B3.9 and B5.9 Series Engines
Section 1 - Cylinder Block - Group 01
Low compression on a single cylinder can be caused by an
external leak or a leak to a coolant passage.
A compression leak to the coolant will normally be detected
by loss of coolant as the coolant is blown from the cooling
External cylinder head gasket leaks can be detected visu-
ally. Liquid soap can be used to locate external leaks.
The cause of piston ring wear can range from wear over a
long period of service to a dust-out in a short period be-
cause of poor maintenance of the air intake system.