HBS046 NISSAN HEAD BOLT SET
Description
HBS046 Permaseal Head Bolt Set
Engine Compatibility: CD20 Nissan 1973 I4 Diesel 1990/05 - 1998/08
Vehicle Compatibility: Nissan Avenir W10 1990/05-1998/08 Nissan Primera P11E Nissan Serena C23 1991-1998
These engines use Torque to Yield (TTY) head bolts in the cylinder head, also known as stretch bolts, angle torque, torque to turn, wasted or stretch bolts, which are only able to be fit once.
TTY head bolts are used on many engines to clamp the cylinder head to the block. They differ from ordinary head bolts in that TTY bolts are designed to stretch slightly when they are tightened down. TTY head bolts help to ensure even clamping forces across the head gasket to provide a better seal.
TTY head bolts require somewhat less torque when they are tightened than a conventional head bolt. This helps reduce distortion in the cylinder bores, meaning less blowby past the piston rings, lower emissions and better compression.
This is old stock, packaging may be open, damaged or faded - this does not affect the quality of the item