Kohler Single Cylinder Engine Specs | Torque Values and Sequences for Fasteners | Identification & Torque Settings of Most Commonly Used Grades of Bolts

Kohler K-Series and Magnum Single Cylinder Engine Specifications and Tolerances
(All dimensions in inches.)
Model (Horsepower @ 3,600 rpm) K90/K91
(4hp @ 4,000 rpm)
K141 (6¼hp)
K160 (6.6hp)

K161 (7hp)
K181 (8hp) K241 (10hp) K301 (12hp) K321 (14hp)

K341 (16hp)

K361 (18hp)
(Over Head Valve)

General Information

Bore x Stroke STD. 2.375"
.010" 2.385"
.020" 2.395"
.030" 2.405"
x 2.000"
6¼ & 6.6hp - STD. 2.875"
7hp - STD. 2.938"
.010" 2.948"
.020" 2.958"
.030" 2.968"
x 2.500"
STD. 2.938"
.010" 2.948"
.020" 2.958"
.030" 2.968"
x 2.750"
STD. 3.251"
.010" 3.261"
.020" 3.271"
.030" 3.281"
x 2.875"
STD. 3.375"
.010" 3.385"
.020" 3.395"
.030" 3.405"
x 3.250"
STD. 3.500"
.010" 3.510"
.020" 3.520"
.030" 3.530"
x 3.250"
STD. 3.750"
.010" 3.760"
.020" 3.770"
.030" 3.780"
x 3.250"
STD. 3.750"
.010" 3.760"
.020" 3.770"
.030" 3.780"
x 3.250"
Cubic Inch Displacement 8.86 16.23 (6¼hp)
16.95 (7hp)
18.64 23.85 29.07 31.27 35.90 35.90
Compression Ratio ? 5.93:1 (6¼hp)
6.2:1 (7hp)
6.8:1 5:1, 5.4:1 or 7.1:1 (See note 8) 6.1:1, 6.6:1 or 8.6:1 (See note 8) 6.6:1, 7:1 or 9:1 (See note 8) 7.4:1 9.2:1
Operating RPM (maximum) 4,000 3,600 3,600 3,600 3,600 3,600 3,600 3,600

Balance Gear

Shaft O.D. New - - - .4998" (min.)
.5001" (max.)
.4998" (min.)
.5001" (max.)
.4998" (min.)
.5001" (max.)
.4998" (min.)
.5001" (max.)
.4998" (min.)
.5001" (max.)
Wear Limit
(maximum)
- - - .4996" .4996" .4996" .4996" .4996"
End Play - - - .002" (min.)
.010" (max.)
.002" (min.)
.010" (maz.)
.002" (min.)
.010" (max.)
.002" (min.)
.010" (max.)
.002" (min.)
.010" (max.)

Camshaft

End Play (See note 9) .005" (min.)
.020" (max.)
.005" (min.)
.010" (max.)
.005" (min.)
.010" (max.)
.005" (min.)
.010" (max.)
.005" (min.)
.010" (max.)
.005" (min.)
.010" (max.)
.005" (min.)
.010" (max.)
.005" (min.)
.010" (max.)

