Jeep 1987 Wrangler Workshop Manual page 1642

2.5L 1-4 ENGINE OVERHAUL
GENERAL INFORMATION
C a m s h a f t
Tappet Clearance
zero lash (hyd.) tappets
End Play
zero (engine operation)
Bearing Clearance 0.025-0.076 mm 0.001-0.003 in.
Bearing Journal Diameter
No. 1
51.54-51.56 mm 2.029-2.030 in.
No. 2
51.28-51.31 mm 2.019-2.020 in.
No.
3 51.03-51.05 mm 2.009-2.010 in.
No. 4
50.78-50.80 mm
1.999-2.000 in.
Base Circle Runout
0.03 mm max. 0.001 in max.
Cam Lobe Lift (Jeep)
Intake
.265 in.
Exhaust
.265 in.
Cam Lobe Lift (Premier)
Intake
.240 in.
Exhaust
.250 in.
Valve Lift (Jeep)
Intake
.424 in.
Exhaust
.424 in.
Valve Lift (Premier)
Intake
.384 in.
Exhaust
.400 in.
Intake Valve Timing
Opens (Jeep) 12° BTDC
Opens (Premier)
9.6° BTDC
Closes (Jeep)
7 8 ° A B D C
Closes (Premier)
5 8 . 5 ° A B D C
Exhaust Valve Timing
Opens (Jeep)
5 6 ° B B D C
Opens (Premier) 5 4 . 6 ° B B D C
Closes (Jeep) 3 4 ° ATDC
Closes (Premier) 31.4° ATDC
Valve Overlap
Jeep
4 6 °
Premier 41°
Intake Duration
Jeep
2 7 0 °
Premier 2 4 8 °
Exhaust Duration
Jeep
2 7 0 °
Premier 2 6 6 °
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