Exhaust Manifold Gasket Removed From Between Exhaust Sleeve And Manifold Section.
Usage:
3500 Family Of Engines
The 7N4903 Manifold Gasket has been removed from between the 7N4902 Exhaust Sleeve and the manifold section. The surfaces of the exhaust sleeve and the manifold sections are sufficiently flat to provide sealing capability under normal service conditions.
NOTE: This change affects only engines without water cooled exhaust systems.
The effective serial numbers of this change are: 1ZF1, 23Z1343, 24Z2164, 25Z1197, 27Z661, 28Z622, 3YF1, 4XF1, 49Y518, 51Y541, 65Z658, 67Z612, 68Z733, 70Z602, 71Z270, 73Z240, 95Y691, 97Y666.
Engines built after these serial numbers will be assembled without the 7N4903 Gasket. The gasket is available as a parts service item.
Caterpillar Information System:
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1989/11/01 New Spacer Used In Attachment Alternator Belt Guard Group
1989/11/01 New Shaft Assembly And Lever Assembly Used In Air Shut-Off Group
1989/11/01 Different Thread Lubricant Can Be Used On Connecting Rod, Main Bearing Cap And Counterweight Bolts
1989/11/01 New Water Level Gauge Group For Folded Core Radiators
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1989/11/01 New Gasket With Stainless Steel Flange Used In Exhaust Manifold Group
1989/11/01 Cylinder Liner Changes
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1989/12/01 Additional Information For Checking Valve Camshaft Timing