D399, G399, D398, G398, D379, G379 ENGINES Caterpillar


Valves

Usage:



(1) 7S6323 Spring (one spring type):

Length under test force ... 2.219 in.(56,36 mm)

Test force ... 81-89 lbs.(36,7-40,3 kg)

Free length after test ... 2.613 in.(66,37 mm)

Outside diameter ... 1.731 in.(43,97 mm)

4L5408 Outer Spring (two spring type):

Length under test force ... 1.953 in.(49,61 mm)

Test force ... 50-55 lbs.(22,7-24,9 kg)

Free length after test ... 2.422 in.(61,52 mm)

Outside diameter ... 1.635-1.645 in.(41,53-41,78 mm)

4F5409 Inner spring (two spring type):

Length under test force ... 1.922 in.(49,82 mm)

Test force ... 27-30 lbs.(12,3-13,6 kg)

Free length after test ... 2.539 in.(59,92 mm)

Outside diameter ... 1.145 in.(29,08 mm)

(2) Diameter of valve stem:

7M7817 Inlet for Diesel and Gas ... .495-.496 in.(12,57-12,59 mm)

3N1141 Exhaust for Diesel ... .495-.496 in.(12,57-12,59 mm)

5S5323 Exhaust for Gas ... .4956-.4966 in.(12,588-12,614 mm)

Maximum permissible clearance between valve stem and guide:

Diesel ... .009 in.(0,229 mm)

(3) Minimum lip thickness (inlet):

7M7817 Diesel ... .140 in.(3,56 mm)

7M7817 Gas ... .128 in.(3,25 mm)

Minimum lip thickness (exhaust):

3N1141 Diesel ... .124 in.(3,15 mm)

5S5323 Gas ... .122 in.(3,10 mm)

(4) Valve face angle ... 291/4°

(5) Inlet valve head diameter ... 2.500-2.510 in.(63,50-63,75 mm)

Exhaust valve head diameter ... 2.345-2.355 in.(59,56-59,81 mm)

Caterpillar Information System:

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