Why are there so many bolts to hold down the cylinder head?
Why are there so many bolts to hold down the cylinder head?
Its main function is to apply the closing force evenly between the block and the cylinder head, to ensure a perfect seal between both parts and avoid the leakage of liquids and gases in the engine.
How are bolts held in place during assembly?
Many bolts are held fixed in place during assembly, either by a tool or by a design of non-rotating bolt, such as a carriage bolt, and only the corresponding nut is turned. Bolts use a wide variety of head designs, as do screws. These are designed to engage with the tool used to tighten them.
Why are head bolts supposed to be in perfect condition?
Consequently, it’s extremely important that all the head bolts be in perfect condition and are installed and lubricated properly so they are not overloaded. Though head bolts seem to be pretty rigid fasteners, they are actually designed to stretch. Stretching a bolt is like stretching a rubber band.
What are the different types of bolt heads?
Some bolt heads instead lock the bolt in place, so that it does not move and a tool is only needed for the nut end. Common bolt heads include hex, slotted hex washer, and socket cap. The first bolts had square heads, formed by forging. These are still found, although much more common today is the hexagonal head.
Why do you need to tighten cylinder head bolts?
Cylinder-head bolts are the design elements of the cylinder head sealing system that generate the required surface pressure, transmitting it to the engine components. This requires that the cylinder-head bolts be tightened in close com- pliance with the specified instructions and in the specified sequence (see section 4).
How are nuts and bolts held in place?
Hold and place nuts and bolts in hard to reach areas. Clip Magnetic Wrench Attachment on any size wrench to hold nuts and bolts in place before tightening. No more fumbling while trying to hold small parts!
What’s the best way to install head bolts?
1. Make sure all the head bolts are in perfect condition with clean, undamaged threads. Dirty or damaged threads can give false torque readings as well as decrease a bolt’s clamping force by as much as 50%! any that are nicked, deformed or worn.
Consequently, it’s extremely important that all the head bolts be in perfect condition and are installed and lubricated properly so they are not overloaded. Though head bolts seem to be pretty rigid fasteners, they are actually designed to stretch. Stretching a bolt is like stretching a rubber band.
What kind of bolts are used for cylinder heads?
T he new types of cylinder-head bolts: first choice for lightweight engines. The thermal expansion of lightweight engine designs such as • aluminum cylinder head and gray cast iron crankcase • cylinder head and crankcase of aluminum is different than that of the steel cylinder-head bolt.
