3-74. OIL PUMP INSTALLATION (Contd)
Perform steps 7 through 9 for M915/Big Cam I only.
New gasket (10) (M915/
Install on oil pump assembly (11).
Big Cam I)
Oil pump assembly (11)
Position in mounting hole of
Ensure pump drive gear (7) of
(M915/Big Cam I)
cylinder block (1).
oil pump assembly (11) aligns
with teeth on camshaft gear (9).
Three screws (12), two
Install on oil pump assembly
Tighten to 40 lb-ft (54 Nm).
screws (14), and five new
(11) and cylinder block (1).
lockwashers (13) (M915/
(Big Cam I)
The oil pump gear backlash check procedure is identical for both M915/Big Cam I and
M915A1/Big Cam III engines.
10. Pump drive gear (7) (M915/
Check for backlash against
Big Cam I and M915A1/
camshaft gear (9) as follows:
Big Cam III)
(1) Install dial indicator and
Use dial gauge attachment (15)
sleeve assembly (16) and dial
(ST-1325) and dial indicator and
gauge attachment (15) on front of
sleeve assembly (16) (3376050).
cylinder block (1), and position tip
of indicator (16) against a tooth of
pump drive gear (7).
(2) Rotate pump drive gear (7) as
Ensure camshaft gear (9) does
as far as it will freely move.
(3) Turn dial of indicator to zero.
(4) Rotate pump drive gear (7) in
Minimum backlash is 0.002 in.
opposite direction. The reading
(0.051 mm) and maximum
on indicator (16) shows amount of
backlash is 0.016 in. (0.406 mm).
backlash between gears.
Replace pump drive gear (7) if not
within specifications. Refer to
para. 3-44 for pump drive gear (7)
removal and installation.
Install front gear cover (para. 3-75).