Pontiac firebird 1968 - Page 252

SIX CYLINDER ENGINE
6-35
6-CYLINDER ENGINE SPECIFICATIONS (Cont.)
Ring Gap
Compression (±.010) . • . . • • . . . • ........ .015"
Oil (±.020)......... .035"
Side Clearance (Ring to Groove) ......................................... .0015"-.005"
Piston Pin
Material Extruded SAE 5015 Steel
Diameter .9272"
Wall Thickness .37"
Length 3.00"
Fit in Piston .0003"-.0005"
Fit in Rod
e
Press
Connecting Rod
Material SAE 1037 or 1038 Steel
Weight (oz.) 20.5
Length (Center to Cenler) . . . ...
v
. .......... . 5.70"
Bearings
Length .84"
Clearance 0005"-.0028"
Material - 1-Bbl. Moraine 100-A
- Q'Jet ................
e
............ . Moraine 400-A
Endplay on Crankshaft..... .008"-.014"
Crankshaft
Material Nodular Iron
No. of Bearings . . . 7
Main Bearing Material - 1-Bbl. Durex 100-A
- Q
f
Jet Moraine 400
Thrust Taken On. No. 7
Crankshaft Endplay . 002"-.006"
Journal Diameter 2.30"
Main Bearing Length - 1-6 • . • • • .80"
- Rear 1.01"
Clearance , . . .0003"-.0020"
Crankpin Diameter 2.00"
Flywheel and Sprockets
Flywheel-Material-Manual Cast Iron
-Automatic Stamped Steel
-No. of Teeth 155
Starter Motor Drive-No. of Teeth 9
Crankshaft Sprocket-Material Hardened Cast Iron
-No. of Teeth 19
Camshaft Sprocket-Material Hardened Cast Iron
-No. of Teeth 38
Timing Chain Neoprene Belt with Fiber Glass Cord Reinforcement
-No. of Teeth 98
Harmonic Balancer , Cast Iron Weight with Rubber Floated Cast Pulley
Camshaft
Material Hardened Alloy Cast Iron
Bearings - Number 7
- Type Integral with Aluminum Cover
- Diameter-All 2.22"
Valve System
Valve Lifter None
Lash Taken Up By Stationary Hydraulic Lash Adjuster
Leak-Down Rate 34 Sec. Min. With 50 Lb. Load
Plunger Travel (For Gauging Purposes) • 125"
Pushrod « None
Rocker Arm - Type Cam Follower
- Material Hardened Alloy Cast Iron
- Ratio 1.5:1
Rocker Arm Pivot Point Lash Adjuster