Connecting Rod

Running Clearance
(See note 9)
Big End Diameter
(maximum)
STD. .938"
.010" .928
STD. 1.1875"
.010" 1.1775"
STD. 1.1875"
.010" 1.1775"
STD. 1.5015"
.010" 1.4915"
.020" 1.4815"
.030" 1.4715"
STD. 1.5015"
.010" 1.4915"
.020" 1.4815"
.030" 1.4715"
STD. 1.5015"
.010" 1.4915"
.020" 1.4815"
.030" 1.4715"
STD. 1.5015"
.010" 1.4915"
.020" 1.4815"
.030" 1.4715"
STD. 1.5015"
.010" 1.4915"
.020" 1.4815"
.030" 1.4715"
Rod to Crankpin .001" (min.)
.0025" (max.)
.001" (min.)
.002" (max.)
.001" (min.)
.002" (max.)
.001" (min.)
.002" (max.)
.001" (min.)
.002" (max.)
.001" (min.)
.002" (max.)
.001" (min.)
.002" (max.)
.001" (min.)
.002" (max.)
Rod to Crankpin Wear Limit
(maximum)
.003" .0025" .0025" .0025" .0025" .0025" .0025" .0025"
Rod to Piston Pin .0007" (min.)
.0008" (max.)
.0006" (min.)
.0011" (max.)
.0006" (min.)
.0011" (max.)
.0003" (min.)
.0008" (max.)
.0003" (min.)
.0008" (max.)
.0003" (min.)
.0008" (max.)
.0003" (min.)
.0008" (max.)
.0003" (min.)
.0008" (max.)
Rod to Journal Side Clearance .010" (min.)
.025" (max.)
.010" (min.)
.025" (max.)
.010" (min.)
.025" (max.)
.010" (min.)
.025" (max.)
.010" (min.)
.025" (max.)
.010" (min.)
.025" (max.)
.010" (min.)
.025" (max.)
.010" (min.)
.025" (max.)
Wrist Pin Hole (Small End) I.D. .5630" (min.)
.5633" (max.)
.6255" (min.)
.6258" (max.)
.6255" (min.)
.6258" (max.)
.8596" (min.)
.8599" (max.)
.8757" (min.)
.8760" (max.)
.8757" (min.)
.8760" (max.)
.8757" (min.)
.8760" (max.)
.8757" (min.)
.8760" (max.)

Crankshaft

Main PTO and
Flywheel
End O.D.
New (max.) .9844" 1.1814" 1.1814" 1.5749" 1.5749" 1.5749" 1.5749" 1.5749"
Wear Limit
(maximum)
.9841" 1.1811" 1.1811" 1.5745" 1.5745" 1.5745" 1.5745" 1.5745"
Crankpin New (max./min.)
(See note 9)
STD. -
.9360"/.9355"
.010" -
.9260"/.9255"
STD -
1.1860"/1.1855"
.010" -
1.1760"/1.1755"
STD -
1.186"/1.1855"
.010" -
1.176"/1.1755"
STD -
1.4995"/1.5000"
.010" -
1.4895"/1.4900"
.020" -
1.4795"/1.4800"
.030" -
1.4695"/1.4700"
STD -
1.4995"/1.5000"
.010" -
1.4895"/1.4900"
.020" -
1.4795"/1.4800"
.030" -
1.4695"/1.4700"
STD -
1.4995"/1.5000"
.010" -
1.4895"/1.4900"
.020" -
1.4795"/1.4800"
.030" -
1.4695"/1.4700"
STD -
1.4995"/1.5000"
.010" -
1.4895"/1.4900"
.020" -
1.4795"/1.4800"
.030" -
1.4695"/1.4700"
STD -
1.4995"/1.5000"
.010" -
1.4895"/1.4900"
.020" -
1.4795"/1.4800"
.030" -
1.4695"/1.4700"
Wear Limit
(maximum)
STD. .9350"
.010" .9340"
STD. 1.1850"
.010" 1.1840"
STD. 1.1850"
.010" 1.1840"
STD. 1.4990"
.010" 1.4890"
.010" 1.4790"
.010" 1.4690"
STD. 1.4990"
.010" 1.4890"
.010" 1.4790"
.010" 1.4690"
STD. 1.4990"
.010" 1.4890"
.010" 1.4790"
.010" 1.4690"
STD. 1.4990"
.010" 1.4890"
.010" 1.4790"
.010" 1.4690"
STD. 1.4990"
.010" 1.4890"
.010" 1.4790"
.010" 1.4690"
Out of Round (maximum) .0005" .0005" .0005" .0005" .0005" .0005" .0005" .0005"
Taper (max.) .001" .001" .001" .001" .001" .001" .001" .001"
End Play (See note 9) .004" (min.)
.023" (max.)
.002" (min.)
.023" (max.)
.002" (min.)
.023" (max.)
.003" (min.)
.020" (max.)
.003" (min.)
.020" (max.)
.003" (min.)
.020" (max.)
.003" (min.)
.020" (max.)
.003" (min.)
.020" (max.)

