Archive for the ‘Technical Specifications’ Category

Mercruiser Big V8 Marine Engine Fastener Torque Spec’s

Wednesday, February 15th, 2012

454 CID / 7.4L / 502 CID / 8.2L Torque Specifications

DESCRIPTION	Lb. In.	Lb. Ft.	N^.m
Alternator Brace to Alternator	192		9
Alternator Brace to Engine		30	41
Alternator to Mounting Bracket		35	48
Alternator Mounting Bracket		30	41
Camshaft Sprocket Gear		18	24
Carburetor	132		15
Connecting Rod Caps (3/8-24 Nuts) (7/16-20 Nuts)		50	68
Connecting Rod Caps (3/8-24 Nuts) (7/16-20 Nuts)		73	99
Coupler/Flywheel (MCM)		35	48
Crankcase Front Cover	120		14
Crankshaft Pulley		35	48
Cylinder Head		85	115
Distributor Hold Down		20	27
Exhaust Manifold		30	41
Exhaust Manifold Elbow		30	41
Filter Adapter (5/16-18)		20	27
Flywheel		75	100
Flywheel Drive Plate (MIE)		35	48
Flywheel Housing to Block		30	41
Flywheel Housing Cover	80		9
Front Mount Bracket		30	41
Fuel Pump		25	34
Intake Manifold		35	48 (See Note)
Main Bearing Cap		110	149
Oil Baffle Nuts		25	34
Oil Filter Adapter Nuts		40	54
Oil Pan Bolts (5/16-18)	80		9
Oil Pan Drain Plug		15	20
Oil Pump		70	95
Oil Pump Cover	80		9
Power Steering Pump Brace to Block		30	41
Power Steering Pump Bracket		30	41
Rear Mount (MCM)		40	54
Rear Mount (MIE)		50	68
Remote Oil Connector (1/2 in x 13)		25	34
Rocker Arm Cover	90		10
Rocker Arm Bolts 7.4L/454 454 Magnum/502		40	54
Rocker Arm Bolts 7.4L/454 454 Magnum/502		45	61

Note: 7.4L / 454 and 502 MPI engines, Torque intake manifold fasteners to 25-30 Lb. Ft. (34-41 N^.m)

454 CID / 74.L / 502 CID / 8.2L Torque Specifications

DESCRIPTION	Lb. Ft.	N^.m
Remote Oil Filter Adapter Nut/Fitting	20	27
Seawater Pump Brace	30	41
Seawater Pump Bracket	30	41
Spark Plugs	15	20
Starter Motor	50	68
Thermostat Housing	30	41
Torsional Damper	40	54
Transmission To Housing	50	68
Water Circulating Pump	35	48
Water Temperature Sender	20	27

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Mercruiser Big Block 8.2L V8 Marine Engine Product Specifications

Wednesday, February 15th, 2012

(V-8 Models)

Models	502 Mag MPI
Propshaft Horsepower	415¹
Propshaft Kilowatts	309¹
Displacement	502 cid (8.2 l)
Maximum rpm @ WOT³	4600-5000 rpm
Idle rpm in NEUTRAL³	600 rpm⁶
Oil Pressure @ 2000 rpm	30-70 psi (207-483 kPa)
Min. Oil Pressure @ Idle	4 psi (28 kPa)
Thermostat	160°F (71°C)
Timing @ Idle rpm⁴	8° BTDC
Firing Order	1-8-4-3-6-5-7-2
Electrical System	12-Volt Negative (-) Ground
Alternator Rating – Hot Operating Amps	65 Amps
Alternator Rating – Cole Operating Amps	72 Amps
Recommended Battery Rating	Minimum 650 cca/825 mca/150 Ah

¹ Power Rated in Accordance with NMMA (National Marine Manufacturers’ Association)

rating procedures.

³ Measured using an accurate service tachometer with engine at normal operating temperatures.

⁴ A special procedure must be followed to check or adjust timing. Consult your Authorized

Mercury MerCruiser Dealer before attempting this procedure.

⁶ Idle speed on EFI models is not adjustable.

