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ENGINE
3.4
ENGINE SERVICE DATA
Cylinder / Piston / Connecting Rod EH42PLE EH50PLE
Cylinder
Surface warpage limit (mating with cylinder head) .0020″ (.05 mm) .0020″ (.05 mm)
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Cylinder bore Std 3.4606-3.614″ (87.900-87.920 mm) 3.6221-3.6228″ (92.00-92.02 mm)
Taper limit .0020″ (.050 mm) .0020″ (.050 mm)
Out of round limit .0020″ (.050 mm) .0020″ (.050 mm)
Piston clearance
Std .0006-.0018″ (.015-.045 mm) .0006-.0018″ (.015-.045 mm)
Limit .0024″ (.060 mm) .0024″ (.060 mm)
Boring limit .020″ (.5 mm) .020″ (.5 mm)
Piston Outer diameter
Std 3.4596-3.4600″ (87.875-87.885 mm) 3.6204-3.6215″ (91.970-91.985 mm)
.0098″ (.25 mm) OS 3.4695-3.4699″ (88.125-88.135 mm) 3.6304-3.6310″ (92.21-92.23 mm)
.0197″ (.50 mm) OS 3.4793-3.4797″ (88.375-88.385 mm) 3.6403-3.6407″ (92.46-92.47 mm)
Standard inner diameter of piston pin bore .9055-.9057″ (23.0-23.006 mm) .9055-.9057″ (23.0-23.006 mm)
Piston Pin
Outer diameter .9053-.9055″ (22.994-23.0 mm) .9053-.9055″ (22.994-23.0 mm)
Standard clearance-piston pin to pin bore .0002-.0003″ (.004-.008 mm) .0002-.0003″ (.004-.008 mm)
Degree of fit Piston pin must be a push (by hand) fit at 68° F(20° C)
Piston Ring Piston ring installed gap Top ri ng
Std .0079-.0138″ (.20-.36 mm) .0079-.0138″ (.20-.36 mm)
g
g
g
p
p
g
Limit .039″ (1.0 mm) .039″ (1.0 mm)
Second
i
Std .0079-.0138″ (.20-.36 mm) .0079-.0138″ (.20-.36 mm)
ring
Limit .039″ (1.0 mm) .039″ (1.0 mm)
Oil ring
Std .0079-.0276″ (.20-.70 mm) .0079-.0276″ (.20-.70 mm)
g
Limit .059″ (1.5 mm) .059″ (1.5 mm)
Piston Ring Standard clearance -
i
i
i
Top r in g
Std .0016-.0031″ (.040-.080 mm) .0016-.0031″ (.040-.080 mm)
g
piston ring to ring groove
p
g
Limit .0059″ (.15 mm) .0059″ (.15 mm)
Second
i
Std .0012-.0028″ (.030-.070 mm) .0012-.0028″ (.030-.070 mm)
ring
Limit .0059″ (.15 mm) .0059″ (.15 mm)
Connecting
R
d
Connecting rod small end ID .9058-.9063″ (23.007-23.020 mm) .9058-.9063″ (23.007-23.020 mm)
g
Rod
Connecting rod small end radial clear-
Std .0003-.0010″ (.007-.026 mm) .0003-.0010″ (.007-.026 mm)
g
ance
Limit .0020″ (.05 mm) .0020″ (.05 mm)
Connecting rod big end side clearance
Std .0039-.0256″ (.1-.65 mm) .0039-.0256″ (.1-.65 mm)
g
g
Limit .0315″ (.80 mm) .0315″ (.80 mm)
Connecting rod big end radial clear-
Std .0004-.0015″ (.011-.038 mm) .0004-.0015″ (.011-.038 mm)
g
g
ance
Limit .0020″ (.05 mm) .0020″ (.05 mm)
Crankshaft Crankshaft runout limit .0024″ (.06 mm) .0024″ (.06 mm)
KEY - Std: Standard;OS: Oversize; ID: Inner Diameter;
OD: Outer Diameter; Mag: Magneto Side; PTO: Power
Take Off Side