Cylinder Bore

Standard Size Cylinder Bore Diameter New (See note 9) 2.3745" - 2.3755" (max.) 2.9370" - 2.9380" (max.) 2.9370" - 2.9380" (max.) 3.2505" - 3.2515" (max.) 3.3745" -
3.3755" (max.)
3.4995" -
3.5005" (max.)
3.7495" - 3.7505" (max.) 3.7495" - 3.7505" (max.)
Maximum Wear Limit 2.378" 2.941" 2.941" 3.254" 3.378" 3.503" 3.753" 3.753"
Cylinder Bore Diameter for Oversize Piston/Rings .010" = 2.385"
.020" = 2.285"
.030" = 2.405"
.010" = 2.9475"
.020" = 2.9575"
.030" = 2.9675"
.010" = 2.9475"
.020" = 2.9575"
.030" = 2.9675"
.010" = 3.260"
.020" = 3.270"
.030" = 3.280"
.010" = 3.385"
.020" = 3.395"
.030" = 3.405"
.010" = 3.510"
.020" = 3.520"
.030" = 3.530"
.010" = 3.760"
.020" = 3.770"
.030" = 3.780"
.010" = 3.760"
.020" = 3.770"
.030" = 3.780"
Maximum Out of Round .003" .003" .003" .003" .003" .003" .003" .003"
Maximum Taper .003" .003" .003" .002" .002" .002" .002" .002"

Cylinder Head

Maximum Out of Flatness .003" .003" .003" .003" .003" .003" .003" .003"

Ignition

Spark Plug - Type and Gap Type (See note 2) RCJ-8 RCJ-8 RCJ-8 RH-10 RH-10 RH-10 RH-10 RH-10
Battery .035" .035" .035" .035" .035" .035" .035" .035"
Magneto .025" .025" .025" .025" .025" .025" .025" .025"
LP/Propane .018" .018" .018" .018" .018" .018" .018" .018"
Nominal Point Gap or Mark on Flywheel / Degrees BTDC .020" or
S mark / 20º
.020" or
S mark / 20º
.020" or
S mark / 20º
.020" or
S mark / 20º
.020" or
S mark / 20º
.020" or
S mark / 20º
.020" or
S mark / 20º
.020" or
S mark / 20º
Model (Horsepower @ 3,600 rpm) K90/K91
(4hp @ 4,000 rpm)
K141 (6¼hp)
K160 (6.6hp)

K161 (7hp)
K181 (8hp) K241 (10hp) K301 (12hp) K321 (14hp) K341 (16hp) K361 (18hp)
(Over Head Valve)

All Pistons

Service Replacement Sizes ß .003" - .010" - .020" - .030" à


(K-series piston)

Thrust Face O.D. (See note 3) New 2.371"/2.369" 2.866" (6¼hp)
2.9297"/2.9281" (7hp)
2.9297"/2.9281" 3.2432"/3.2413" 3.368"/3.365" 3.4941"/3.4925" 3.7425"/3.7410" 3.7425"/3.7410"
Maximum Wear Limits 2.366" 2.925" 2.925" 3.238" 3.363" 3.491" 3.738" 3.738"
Thrust Face to Bore Clearance (max.) (1) .0035"/.006" .007"/.010" .007"/.010" .007"/.010" .007"/.010" .007"/.010" .007"/.010" .007"/.010"
Ring End Gap New Bore .007"/.017" .007"/.017" .007"/.017" .010"/.020" .010"/.020" .010"/.020" .010"/.020" .010"/.020"
Used Bore (Maximum) .027" .027" .027" .030" .030" .030" .030" .030"
Maximum Ring Side Clearance .006" .006" .006" .006" .006" .006" .006" .006"


(K-series piston)

Thrust Face O.D. (See note 5) New - - - - - - 3.7465"/3.7455" 3.7465"/3.7455"
Maximum Wear Limits - - - - - - 3.744 3.744
Thrust Face to Bore Clearance (max.) (See note 1) - - - - - - .0030"/.0050" .0030"/.0050"
Ring End Gap (See note 9) New Bore (See note 6) - - - - - - .010"/.020" .010"/.020"
Used Bore (Maximum) (See note 6) - - - - - - .030" .030"
Maximum Ring Side Clearance - - - - - - .004" .004"


