Wisconsin VH4D Spezifikationen PDF herunterladen (Seite 26)

PLACE OPEN END OF

RING ON PISTON

FIRST AS SHOWN

Fig. 30

CHROME FACED

COMPRESSION RING

SCRAPER RING

OIL RING WITH

EXPANDER

F ig. 31

over piston and into correct groove, being careful not

to distort ring. Install bottom ring first and work to-

ward the head of the piston, installing top ring last.

The word ’TOP’ on compression and scraper rings

indicates direction of ring placement on piston.

Beginning with serial #5538322, three ring pistons

(chrome faced compression ring, scraper ring, oil ring

and expander), with improved oil control characteris-

tics, replaces four ring pistons furnished with two

compression rings.

CAUTION: When replacing four ring pistons with

three ring pistons, a complete set of four pistons

must be used. Do not mix three and four ring pistons

in the same engine.

The outer diameter of the compression ring is chrome

plated. Mount scraper ring with scraper edge down,

otherwise oil pumping and excessive oil consumption

will result. Refer to Fig. 31 for the correct placement

of piston rings.

CYLINDER BLOCKS

Clean all dirt and foreign deposits from between the

cylinder fins and manifold ports.

The cylinder blocks do not have to be removed unless

the cylinder bore is scored, out-of-round, or worn over-

size more than 0.005 inch. In this event, the block

will have to be removed, rebated and fitted with over-

size pistons and rings. This work should be done by

an authorized Wisconsin Service Center.

In Reassembly; tighten the cylinder block mounting

nuts, 40 to 50 foot pounds torque.

PISTON TO CYLINDER

AT PISTON SKIRT THRUST FACE

.003 to .004"

PISTON RING GAP .010 to .020"

TOP RING .002 to .004"

PISTON RING

SIDE CLEARANCE

IN GROOVES

SCRAPER RING

OIL RING

PISTON PIN TO

CONNECTING ROD BUSHING

PISTON PIN TO PISTON

.002

to .004"

.001 to .003"

.0004 to .0012

.0000 to .0008"

tight

CONNECTING ROD TO

.009 to .016"

CRANK PIN- SIDE CLEARANCE

CONNECTING ROD SHELL BEARING

.0012 to .0033"

TO CRANK PIN DIA. (VERTICAL)

CONNECTING ROD BABBITT

.0007 to .0020"

BEARING TO CRANK PIN

~’~

STANDARD

~ ~’/ CRANK PIN DIMENSIONS

11"I;56 DIA. GRIND

Fig. 32, PISTON, RING AND ROD CLEARANCES CHART

VALVES and SEAT INSERTS (Fig. 33)

Remove valve tappet inspection plate and compress

valve springs with a standard automotive type valve

lifter as illustrated. Insert a rag in the opening at the

bottom of valve chamber so the retaining locks do not

fall into engine crankcase. Remove retaining locks,

seats, springs, valves and clean these, as well as the

ports and guides, of all carbon and gum deposits. Tag

each valve so that in reassembly they willbe mounted

in the same guide they were removed from. Replace

valves that are burned or pitted.

The inlet and exhaust valve seat inserts can be re-

moved, when replacement becomes necessary, by

means of Wisconsin Motor DF-66-A insert puller.

Before grinding valves, inspect valve guides for pos-

sible replacement. Refer to Falve Guide paragraph.

The valve face is ground at 45°to the vertical center

line of the valve stem and the valve seat insert should

also be ground at a 45

angle. After grinding, lap

valves in place until a uniform ring will show entirely

around the face of the valve. Clean valves and wash

block thoroughly with a hot solution of soap and

water. Wipe cylinder walls with clean lint free rags

and light engine oil, especially if cylinders were

rebated and honed.

Valve guides in the cylinder block are easily re-

placeable by use of Wisconsin DF-72 driver tool.

In reassembly; mount guides with inside chamfer

down. The valve stem has a clearance of .003

to .0054 in the guide. When the clearance becomes

1 2 ... 21 22 23 24 25 26 27 28 29 30 31 ... 47 48

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