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Engine bolts are essential components that play a crucial role in the assembly and operation of an engine. They secure various parts, including the cylinder head, connecting rods, and timing components, ensuring everything stays in place under extreme conditions. Different types of bolts, such as hex head, flange, and torque-to-yield bolts, are specifically designed for various applications, each requiring precise specifications for strength and torque. The right choice and installation of these bolts are vital for engine reliability and performance, as failure to do so can lead to significant mechanical issues and costly repairs. |
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What types of bolts are available?
Car engines use various types of bolts, each designed for specific purposes and load requirements. Some common engine bolts are hex head and socket head bolts for general use and tight spaces. In other areas, studs and nuts are used when necessary. Nuts are threaded onto the studs and secured to the correct torque to hold the parts. In internal combustion engines, so-called torque-to-yield bolts are commonly used. These bolts are tightened with a prescribed torque, after which the bolt is in the stretching limit. In this area, the bolt has some spring force that allows it to absorb any movement of the attached part. In modern engines, for example, cylinder heads bolts are always stretch bolts.
The last type to mention has a thermal resistant to high heat, and they are commonly used with exhaust manifolds, exhaust system and turbochargers. Each type of bolt is chosen based on the application's specific requirements, including stretching strength, heat resistance, and corrosion resistance.
How to determine the correct bolt?
Searching for the correct bolts with your application can be a difficult experience. Consulting the service manual is the best source for finding the right specifications. It can provide details on each application's correct sizes, grade, and torque specification. Apart from the length and diameter, of course, the correct pitch of the bolt's thread is very important. This can be measured with a thread pitch gauge. Verify the bolt grade, and ensure the material compatibility (e.g., steel, stainless steel, copper) will withstand the environment and loads it will encounter.
What is the function of camshaft bolts?
Camshafts bolts are used to attach the camshaft bearing caps.
What is the function of connecting rod bolts and crankshaft bolts?
Connecting rod or crankshaft bolts play a similar role in the engine. The main bearing caps are secured with the crankshaft bolts and hold the crankshaft in place. The connecting rod bolts do the same thing but for the connecting rod bearing caps. Because these are torque-to-yield bolts, they ensure proper operation of the crankshaft and connecting rods under all conditions. Always use high-quality connecting rod bolts and / or crankshaft bolts with the right stretching strength and ensure they are torqued to the manufacturer’s specifications to prevent catastrophic engine failure due to bolt loosening or breakage. Torque-to-yield bolts, as used as described here but also cylinder head stretch bolts cannot be reused and should always be replaced after disassembly.
Can cylinder head bolts be reused?
When installing bolts, always follow the official installation instructions. Torque-to-yield bolts, and also cylinder head stretch bolts, cannot be reused and should always be replaced after disassembly. You can find more information on installing cylinder head bolts in our blog.
From what brands are bolts available?
Wilmink Engine Parts carries a full line of bolts from brands like Elring and Victor Reinz. You can find bolts like cylinder head bolts and connecting rod bolts in our webshop.