Buick LeSabre 1965 Service Manual page 46

2 - 2 4 TROUBLE DIAGNOSIS
ENGINE
b. Tune-Care Specifications
1.
2.
3 .
4.
5.
6.
7.
8.
9.
10.
11.
Check Points
Secondary Resistance
Ignition Output
Cranking Voltage
Charging Voltage *
(Quick Check)
Spark Plug Gap
Dwell Angle
Engine Vacuum
Engine Idle Speed
Initial Timing *
Total Distributor Advance
(@ 2500 Engine RPM)
Centrifugal Advance Only
( @ 2500 Engine RPM)
Allen Uni-Tuner
27 Min. @ 1500 RPM
26 Min. @ 1500 RPM
300 Cu. In. 550 RPM,
425 Cu. In.
Engine Dual
Four Barrel
Auto Trans.
12 BTC
23° -32°
10° -14°
9 Volts Min.
14-15 Volts @ 1500 RPM
.035 Inches
30 Degrees
14 Inches Min. @ Idle
All Others 500 RPM (Add 50
401 & 425 Cu. Ir
Engine
2 1/2°
34° -42°
20° -24°
Sun Tune-Up Tester
3 ± .5 Volts @ 1500 RPM
Blue Band @ 1500 RPM
RPM if Air Cond.)
i. 300 Cu. In.
Engine
2 1/2°
31°-39°
18° -22°
* Adjust engine idle as specified, then disconnect vacuum hose.
c.
Compression Pressure Limit Chart
This chart may be used when checking cylinder compression pressures. It has
been calculated so that lowest reading number is 75% of the highest reading
number.
Example: After checking the compression pressures in all cylinders, it was
found that the highest pressure obtained was 182 psi. The lowest
pressure reading was 145 psi. By locating 182 in the maximum
column, it is seen that the minimum allowable pressure is 136 psi.
Since the lowest reading obtained was 145 psi, the car is within
limits and the compression is considered satisfactory.
Maximum
Pressure
pounds/
sq. inch
134
136
138
140
142
144
146
148
150
152
154
156
158
160
162
164
166
168
170
172
174
176
178
180
182
184
Minimum
Pressure
pounds/
sq. inch
101
102
104
105
107
108
110
111
113
114
115
117
118
120
121
123
124
126
127
129
131
132
133
135
136
138
Maximum
Pressure
pounds/
sq. inch
186
188
190
192
194
196
198
200
202
204
206
208
210
212
214
216
218
220
222
224
226
228
230
232
234
236
238
Minimum
Pressure
pounds/
sq. inch
140
141
142
144
145
147
148
150
151
153
154
156
157
158
160
162
163
165
166
168
169
171
172
174
175
177
178
2 - 9 HARD STARTING
IMPROPER PER-
FORMANCE, EXCESS-
IVE FUEL OR OIL
CONSUMPTION
a. Hard Starting, Improper
Performance, Excessive
Fuel Consumption
These subjects are covered in
Section 3-B. See paragraph 3-4
for hard starting, paragraph 3-5
for improper engine performance,
and paragraph 3-6 for excessive
fuel consumption.
b. Excessive Oil Consumption
If an engine is reported to be
using an excessive amount of oil,
a thorough inspection should be
made for external leaks and the
conditions of operation should be
carefully considered before as-
suming that the engine is using
too much oil as a result of an
internal condition.
Place clean paper on the floor
under engine and run the engine at
medium speed until the oil is
thoroughly warmed up, then stop
the engine and check for oil leaks