecting-rod damage
- Engine seizure
Always use the fuel, oil, and lubrication specifications required for the exact equipment and engine.
Installation Considerations
Before replacing 510916301:
- Shut down the equipment completely.
- Allow the engine and exhaust components to cool.
- Disconnect the spark plug.
- Drain fuel where required for safe engine disassembly.
- Remove the necessary engine covers and components.
- Access the cylinder and piston assembly.
- Note the original piston and retaining-ring orientation.
- Remove the applicable piston-pin retainers.
- Carefully remove the original piston pin.
- Inspect the piston-pin bearing.
- Inspect the piston and connecting rod.
- Inspect the cylinder and crankshaft assembly.
- Lubricate components as specified during assembly.
- Install the replacement 510916301 Piston Pin.
- Install the required retaining components correctly.
- Verify smooth piston and connecting-rod articulation.
- Reassemble the engine according to the applicable service procedure.
- Verify proper engine operation before returning the equipment to normal service.
Installation Precautions
During installation:
- Keep all internal engine components clean
- Prevent dirt from entering the crankcase
- Do not force the piston pin through misaligned components
- Avoid scratching the pin surface
- Inspect the pin bearing before reassembly
- Verify correct piston orientation
- Install retaining rings securely
- Avoid damaging the piston-pin bores
- Follow the specified lubrication procedure
- Replace damaged gaskets and seals as necessary during reassembly
Internal engine components require precise fit and alignment.
Important Notes
- Verify compatibility with your exact equipment model, product number, engine configuration, and production revision before ordering.
- Match part number 510916301 directly with the applicable OEM illustrated parts documentation.
- Official Husqvarna Group documentation identifies 510916301 as “PIN.PISTON.”
- The associated component designation is 8488B82600.
- This is an internal engine piston component.
- It is not a general-purpose equipment pin.
- The piston is a separate component.
- The piston rings are separate components.
- The piston-pin retaining rings are separate components.
- The piston-pin bearing is a separate component.
- Official engine documentation shows each of these components separately within compatible assemblies.
- Use 510916301 as the primary fitment reference.
- Do not select a replacement piston pin solely by approximate diameter or length.
- Piston pins can differ in diameter, length, surface finish, material, and engine application.
- Do not grind, shorten, or otherwise modify the piston pin.
- Inspect the piston-pin bearing whenever replacing the pin.
- Inspect the piston pin bores for excessive wear.
- Check the connecting rod for abnormal play or damage.
- Inspect the piston and cylinder for scoring.
- Determine the cause of any severe heat or seizure damage before reassembly.
- Keep all internal engine components exceptionally clean during service.
- Make sure retaining rings are correctly seated before reassembling the cylinder.
- Replace damaged gaskets and seals separately as required.
- Follow the applicable engine service procedure and torque specifications during reassembly.
- Disconnect the spark plug and safely handle fuel before performing internal engine repairs.
- This listing is for one Husqvarna 510916301 Piston Pin 8488B82600 only unless otherwise specified. Piston, piston rings, retaining rings, bearing, cylinder, crankshaft, gaskets, seals, and other engine components are sold separately unless explicitly included.
- Match 510916301 with your equipment's OEM parts documentation before ordering to ensure proper fitment.