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Mercruiser 8.1L Marine Engine Fluid Capacities

Wednesday, February 15th, 2012

NOTICE

Engine Measurements: U.S. Quarts (Liters)

Sterndrive Measurements: U.S. Fluid Ounces (Milliliters)

All capacities are approximate fluid measures.

Engine Model	496 cid / 8.1 l
Crankcase Oil1 (With Filter)1	9 (8.5)
Seawater Cooling System2	19 (18)
Closed Cooling System	20 (19)

1 Always use dipstick to determine exact quantity of oil or fluid required.
2 Seawater Cooling System capacity information is for winterization use only.

IMPORTANT: It may be necessary to adjust oil levels depending on installation angle and cooling systems (heat exchanger and fluid lines).

Sterndrive Model	Bravo One	BravoTwo	Bravo Three
Drive Unit Oil Capacity (With Gear Lube Monitor)	88 (2603)	104 (3076)	96 (2839)

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Mercruiser 8.1L Marine Engine Specifications

Wednesday, February 15th, 2012

Models	496 MAG HO	496 MAG
Propshaft Horsepower	425¹	375¹
Propshaft Kilowatts	317¹	280¹
Displacement	496 cid (8.1 l)
Maximum rpm @ WOT²	4600-5000 rpm	4400-4800 rpm
Idle rpm in NEUTRAL²	650 rpm
Oil Pressure @ 2000 rpm	60 psi (414 kPa)
Oil Pressure @ Idle	30 psi (207 kPa)
Thermostat	160^oF (71^o C)
Firing Order	1-8-7-2-6-5-4-3
Electrical System	12-Volt Negative (-) Ground
Alternator Rating – Hot Operating Amps	65 Amps
Alternator Rating – Cold Operating Amps	72 Amps
Recommended Battery Rating (Minimum)	650 cca/825 mca/150 Ah

¹ Power Rated in Accordance with NMMA (National Marine Manufactures’ Association) rating Procedures.

² Measured using an accurate service tachometer with engine at normal operating temperature.

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Mercruiser Big Block 7.4L V8 Marine Engine Product Specifications

Wednesday, February 15th, 2012

(7.4L V-8 Models)

Buy Big Block V8 Marine Engines Online……Shop Now

Mercruiser 7.4L & 8.2L Big Block V8 Marine Engine Parts Lookup Diagrams……Search Here

Models	7.4L MPI	454 Mag MPI
Propshaft Horsepower (SAV1 Rating)	310¹ (275²)	385¹
Propshaft Kilowatts (SAV1 Rating)	231¹ (205²)	287¹
Displacement	454 cid (7.4 l)
Maximum rpm @ WOT³	4200-4600 rpm	4600-5000 rpm
Idle rpm in NEUTRAL³	600 rpm⁶
Oil Pressure @ 2000 rpm	30-70 psi (207-483 kPa)
Min. Oil Pressure @ Idle	4 psi (28 kPa)
Thermostat	160° F (71° C)
Timing @ Idle rpm⁴	8° BTDC
Firing Order	1-8-4-3-6-5-7-2
Electrical System	12-Volt Negative (-) Ground
Alternator Rating – Cold Operating Amps	65 Amps
Alternator Rating – Hot Operating Amps	72 Amps
Recommended Battery Rating	Minimum 650 cca/825mca/150 Ah

¹Power Rated in Accordance with NMMA (National Marine Manufacturers’ Association) rating procedures.

²Power Rated in Accordance with SAV1 rating procedures. Horsepower differences shown result from differences in test rpm, allowable test tolerances, and/or installation of special kit components.

³ Measure using an accurate service tachometer with engine at normal operating temperature.

⁴A special procedure must be followed to check or adjust timing. Consult your Authorized Mercury MerCruiser Dealer before attempting this procedure.

⁶Idle speed on EFI models is not adjustable.

