7700738986 7700738987BOLT CYLINDER HEAD

High-Strength Cylinder Head Bolts for Engine Assembly – CYL BOLTS 7700738986 / 7700738987

Engine cylinder head bolts, specifically model numbers 7700738986 and 7700738987, are precision-engineered fasteners designed to maintain optimal engine integrity in internal combustion systems. These cylinder bolts play a vital role in securing the cylinder head to the engine block, ensuring consistent compression, preventing coolant or oil leaks, and supporting high-pressure environments during operation. Whether used in automotive, industrial machinery, or marine propulsion units, these fasteners deliver unmatched reliability when installed correctly.

Key features include premium-grade alloy steel construction that resists fatigue, corrosion, and thermal expansion under extreme conditions. Each bolt is manufactured to meet ISO and OEM specifications, offering exact dimensional accuracy for seamless fitment across multiple engine platforms. Their hardened surface finish enhances wear resistance, while their uniform thread pitch ensures consistent torque application—critical for avoiding gasket damage or warping of the cylinder head. These components are ideal for both routine maintenance and performance upgrades where durability and precision matter most.

Designed for use in gasoline and diesel engines found in passenger vehicles, commercial trucks, agricultural equipment, and marine outboards, these cylinder head bolts offer broad compatibility. They support engine rebuilds, head gasket replacements, and preventive servicing without compromising mechanical efficiency. The inclusion of proper torque values in installation guides helps users avoid over-tightening or under-tightening—a common cause of premature failure in engine assemblies. Always refer to manufacturer-recommended tightening sequences and values before proceeding with any repair work.

These fasteners are frequently employed by professional mechanics, DIY enthusiasts, and fleet maintenance teams who prioritize long-term engine health. Users report excellent longevity even after thousands of miles or operating hours, particularly when following best practices such as using new washers, applying anti-seize compounds where appropriate, and inspecting threads prior to installation. Many note improved sealing performance compared to generic alternatives, especially in high-output applications like turbocharged or modified engines.

Common applications extend beyond traditional engine repairs—they’re also utilized in hydraulic systems, transmission mounts, and other heavy-duty mechanical joints requiring precise clamping force. This versatility makes them valuable additions to toolkits in workshops, fabrication labs, and mobile service units worldwide. However, it's essential to verify compatibility with your specific engine model before purchasing, as incorrect usage may lead to misalignment or component stress.

Some frequently asked questions include: “Can I reuse these bolts?” While possible in some cases, it’s strongly advised to replace them during major engine disassembly due to potential thread wear or stretch from previous torque cycles. Another question often raised is about torque settings—typically ranging between 85–120 ft-lbs depending on engine type, though always consult your vehicle’s service manual. Lastly, users sometimes ask if they’re suitable for racing engines; yes, provided they're paired with quality gaskets and installed with calibrated tools.

Product Categories : Engine Cylinder Unit > Bolt Cylinder Head