Head bolts are an essential part of any engine and play a critical role in keeping engines running smoothly. But what are head bolts, and what is their purpose? Let’s take a closer look at these vital components and explore how they work.
What is Head Bolt?
Head bolts are fasteners that hold the cylinder head to the engine block in internal combustion engines. They can also be used to attach other parts of the block as well, such as the camshafts, timing chain covers, and oil pan. They come in many different sizes, shapes, and materials, depending on their specific application.
Head Bolt Uses
Head bolts have several important uses. First off, they create a strong bond between two metal components that would otherwise move independently from one another due to thermal expansion and contraction caused by temperature fluctuations inside the engine block. They also help maintain proper compression by seating the cylinder head firmly against the block while still allowing a small amount of motion to account for thermal expansion and contraction. Finally, head bolts provide an extra layer of protection against potential leaks from the cylinder head into the rest of the engine block.
Head Bolt Dimensions
| Diameter (d) | Pitch | Length of threaded portion* (b) | Head Depth (k) | Across Flats (s) |
|---|---|---|---|---|
| M4 | 0.7mm | 14mm | 2.8mm | 7mm |
| M5 | 0.8mm | 16mm | 3.5mm | 8mm |
| M6 | 1.0mm | 18mm | 4mm | 10mm |
| M7 | 1.0mm | 20mm | 4.8mm | 11mm |
| M8 | 1.25mm | 22mm | 5.3mm | 13mm |
| M10 | 1.5mm | 26mm | 6.4mm | 17mm |
| M12 | 1.75mm | 30mm | 7.5mm | 19mm |
| M14 | 2mm | 14mm | 8.8mm | 22mm |
| M16 | 2mm | 38mm | 10mm | 24mm |
| M18 | 2.5mm | 42mm | 11.5mm | 27mm |
| M20 | 2.5mm | 46mm | 12.5mm | 30mm |
| M22 | 2.5mm | 50mm | 14mm | 32mm |
| M24 | 3.0mm | 54mm | 15mm | 36mm |
| M27 | 3.0mm | 54mm | 15mm | 41mm |
| M30 | 3.5mm | 66mm | 18.7mm | 46mm |
| M33 | 3.5mm | 72mm | 21mm | 50mm |
| M36 | 4mm | 78mm | 22.5mm | 55mm |
| M39 | 4mm | 84mm | 25mm | 60mm |
| M42 | 4.5mm | 90mm | 26mm | 65mm |
| M45 | 4.5mm | 96mm | 28mm | 70mm |
| M48 | 5mm | 102mm | 30mm | 75mm |
Conclusion:
Head bolts play an essential role in helping your engine run smoothly and efficiently. Not only do they keep critical components firmly attached together, but they also act as a sealant against potential leaks from one part of your engine into another. If you’re ever unsure about replacing or checking your head bolts, it’s always best to consult an expert who can answer any questions you may have about these important components!
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