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Mercruiser 350 CID / 5.7L Gen + Marine Engine Specifications

Wednesday, February 15th, 2012

I want to see the available 5.7L Marine Longblock Options in the Online Store……(Read More)

Unit Of Measurement

In. (mm)

Model

350 CID / 5.7L

Displacement

350 CID (5.7 Liter)

Bore

4.00(101.6)

Stroke

3.48(88.4)

Compression Ratio

9.4:1

Heads

Cast Iron

Intake Manifold

Cast Aluminum

Block

Cast Iron (2 Bolt Main Bearing Caps)

Rods

Powdered Metal

Crankshaft

Cast Iron

Pistons

Cast Aluminum

Camshaft

Steel

350 CID Gen + Engine Specifications

Unit Of Measurement

In. (mm)

NOTE: These specifications cover only Gen + engines.

CYLINDER BORE

Diameter			4.0007-4.0017 (101.618-101.643)
Out Of Round		Production	.0005(0.12) Max
		Service	.002(0.05) Max
Taper	Production	Thrust Side	.0005(0.012) Max
		Relief Side	.001(0.025) Max
	Service		.001(0.025) Over Production

PISTON CLEARANCE

Production	.0007-.0021(0.018-0.053) Max
Service	.0027(0.068) Max

PISTON RING: COMPRESSION

Groove Clearance	Production	Top	.0012-.0032(0.030-0.081)
		2^nd
	Service		High Limit Production + .001(0.025)
Gap	Production	Top	.010-.020(0.25-0.51)
		2^nd	.018-.026(0.46-0.66)
	Service		High Limit Production + .010(0.25)

PISTON RING: OIL

Groove Clearance	Production	.002-.007(0.051-0.17)
Groove Clearance	Service	High Limit Production + .001(0.025)
Gap	Production	.010-.030(0.25-0.76)
Gap	Service Limit	High Limit Production + .001(0.25)

PISTON PIN

Diameter		.9270-.9271(23.545-23.548)
Clearance	Production	.0004-.0008(0.0120-0.0210)
	Service Limit	.0040(0.025) Max
Fit in Rod		.0008-.0016(0.021-0.40) Interference

CRANKSHAFT

Main

Journal

Diameter

No. 1

2.4484-2.4493(62.189-62.212)

No. 2, 3, 4

2.4481-2.4490(62.182-62.205)

No. 5

2.4479-2.4488(62.177-62.199)

Taper

Production

.0002(0.005) Max

Service

.001(0.025) Max

Out of Round

Production

.0002(0.005) Max

Service

.001(0.005) Max

Main Bearing

Clearance

Production

No. 1

.0007-.0021(0.018-0.053)

No. 2, 3, 4

.0022-.00610(0.0009-0.0024)

No. 5

.00250-.00690(0.0010-0.0027)

Service

No. 1

.0010-.0020(0.250-0.510)

No. 2, 3, 4

.0010-.0025(0.0250-0.0640)

No. 5

.0025-.0035(0.0760-0.0380)

Crankshaft End Play

.002-.008(0.0500-0.2000)

Connecting Rod

Journal

Diameter

2.0978-2.0998(53.2840-53.3340)

Taper

Production

.0003(0.007) Max

Service

.001(0.025) Max

Out of Round

Production

.0003(0.007) Max

Service

.001(0.025) Max

Rod Bearing Clearance

Production

.0006-.0014(0.16-0.35)

Service

.0010-.0030(0.025-0.076)

Rod Side Clearance

.006-.014(0.15-0.35)

VALVE SYSTEM

Lifter Type			Roller Hydraulic
Rocker Arm Ratio			1.50 to 1
Valve Lift		Intake	.431(10.947)
		Exhaust	.450(11.43)
Valve Lash (Intake & Exhaust)			1 Turn Down from Zero Lash
Face Angle (Intake & Exhaust)			45°
Seat Angle (Intake & Exhaust)			46°
Seat Runout (Intake & Exhaust)			.002(0.05) Max
Seat Width		Intake	.040-.0625(1.02-1.65)
		Exhaust	.065-.098(1.65-2.49)
Stem Clearance	Production	Intake	.0010-.0027(0.025-0.069)
		Exhaust	.0010-.0027(0.025-0.069)
	Service	Intake	High Limit Production + .001(0.025)
		Exhaust	High Limit Production + .0002(0.050)

