Are you ready to replace the corroded and rusted head bolts on your Mercury 2-Stroke V6 outboard (2.0, 2.4, 2.5 Liter)?
 
Upgrade to our premium-quality Head Bolt Kit, to provide durability, strength, enhanced performance, and looks. This kit includes twenty-four (24) Grade 8 Bolts and twenty-four (24) Case Hardened Washers, making it the perfect solution to restore and protect your engine.
 
Our shouldered head bolts are manufactured with a Grade 8 tensile strength of 150,000 psi, ensuring exceptional reliability. The shoulder and gold zinc finish, offer superior protection against corrosion and moisture compared with the OEM bolts.
 
The integrated flange design acts as a built-in washer, providing a larger bearing surface area to distribute loads more evenly and securely.
 
The kit includes extra-thick case-hardened Grade 8 gold zinc washers (.410 X .809 X .115)  enhance torque accuracy and provide additional clearance for shoulder bolts on flycut heads of up to .115 inches.
 
Designed to fit most Mercury 2-stroke V6 outboards produced between 1976 and 2005, this comprehensive kit delivers exceptional performance and value.
 
This kit cross-references with OEM part numbers: 10-98534, 12-25909 (stock washer), 8M0125882, 849677, 878217, and 10-878217, with a Mercury MSRP of $249.97. It includes 24 US SAE Head Bolts and 24 US SAE Thick Washers for a total of forthy-eight (48) pieces.
 
Select at check out:
Gasket Heads: Includes shorter bolts (10-98534) and stock washers (12-25909). These bolts are slightly shorter.
O-Ring Heads: Includes longer bolts (8M0125882, 849677, 10-878217) and stock washers (12-25909). These bolts are slightly longer.
 
Install Instructions:
 
Proper installation and torquing of head bolts on a Mercury 2-Stroke V6 outboard is essential for a secure seal and reliable performance.
 
1) Clean the cylinder head and engine block mating surfaces thoroughly, removing all old gasket material and debris.
 
2) Position a new head gasket on the block, ensuring correct alignment with bolt holes and water passageways.
 
3) Lightly coat the bolt threads and washer undersides with oil to reduce friction and ensure accurate torque readings.
 
4) Insert the washers onto the bolts and thread them through the cylinder head into the block by hand to prevent cross-threading.
 
5) Tighten the bolts in the correct inside-out sequence, starting from the center and working outward in a crisscross pattern.
 
6) Use a torque wrench to tighten the bolts in three stages: first to 15 ft-lbs, then to 30-40 ft-lbs (follow the specific torque specifications for your model).
 
7) After completing the final torq pass, double-check all bolts in sequence for uniform tightness by gently double-clicking each on the torq wrench.
 
8) Recheck torque after the first few hours of operation to ensure the bolts remain secure. 
 
For any questions or additional assistance, contact Mike Hill at 714-697-1716 or mike@buckshotracing77.com. Upgrade your Mercury outboard today with the reliability and strength of our premium Head Bolt Kit!