M40 M42 M43 M44

Manufacturer: ACL Bearing Company
Part number: 4B1490H-STD
For BMW - 1.6 1.8 1.9 (M40, M42, M43, M44)

ENGINE BEARINGS
	MAIN BEARING SET
	Part#
	5M1538H	5M1538HX
Sizes	STD, .025, .25, .50	STD
Oil Clearance	Standard	+ 0.001" Extra
Half Type	Upper & Lower
Material	Tri-metal
Min Std Shaft Size	2.3611in / 59.971mm
Max Std Shaft Size	2.3618in / 59.990mm
Min Std Tunnel Size	2.5591in / 65.000mm
Max Std Tunnel Size	2.5598in / 65.019mm
Max Wall at Crown	0.0980in / 2.490mm	0.0930in / 2.478mm
Max Overall Length	0.787in / 20.00mm #1,2,4,5 0.982in / 24.94mm #3 thrust
Notes
Diagram        (Top View)

Engines BMW - 1.6 1.8 1.9 (M40, M42, M43, M44)

Manufacturer: ACL Bearing Company
Part number: 4B1490HX-STD
For BMW - 1.6 1.8 1.9 (M40, M42, M43, M44)

Manufacturer: ACL Bearing Company
Part number: 4B1490H-0.25
For BMW - 1.6 1.8 1.9 (M40, M42, M43, M44)

ENGINE BEARINGS
	MAIN BEARING SET
	Part#
	5M1538H	5M1538HX
Sizes	STD, .025, .25, .50	STD
Oil Clearance	Standard	+ 0.001" Extra
Half Type	Upper & Lower
Material	Tri-metal
Min Std Shaft Size	2.3611in / 59.971mm
Max Std Shaft Size	2.3618in / 59.990mm
Min Std Tunnel Size	2.5591in / 65.000mm
Max Std Tunnel Size	2.5598in / 65.019mm
Max Wall at Crown	0.0980in / 2.490mm	0.0930in / 2.478mm
Max Overall Length	0.787in / 20.00mm #1,2,4,5 0.982in / 24.94mm #3 thrust
Notes
Diagram        (Top View)

Engines BMW - 1.6 1.8 1.9 (M40, M42, M43, M44)

ENGINE BEARINGS
	MAIN BEARING SET
	Part#
	5M1538H	5M1538HX
Sizes	STD, .025, .25, .50	STD
Oil Clearance	Standard	+ 0.001" Extra
Half Type	Upper & Lower
Material	Tri-metal
Min Std Shaft Size	2.3611in / 59.971mm
Max Std Shaft Size	2.3618in / 59.990mm
Min Std Tunnel Size	2.5591in / 65.000mm
Max Std Tunnel Size	2.5598in / 65.019mm
Max Wall at Crown	0.0980in / 2.490mm	0.0930in / 2.478mm
Max Overall Length	0.787in / 20.00mm #1,2,4,5 0.982in / 24.94mm #3 thrust
Notes
Diagram        (Top View)

Engines BMW - 1.6 1.8 1.9 (M40, M42, M43, M44)

Ferrea Competition Plus Valves have built a reputation as the industry's most reliable extreme duty valve. To manufacture the valves we use special aerospace quality alloys, including the EV8-Z18, which provides high tensile strength. An exclusive two-step slow forging process ensures proper grain flow and virtually eliminates any damage to thematerial structure. The valves are then heat-treated and stress-relieved over a 48-hour period, which is the crucial base of our molecular integrity. These valves feature avionics-quality hard chrome along with a specially applied hard tip.

Ferrea Competition Plus Valves have built a reputation as the industry's most reliable extreme duty valve. To manufacture the valves we use special aerospace quality alloys, including the EV8-Z18, which provides high tensile strength. An exclusive two-step slow forging process ensures proper grain flow and virtually eliminates any damage to thematerial structure. The valves are then heat-treated and stress-relieved over a 48-hour period, which is the crucial base of our molecular integrity. These valves feature avionics-quality hard chrome along with a specially applied hard tip.

COMETIC MLS (Multi-Layer Steel) Head Gaskets provide maximum sealing performance for today's high output engines and require no sealants. MLS gaskets are ideal for both aluminum heads to aluminum blocks and aluminum heads to cast iron blocks. They can withstand the shearing force created by the two materials. MLS gaskets have increased strength because they are comprised of multiple layers of stainless steel; which also creates the ability to rebound and resist corrosion. The outer layers are embossed and coated on both sides with Viton (a flouroelastomer rubber based material that is heat resistant to 250 C/ 482 F). Viton is designed to meet the demands of a variety of harsh sealing environments, load conditions, and surface finishes. The center or shim layer is uncoated stainless steel, which can be varied to accommodate multiple thickness requirements.

COMETIC MLS (Multi-Layer Steel) Head Gaskets provide maximum sealing performance for today's high output engines and require no sealants. MLS gaskets are ideal for both aluminum heads to aluminum blocks and aluminum heads to cast iron blocks. They can withstand the shearing force created by the two materials. MLS gaskets have increased strength because they are comprised of multiple layers of stainless steel; which also creates the ability to rebound and resist corrosion. The outer layers are embossed and coated on both sides with Viton (a flouroelastomer rubber based material that is heat resistant to 250 C/ 482 F). Viton is designed to meet the demands of a variety of harsh sealing environments, load conditions, and surface finishes. The center or shim layer is uncoated stainless steel, which can be varied to accommodate multiple thickness requirements.

COMETIC MLS (Multi-Layer Steel) Head Gaskets provide maximum sealing performance for today's high output engines and require no sealants. MLS gaskets are ideal for both aluminum heads to aluminum blocks and aluminum heads to cast iron blocks. They can withstand the shearing force created by the two materials. MLS gaskets have increased strength because they are comprised of multiple layers of stainless steel; which also creates the ability to rebound and resist corrosion. The outer layers are embossed and coated on both sides with Viton (a flouroelastomer rubber based material that is heat resistant to 250 C/ 482 F). Viton is designed to meet the demands of a variety of harsh sealing environments, load conditions, and surface finishes. The center or shim layer is uncoated stainless steel, which can be varied to accommodate multiple thickness requirements.