VALVE SPRING

Valve Spring	Free Length		2.02(51.3)
	Pressure	Valve Closed	76-84 Lb. Ft.(338-374N) at 1.70(43.18)
	Pressure	Valve Open	187-203 Lb. Ft. (832-903 N) at 1.27(32.26)
	Installed Height	Intake	1.69-1.71(42.92-43.43)

350 Gen + Engine Specifications

Unit Of Measurement

In. (mm)

CAMSHAFT

Lobe Lift + .002(0.051)	Exhaust	.300(7.62)
	Intake	.287(7.289)
Duration at .050 In. (1.27 mm) Cam Lift	Exhaust	.294(7.467)
	Intake	.307(7.797)
Journal Diameter		1.8682-1.8692(47.440-47.490)
End Play		.011-0.030(0.004-0.0012)
Timing Chain Deflection [LH Rotation]		.375(9.5) from taut position [total .75(19)]

FLYWHEEL

Runout

.008(0.203) Max

CYLINDER HEAD

Gasket Surface Flatness

.004(0.10) Overall Maximum

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Mercruiser 5.0L Marine Engine Specifications

Wednesday, February 15th, 2012

(5.0L V-8 Models)

Models	5.0L	5.0L EFI
Propshaft Horsepower	220¹	240¹
Propshaft Kilowatts	164¹	179¹
Displacement	305 cid (5.0 l)
Maximum rpm @ WOT³	4400-4800 rpm
Idle rpm in NEUTRAL³	650 rpm⁵	600 rpm⁶
Oil Pressure @ 2000 rpm	30-60 psi (207-414 kPa)
Min. Oil Pressure @ Idle	4 psi (28 kPa)
Thermostat	160^oF (71^o C)
Timing @ Idle rpm⁴	10^o BTDC	8^o BTDC
Firing Order	1-8-4-3-6-5-7-2
Electrical System	12-Volt Negative (-) Ground
Alternator Rating – Hot Operating Amps	65 Amps
Alternator Rating – Cold Operating Amps	72 Amps
Recommended Battery Rating (Minimum)	375 cca/475 mca/90 Ah	550 cca/700 mca/120 Ah

¹ Power Rated in Accordance with NMMA (National Marine Manufacturers’ Association) rating procedures.
² Power Rated in Accordance with SAV 1 rating procedures. Horsepower differences shown result from differences in test rpm, allowable test tolerances, and/or installation of special kit components.
³ Measured using an accurate service tachometer with engine at normal operating temperature.
⁴A special procedure must be followed to check or adjust timing. Consult your Authorized mercury MerCruiser Dealer before attempting this procedure.
⁵A special procedure must be followed to adjust idle rpm. Consult your Authorized Mercury MerCruiser Dealer before attempting this procedure.

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262 cid / 4.3L Gen + Marine Engine Specifications

Wednesday, February 15th, 2012

Unit of Measurement

In. (mm)

Displacement	262 CID (4.3 Liter)
Bore	4.00 (101.6)
Stroke	3.48 (88.39)
Compression Ratio	9.3:1
Heads	Cast Iron
Intake Manifold	Cast Iron
Block	Cast Iron (2 Bolt Main Bearing Caps)
Rods	Forges Steel
Pistons	Cast Aluminum
Crankshaft	Cast Iron
Camshaft	Steel

CYLINDER BORE

Diameter			4.0007-4.0017(101.618-101.643)
Out of Round		Production	.001 (0.025) Maximum
		Service	.002 (0.051) Maximum
Taper	Production	Thrust Side	.0005 (0.012) Maximum
		Relief Side	.001 (0.025) Maximum
	Service		.001 (0.025) Maximum

PISTON CLEARANCE

Production	.0007-.002 (0.017-0.05)
Service	.0024 (.001)

PISTON RING: COMPRESSION (MEASURE IN CYLINDER BORE)

