Yamaha Inline 4 Cylinder Sleeve 3.310 OD Advanced Sleeve 1185SC

Specifications

Yamaha Inline 4-Cylinder Application

The Advanced Sleeve 1185SC is designed for compatible Yamaha inline 4-cylinder four-stroke powerheads.

Cylinder sleeves are typically used during major powerhead rebuilding when the original cylinder wall is too worn, scored, corroded, damaged, or previously machined beyond the point where a normal oversize piston repair is practical.

Alternate 3.270" OD Cylinder Sleeve

Advanced Sleeve 1185SA - 3.270" Outside Diameter

Alternate replacement sleeve for compatible Yamaha inline four-cylinder four-stroke powerheads.

Outside Diameter: 3.270"
Bore: 3.118"
Length: 5.195"

The 1185SA uses a .040" smaller outside diameter than the 1185SC while retaining the same nominal bore and length.

View 1185SA 3.270" OD Sleeve

1185SC vs. 1185SA Cylinder Sleeve

What a Replacement Cylinder Sleeve Does

A replacement cylinder sleeve restores the cylinder wall when the original bore is no longer suitable for normal rebuilding. The damaged cylinder area is machined to accept the replacement sleeve, allowing the block to be repaired instead of discarded.

Once installed, the sleeve is bored and honed to the correct finished size for the piston that will be used in the rebuilt engine.

When the 3.310" OD Sleeve May Be Used

The larger outside diameter of the 1185SC provides additional material for applications where the block has been machined larger, has suffered more extensive cylinder-wall damage, or requires the larger sleeve outside diameter during the repair process.

The machine shop should determine which sleeve outside diameter is appropriate after inspecting and measuring the block.

Common Reasons to Install a Cylinder Sleeve

• Deep piston or cylinder-wall scoring
• Broken piston or piston-ring damage
• Severe cylinder corrosion
• Excessive cylinder taper
• Excessive out-of-round condition
• Damage beyond available oversize piston dimensions
• Previously bored cylinder requiring restoration
• Major Yamaha powerhead rebuilding

Machine Shop Installation

Cylinder sleeve installation requires precision machining. The engine block must be measured and machined for the correct sleeve fit before installation.

After the sleeve is installed, the cylinder must be bored and honed to the proper finished dimension and piston-to-wall clearance for the piston being installed.

Standard or Oversize Piston After Sleeving?

One advantage of installing a replacement sleeve is that the machinist can finish the repaired cylinder for the piston size selected for the rebuild.

Depending on the engine, piston availability and condition of the remaining cylinders, the sleeved cylinder may be finished for a standard or compatible oversize piston.

Parts to Inspect During a Cylinder Sleeve Repair

• Pistons and piston size
• Piston rings
• Finished cylinder bore
• Piston-to-wall clearance
• Connecting rods
• Connecting rod bolts
• Connecting rod bearings
• Crankshaft main bearings
• Crankshaft journals
• Cylinder head and sealing surface
• Valves and valve stem seals
• Powerhead gaskets and seals

Shop Yamaha Engine Rebuild Parts by Model

Pro Marine stocks the internal engine components commonly needed alongside cylinder sleeves, including pistons, piston rings, crankshaft bearings, connecting rod bearings, valves, head gaskets and complete powerhead gasket kits.

Key Features and Benefits

• Advanced Sleeve aftermarket replacement cylinder sleeve
• Part number 1185SC
• Designed for compatible Yamaha inline 4-cylinder four-stroke engines
• 3.310" outside diameter
• 3.118" bore
• 5.195" overall length
• Larger OD option compared with 1185SA
• Can restore cylinders with severe bore damage
• Designed for professional machine-shop installation
• Can be finish-machined for the appropriate rebuild piston
• 1185SA 3.270" OD sleeve linked above
• Yamaha engine rebuild parts by model linked above

FAQ

What engines does Advanced Sleeve 1185SC fit?
It is designed for compatible Yamaha inline 4-cylinder four-stroke engines.

What is the outside diameter of 1185SC?
The 1185SC has a 3.310" outside diameter.

What is the bore size of 1185SC?
The listed bore is 3.118".

How long is the sleeve?
The sleeve is 5.195" long.

What is the difference between 1185SC and 1185SA?
The main difference is outside diameter. 1185SC is 3.310" OD, while 1185SA is 3.270" OD.

Are the bore and length the same on both sleeves?
Yes. Both sleeves are listed with a 3.118" bore and 5.195" length.

How much larger is the 1185SC outside diameter?
The 1185SC is .040" larger in outside diameter than the 1185SA.

How do I know which sleeve I need?
The engine block should be measured by the machine shop performing the repair. Sleeve selection is based on the block condition and required outside diameter, not simply horsepower.

Does the sleeve require machining after installation?
Yes. The installed sleeve must be bored and honed to the required finished size and piston clearance for the rebuild.

Where can I find the pistons, bearings and gaskets for my Yamaha?
Use the Yamaha Engine Rebuild Parts by Model section linked above.

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