(Mahle piston)

Thrust Face O.D. (See notes 5, 9) New / Used - - 2.9329" (min.)
2.9336" (max.)
- 3.3700" (min.)
3.3693" (max.)
3.4945" (min.) 3.4938" (max.) 3.7433"/3.7426" 3.7433"/3.7426"
Maximum Wear Limits - - 2.931" - 3.367" 3.492" 3.7406" 3.7406"
Thrust Face to Bore Clearance (See notes 1, 9) - - .0034" (min.)
.0051" (max.)
- .0045" (min.)
.0062" (max.)
.0050" (min.)
.0067" (max.)
.0062" (min.)
.0079" (max.)
.0062" (min.)
.0079" (max.)
Ring End Gap (See note 9) New Bore (See note 6) - - .010"/.023" - .010"/.020" .010"/.020" .013"/.025" .013"/.025"
Used Bore (Maximum) (See note 6) - - .032" - .030" .030" .033" .033"
Maximum Ring Side Clearance - - .006" - .006" .006" .004" .004"
Wrist Pin Outside Diameter (min.-max.) .5623" - .5625" .6247" - .6249" .6247" - .6249" .8591" - .8593" .8752" - .8754" .8752" - .8754" .8752" - .8754" .8752" - .8754"
Model (Horsepower @ 3,600 rpm) K90/K91
(4hp @ 4,000 rpm)
K141 (6¼hp)
K160 (6.6hp)

K161 (7hp)
K181 (8hp) K241 (10hp) K301 (12hp) K321 (14hp) K341 (16hp) K361 (18hp)
(Over Head Valve)

Valves

Valve Head Diameter Intake: 15/16"
Exhaust: ?
Intake: 1-3/8"
Exhaust: 1-1/8"
Intake: 1-3/8"
Exhaust: 1-1/8"
Intake: 1-3/8"
Exhaust: 1-1/8"
Intake: 1-3/8"
Exhaust: 1-1/8"
Intake: 1-3/8"
Exhaust: 1-1/8" (early) / 1-3/8" (late)
Intake: 1-3/8"
Exhaust: 1-3/8"
Intake: 1.438"
Exhaust: 1.400"
Guide Reamer Size .250" .3125" .3125" .3125" .3125" .3125" .3125" .3125"
Tappet Clearance (Cold) (See notes 4, 9) Intake
(min.-max.)
.005"- .009" .006" - .008" .006" - .008" .008" - .010" .008" - .010" .008" - .010" .008" - .010" .005" - .008"
Exhaust
(min.-max.)
.011" - .015" .017" - .019" .017" - .019" .017" - .019" .017" - .019" .017" - .019" .017" - .019" .010" - .012"
Minimum Lift (Zero Lash) Intake .2035" .2718" .2718" .318" .318" .318" .318" .318"
Exhaust .1768" .2482" .2482" .318" .318" .318" .318" .318"
Minimum Stem O.D. Intake .2478" .3103" .3103" .3103" .3103" .3103" .3103" .3103"
Exhaust .2458" .3088" .3088" .3074" .3074" .3074" .3074" .3074"
Face / Seat Angle 45º / 46º 45º / 46º 45º / 46º 45º / 46º 45º / 46º 45º / 46º 45º / 46º 45º / 46º
Guide I.D. Maximum Wear Limit (See note 1) Intake .005" .005" .005" .006" .006" .006" .006" .006"
Exhaust .007" .007" .007" .008" .008" .008" .008" .008"
Lifter to Bore Clearance .001" - .0015" .001" - .0015" .001" - .0015" .001" - .0015" .001" - .0015" .001" - .0015" .001" - .0015" .001" - .0015"

