Craftsman 143.991200 Specifications download pdf (Page 80)

ULTRA-BALANCE

TIMING

CAM TIMING

CHAMPFER UP

TOWARD CAM

CAMSHAFT

COMPRESSION

RELEASE SPRING

THRUST

WASHER

SCREW

"O" RING

OIL PUMP COVER

OIL PUMP ASSY.

SCREW

OIL PASSAGE GASKET

OIL PUMP

SHAFT

OIL FILTER

5. Assemble the compression release

components to the camshaft on engine

models OHH and OHSK50-70. Install spring

end "A" through the release from the pin side,

insert spring end "B" through the camshaft

gear, and slide the release pin in the small

hole near the center of the cam gear.

Assemble the thrust washer on the camshaft

next to the compression release. (diag. 55)

NOTE: Some OHH models used on chipper/

shredders may not require compression

release mechanisms.

6. Some OHV11 - 17 engines come equipped

with a spin on oil filtration system. If the engine

is not equipped with a filter, one may be added

IF THE SUMP HAS AN OIL PASSAGE

COVER. The kit part number 36435A should

be ordered to upgrade the engine if desired.

7. Install the lifters, camshaft, barrel and plunger

style oil pump (chamfered side toward the

gear) if applicable, ultra-balance shaft or dual

balance shafts if applicable. Align the timing

mark or notched tooth on the crankshaft gear

to the mark or hole in the camshaft gear. If

equipped, time the Ultra-balance

with the

piston at Top Dead Center (T.D.C.). Slide the

drive gear over the keyway in crankshaft while

aligning the timing marks on the gears.

a. Dual Balance Shaft

Time the dual shaft counterbalance system

with the piston at T.D.C. Install the

counterbalance with the thicker gear in the

far right boss in the crankcase and the other

counterbalance shaft with the thinner gear in

the far left boss while aligning the timing

marks. Slide the drive gear over the keyway

in the crankshaft while aligning the timing

mark with the thicker counterbalance gear.

NOTE: Engines equipped with rotary oil

pumps must have the drive shaft and

pump assembled after the sump cover is

installed.

OIL

PASSAGE

COVER

GASKET

DRIVE GEAR,

CRANKSHAFT

DUAL SHAFT

COUNTERBALANCE

MATCH MARK

THICKER

GEAR

THINNER

GEAR

INSERT

SPRING

END "A"

COMPRESSION

RELEASE

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Craftsman 143.991200 Specifications Page 80

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