MerCruiser 3.0L Marine Engine Mechanical Specifications | Longblock Pricing
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) |
2nd |
|||
Service |
.003(0.09) Max |
||
Gap |
Production |
Top |
.010-.020(0.254-0.762) |
2nd |
|||
Service |
.035(0.88) Max |
PISTON RING: OIL
Groove Clearance |
Production |
.001-.006(0.026-0.152) |
Service Limit |
.007(0.17) Max |
|
Gap |
Production |
.010-.030(0.254-0.762) Max |
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 |
|
Service |
.001(0.02) Max |
||
Out of Round |
Production |
.0002(0.005) Max |
|
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 |
|
Service |
.001(0.02) Max |
||
Out of Round |
Production |
.0002(0.51) Max |
|
Service |
.001(0.02) Max |
||
Rod Bearing Clearance |
Production |
.0017-.0027(0.044-0.0686) |
|
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
|
45o
|
|
Exhaust
|
45o
|
||
Seat Angle (Intake & Exhaust)
|
46o
|
||
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
|