Section V. CAMSHAFT, CRANKSHAFT AND BEARINGS

lubricating system, the valve may not work freely,

thereby remaining open or failing to open at the

normal operating pressure. The valve opening

pressure is 52 psi.

b. Removal.

(1) Remove the plug and washer from the

engine lower front cover (fig. 3-70).

(2) Withdraw the spring and the valve from

the cover.

c. Inspection. Inspect the valve spring and check

valve for freedom of movement within the engine

cover valve bore.

d. Installation.

(1) Apply clean engine oil, to the outer surface

of the valve and slide the valve into the opening in

the engine lower front cover (closed end first).

(2) Install a new copper gasket on the plug.

( 3 ) While compressing the spring, start the

plug in the cover. Tighten the plug.

Figure 3-70. Oil pressure regulator, removal and installation.

Section V. CAMSHAFT, CRANKSHAFT AND BEARINGS

3-28. General

(2) Refer to figure 3-71 and remove front

cover.

The camshaft has lobes that operate the push rods

c . Disassembly. After front cover is removed,

and directly operate the valves and fuel injectors.

press oil seal from front cover.

Crankshaft thrust is taken through two piece

d. Cleaning and Inspection.

washers on each side of the rear main bearing. All

(1) Clean the front cover.

main and connecting rod bearing journal surfaces

(2) Inspect cover for cracks or damage.

a n d oil seal surfaces are induction hardened.

(3) Inspect oil seals for wear or damage,

Crankshaft wear is usually associated with bearing

replace if necessary.

troubles. Therefore, whenever main or connecting

e. Install Oil Seals.

rod bearings are inspected, the crankshaft should

(1) Support inner face of cover on woodblocks.

a l s o be inspected. The camshaft is located just

( 2 ) If outside diameter of oil seal is not

below the top of the cylinder block. The shafts are

precoated with sealant, coat the bore in cover with

supported by bearings (bushing type) that are

nonhardening sealant.

pressed into bores in the cylinder block. The

(3) Position oil seal in cover with lip of seal

c a m s h a f t is supported by end, intermediate, and

pointing toward inner face of cover.

c e n t e r bearings. Lubrication is supplied under

CAUTION

pressure to the end bearings by way of passages in

Keep lip of the oil seal clean and free of

the cylinder block which lead from the main oil

scratches.

gallery. From the end bearings, oil passes through

(4) Press oil seal into cover until seal is flush

the hollow camshaft to the intermediate and center

with bottom of counterbore.

bearings.

(5) Install second oil seal in same manner.

3 - 2 9 . Engine Front Cover (Upper)

( 6 ) Remove excess sealant from cover and

seals.

a. General. The engine upper front cover is

f. Installation.

attached to the cylinder block with attaching bolts.

(1) Affix a new gasket to cover.

The camshaft oil seals are pressed into the cover.

(2) Install cover on engine. Tighten bolts to 35

b. Removal.

foot-pounds torque.

(1) Remove various parts and assemblies from

(3) Apply grease to the outside diameter of oil

e n g i n e upper front cover as outlined in their

seal spacers; then, slide them on the shaft.

respective paragraph of this manual.

3-83