SHOP MANUAL
Paragraphs 48-49
pistons are at top dead center. With
balancer counterweights in a straight
!own position, install balancer assembly
ith original shims (if used) on engine
block. Tighten retaining cap screws to
70-79 N-m (51-59 ft.-lbs.) torque. Install
lower cover and oil pan.
OIL PUMP AND
RELIEF VALVE
Models 1100-1110-1200-1300
48,
The rotor type oil pump is located
in a bore in the front of the cylinder
block. The pump is driven by the cam-
shaft gear.
To remove the oil pump, first remove
the timing gear case as outlined in para-
graph 33, Remove oil pump drive gear
and oil pump mounting cap screws.
Withdraw pump and oil pickup tube as
an assembly.
Unbolt and remove pump front cover
(4-Fig, 101), Withdraw inner and outer
rotor (5 and 6), Check all parts for wear
or damage. Use a feeler gage to check
rotor clearances as shown in Figs, 102,
103 and 104. Refer to the following
specifications and renew pump if neces-
sary.
Rotor to Cover End Clearance
Standard 0,03-0.11 mm
(0.001-0.004 in.)
Wear Limit 0.20 mm
(0.008 in.)
Outer Rotor to Body Clearance
Standard 0,14-0.22 mm
(0.006-0.009 in.)
Wear Limit 0,30 mm
(0,012 in.)
Rotor to Rotor Clearance
Standard 0.01-0,15 mm
(0.0004-0.006 in.)
Wear Limit 0,25 mm
(0.010 in.)
Engine oil pressure relief valve (2) is
serviced as an assembly and is not ad-
justable. Relief valve opening pressure
should be 241-393 kPa (35-57 psi) at
2600 engine rpm with oil temperature at
80° C (175° F), Minimum oil pressure at
idle speed is 117 kPa (17 psi).
Models 1210-1310
49,
The rotor type oil pump is located
inside the engine idler gear (11-Fig,
105).
The idler gear is pinned to the
pump outer rotor (8) and is driven by the
crankshaft gear.
To remove oil pump, first remove tim-
ing gear case as outlined in paragraph
34,
Remove "E" ring (1), then slide idler
gear with pump components as an
assembly off the pump shaft (4),
Fig. 101-Exploded view of
engine oil pump used on
Model 1110. Oil pump used
on 1100, 1200 and 1300
models Is simitar except
that Inner rotor Is pinned to
pump shaft
(5).
1.
Oil transfer tube
2.
Oil jiressure relief valve
3.
Drive gear
4.
End cover
5.
Inner rotor & shaft assy.
6. Outer rotor
7.
"0" ring
8. Pump housing
9. Spring pin
10.
"0" ring
11.
Pickup tube
Fig.
102 —
Use a straightedge and feeler gage to
check rotor to cover end clearance. Refer to text.
The pump shaft and oil port block
assembly (Fig. 106) is a press fit in bore
of cylinder block. If renewal is required,
special tool No. 11097 and a slide ham-
mer may be used to pull port block from
cylinder block. Special installing tool No.
11063 is available for proper installation
of port block. The port block is in correct
installed position when installing tool
bottoms against engine block.
Inspect pump cover (6-Fig. 105),
rotors (7 and 8) and port head for wear,
scratches or scoring and renew if
necessary. Use a feeler gage to check
rotor to rotor clearance as shown in Fig.
104.
Standard clearance is 0.01-0.15 mm
(0,0004-0.006 in.) Renew rotors if
clearance exceeds 0,25 mm (0,010 inch).
Engine oil pressure relief valve is
located in right-hand side of cylinder
block below the fuel injection pump. The
relief valve is serviced as an assembly
and is not adjustable. Relief valve open-
Flg.
103 —Measure
outer rotor to housing
clearance using a feeler gage as shown. Refer to
text
Fig.
104 —Check
ciearance between inner rotor
and outer rotor vanes using a feeler gage. Refer
to text
ing pressure should be 297-490 kPa
(43-71 psi) at 2600 engine rpm with oil
temperature at 80° C (175° F), Mini-
mum oil pressure at idle speed is 48 kPa
(7 psi).
43
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