Groove Clearance	Production	Top	.02-.06 (0.51-1.52)
		2^nd	.04-.08 (1.02-2.03)
	Service		.0042 (0.107) Maximum
Gap		Top	.010-.016 (0.25-0.40)
		2^nd	.018-.026 (.046-.066) Maximum
	Service		.06-.035 (1.524-0.88) Maximum

PISTON RING: OIL

Groove Clearance	Production	.002-.007 (0.51-0.20)
Groove Clearance	Service	.02-.08 (0.51-2.032)
Gap	Production	.015-.050 (0.38-1.27)
Gap	Service Limit	.009-.065 (0.23-1.65)

PISTON PIN

Diameter		.9267-.9271 (23.545-23.548)
Clearance	Production	.0002-.0007 (0.005-0.0178)
	Service Limit	.001 (0.025) Maximum
Fit in Rod		.0008-.0016 (0.021-0.040) Interference

CRANKSHAFT

Main Journal	Diameter	No. 1	2.4488-2.4495 (62.199-62.217)
		No. 2, 3	2.4485-2.4494 (62.191-62.215)
		No. 4	2.4479-2.4489 (62.179-62.203)
	Taper	Production	.0003 (0.007) Maximum
	Taper	Service	.001 (0.025) Maximum
	Out of Round	Production	.0002 (0.005) Maximum
	Out of Round	Service	.001 (0.025) Maximum
Main Bearing Clearance	Production	No. 1	.0008-.0020 (0.020-0.051)
	Production	No. 2, 3, 4	.001-.025 (0.025-0.635)
	Service	No. 1, 2, 3, 4	.001-.002 (0.030-0.051)
Crankshaft End Play			.002-.008 (0.05-0.20)
Connecting Rod Journal	Diameter		2.2487-2.2497 (57.117-57.142)
	Taper	Production	.0003 (0.007) Maximum
	Taper	Service	.001 (0.025) Maximum
	Out of Round	Production	.0002 (0.0051) Maximum
	Out of Round	Service	.001 (0.025) Maximum
Rod Bearing Clearance		Production	.0013-.0035 (0.033-0.088)
Rod Bearing Clearance		Service	.001-.003 (0.025-0.076)
Rod Side Clearance			.006-.017 (0.15-0.43)
Crankshaft Runout			.001 (0.025) Maximum

VALVE SYSTEM

Lifter			Hydraulic Roller
Rocker Arm Ratio			1.50 to 1
Valve Lift		Intake	.414 (10.52)
		Exhaust	.428 (10.87)
Valve Lash (Intake & Exhaust)			Net Lash No Adjustment
Face Angle (Intake & Exhaust)			45°
Seat Angle (Intake & Exhaust)			46°
Seat Runout (Intake & Exhaust)			.002 (0.05) Maximum
Seat Width		Intake	.035-.060 (0.89-1.52)
		Exhaust	.062-.093 (1.58-2.38)
Stem Clearance	Production	Intake	.0010-.0027 (0.025-0.069)
		Exhaust
	Service	Intake	.001 (0.025) Maximum
		Exhaust	.002 (0.51) Maximum
Stem Diameter		Intake	.34-.3407 (8.636-8.653)
		Exhaust
Valve Margin (Intake & Exhaust)			.031 (0.79)

VALVE SPRING

Valve Spring	Free Length		2.03 (51.6)
	Pressure	Valve Closed	76-84 Lb. (338-374 N) at 1.7 in (43.16 mm)
		Valve Open	187-203 Lb. (832-903 N) at 1.27 in (32.25 mm)
	Installed Height		1.690-1.710 in (42.93-43.43 mm)

CAMSHAFT AND DRIVE

Lobe Lift + .002(0.051)	Intake	.286-.290 (7.26-7.36)
	Exhaust	.292-.296 (7.42-7.52)
Journal Diameter		1.8682-1.8692 (47.452-47.478)
Journal Out of Round		.001 (0.025) Maximum
Camshaft Runout		.002 (0.051) Maximum
Camshaft End Play		.001-.009 (0.0254-0.2286)
Timing Chain Deflection		.375 (9.5) from taut position [total .75 (19)]

