Cylinders; Resizing; Checking Cylinder Bore; To Set Up For Honing - Columbia ParCar P4G Service Manual

Table 22 - Crankcase Cover or Sump Torque
Model Series
9 & 13 H.P. Engines
Table 23 - Crankshaft End Play
9 & 13 H.P. Engines
CYLINDERS AND BEARINGS

Cylinders

Columbia ParCar/Briggs & Stratton OHV engines use ball
bearings to support the crankshaft.
Inspection, All Models
Always, inspect cylinder after engine has been disassem-
bled. Visual inspection will show if there are any cracks,
stripped bolt holes, broken fins or if cylinder wall is damaged.
Use a Telescoping Gauge and CPC# 96070-96, Dial
Caliper, or inside micrometer to determine size of cylinder
bore.
Measure at right angles, Figure 129.
Table 1 lists standard cylinder bore sizes.
If the cylinder bore is more than .003" (.08 mm) oversize,
or .0015" (.04 mm) out of round, it must be resized.
Center Of Piston Ring
Travel
Figure 129 - Checking Cylinder Bore
Note: If cylinder bore is within specification and shows no
sign of scoring or other damage, new piston rings may be
installed providing cylinder bore is reconditioned using a
rigid hone with finishing stones, to restore the proper cross
hatch angle in the cylinder bore.
In.Lb.
175
(19.7)
175
(19.7)
Top
Center
Bottom
Measure At
Six Points
Proper cylinder cross hatch ensures proper lubrication
and piston ring rotation. See Cylinder Finish, page 7-52.
Table 24 - Standard Bore Diameter
Model
Series
9 H.P.
13 H.P.

Resizing

ALWAYS RESIZE TO EXACTLY .010" OR .020", (.25 MM,
OR.50 MM) OVER STANDARD SIZE AS SHOWN IN
TABLE 24. IF THIS IS DONE ACCURATELY, THE
STOCK OVERSIZE RINGS AND PISTONS WILL FIT
PERFECTLY AND PROPER CLEARANCES WILL BE
MAINTAINED.
Cylinders can be quickly resized with a good hone such as
Briggs & Stratton Tool #19205 with 19303 and 19304
stones or Tool #19211, Hone Sets. Contact your Briggs &
Stratton source of supply. Use stones and lubrication rec-
ommended by hone manufacturers to produce correct
cylinder wall finish.
Note: An acceptable honing oil can be made by mixing 4
parts No. 30 weight oil with 1 part kerosene or use auto-
matic transmission fluid.
Note: If a boring bar is used, a hone must be used after
boring operation to produce proper cylinder wall finish.
Honing can be done with a portable variable speed 1/2"
electric drill or carpenter's brace, but it is easier to use a
drill press, Figure 130.

To Set Up For Honing

Fasten cylinder to a heavy iron bracket or use honing fix-
ture. Some cylinders require shims. Use a level to align
drill press spindle with cylinder bore.
Check cylinder bores at top and bottom for burrs. Remove
burrs to prevent damage to hone.
Note: Remove ball bearing from cylinder before honing. If
honing grit enters ball bearing, rapid wear of the bearing
will result. Honing grit is virtually impossible to remove
from a ball bearing. See procedure by model number, this
section, for removing and installing ball bearing.
Note: Cylinders bores are 30° from the horizontal plane.
Honing fixture must hold base of cylinder at 60° from hori-
zontal plane for cylinder bore to be vertical.
Oil surface of drill press table liberally. Set plate and cylin-
der on drill press table. (Do not anchor to drill press table).
7-50
Max.
Min.
Inches Inches
3.1504"
3.1496"
(80.02 mm)
(80.00 mm)
3.5047"
3.5039"
(89.02 mm)
(89.00 mm)