Description
Overview:
The Gasket Cylinder Base Gasket for Husqvarna 545 Mark II chainsaws is a Genuine Husqvarna OEM seal for the joint between the cylinder and crankcase. Precision-cut from durable metal, it creates a tight, reliable seal to maintain compression and prevent air, fuel, and oil leaks that can harm performance. It is designed specifically for modern Husqvarna petrol chainsaws, including the 545 Mark II and 550XP Mark II, providing correct hole positions and edge profiles for a proper fit. Using the correct OEM gasket helps your saw start reliably, idle cleanly, and deliver consistent power, especially after top-end service or rebuilds. Part reference: 591 17 74 01 (also written as 591177401).
Key Features:
- Genuine Husqvarna OEM part for assured compatibility and build quality (MPN: 591 17 74 01 / 591177401).
- Forms a secure cylinder-to-crankcase seal to maintain correct engine compression.
- Durable metal construction resists heat cycles, vibration, and contact with petrol and oil.
- Precision-cut profile for accurate bolt hole and port alignment on Mark II engines.
- Helps prevent air leaks that cause hard starting, erratic idle, or lean running.
- Supports smooth operation and engine longevity when rebuilding or servicing the top end.
- Flat, clean profile for straightforward fitting with standard hand tools.
- Suitable as a like-for-like replacement during scheduled maintenance or after damage.
Typical Applications:
Used when refitting the cylinder during piston or ring replacement, after a seizure, or any top-end overhaul on applicable Husqvarna chainsaws. Ideal for professional arborists, forestry teams, landscapers, and informed DIY users who need a dependable OEM seal to restore correct engine performance and compression after service.
Also known as:
Cylinder base seal, base gasket, cylinder-to-crankcase gasket, cylinder shim, engine base seal, crankcase top gasket.
Fits Models:
545 Mark II
545G Mark II
550XP Mark II
550XPG Mark II
Alternate Part Numbers:
591 17 74-01, 591177401
Product Specifications
| L&S Part No. | 591 17 74 01 |
|---|---|
| Part Type | Genuine Part |
| Manufacturer | Husqvarna |
| OEM No. | 591177401 |
| Unit of Sale | 1 |
| Applications | 545 Mark II, 545G Mark II, 550XP Mark II, 550XPG Mark II |
| Machine Type | Chainsaws |
| Fits Brands | Husqvarna |
| Fits Models | 550XP Mark II | 545 Mark II | 545G Mark II | 550XPG Mark II |
