Briggs And Stratton Repair Articles

SPECIFICATIONS FOR BRIGGS AND STRATTON INTEK V-TWIN OHV ENGINES

These Briggs and Stratton engines are used in various equipment, most common in lawnmowers, here are the most common specifications for intek v-twin OVH engines. More guides and manuals on this website for Briggs and Stratton engines including complete service manuals, parts list, operator manuals, and repair articles.

COMMON SPECIFICATIONS FOR BRIGGS AND STRATTON INTEK V-TWIN OHV ENGINES

MODEL SERIES BORE

STROKE

DISPLACEMENT

405777… 2.970″ (75.44mm)……

445777…………. 3.120″ (79.25mm)……

2.890″ (73.40mm)…..

2.890″ (73.40mm)…..

40.0 cu. In. (656cc)

44.2 cu. In. (724cc)

Armature Air Gap… 008″-.012″ (0.20 – 0.30mm)

Crankshaft End Play…………………… .002″-.030″ (0.05 – 0.76mm)

**Governed Idle Speed (all models)… 1750RPM

Spark Plug Gap… 030″ (0.76mm)

Valve Clearance (Cold)-Int.-Exh………. .004″-.006″ (0.10 – 0.15mm)

**Top Governed Speed: See B&S Sales Manual MS-4052

STANDARD AND REJECT DIMENSIONS

Description Standard Dimensions Reject Dimensions

Cylinder

Bore

Model 405777………………….. 2.969″-2.970″ (75.41-75.44mm).. 2.973″ (75.51mm)

Model 445777…………………… 3.119″-3.120″ (79.22-79.25mm).. 3.1235″ (79.33mm)

Out of round – All:… 0015″ (0.04mm)

Main Bearing MAG… 1.379″-1.3805″ (35.02-35.06mm). 1.383″ (35.12mm) Cam Bearing MAG… .6255″-.626″ (15.88-15.90mm)… .6275″ (15.93mm)

Cylinder Head

Valve Guide…………. .2374″-.2383″ (6.03-6.05mm)… 240″ (6.09mm)

Valve Stem………….. .2345″-.235″ (5.97-5.98mm)… 233″ (5.92mm)

Sump

Main Bearing PTO…. 1.6268″-1.6275″ (41.32-41.34mm 1.629″ (41.37mm) Cam Bearing PTO….. .6255″-.626″ (15.88-15.90mm)…. .6275″ (15.93mm)

Crankshaft

Crankpin……………. 1.4982″-1.499″ (38.05-38.07mm) 1.4965″ (38.01mm)

Magneto Journal…… 1.3776″-1.3784″ (34.99-35.01mm 1.376″ (34.95mm)

PTO Journal………… 1.6241″-1.6249″ (41.25-41.27mm 1.623″ (41.22mm)

Cam Shaft

Journals…………….. .624″-.625″ (15.85-15.87mm)… 623″ (15.82mm)

Lobes

Intake……………….. 1.228″-1.231″ (31.19-31.26mm). 1.225″ (31.15mm)

Exhaust…………….. 1.226″-1.229″ (31.14-31.21mm). 1.223″ (31.06mm)

Connecting Rod

Crankpin Bearing…… 1.500″-1.5006″ (38.10-38.11mm) .1.5015″ (38.13mm) Piston Pin Bearing…. .6727″-.673″ (17.08-17.09mm)… .6745″ (17.13mm)

Piston Pin………………………. .6721″-.6726″ (17.07-17.08mm).. .6718″ (17.06mm)

Piston Pin Bearing (Piston)…. .673″-.6735″ (17.09-17.10mm)…. .6745″ (17.13mm)

Piston Ring

Ring End Gap -Top…. .005″-.013″ (0.13-0.33mm)… 030″ (0.76mm)

Center. .014″-.022″ (0.35-0.56mm)… 030″ (0.76mm)

Oil….. .005″-.017″ (0.13-0.43mm)… 030″ (0.76mm)

Ring Side Clearance .002″-.003″ (0.05-0.07mm)… 005″ (0.12mm)

FASTENER SPECIFICATIONS

DESCRIPTION WRENCH/SOCKET SIZE TORQUE

Alternator………………………… 1/4″… 20 in. Lbs. (2.2Nm)

Armature……………………..…… 5/16″… 25 in. Lbs. (2.8Nm)

Back Plate (to cylinder)………… 3/8″… 100 in. Lbs. (11.2Nm)

Blower Housing…………………. 3/8″… 80 in. Lbs. (9.0Nm)

Breather………………………….. 3/8″… 55 in. Lbs. (6.2Nm)

Carburetor (to manifold)………… E-5… 65 in. Lbs. (7.4Nm)

Connecting Rod…………………. 5/16″… 100 in. Lbs. (11.2Nm)

Cylinder Shield………………….. 3/8″… 80 in. Lbs. (9.0Nm)

5/16″… 45 in. Lbs. (5.0Nm)

Exhaust Manifold……………….. 1/2″… 140 in. Lbs. (16.0Nm)

Fan Retainer…………………….. 1/2″… 140 in. Lbs. (16.0Nm)

Fuel Pump (to bracket)………… 3/8″… 80 in. Lbs. (9.0Nm)

Fuel Pump Bracket (to cyl. Shield) 3/8″… 80 in. Lbs. (9.0Nm)

Flywheel 1-1/4″… 150 in. Lbs. (203Nm)

Governor Control Bracket………. 3/8″… 80 in. Lbs. (9.0Nm)

Governor Nut…………………….. 7/16″… 130 in. Lbs. (14.6Nm)

Head Bolts………………………. 1/2″… 220 in. Lbs. (25.0Nm)

Intake Air Horn………………….. 7/16″… 45 in. Lbs. (5.0Nm)

Intake Manifold (to cyl. Head)…. 3/8″ (T-30)… 80 in. Lbs. (9.0Nm)

Oil Drain Plug……………………. 3/8″ Square Drive (internal)… 125 in. Lbs. (14.0Nm)

Oil Pump Cover………………….. T-30… 50 in. Lbs. (5.6Nm)

Rocker Arm………………………. 8mm… 100 in. Lbs. (11.2Nm)

Rocker Arm Lock Nut………….. 13mm… 60 in. Lbs. (6.6Nm)

Rocker Arm Adjustment Screw… T-40

Rotating Screen…………………. 5/16″… 20 in. Lbs. (2.2Nm)

Spark Plugs……………………… 5/8″ mm Deep… 180 in. Lbs. (20.0Nm)

Starter Motor…………………….. 1/2″ (T-40)… 140 in. Lbs. (15.8Nm)

Starter Thru Bolts……………….. 5/16″… 50 in. Lbs. (5.6Nm)

Sump……………………………… 1/2″… 200 in. Lbs. (22.6Nm)

Valley Cover……………………… 5/16″… 45 in. Lbs. (5.0Nm)

Valve Cover………………………. 3/8″… 100 in. Lbs. (11.2Nm)

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