Onan MEP-003A - Page 21

TM5-6115-585-34
NAVFAC P - 8-262-12
TO - 35C2-3-455-2
TM - 05684C - 34
Table 1-2 . Repair and Replacement Standards ( Cont )
Manufacturer Dimensions
and Tolerances
Component
Maximum Allowable
Wear Limit
Minimum
Maximum
PISTON
RING
(
Cont
):
Clearance
in
groove
oil control
0.0020 0.0030
0.0050
Gap
0.0100 0.0200 0.0400
VALVE
,
INTAKE
:
Head diameter
1.
307
1.317
N
/
A
Stem
diameter
-
tapered
0.3391
/ 0.3381
0.3420 / 0.3410
0.002
Stem
to guide
clearance
0.0030 / 0.0050
0.0012 / 0.0032
0.0100
Stem to rocker arm clearance Cold
0.010
0.010
adjustable
Seat diameter in head
1. 361
1.
362
N
/
A
Seat
width
in
head
1/16
3/32
1/8
0. 433
0.439
0.500
Top
of
valve
recessed
below
cylinder
head
deck
Valve
seat
angle
Valve
Face
Angle
VALVE
,
EXHAUST
:
45 °
44 °
N
/
A
N
/
A
45
°
44
°
Head
diameter
1. 307 1.317
N
/
A
Stem diameter
0. 3405
0.3415 0.002
Stem to guide clearance
0.0030 0.0050
0.0100
Stem to rocker arm clearance
Cold 0.007
0.007
adjustable
Seat diameter in head
1. 361 1.
362
N / A
Seat width in head
3/64
1/16 1/8
0.433
0.439
0.500
Top
of
valve
recessed
below
cylinder
head
deck
45
°
Valve
seat
angle
Valve
Face
Angle
VALVE
GUIDE
:
45
°
45
°
N
/
A
N
/
A
45 °
Length
Exhaust
Intake
2
1-25
/
32
Outside diameter
0.
4690
0.4695
0.4695
Bore diameter - intake
ream
0. 3425
0.
3435
0.003
Bore diameter - exhaust
ream
0.3445
0.
3455
0.003
Height
above
cylinder
head
deck
Intake
Exhaust
11/32
5/8
N
/
A
N
/
A
-
-
-
1-6