FLYWHEEL

Runout

.008 (0.203) Maximum

CYLINDER HEAD

Gasket Surface Flatness

.010 (0.254) Overall Maximum

BALANCE SHAFT

Front Bearing Journal	2.1648-2.1654 (54.985-55.001)
Rear Bearing Journal	1.4994-1.500 (38.084-38.100)
Rear Bearing Journal Clearance	.001-.0036 (.025-.091)

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MerCruiser 3.0L Marine Engine Mechanical Specifications | Longblock Pricing

Wednesday, February 15th, 2012

30_cover

MerCruiser 3.0L Longblocks

Mercruiser Bobtail 3.0L Alpha "CPO" Engine p/n 8M0072497

MerCruiser 3.0L Bobtail Engines

Capture

MerCruiser 3.0L Engine Diagrams

Lubricants/Sealers/Adhesives

PART NUMBER	DESCRIPTION
Quicksilver Perfect Seal	92-34227-1
Quicksilver 2-C-4 Marine Lubricant with Teflon	92-825407A3
Quicksilver RTV Sealer	92-91601-1

181 CID/ 3.0L Torque Specifications

DESCRIPTION	Lb. In.	Lb. Ft.	N^.m
Camshaft Sprocket Bolts	80		9
Connecting Rod Cap Nuts		45	61
Cylinder Head Bolts		90 (Note 1)	122 (Note 1)
Distributor Clamp		20	27
Marine Engine Coupler to Flywheel		35	47
Flywheel Housing to Block		21	28
Flywheel to Crankshaft Bolts		65	88
Front Cover Bolts	30		3.4
Front Mount to Block		21	28
Main Bearing Cap Bolts		65	88
Manifold to Head		23 (Note 2)	31 (Note 2)
Oil Pan Bolts-Crankcase	80		9
Oil Pan Bolts-to Front Cover	45		5
Oil Pan Studs to Oil Seal Retainer or Crankcase	15		1.7
Oil Pump Cover	72		8
Oil Pump to Block	120		14
Oil Pump Pickup	60		7
Rocker Arm Cover and Bolts	40		4.5
Rear Crankshaft Oil Seal Retainer Nuts	135		15
Spark Plugs		22	30
Starter Motor to Block		37	50
Timing Gear Cover	72		8
Torsional Damper Bolt		50	68
Water Pump to Block		15	20

Note 1: Retorque after first 20 hours of operation.

Note 2: Retorque after first start up.

181 CID / 3.0L Engine Specifications

UNIT OF MEASUREMENT

In. (mm)

CYLINDER BORE

Diameter

3.9995-4.0025(101.588-101.790)

Out of Round

Production

.0005(0.012) Max

Service

.002(0.05) Max

Taper

Production

Thrust Side

.0005(0.012) Max

Relief Side

.0005(0.012) Max

Service

.001(0.02) Max

PISTON CLEARANCE

Production	.0025-.0035(0.064-0.088) Max
Service	.0035(0.08) Max

PISTON RING: COMPRESSION

Groove Clearance	Production	Top	.0012-.0029(0.030-0.073)
		2^nd
	Service		.003(0.09) Max
Gap	Production	Top	.010-.020(0.254-0.762)
		2^nd
	Service		.035(0.88) Max

PISTON RING: OIL

Groove Clearance	Production	.001-.006(0.026-0.152)
Groove Clearance	Service Limit	.007(0.17) Max
Gap	Production	.010-.030(0.254-0.762) Max
Gap	Service Limit	.040(1.01) Max

PISTON PIN

Diameter

.9270-.9271(23.546-23.550)

Clearance

Production

.0003-.0006(0.008-0.016)

