MTD 75 series User Manual

61/65/70/75 Series Horizontal Shaft Engines
114
Engine specifications chart
61 65
minimum maximum minimum maximum
SAE mm SAE mm SAE mm SAE mm
Displacement 7.5 cu in 123 cc 10.9 cu in 179 cc
Bore 2.402 61.005 2.402 61.015 2.559 65.005 2.560 65.015
Stroke 1.654 42.000 1.654 42.000 2.126 54.000 2.126 54.000
Compression Ratio 8.7:1 8.7:1
Cranking Pressure 40 - 70 psi (2.8 - 4.8 bar) 40 - 70 psi (2.8 - 4.8 bar)
Module air gap 0.016 0.400 0.024 0.600 0.016 0.400 0.024 0.600
Spark plug gap 0.024 0.600 0.031 0.800 0.024 0.600 0.031 0.800
Intake valve lash 0.004 0.100 0.006 0.150 0.004 0.100 0.006 0.150
Exhaust valve lash 0.006 0.150 0.008 0.200 0.006 0.150 0.008 0.200
Crankshaft end play 0.000 0.000 0.014 0.350 0.000 0.000 0.011 0.275
Crank pin diameter 1.031 26.184 1.031 26.193 1.181 29.985 1.181 29.995
Crankshaft journal OD
(flywheel end)
0.983 24.980 0.984 24.993 0.983 24.980 0.984 24.993
Crankshaft journal OD
(PTO end)
0.983 24.980 0.984 24.993 0.983 24.980 0.984 24.993
Connecting rod max. ID
(crank side)
1.032 26.210 1.032 26.220 1.182 30.015 1.191 30.250
Connecting rod max. ID
(piston side)
0.520 13.204 0.520 13.212 0.717 18.204 0.717 18.212
Piston pin 0.519 13.192 0.520 13.198 0.716 18.190 0.716 18.198
Piston pin bore 0.520 13.202 0.520 13.208 0.717 18.202 0.717 18.210
Connecting rod to crank
pin running clearance
0.001 0.017 0.001 0.036 0.001 0.020 0.002 0.040
Crankshaft bearing ID
(sump)
2.045 51.949 2.046 51.979 2.045 51.949 2.046 51.979
Cam shaft OD
(cylinder block)
0.558 14.166 0.558 14.184 0.558 14.166 0.558 14.184
Cam shaft OD
(sump side)
0.558 14.166 0.558 14.184 0.558 14.166 0.558 14.184
Cam shaft bearing ID
(cylinder block)
0.559 14.200 0.560 14.218 0.559 14.200 0.560 14.218

MTD 75 series Specifications

General

Brand	MTD
Model	75 series
Category	Engine
Language	English