NOTES
Note 1 - Subtract O.D. of inner part from I.D. of outer part. The lesser clearance is for up to 3,600 rpm operation, and the greater clearance is for higher rpm operation. And if the lifter bores need to be reamed for installation of bronze bushings, just like the valves, the lifters are offset at a 4 degree angle.
Note 2 - Champion spark plugs or equivalent.
Note 3 - Measure just below oil ring groove and at right angles to wrist pin.
Note 4 - 1,800 RPM generator sets at .005"/ 007".
Note 5 - Measure 1/2" above the bottom of the piston skirt.
Note 6 - Top and center compression rings.
Note 7 - Measure just below oil ring groove and at right angles to wrist pin.
Note 8 - Compression ratio depends on which cylinder head is used.
Note 9 - The lesser clearance is for up to 3,600 rpm operation, and the greater clearance is for higher rpm operation. Also, the maximum is for a fresh valve job. Because as the valves and seats wear into each other, the clearances will be lessened.


Single Cylinder Kohler Magnum Engine Specifications and Tolerances Top of Page
All dimensions in inches.
Model (Horsepower @ 3,600 rpm) M8 (8hp) M10 (10hp) M12 (12hp) M14 (14hp) M16 (16hp)

General Information

Bore x Stroke STD. 2.938"
.010" 2.948"
.020" 2.958"
.030" 2.968"
x 2.750"
STD. 3.251"
.010" 3.261"
.020" 3.271"
.030" 3.281"
x 2.875"
STD. 3.375"
.010" 3.385"
.020" 3.395"
.030" 3.405"
x 3.250"
STD. 3.500"
.010" 3.510"
.020" 3.520"
.030" 3.530"
x 3.250"
STD. 3.750"
.010" 3.760"
.020" 3.770"
.030" 3.780"
x 3.250"
Cubic Inch Displacement 18.64 23.85 29.07 31.27 35.90
Operating RPM (maximum) 3,600 3,600 3,600 3,600 3,600

Balance Gear

Shaft O.D.

New

- .4998"/.5001" .4998"/.5001" .4998"/.5001" .4998"/.5001"
Maximum Wear Limit - .4996" .4996" .4996" .4996"
End Play - .002"/.010" .002"/.010" .002"/.010" .002"/.010"
Camshaft End Play (See note 6) .005"/.010" .005"/.010" .005"/.010" .005"/.010" .005"/.010"

Connecting
Rod

Running Clearance Maximum Big End Diameter STD. 1.1875"
.010" 1.1775"
STD. 1.5015"
.010" 1.4915"
.020" 1.4815"
.030" 1.4715"
STD. 1.5015"
.010" 1.4915"
.020" 1.4815"
.030" 1.4715"
STD. 1.5015"
.010" 1.4915"
.020" 1.4815"
.030" 1.4715"
STD. 1.5015"
.010" 1.4915"
.020" 1.4815"
.030" 1.4715"
Rod to Crankpin (max.) .001"/.002" .001"/.002" .001"/.002" .001"/.002" .001"/.002"
Rod to Crankpin - Maximum Wear Limit .0025" .0025" .0025" .0025" .0025"
Rod to Wrist Pin (max.) .0006"/.0011" .0003"/.0008" .0003"/.0008" .0003"/.0008" .0003"/.0008"

Rod to Journal Side Clearance
(min.-max.)

.010" - .025" .010" - .025" .010" - .025" .010" - .025" .010" - .025"
Small End I.D. (max.) .6255"/.6258" .8596"/.8599" .8757"/.8760" .8757"/.8760" .8757"/.8760"

