Outdrive - OMC

Gen III Oval Riser Gasket (Sold Each)

If you find yourself in need of maintenance accessories - we've got them! Gaskets, Clamps, Manifolds, Sealers.  We've got it all!

Gen III Oval Riser Gasket Open Center (Sold Each)

If you find yourself in need of maintenance accessories - we've got them! Gaskets, Clamps, Manifolds, Sealers.  We've got it all!

Gen III Tailpipe Gasket (Sold Each)

If you find yourself in need of maintenance accessories - we've got them! Gaskets, Clamps, Manifolds, Sealers.  We've got it all!

Hardin Manifold to Riser Gasket, Replaces Mercury OEM# 27-848147

Fits: BBC, SBC and Ford manifolds as well. For Gil Replacement, Mercury HP500 and Cyclone Manifold applications.

Original quality Hardin gaskets are the finest anywhere Their graphite impregnated core assures long life. Depending on application up to 2 or 4 may be required on a single engine. When using a turbolator (See related parts) 4 are required.

• For Log Manifolds 
• 5" Outside Diameter 
• 3" Inside Diameter 
• 2-15/16" Bolt Hole to Bolt Hole (Adjacent)
• 4-1/8" Bolt Hole to Bolt Hole (Across)
• Sold Each
• Metal Plate

• For Log Manifolds 
• 5" Outside Diameter 
• 3" Inside Diameter 
• 2-15/16" Bolt Hole to Bolt Hole (Adjacent)
• 4-1/8" Bolt Hole to Bolt Hole (Across)
• Sold Each

Mercury 3" and 4" Restricted Flow Riser/Elbow Gasket replaces MerCruiser part # 27-860233

Exhaust Elbow Gaskets have side leakage-proof treatment and sticking proof treatment.

• Temperature Limit: 1112 F
• Thickness: 1/16 Inch
• Density of Sheet:1.309 / cm3
• Compressibility: 15-35%
• Recovery: 20% Min.
• Bolt Holes measure 3-7/16" center to center lengthwise and 3-1/16 center to center width wise. 
• Restricted water flow.

Mercury 3" and 4" Open Riser/Elbow Gasket replaces MerCruiser part # 27-863726

Exhaust Riser/Elbow Gaskets have side leakage-proof treatment and sticking proof treatment.

• Fits 1983-2002 V6 and V8, 3" or 4" riser.
• Temperature Limit: 1112 F
• Thickness: 1/16 Inch
• Density of Sheet:1.309 / cm3
• Compressibility: 15-35%
• Recovery: 20% Min.
• Bolt Holes measure 3-7/16" center to center lengthwise and 3-1/16 center to center width wise. 
• Open gasket for standard cooling riser.

Mercury 3" and 4" Blocked Flow Riser/Elbow Gasket replaces MerCruiser part # 27-860231

Exhaust Elbow Gaskets have side leakage-proof treatment and sticking proof treatment.

• Temperature Limit: 1112 F
• Thickness: 1/16 Inch
• Density of Sheet:1.309 / cm3
• Compressibility: 15-35%
• Recovery: 20% Min.
• Bolt Holes measure 3-7/16" center to center lengthwise and 3-1/16 center to center width wise. 
• Blocks water flow for Closed Cooling applications

Interchanges/Replaces

GLM

• 39630

Mallory

• 9-62605

OMC Stern Drive

• 508105

List of Containing Parts

Sierra Item #	OE/Competitor #	Quantity	Description	Image	Comments
18-2918	GLM 34730 Mallory 9-62650 OMC Stern Drive 911836 915840	1	Outdrive Gasket		N/A
18-2996	GLM 86300 Mallory 9-76508 OMC Stern Drive 3852560 911823 Volvo Penta 3852560	1	Outdrive Seal		N/A
18-7153	GLM 81180 Mallory 9-76505 Mercruiser Stern Drive 25-25439 Mercury Marine 25-25439 Mercury Race Outboard 25-25439 Mercury Race Sterndrive 25-25439 OMC Stern Drive 3852565 911851 Volvo Penta 3852565 997368	2	O-Ring		N/A

Replacement Powerflow Manifold to Riser Gasket Early Style Round Hole

These are all the popular IMCO riser gaskets Don't be caught without spares This is a common wear item.

Replacement Powerflow Plus Tailpipe Gaskets (Sold as Each)

These are all the popular IMCO riser gaskets Don't be caught without spares This is a common wear item.

Replacement riser gasket for Hardin Seaward manifolds and risers. 4-1/2" x 3" Bolt pattern.