How are cylinder head bolts tightened on a Cylin der engine?
Tightening sequence. The cylinder-head bolts (e.g. 1- 10 on a 4 cylin- der engine, illustrated above) are to be tightened in a precisely defined sequence (see manufac- turer’s instructions). Like tightening torque and tightening angle, this sequence is specified by the engine and gasket manufacturers and depends on the individual engine design.
Do you need to replace cylinder head bolts?
E lring – even better service. For the current generation of engines, the profes- sional repairing of the cylinder head sealing system requires that both components – cylinder- head gasket and cylinder-head bolts – be re- placed with new parts. With the new full range of cylinder-head bolts from Elring, you save time and money.
What are the different types of cylinder head bolts?
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. The thermal expansion of the aluminum engine components is roughly twice that of the cylinder-head bolts. 3. Types of bolts
Where does elasticity occur in cylinder head bolts?
These bolts have a very long threaded section that usually extends to just under the bolt head. This is where the elastic and plastic elon- gation of the bolt occurs during tightening and when the engine is in operation. The design with the long thread increases the elasticity, pro- 10 T aking a turn for more reliability.
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.
How are cylinder heads attached to engine block?
Your cylinder head bolts attach the cylinder head to the engine block. Cylinder head bolts come in a set, usually enough to attach one head. They must be torqued to specification in a pattern that can be found in your vehicle’s service manual.
What does the torque sequence mean on a cylinder head?
Torque sequence refers ro the pattern in which you tighten the bolts. The overall goal is to spread the torque evenly as you are tightening the bolts. Usually, you start at one bolt, and you work your way around in a circular pattern. Doing so ensures that your head won’t be warped during the tightening sequence.