Crankshaft

Main PTO & Flywheel End O.D. New 1.1811"/1.1814" 1.5745"/1.5749" 1.5745"/1.5749" 1.5745"/1.5749" 1.5745"/1.5749"
Maximum Wear Limit 1.1811" 1.5745" 1.5745" 1.5745" 1.5745"
Crankpin New - O.D. STD. 1.186"/1.1855"
.010" 1.176"/1.1755"
STD. 1.4995"/1.5000"
.010" 1.4895"/1.4900"
.020" 1.4795"/1.4800"
.030" 1.4695"/1.4700"
STD. 1.4995"/1.5000"
.010" 1.4895"/1.4900"
.020" 1.4795"/1.4800"
.030" 1.4695"/1.4700"
STD. 1.4995"/1.5000"
.010" 1.4895"/1.4900"
.020" 1.4795"/1.4800"
.030" 1.4695"/1.4700"
STD. 1.4995"/1.5000"
.010" 1.4895"/1.4900"
.020" 1.4795"/1.4800"
.030" 1.4695"/1.4700"
Maximum Wear Limit STD. 1.1850"
.010" 1.1840"
STD. 1.4990"
.010" 1.4890"
.010" 1.4790"
.010" 1.4690"
STD. 1.4990"
.010" 1.4890"
.010" 1.4790"
.010" 1.4690
STD. 1.4990"
.010" 1.4890"
.010" 1.4790"
.010" 1.4690
STD. 1.4990"
.010" 1.4890"
.010" 1.4790"
.010" 1.4690
Maximum Out of Round .0005" .0005" .0005" .0005" .0005"
Maximum Taper .001" .001" .001" .001" .001"
End Play (See note 6) .002"/.023" .003"/.020" .003"/.020" .003"/.020" .003"/.020"

Cylinder Bore

Inside Diameter New (See note 6) 2.9370"/2.9380" 3.2505"/3.2515" 3.3745"/3.3755" 3.4995"/3.5005" 3.7495"/3.7505"
Maximum Wear Limit 2.941" 3.254" 3.378" 3.503" 3.753"
Maximum Out of Round (I.D.) .005" .005" .005" .005" .005"
Maximum Taper (I.D.) .003" .002" .002" .002" .002"
Cylinder Head Maximum Out of Flatness .003" .003" .003" .003" .003"

Ignition
(Solid State)

Spark Plug Type (See note 2) RCJ-8 RH-10 RH-10 RH-10 RH-10
Gap .025" .025" .025" .025" .025"
Module Air Gap .012"/.016" .012"/.016" .012"/.016" .012"/.016" .012"/.016"

Model (Horsepower)

M8 (8hp) M10 (10hp) M12 (12hp) M14 (16hp) M16 (16hp)
All Pistons Service Replacement Sizes

ß .003" - .010" - .020" - .030" à


(K-series piston)

Thrust Face O.D. (See note 3) New (See note 6) 2.9297"/2.9281 3.2432"/3.2413 3.368"/3.365 3.4941"/3.4925 -
Maximum Wear Limits 2.925" 3.238" 3.363" 3.491" -
Thrust Face to Bore Clearance (max.) (See notes 1, 6) .007"/.010" .007"/.010" .007"/.010" .007"/.010" -
Ring End Gap
(See note 6)
New Bore .007"/.017" .010"/020" .010"/.020" .010"/.020" -
Used Bore (Maximum) .027" .030" .030" .030" -
Maximum Ring Side Clearance .006" .006" .006" .006" -


(K-series and
Mahle piston)

Thrust Face O.D. (See note 4) New - - - - 3.7465"/3.7455"
Maximum Wear Limits - - - - 3.7435"
Thrust Face to Bore Clearance (max.) (See note 1) - - - - .003"/.005"
Ring End Gap
(See note 6)
New Bore (See note 5) - - - - .010"/020"
Used Bore (Maximum) (See note 5) - - - - .030"
Maximum Ring Side Clearance - - - - .004"


(Mahle piston)

Thrust Face O.D. (See note 4) New (See note 6) 2.9329"/2.9336" - 3.3700"/3.3693" 3.4945"/3.4938" 3.7433"/3.7426"
Maximum Wear Limits 2.9312" - 3.3673" 3.4918" 3.7406"
Thrust Face to Bore Clearance (max.) (See note 1, 6) .0034"/.0051" - .0045"/.0062" .0050"/0067" .0062"/.0079"
Ring End Gap
(See note 6)
New Bore
(See note 5)
.010"/.023" - .010"/.020" .010"/.020" .013"/.025"
Used Bore
(See note 5)
.032" (max.) - .030" (max.) .030" (max.) .033" (max.)
Maximum Ring Side Clearance .006" - .006" .006" .004"
Wrist Pin Outside Diameter .6247" (min.)
.6249" (max.)
.8591" (min.)
.8593" (max.)
.8752" (min.) .8754" (max.) .8752" (min.) .8754" (max.) .8752" (min.) .8754" (max.)

