SUPPLEMENT FOR UPRATED 3500 ENGINES Caterpillar

(1) Thickness of washer (new) ... 8.50 ± 0.05 mm (.335 ± .002 in.)

Thickness of groove in camshaft (new) ... 8.75 ± 0.05 mm (.344 ± .002 in.)

End play for the camshafts (new) ... 0.15 to 0.35 mm (.006 to .014 in.)

(2) Diameter of the surfaces (journals) for the camshaft bearings (new) ... 85.88 ± 0.02 mm (3.381 ± .001 in.)

Bore in the bearings for the camshafts (after assembly) ... 86.00 ± 0.06 mm (3.386 ± .002 in.)

(4) 3512 and 3516 Engines:

Clean the threads of the bolts and the contact surfaces of the parts thoroughly. Put 9S3263 Thread Lock on the bolt threads and tighten to a torque of (hand tighten only) ... 55 ± 7 N·m (41 ± 5 lb.ft.)

(5) Height of camshaft lobes.

To find lobe height, use the procedure that follows:

A. Measure camshaft lobe height (5).

B. Measure base circle (7).

C. Subtract base circle (STEP B) from lobe height (STEP A). The difference is actual lobe lift.

D. Specified camshaft lobe lift (6) is:

a. Exhaust lobe ... 9.078 mm (.3574 in.)

b. Intake lobe ... 9.314 mm (.3667 in.)

c. Injector lobe:

Engines rated at 900 to 1300 rpm ... 13.574 mm (.5344 in.)

Engines rated at 1301 to 1800 rpm ... 13.731 mm (.5406 in.)