Toyota Cylinder Head for Land Cruiser BJ70 3B | OEM 11101-58010

Technical Q&A: Toyota 3B Cylinder Head

Why does the Toyota 3B cylinder head crack between the valves or in the pre-combustion chambers?

Thermal stress from heavy towing or high-mileage (150,000+ km) causes cracking in the pre-combustion chambers and between exhaust valves on the 3B indirect injection engine. Our 11101-58010 replacement features high-density cast iron alloy with improved thermal shock resistance to prevent coolant loss, overheating, and fire ring failure.

What is the head bolt torque sequence for the Toyota 3B cylinder head?

For early 3B engines (before 08/88), the head bolt torque is 118 Nm. For the late series (3B Blue block), the specification is 49 Nm, plus 90 degrees, plus another 90 degrees. Always use new M12 x 1.25 x 122mm head bolts and clean block threads with a grooved old bolt—do not use a thread tap. If using an MLS gasket, flush the coolant system and wait 600km before adding anti-freeze to ensure a proper seal.

Which vehicles use the 11101-58010 cylinder head?

This 3.4L OHV 8V cylinder head fits Toyota Land Cruiser BJ40, BJ42, BJ60, and BJ70 series, as well as Coaster (BB20/BB40) and Dyna (BU36/BU100) commercial vehicles. It serves as a direct cross-reference for OEM numbers 11101-58014, 11101-56014, and 11101-56034. Note that it is not interchangeable with the 14B (11101-58040) cylinder head.

Should I replace the pre-combustion chambers when rebuilding the 3B engine?

Yes. If you observe any cracking extending into the fire ring, the pre-combustion chambers must be replaced. A machine shop must mill the deck after installing new nozzles to ensure they sit 100% flush. Our complete assembled 11101-58010 cylinder heads come with brand-new, flush-machined pre-cups already installed, saving you expensive machine shop fees and downtime.