As a rule, the threads and underside of the head on most standard automotive head bolts should be lubricated with motor oil before the bolts are installed. The torque values specified by the engine manufacturer are typically based on oiled threads and fasteners – not dry fasteners.
Can I use grease on head bolts?
Motor oil will be fine. It’s cheap, plentiful and what Honda recommends using. Head bolts are usually torque to yield and usually require replacement after use.
Should bolts be lubricated before torquing?
So, torque isn’t the true measure of bolt tightness—it’s tension. But lubrication on the bolt threads—and a whole host of other factors—can cause fluctuation in torque readings. So once you add a lubricant of any kind to the threads, all bets are off as to whether the same torque setting will truly secure the bolt.
Do you need to put anything on head bolts?
In most cases you don’t need to retorque head bolts or studs. … Always use lubrication on your head bolts and studs. Make sure your fasteners are clean and the holes are free from debris. Use a thread chaser, and not a tap, to clean out the holes in the block.
Should you lubricate bolts?
By lubricating the fastener the results are further improved and scatter is reduced to 10%-15% which is about as good as can be achieved using torque control methods. When tightening a fastener ALWAYS use a controlled method. Unless specifically told not to, always lubricate the fastener.
Should you put grease on a head gasket?
To ensure accurate torque values and to avoid cracking the cylinder block, clean any dust, dirt, oil and fluid from the cylinder block head bolt holes before installing the new head gasket and head bolts. … Unless otherwise specified, lightly lubricate the bolt threads with 30w non-detergent motor oil.
What happens to a torqued bolt if the threads are not properly lubricated?
If that lubricant isn’t applied generously/properly, the dry parts of the fastener will increase your Nut Factor and result in different bolt loads on each of your fasteners.
How do you lubricate nuts and bolts?
If the bolting assemblies have lost their lubrication, you may reapply an oil-based structural bolt lubricant, like stick wax or liquid wax, prior to installation. To do this, put the lubricant on the nut’s threads and inside face.
Do you torque the nut or the bolt?
In simple terms, you need torque to create tension in a bolt. You use torque to turn a nut onto a bolt and then to stretch the bolt, making it a solid spring that clamps the two materials together.
Should cylinder head bolts be reused?
A head bolt should not be reused if the threads are galled or badly damaged. … Chasing damaged head bolt threads with a die will clean up the threads but also remove material (metal) and undermine the head bolt’s ability to torque down and hold to specs.
Should you use threadlocker on head bolts?
Do NOT use Loctite on the nuts for the head studs or main studs. Always ensure that the threads are clean prior to applying any lube. When using Loctite, make sure you assemble the parts before the Loctite cures. You can use Loctite instead of ARP Ultra-Torque, but do not use them together.
How tight should cylinder head bolts be?
In most applications it is necessary to first hand-tighten each bolt snugly until the head of the bolt is flush with the cylinder head surface. The bolts are then partially tightened to approximately half of their recommended torque loading in the order specified by the particular engine’s manufacturer.
What do you lubricate threads with?
Grease can work to ensure that removal is easy after exposure to water and salt, but dedicated anti-seize compounds work better. Most grease is designed for use as a lubricant on moving parts.
What is the best lubricant for rusted bolts?
If the bolt is stuck in place because of rust, you can use a bolt loosening spray such as WD-40 Penetrant Spray. This penetrating oil provides deep lubrication to loosen the nut or screw.