What do you torque your head bolts to?
If an engine produces 1,500 pounds of pressure and the cylinder head has 8 bolts, then each bolt must be tightened to 187 foot-pounds of torque to secure the cylinder head to the block.
What does torque mean on a head bolt?
A crucial component of engine building is setting the torque on head bolts. Torque refers to how tight a bolt should be. When setting the torque, reliance on the specifications set by design engineers is vital. One essential tool you must have is a good quality torque wrench. Without one, you are like a ship without a compass at sea.
What’s the best way to torque a cylinder head?
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.
Do you have to reuse torque to yield head bolts?
For regular head bolts, make sure all of the head bolts are in good condition; free from nicks, corrosion and are not stretched. Never reuse torque to yield (TTY) head bolts because, if you do it’s not unusual for them to break. If that happens you need to drill out what’s left of the bolt. Even worse you may have to repair the threads in the hole.
How to torque cylinder head bolts, BMW M20?
Some cylinder heads like this BMW M20 engine require you to torque down the head bolts first to a torque value and then to a degree value. In this case it’s 90 degree twice. I show you a complete demo of how to do this correctly. If you purchase from this link, you will pay exactly the same, and my channel will make a small commission.
When do you re torque the head bolts?
Tighten each head bolt in the same sequence as before while the engine is still warm. If the engine has an aluminum cylinder head or block; however, do not re torque the head bolts; until the engine has cooled back down to room temperature.
How much torque does a cylinder head have?
Mark each head bolt and head with aligning marks. Tighten each bolt 1/4 turn (90 degrees). For each cylinder head, start with head bolt numbered one. In increasing number sequence (1-2-3-4), tighten the head bolt in four stages. 1. Tighten each bolt to 7-9 foot pounds of torque. 2. Tighten each bolt to 12-15 foot pounds of torque.
How are LS head bolts stretched after torquing?
Read on for details to make sure you do it right. LS head bolts are torque-to-yield (TTY), meaning they cannot be reused a second time. A TTY bolt is stretched when fastened, typically with a specified degree of turn after torquing. This means the bolt will not go back to its original shape after being installed.
Some cylinder heads like this BMW M20 engine require you to torque down the head bolts first to a torque value and then to a degree value. In this case it’s 90 degree twice. I show you a complete demo of how to do this correctly. If you purchase from this link, you will pay exactly the same, and my channel will make a small commission.