Valves

Valve Head Diameter Intake: 1-3/8"
Exhaust: 1-1/8"
Intake: 1-3/8"
Exhaust: 1-1/8"
Intake: 1-3/8"
Exhaust: 1-1/8"
Intake: 1-3/8"
Exhaust: 1-3/8"
Intake: 1-3/8"
Exhaust: 1-3/8"
Guide Reamer Size .3125" .3125" .3125" .3125" .3125"
Tappet Clearance (Cold) Intake
(min.-max.)
.006" - .008" .008" - .010" .008" - .010" .008" - .010" .008" - .010"
Exhaust
(min.-max.)
.017" - .019" .017" - .019" .017" - .019" .017" - .019" .017" - .019"
Minimum Lift
(Zero Lash)
Intake .2718" .318" .318" .318" .318"
Exhaust .2482" .318" .318" .318" .318"
Minimum Stem O.D. Intake .3103" .3103" .3103" .3103" .3103"
Exhaust .3074" .3074" .3074" .3074" .3074"
Face Angle -
Seat Angle -
45º
46º
45º
46º
45º
46º
45º
46º
45º
46º
Guide I.D. Maximum Wear Limit
(See note 1)
Intake .006" .006" .006" .006" .006"
Exhaust .008" .008" .008" .008" .008"
Lifter to Bore Clearance .001" - .0015" .001" - .0015" .001" - .0015" .001" - .0015" .001" - .0015"

NOTES:
Note 1 - Subtract O.D. of inner part from I.D. of outer part. The lesser clearance is for up to 3,600 rpm operation, and the greater clearance is for higher rpm operation. And if the lifter bores need to be reamed for installation of bronze bushings, just like the valves, the lifters are offset at a 4 degree angle.
Note 2 - Champion spark plugs or equivalent.
Note 3 - Measure just below oil ring and at right angles to wrist pin.
Note 4 - Measure 1/2" above the bottom of the piston skirt.
Note 5 - Top and center compression rings.
Note 6- The lesser clearance is for up to 3,600 rpm operation, and the greater clearance is for higher rpm operation. Also, the maximum is for a fresh valve job. Because as the valves and seats wear into each other, the clearances will be lessened.


Kohler K-Series - Single Cylinder Torque Values and Sequences for Fasteners | Top of page
Model (Horsepower) K91 (4hp) K141 (6¼hp) &
K161 (7hp)
K181 (8hp) K241 (10hp), K301 (12hp), K321 (14hp) and K341 (16hp)
Connecting Rods (See notes 1 & 2) Posi-Lock (nut) - - New 140 in. lb./12 ft. lb.
Used 100 in. lb./9 ft. lb.
New 260 in. lb./22 ft. lb.

Used 200 in. lb./17 ft. lb.

Capscrew (bolt) 140 in. lb./12 ft. lb. 200 in. lb./17 ft. lb. 285 in. lb./24 ft. lb.
Spark Plugs 234 in. lb./18-22 ft. lb 234 in. lb./18-22 ft. lb. 234 in. lb./18-22 ft. lb
Cylinder Head (See note 1)
K90/91 (4hp)
200 in. lbs. / 17 ft. lbs.

K141 (6¼hp), K161 (7hp), K181/M8 (8hp)
230 in. lbs. / 15-20 ft. lbs.

K241 (10hp), K301 (12hp), K321 (14hp) and K341 (16hp)
285 in. lbs. / 25-30 ft. lbs.
Flywheel Retaining
(See note 5)
Nut (See note 1) 40-50 ft. lb. 85-90 ft. lb. note 4 5/8" stud - 65 ft. lb.
3/4" stud - 170 ft. lb.
Screw (3/8" bolt) (See note 1) 250 in. lb. - 22-27 ft. lb./35 ft. lb.
Governor Bushing 70-90 in. lb. 130-150 in. lb. 100-120 in. lb.
Grass Screen Metal - 70-140 in. lb. 70-140 in. lb.
Plastic - - 20-30 in. lb.
Oil Pan Cast Iron (See note 1) 250 in. lb. Grade 5-250 in. lb.
Grade 8-350 in. lb.
35 ft. lb.
Sheet Metal (See note 1) - - 200 in. lb.
Plastic Fuel Pump Mounting Screws - 37-45 in. lb. 37-45 in. lb.

