B3.9 and B5.9 Series Engines
Section 1 - Cylinder Block - Group 01
The piston ring sets are also different. While both sets
consist of three rings, the top ring of the turbocharged/
aftercooled set has a keystone profile that operates in a
ni-resist insert cast into the piston. The naturally aspirated
top ring is square cut and operates in a groove machined
into the aluminum piston.
The 1994 automotive pistons utilize different top ring lo-
cations. The 160-hp to 175-hp ratings use 8-mm crown to
ring land pistons and 190 hp to 210 hp use 10 mm. The 1994
industrial pistons continue with the 14 mm ring position.
Overheating of the engine from a loss of coolant will cause
the cylinder to overheat, resulting in seizure of the piston.
Loss of piston cooling lubricating oil can also lead to piston
Coolant is toxic. If not reused, dispose of in accordance
with local environmental regulations.
· Drain the coolant. Refer to Procedure 008-018.
· Remove the cylinder head. Refer to Procedure 002-