Usage:
Camshaft
Inspect the camshaft for wear or damage. There must be no pits or scuffing on the surface of the camshaft lobes. If damage is found on a camshaft lobe, inspect the valve lifter for that lobe for damage. Check the diameter of the camshaft bearing journals and the camshaft lobe height.
Camshaft bearing journals have a diameter of 2.5000 ± .0005 in. (63.500 ± 0.013 mm) and the minimum diameter worn is 2.4970 in. (63.424 mm).
To find lobe lift (A) of camshaft, use the following procedure:
1. Measure lobe height (B) of one exhaust and one intake lobe.
2. Measure base circle (C) of one exhaust and one intake lobe.
3. Subtract base circle (C) dimension (STEP 2) from lobe height (B) dimension (STEP 1). The difference is actual lobe lift (A).
- (a) Exhaust lobe ... .370 in.(9.40 mm)
- (b) Intake lobe ... .367 in.(9.33 mm)
4. The specified (new) lobe lift (A) is:
5. The maximum permissible difference between actual lobe lift (STEP 3) and specified lobe lift (STEP 4) is .010 in. (0.25 mm).
CAMSHAFT LOBE
A. Lobe lift. B. Lobe height. C. Base circle.
With camshaft installed in the cylinder block, check end play. End play with new components should be .007 ± .003 in. (0.18 ± 0.08 mm). The maximum permissible end play is .020 in. (0.51 mm).
Valve Lifters
Inspect lifters for wear or damage. The roller must turn freely in the lifter. There must be no deep scratches (grooves) on the side of the lifter body, and there can be no pits or scuffing on the wear surface of the roller.
If the lifters do not have wear or damage, the lifter can be used again with either a new or used camshaft.
NOTE: New lifter guide springs must be installed anytime the lifters are removed from the lifter bores.
Camshaft Gears
1. Remove screw (1) and washer (2) from end of camshaft.
REMOVING TIMING ADVANCE RETAINING SCREW
1. Screw. 2. Washer.
2. Remove timing advance unit from the camshaft.
3. Install puller (A), with spacer (C) over the shaft in the camshaft. Put spacer (B) on spacer (C) as shown and remove the gear from the camshaft.
REMOVING GEAR (Typical Example)
A. 1P2321 Puller. B. 8S5579 Spacer. C. 9S9155 Spacer.
To install the gear use the following procedure:
1. Heat the gear to a temperature of approximately 400° F (204° C) before installing on the camshaft.
| NOTICE |
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Do not heat the gear with a torch. Do not heat the gear to a temperature of more than 600°F (315°C). Heating the gear with a torch or to a temperature of more than 600°F (315°C) may cause the two drive dowels for the automatic timing advance to loosen and come out of the gear. |
2. Align slot in gear hub with the pin in the camshaft. Install the gear on the camshaft with timing mark on gear aligned with timing mark on crankshaft gear. Be sure the gear is completely seated against the shoulder of the camshaft.
| NOTICE |
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Do not drive the gear on the camshaft. |
3. Align holes in weights with dowels in gear and install the automatic timing advance.
4. Align pin (3) in washer with hole (4) in camshaft and install washer (2).
5. Install screw (1) and tighten to 70 ± 5 lb. in. (7.9 ± 0.6 N·m). Stake screw in two places.
INSTALLING WASHER
2. Washer. 3. Pin. 4. Hole.
| NOTICE |
|---|
Stake screw (1) carefully. Heavy blows on washer or screw can force the shaft extension too far into the camshaft and eliminate all end clearance. |
6. After screw (1) is staked, the gear and weight assembly requires .003 to .037 in. (0.08 to 0.94 mm) end clearance to prevent binding against the washer, camshaft end or camshaft gear.
STAKING SCREW
1. Screw.
Camshaft Bearings Removal And Installation
Remove camshaft bearings using the 1P5544 Washer (1) and S509 Bolt (2), from the 1P5545 Adapter Group, in conjunction with the 8S2241 Camshaft Bearing Removal and Installation Group, and the 8H684 Ratchet Box Wrench.
INSTALLING WASHER
1. 1P5544 Washer. 2. S509 Bolt.
With removal tools installed on cylinder block, remove bearings.
REMOVING CAMSHAFT BEARINGS
Use the 1P5545 Adapter Group in conjunction with the 8S2241 Camshaft Bearing Removal and Installation Group, and the 8S684 Ratchet Box Wrench to install camshaft bearing.
INSTALLING CAMSHAFT BEARINGS
The 1P5545 Adapter Group pilots in the camshaft bearing bore and also pilots the bearing into the bore. This insures bearing alignment. Install bearings from chamfered side of the bore and align oil hole in bearings with oil holes in cylinder block.
To install the camshaft front bearing, it is necessary to machine a notch in the 8S8289 Tube (3) for clearance of the boss that projects above the camshaft bearing bore. Machine the notch 1 1/2 in. (38.1 mm) wide, 3/8 in. (9.5 mm) deep, with a 1/8 in. (3.2 mm) radius or chamfer in the corners and on the edges.
NOTCH IN TUBE
3. 8S8289 Tube. 4. 8S8288 Cone. 5. Notch.
Invert the 8S8288 Cone (4) and install it in the 8S8289 Tube (3) for installation of the camshaft front bearing.
INSTALLING CAMSHAFT FRONT BEARING
3. 8S8289 Tube. 4. 8S8288 Cone.