Crom® Head Gasket Set Volvo Penta 251A AQ171A AQ171C 876303 876071 18-3870

This head gasket kit, also known as a decarbonizing gasket kit, includes the head gasket with а reference  1378646, 1326785, 1332644. The cylinder head bolts with reference 1317761, 1326239 should be replaced when needed[1], and tightening should be performed in three stages with bolts lubricated.

Tightening torque settings:

• 20 Nm 15 lbf. ft.
• 40 Nm 30 lbf. ft.
• angle tightening 120°

Kindly check the second picture that provides the necessary instructions, directly quoted from the Volvo Penta workshop manual.

[1] The cylinder head bolts should be replaced when there are signs of elongation, or cannot be specified if it is already elongated, by checking the "waist" of the bolt. As a rule of thumb, a cylinder head bolt of these Aquamatic series, cannot be re-used more than five times.

Crom® Head Gasket Set Volvo Penta 251A AQ171A AQ171C 876303 876071 18-3870

This product replaces the following manufacturer's part nr:

• Volvo Penta: 876303, 876071 
  
• Orbitrade: ORB21303, 21303
• Sierra: 18-3870 
• Recmar: REC876303
• Crom order number: 121030

The references that are listed here are trademarks that apply to the respective trademark owners. The references are used only for a reference purpose. Our product is compatible with these reference numbers. Please note that our product is an aftermarket product (non-OEM), unless otherwise stated.