Mazda 1975 Rotary Pickup Workshop Manual page 62

e t i n g
rdrng
0 kg/
adrng
lL'out
linz l,
a n d
a-2.
u n q e r
p r i n g
) n P n t
l n i t .
lf the
d the
- 1 7
r l n
r and
le oil
2
\pply oil onto the rubber gasket on the new filter
: ' d g e .
i'.rce the cartridge on the cover and screw it on
. it just touches the cover.
. r tighten the cartridge fully by hand.
i:art the engine and check to see that the oil is
ieaking from the joints.
\iter stopping the engine, ensure that the oil level
^r'tweorr the "F" and ('L)) marks
of the dipstick
:e. Top up with oil if necessary.
: _ I . M E T E R I N G O I L P U M P
: oil enters the metering oil pump from the lubri-
'::.lg oil passage in
the front cover and the oil
.,'h is measured and discharged from the metering
.ump enters the carburetor through a hose. The
entering the carburetor is discharged from a por-
:. of venturi to the working chamber to lubricate
-' sas seals. The plunger type metering oil pump is
.''ided to send the proper amount of oil to the
-::uretor and is driven by the distributor drive gear.
: - l- 1 .
C h e c k i n g M et er in g O i l P um p
''. - sufficient consideration
is being given on the per-
::nance and durability of the metering oil pump
its production process, generally there is no need
' adjustment.
' .: as previously mentioned, the metering oil pump
ihe heart of the operation of the gas seals and
,"rificient amount of "oil discharge could cause trou-
'-'S such as drop in engine power and development
' noise, because of
insufficient lubrication, while
. ,.--essive amount of oil discharge could cause problems
.: rvhite smoke.
:.erefore, the amount of oil discharge should always
-: within the proper range.
r case the engine tends to show any of the above
' ,ubles, the amount of oil
discharge should be checked,
':.',ceeding as follows.
Dsconnect the connecting rod by removing the
:t e r p i n.
- Dsconnect the 2 metering oil hoses from the
.: :b u r e to r .
: Install the tachodwell tester and set
the engine at
;onstant speed of 2,000 rpm. Wait until the oil
- scharge from the end of the metering oil hoses
''','--omes steady ffid,
when it is steady receive the
.. in the measuring cylinder and start measuring the
::ie simultaneouslv.
: Stop the engin-e after 6 minutes and check the
::iount of oil discharge. If it is within the proper
:rge shown below, the discharge is satisfactory.
:herwise, adjust the oil metering pump.
2.0 - 2.5 ccl6 mtn.
(0.122 - 0.153 cu. in/6 min.)
at 2,000 rpm
Note :
As lubricating oil is not being supplied to the gas
seals while the measurements arc being taken, a
proper amount of clean engine oil should be added
into the carburetor or the engine should be run on
mixed gasoline into which oil has been mixed at the
r at i o of 1 00 : l .
M e a s u r i n g c y l i n d e r
Ftg. 2-19
Checking oil discharge
2*l-2. Adjusting Metering Oil Pump
If the amount of oil discharge measured by the
procedure shown in the previous paragraph is not
proper it would be adjusted by the adjusting screw.
The amount of oil discharge increases when the adjust-
ing screw is tightened, and decreases when loosened.
As the amount of oil discharge changes by O.2 - 0.3
cc/6 min./2,000 rpm per rotation of the screw, adjust
the screw after calculating the number of rotations
necessary to obtain the proper adjustment.
Also check to ensure that the lock nut of the adjust-
ing screw will lock without fail and be sure not to
bend the lever when adjusting. After adjustment has
been completed, measure the amount of oil discharge
again and make sure that it is within the proper
range.
In case the metering oil pump cannot be adjusted,
check the oil leakage from pump body or tubes.
If the oil leakage cannot be found, replace a pump
assemblv.
Fig. 2-2O Adjusting screw of metering oil pump