This head gasket kit, also known as a decarbonizing gasket kit, includes the head gasket with а reference  9139284, 3855409, 461056, 430107, 461618. The cylinder head bolts with reference 191523, should be replaced when needed[1], and tightening should be performed in two stages.

Tightening torque settings:

• 24.5-29.5Nm 18-22 lbf. ft.
• 88 Nm 64 lbf. ft. [warmed]

The screws are to be re-torqued after the engine has been warmed up. 

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 AQ165A BB165A AQ170 876335 876337 18-2816

This product replaces the following manufacturer's part nr:

• Volvo Penta: 876335, 876337, 875402, 875533
  
• Orbitrade: ORB21335, 21335
• Sierra: 18-2816
• Recmar: REC876337
• Crom order number: 121035

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.