1973 DATSUN B110 Service Repair Manual

Page 321 of 513

DATSUN B110 1973  Service Repair Manual 
ENGINE

How 
to 
read

Figure 
ET 
22

Determining 
operating

pressure 
and

adjustment 
of 
vacuum 
control 
valve

1 
When

atmospheric 
pressure 
is 
known

operating

pressure 
is 
found

by 
fo

Page 322 of 513

DATSUN B110 1973  Service Repair Manual 
EMISSION

CONTROL 
AND

TUNE 
UP

accelerator

pedal 
is

released

During 
the

testing 
measure 
the 
throttle

opener

operating 
pressure 
to 
see 
whether 
it 
is 
in 
the

predetermined 
value

Page 323 of 513

DATSUN B110 1973  Service Repair Manual 
ENGINE

Gear 
Vacuum 
advance 
Note

R 
No

1st 
No

2nd 
No

3rd 
No

4th 
Yes 
Immediately 
after

starting 
the

engine 
in 
cold

weather 
vacuum 
advance 
is 
available

for 
all

gear

position

Page 324 of 513

DATSUN B110 1973  Service Repair Manual 
EMISSION 
CONTROL 
AND 
TUNE 
UP

The 
thermo 
switch 
is 
screwed 
on 
the

dash 
side

panel

RH 
The 
bi 
metallocated 
in 
the

thermo 
switch

prevents

the 
flow 
of 
electric

current 
when 
t

Page 325 of 513

DATSUN B110 1973  Service Repair Manual 
ENGINE

Caution

lock 
the 
front

and 
rear 
wheels

by 
fully

pulling 
the

parking 
brake 
lever 
before 
con

ducting 
this 
test

Fig 
ET 
32

Checking 
for 
operation 
of 
vacuum

advance

sys

Page 326 of 513

DATSUN B110 1973  Service Repair Manual 
EMISSION 
CONTROL 
AND

TUNE 
UP

Appearance

1 
First

inspect 
whether 
vacuum 
hoses

are 
connected

to 
correct

positions

2

Inspect 
hoses

for 
cracks 
distortion 
or

plugging

Checking 
of

Page 327 of 513

DATSUN B110 1973  Service Repair Manual 
ENGINE

6 
Start 
the

engine 
and 
continue

idling 
as 
described

under

paragraphs 
I 
2 
and 
3 
above

When 
several

minutes 
have

passed 
and

the 
valve 
is

partially 
opened

read 
the

t

Page 328 of 513

DATSUN B110 1973  Service Repair Manual 
EMISSION 
CONTROL 
AND

TUNE 
UP

CD

@

Fresh 
air

Blow

by

gas

Air 
used 
in

filtering 
oil 
1 
PCV 
valve

2 
Flame 
arrester

3 
Oil 
filler

cap

4

Baffle

plate 
and

steel 
net

E 
C002