PSP FOR INCREASING THE LUBRICATION TO THE VALVE TRAIN ON CERTAIN LOW SPEED 3406B GENERATOR SET, INDUSTRIAL, AND MARINE ENG INES - PS4632 - MAILED US AND CANADA, CACO, CFEL, MARINE TEPS, LIMITED COFA, LIMITED COSA Caterpillar

June 1, 1991
U-111
A-79
AU-66.1
E-70
O-82.1
TM-10
PRODUCT SUPPORT PROGRAM FOR INCREASING THE LUBRICATION TO THE VALVE TRAIN ON
CERTAIN LOW SPEED 3406B GENERATOR SET, INDUSTRIAL, AND MARINE ENGINES
1101   PS4632
NOTE: This Program can be administered either before or after a
failure. In either case the decision whether to apply the Program
is made by the dealer. When reporting the repair, use "PS4632"
as Part Number, "7755" as Group Number, and "96" as Description
Code.

June 30, 1992

Lubrication to the area surrounding the bridge assemblies and the valve
springs can be increased on certain low speed 3406B Generator Set,
Industrial, and Marine Engines. Increasing the lubrication to these areas
will extend the service life of the components by reducing wear at the valve
guides, at the contact point between the rocker arms and the bridge
assemblies, and at the contact point between the bridge assemblies and valve
stems. Worn parts need to be replaced on engines that have wear beyond
thereconditioning limits.
The new rocker arm assemblies and rocker arm shaft assemblies have additional
holes to direct oil towards the bridge assemblies and the valve springs when
the valves are open. See Illustrations 1 and 2.
NOTE: These parts are not to be used in any engine with a rated speed
of 1400 RPM or higher.

Model Identification Number
3406B *2WB4029, 4030, 4049, 4372, 4374, 4375, 4377-4382, 4385-4387,
4875, 5724, 5732, 5908, 6021, 6022, 6049, 6058, 6072, 6077,
6085, 6105, 6191, 6194, 6203, 6210, 6335, 6339, 6355, 6361,
6392, 6398, 6405, 6416, 7497, 7793, 7801, 7980, 8411, 8421,
9216, 9691, 9697, 9768
**4TB758, 767, 945, 1021, 1032, 1034, 1098, 1345, 1352, 1363,
1398, 1400, 1411, 1421, 1446, 1448, 1449, 1459, 1511, 1536,
1759, 1802, 1813, 1815, 1845, 1857, 1884, 1887, 1890, 1917,
1952, 1969, 1982, 2005, 2007, 2017, 2060, 2164, 2257, 2293,
2294, 2477, 2480, 2519, 2577, 2793, 2810, 2866, 2868, 2874,
2878, 2890, 2980, 2982, 2985,
***6TB3606, 3685, 3690, 3691, 3693, 3694, 3697, 3698, 3700, 3818,
3854, 3883, 3894, 4222, 4750, 4796, 4816, 4839, 4883, 5524,
5571, 5618, 5699, 5864, 5902, 6466, 7045, 7051, 7058, 7085,
8338
* Gen Set Engines with 7C2255, 7C2256, or 7C2257 Arrangement
** Marine Engines with 7W7264 Arrangement
*** Industrial Engines with 7W4640 Arrangement

***** Before Failure *****
12 - 4P5259 Rocker Arm Assembly
2 - 4P5261 Rocker Arm Shaft Assembly
5P5678 Seal-Valve Cover (6 meters long)
***** After Failure *****
12 - 4P5259 Rocker Arm Assembly
2 - 4P5261 Rocker Arm Shaft Assembly
*6 - 4W2684 Bridge Assembly-Exhaust (use only if required)
*6 - 4N5612 Bridge Assembly-Intake (use only if required)
1 - ** Remanufactured Cylinder Head
1 - ** Gasket Kit-Cylinder Head
1 - 6V4867 Molycoat
* Recondition existing bridge assemblies if possible.
** Part numbers varies by application. Refer to the appropriate parts book
microfiche and select the correct cylinder head gasket kit. Make sure
thegasket kit contains a 7E6000 Cylinder Head Gasket. Record the part number
of
the cylinder head group and refer to the Remanufactured Products Guide for
the correct part number for the remanufactured cylinder head.

1. Remove both rocker arm groups. Install new 4P5259 Rocker Arm Assemblies
and 4P5261 Rocker Arm Shaft Assemblies.
New 4P5259 Rocker Arm Assemblies and 4P5261 Rocker Arm Shaft Assemblies
have additional holes to direct oil towards the bridge assemblies and
the valve springs when the valves are open. Refer to Illustrations 1
and 2.
2. Refer to Illustration 3 and inspect the seat of all the bridge
assemblies to determine if they should be reused, reconditioned, or
replaced.
NOTE: Refer to the article "Reconditioning of Bridge Wear Seats is
Permitted; Will Prevent Bridge Replacement When Not Necessary",
on Page 6 of the May 1990 Engine News.
3. Reuse, recondition or replace the bridge assemblies as required.
NOTE: If the bridge assemblies can be reused as is, make sure they are
installed in their original locations.
4. If the bridge assemblies can be reused or reconditioned (seat wear is
.015 inch or less), it will not be necessary to replace the cylinder
head. If any of the bridge assemblies require replacement, replace the
cylinder head.
****** IMAGE: SEBE4608.00001.001
CAPTION: Illustration 1
****** IMAGE: SEBE4608.00001.002
CAPTION: Illustration 2
****** IMAGE: SEBE4608.00001.003
CAPTION: Illustration 3

Product Caterpillar Dealer Suggested Customer Suggested
smu Parts Labor Hrs. Parts Labor Hrs. Parts Labor Hrs.
***** Before Failure *****
***** Generator Set, Industrial, and Marine Engines *****
0-4000 100% 3.3 0 0 0 0
4001-6000 33 1/3% 1.7 0 0 50% 1.6
NOTE: This is a 3.3-hour job.
***** After Failure *****
***** Generator Set and Industrial Engines *****
0-4000 100% 12.3 0 0 0 0
4001-6000 33 1/3% 6.2 0 0 50% 6.1
NOTE: This is a 12.3-hour job. An additional .2 hour will be allowed
per bridge assembly that is reconditioned. New bridge assemblies
will only be allowed if the existing bridge assemblies can not be
reconditioned.
***** After Failure *****
***** Marine Engines *****
0-4000 100% 17.7 0 0 0 0
4001-6000 33 1/3% 8.9 0 0 50% 8.8
NOTE: This is a 17.7-hour job. An additional .2 hour will be allowed
per bridge assembly that is reconditioned. New bridge assemblies
will only be allowed if the existing bridge assemblies can not be
reconditioned.

Handle the parts in accordance with your Warranty Bulletin on warranty parts
handling.