Service Limit

.001(0.02) Max

Fit in Rod

.0008-.0019(0.020-0.050) Interference

181 CID / 3.0L Engine Specifications

Main Journal	Diameter		2.2979-2.294(58.367-58.404)
	Taper	Production	.0002(0.005) Max
	Taper	Service	.001(0.02) Max
	Out of Round	Production	.0002(0.005) Max
	Out of Round	Service	.001(0.02) Max
Main Bearing Clearance	Production	No. 1-No. 4	.001-.0024(0.025-0.060)
	Service	No. 5	.0016-.0035(0.041-0.088)
	Production	No. 1-No. 4	.001-.0025(0.03-0.06)
	Service	No. 5	.002-.0035(0.05-0.08)
Crankshaft End Play			.002-.006(0.05-0.15)
Crankpin	Diameter		2.09980-2.0995(53.289-53.327)
	Taper	Production	.0003(0.007) Max
	Taper	Service	.001(0.02) Max
	Out of Round	Production	.0002(0.51) Max
	Out of Round	Service	.001(0.02) Max
Rod Bearing Clearance	Production		.0017-.0027(0.044-0.0686)
Rod Bearing Clearance	Service		N/A
Rod Size Clearance			.006-.017(0.153-0.4318) Max

CAMSHAFT

Lobe Lift (Max.)	Intake	.2529(6.425)
	Exhaust	.2529(6.425)
Journal Diameter		1.8677-1.8697(47.440-47.490)
Camshaft End Play		.003-.008(0.08-0.2032) Max

CYLINDER HEAD

Gasket Surface Flatness

.003-.008 in any 6 in. (152)

or .007(0.15) Overall Maximum

181 CID / 3.0L Engine Specifications

VALVE SYSTEM

Lifter

Hydraulic

Rocker Arm Ratio

1.75 to 1

Collapsed Tappet Gap

¾ Turn Down from Zero Lash

Face Angle

Intake

45^o

Exhaust

45^o

Seat Angle (Intake & Exhaust)

46^o

Seat Runout (Intake and Exhaust)

.002(0.05) Max

Seat Width

Intake

1/16 [.0625] in. (1.16 mm)

Exhaust

1/16-5/64[.0625-.07812] in. (1.6-2.0 mm)

Stem

Clearance

Production

Intake

.0010-.0027(0.025-0.069)

Exhaust

.0007-.0027(0.018-0.069)

Service

Intake

.003(0.09) Max

Exhaust

.004(0.11) Max

Spring

Free Length

2-1/16(52)

Pressure

Valve Closed

100-110 lb. (136-149 N) at 1-19/32 in. (41 mm)

Valve Open

208-220 lb. (282-300 N) at 1-7/32 in. (31 mm)

Installed Height+

.031(8)

Intake

1/32[1.6562] (42)

Exhaust

Internal Damper

None

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Mercruiser 3.0L Marine Engine Performance Specifications & Pricing

Wednesday, February 15th, 2012

Shop for a New……..3.0L Marine Longblocks

Mercruiser 3.0L Engine Diagrams

(4 Cyl. Models)

Models	3.0L
Crankshaft Horsepower (SAV1 Rating)	135¹ (114²)
Propshaft Horsepower (SAV1 Rating)	101¹ (85²)
Displacement	181 cid (3.0L)
Maximum rpm @ WOT³	4400-4800 rpm
Idle rpm in NEUTRAL³	700 rpm
Oil Pressure @ 2000 rpm	30-60 psi (207-414 kPa)
Min. Oil Pressure @ Idle	4 psi (28 kPa)
Thermostat	160°F (71°C)
Timing @ Idle rpm⁴	2°ATDC
Firing Order	1-3-4-2
Electrical System	12-Volt Negative (-) Ground
Alternator Rating – Hot Operating Amps	65 Amps
Alternator Rating – Cold Operating Amps	72 Amps
Recommended Battery Rating	Minimum 375 cca/475 mca/90 Ah

¹Power Rated in Accordance with NMMA (National Marine Manufacturers’ Association) rating

procedures.

²Power Rated in Accordance with SAV1 rating procedures. Horsepower differences shown result

from differences in test rpm, allowable test tolerances, and/or installation of special kit components.

³Measured using an accurate service tachometer with engine at normal operating temperature.

⁴ A special procedure must be followed to check or adjust timing. Consult your Authorized Mercury

MerCruiser Dealer before attempting this procedure.

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