Tecumseh V-twin User Manual

10-1
CHAPTER 10. ENGINE SPECIFICATIONS
TVT 691 ENGINE SPECIFICATIONS
English Std. Metric
Displacement 42.18 cubic inches 691cc
Stroke 2.75 69.85
Bore 3.126 79.4004
3.125 79.375
PISTONS
Piston Diameter 3.1220 79.2988
3.1235 79.3369
Piston Pin Diameter .6248 15.870
Piston Pin Bore Diameter .6251 15.878
.6257 15.893
Piston , Top and Middle Ring Grooves .0645 1.638
.0665 1.689
Piston, Lower Ring Groove .1255 3.188
.1275 3.239
Piston Ring Side Clearance .002 - .005 Top .0890
.001 - .004 Center .0640
.001 - .004 Bottom .0640
Piston Ring End Gaps .007-.015 – Top .178-.381
.013-.021 – Center .330-.533
.005 -.013 – Bottom .127-.330
VALVES
Valve lash Both .004 Both .102
Valve Seat Angle - Cylinder Head Both 46 Degrees Both 46 Degrees
Valve Seat Width - Cylinder Head Both .042 Both 1.067
.052 1.321
Valve Face Angle Both 45 Degrees Both 45 Degrees
Valve Stem Diameter Exhaust .3080 7.823
.3085 7.836
Valve Stem Diameter Intake .3095 7.861
.310 7.874
Standard Valve Guide Dia. .312 7.925
.313 7.950
Valve Spring Free Length 1.935 49.15
1.995 50.67

Tecumseh V-twin Specifications

General

Brand	Tecumseh
Model	V-twin
Category	Engine
Language	English