Note 1 - Lubricate fastener threads with motor oil.
Note 2 - DO NOT overtorque - DO NOT loosen and retorque the hex nuts on Posi-Lock connecting rods.
Note 3 - Overtorque 20%, loosen below torque value and retorque to final torque value. NOTE: Overtorquing the rod bolts 20% places stress on the threads in a NEW aluminum rod. This allows for proper tightness so the bolts won't loosen later. Torque used rods to 285 in. lbs. and leave them at that.
Note 4 - Prior to Serial No. 23209832 - 45-55 ft. lb.
Note 5 - Flywheel and crankshaft tapers must be clean and dry.
NEW - Component directly from stock. USED - Component that was in a running engine.


Identification & Torque Settings of Most Commonly Used Grades of Bolts Top of Page
Use Standard Torque Settings When Specific Values Are Not Specified.
(C) = Coarse thread, (F) = Fine thread

Hardness è

No lines = Grade 3

No lines = Grade 3 bolt

3 lines = Grade 5

3 lines = Grade 5 bolt

6 lines = Grade 8

6 lines = Grade 8 bolt

Stainless Steel /
Special Alloy

Stainless Steel / Special Alloy bolts

Bolt Size

â

Material: Low Carbon Steel. Tensile Strength: 85,000 p.s.i. (Low Strength)

Material: Medium Carbon Steel, Tempered. Tensile Strength: 120,000 p.s.i. (Medium Strength)

Material: Medium Carbon Alloy Steel, Quenched and Tempered. Tensile Strength: 150,000 p.s.i. (High Strength)

18-8 [304] Stainless Steel

 1/4-20 (C)
 1/4-28 (F)
5/16-18 (C)
5/16-24 (F)
 3/8-16 (C)
 3/8-24 (F)
7/16-14 (C)
7/16-20 (F)
 1/2-13 (C)
 1/2-20 (F)
9/16-12 (C)
9/16-18 (F)
 5/8-11 (C)
 5/8-18 (F)
 3/4-10 (C)
 3/4-16 (F)
 70 in. lb. /  6 ft. lb.
 85 in. lb. /  7 ft. lb.
150 in. lb. / 13 ft. lb.
165 in. lb. / 14 ft. lb.
260 in. lb. / 22 ft. lb.
300 in. lb. / 25 ft. lb.
 35 ft. lb.
 45 ft. lb.
 50 ft. lb.
 70 ft. lb.
 75 ft. lb.
100 ft. lb.
110 ft. lb.
140 ft. lb.
150 ft. lb.
200 ft. lb.
115 in. lb. / 10 ft. lb.
140 in. lb. / 12 ft. lb.
250 in. lb. / 21 ft. lb.
270 in. lb. / 23 ft. lb.
 35 ft. lb.
 40 ft. lb.
 55 ft. lb.
 75 ft. lb.
 80 ft. lb.
105 ft. lb.
125 ft. lb.
165 ft. lb.
180 ft. lb.
230 ft. lb.
245 ft. lb.
325 ft. lb.
165 in. lb. / 14 ft. lb.
200 in. lb. / 17 ft. lb.
350 in. lb. / 29 ft. lb.
 30 ft. lb.
 50 ft. lb.
 60 ft. lb.
 80 ft. lb.
105 ft. lb.
115 ft. lb.
165 ft. lb.
175 ft. lb.
230 ft. lb.
260 ft. lb.
330 ft. lb.
350 ft. lb.
470 ft. lb.
 14 ft. lb.
 17 ft. lb.
 29 ft. lb.
 35 ft. lb.
 58 ft. lb.
 69 ft. lb.
 98 ft. lb.
110 ft. lb.
145 ft. lb.
160 ft. lb.
200 ft. lb.
220 ft. lb.
280 ft. lb.
310 ft. lb.
490 ft. lb.
530 ft. lb.


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