head-bolts
Cylinder head fasteners
Head-bolts are heavy-duty fasteners used to secure a cylinder head to an engine block, maintaining the seal between these components under extreme heat and pressure.
They must be tightened in a specific sequence and to precise torque specifications to ensure even clamping force across the head gasket.
The mechanic replaced the head-bolts after the gasket blew.
Reusing stretched or damaged head-bolts can lead to gasket failure and serious engine damage.
Making less loose
- looseningReducing tightness or tension
- threadingPassing strand through opening
- lubricationCoating to reduce friction
- sealantGap-blocking substance
assembly · removal · replacement · cleaning · inspection · alignment · seating · anti-seize
Stated requirements and parameters
- foot-poundsWork or torque unit
- preloadInstall in advance
- sequenceOrdered succession of elements
- patternRecurring arrangement or template
angle · degrees · calibration · dynamometer · socket · settings · stretch · rotation
tightening
Making less loose
- looseningReducing tightness or tension
- threadingPassing strand through opening
- lubricationCoating to reduce friction
sealant · assembly · removal · replacement · cleaning · inspection · alignment · seating · anti-seize
specifications
Stated requirements and parameters
- foot-poundsWork or torque unit
- preloadInstall in advance
- sequenceOrdered succession of elements
pattern · angle · degrees · calibration · dynamometer · socket · settings · stretch · rotation · precision
gasket
Mechanical leak preventer
fasteners · threads · flange · spacers · retainers · fittings · anchors · rivets · brackets · clamps
stripped
Had coverings removed
seized · overtorqued · cracked · fatigue · sheared · damaged · leaking · warped · broken