Pontiac Fiero 1988 Service Manual page 324

2.5L ENGINE 6A1-23
ENGINE SPECIFICATIONS (METRIC)
G E N E R A L DATA
TYPE
2.5L L-4
COMPRESSION P R E S S U R E
DISPLACEMENT 151 CU. IN. COMPRESSION RATIO 8.3:1
BORE AND STROKE
4.00"x3.00" FIRING O R D E R
1, 3,
4,
2
CYLINDER NUMBERS
4
VALVE S Y S T E M
VALVE INTAKE EXHAUST VALVE LIFTER
FACE ANGLE
45° 45° T Y P E HYDRAULIC
HEAD DIAMETER
43.688 38.1 LEAK DOWN RATE
12 TO 90 S E C . WITH 50 LB
STEM DIAMETER 7.95-7.98 / 7.92-7.95 LIFTER BODY DIAMETER 21.3868-21.4046 MM
STEM-TO-GUIDE CLEARANCE
LIFTER B O R E DIAMETER
21.425-21.450 MM
CLEARANCE IN BORE .635 MM
SEAT ANGLE 46°
46°
PLUNGER TRAVEL 3.175 MM
SEAT WIDTH
.889-1.905/1.473-2.667 VALVE TRAIN
SEAT RUN-OUT
—
—
PUSH ROD LENGTH 210.79 MM
SPRING ROCKER ARM RATIO 1.75:1
F R E E LENGTH 45.2
VALVE LASH 0
INSTALLED HEIGHT 36.58-36.58 CAMSHAFT
LOAD - C L O S E D 32-35 @ 36.58
LOBE LIFT - INTAKE
10.3124 MM
- O P E N 72-77 @ 26.42
- EXHAUST
10.3124
DAMPER JOURNAL - DIAMETER 47.4726 M M
F R E E LENGTH — - CLEARNACE .01778-.0685 MM
APPROX. NO. OF COILS
_
CAMSHAFT END PLAY .0381-.127
OIL PUMP
GEAR POCKET - DEPTH 13.1 MAX.
13.05 MIN.
GEAR THICKNESS
12.998 MM
12.973 MM
CRANKSHAFT
MAIN JOURNAL
CRANKPIN
DIAMETER 58.42 DIAMETER 50.8
TAPER .013
TAPER .013
OUT-OF-ROUND-MAX
.013 OUT-OF-ROUND-MAX .013
CLEARANCE
.013-.56 CLEARANCE .013-.07
CRANKSHAFT END PLAY .09-.20
ROD SIDE CLEARANCE .15-.6
CYLINDER / 1MB PISTON
CYLINDER BORE
PISTON RING GAP
DIAMETER 101.6
TOP COMPRESSION .30-.50
OUT-OF-ROUND-MAX .02
SECOND COMPRESSION .30-.5
TAPER
.13 OIL CONTROL .5-1.5
PISTON CLEARANCE .036-.056
PISTON RING SIDE CLEARANCE
MEASURED 46 MM DOWN FROM
TOP COMPRESSION .05-.08
PISTON TOP
SECOND COMPRESSION .03-.08
PISTON PIN
OIL CONTROL .38-1.40
DIAMETER 23.825-23.927
FIT IN PISTON
.005-.010
FIT IN ROD P R E S S
J20007-6A4
Fig. 81 6 Engine Specifications (Metric)