A A 093

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We reserve the right to make changes in design or add improvements without incur-
ring the obligation to make such changes in equipment previously manufactured.
H6030

PARTS-SERVICE

GRAM

Subject: GM 4.3 Liter V-6 Cylinder Head Changes

PREFACE

The 1992 GM 4.3 liter series (2KM) introduced a change to the valve train by incorporating non-adjustable
valve lash. This change required a new metric rocker arm stud P/N 1358677 plus a new rocker ball P/N
1358044 and a M8 x 1.0 MM nut P/N 1358043. See Figure (1).

The valve lifter, push rod and rocker arm did not change. This arrangement is current thru 1994 (4LM)
engines.

CYLINDER HEADS

If a GM 4.3 liter cylinder head is purchased thru the Hyster Parts Depot all previous and current part numbers
are superceded by P/N 1367479 cylinder head kit. This kit contains (6) P/N 1376893 M10 x 1.0 MM self
locking nuts and (6) P/N 1358044 rocker arm balls. The rocker arm stud P/N 1360868 is threaded into the
cylinder head and requires valve lash to be adjusted.

This arrangement will work with all engines through 1993; but valve lash must be adjusted. See Figure (2).

SERVICE NOTE

If the non-adjustable valve lash arrangement is desired, P/N 1367479 cylinder head kit can be altered.
Remove (6) P/N 1360868 rocker arm studs in each cylinder head. Install (6) P/N 1358677 rocker arm studs
and (6) P/N 1367478 rocker kits on each cylinder head.

Rocker kit P/N 1367478 contains (1) P/N 1307964 rocker arm, (1) P/N 1358044 rocker arm ball and (1)
P/N 1358043 nut.

AA00093

May 20, 1994

H70-155XL
S70-155XL

Engine

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AA00093
Page 2

ROCKER KIT

1367478

TORQUE NUT P/N 1358043
TO 20 FT. LBS.
TORQUE STUD P/N 1358677
TO 35 FT. LBS.

NUT

1358043

BALL

1358044

ROCKER ARM

1307964

THREAD

M8 x 1.0 MM

SHANK

10 MM

HEX

15 MM

THREAD

M10 x 1.5 MM x 22

(FIGURE 1)

P/N 1358677

NUT

1376893

BALL

1358044

ROCKER ARM

1307964

TORQUE STUD P/N 1360868
TO 35 FT. LBS.

(FIGURE 2)

P/N 1360868

THREAD

M10 x 1.0 MM

SHANK

10 MM

HEX

18 MM

THREAD

M10 x 1.5 MM x 17


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