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SECTION 11
REASSEMBLY
CLOSURE PLATE ALIGNMENT
Engines with Serial No. 1830500016
and higher have
two alignment pins pressed into the crankcase (see
Figure 11-26) to provide proper alignment of the clo-
sure plate.
On direct connected applications having splined
crankshafts, the correct alignment is essential to pre-
vent rapid spline wear due to excessive run-out.
When rebuilding splined crankshaft engines that were
built before the permanent alignment pins were add-
ed, use the available alignment pin tools when install-
ing new or serviced closure plates. Hobart Welders
use Part No. 52 455 05 pins while all other splined
shaft specifications use 52 380 06 pins. The closure
plate kits which are available for these earlier engines
include the pins and instructions for using.
Follow preceding instructions for reinstalling the clo-
sure plate, however, before tightening the plate and
before installing the oil seal, insert the four alignment
pins into four equal distant locations between the
crankshaft seal surface and the closure plate outer
circumference.
If any pins become tight, shift the clo-
sure plate to allow all pins to position equally against
crankshaft sealing surface. After aligning tighten clo-
sure plate screws as specified in Step 4. Remove the
pins after tightening the closure plate to allow install-
ing the oil seal.
INSTALL PISTON RINGS
NOTE:
For detailed piston inspection procedures and
piston ring installation procedures, refer to the
"Inspection and Reconditioning" Section.
INSTALL PISTONS IN
CYLINDER BARRELS
NOTE:
Proper orientation of the pistons within cylin-
der barrels is extremely important.
Improper
orientation may Cause extensive wear or
damage.
1. Stagger the piston rings in grooves until the end
gaps are 120° apart.
2. Lubricate the pistons and rings with engine oil.
Install piston ring compressor around pistons.
Refer to Figure 11-28.
Piston Ring Compressor
Installed Around Piston
Cylinder
Barrel
Figure 11-28.
Installing Pistons.
3. Orient the "Fly" mark on pistons so it points to-
wards flywheel (intake port) side of cylinder bar-
rels. Refer to Figure 11-29.
Top of
Piston
Arrow Must Point
Towards Flywheel
Figure 11-29. Piston Installation Direction Identifier.
Gently push the pistons into cylinder bores from
cylinder head side—do not pound on piston. Re-
ferto Figure 11-28.
Make sure that used pistons are reinstalled into
the proper cylinder barrels as marked during
disassembly.
4. Continue pushing the piston into bore until the pis-
1on pin bore is completely exposed on the crank-
case side of cylinder barrel. Make sure the oil
control ring is not exposed.
INSTALL CYLINDER BARRELS
1. Make sure the mating surfaces of crankcase and
cylinder barrels are cleaned and prepared as di-
tected by the sealant manufacturer.
Refer to
"INSTALL CAMSHAFT BORE PLUG AND SEAL
CRANKCASE."
2. Apply a 1/16" bead of sealant to the crankcase as
shown in Figure 11-30. Follow the sealant man-
ufacturer's recommendations regarding setting.
11.10
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