Usage:
D10, 641B, 650B, 651B, 657B, 660B, 666B, 772, 776 Tractors;
773, 777 Trucks;
992 Loaders;
D348, D349 Off-Highway Truck Engines
- SUPPLEMENT: 10/04/82
SERVICE MAGAZINE, JULY 19, 1982, PAGE 10. In the article "Temporary Use Of Secondary Oil Filter Can Prevent Damage To Rebuilt Engines", add the information that follows to the paragraph above the "Filter Parts" chart:
For D348 Engines used in D10 and 776 Tractors, 777 Trucks, and 992 Loaders, modification of the flywheel housing is necessary on engines with Serial Numbers 98S1-2103 only. For D348 Engines 98S2104-Up, the secondary filter can be used with no modification to the housing.
Also, in the "Secondary Filter Application" chart, add a footnote under the chart for D10 Tractors, 776 Tractors, 777 Trucks, and 992 Loaders. The footnote must read as follows:
"On D348 Engines 98S2104-Up, the secondary filter can be used with no modification of the flywheel housing."
--------------- END SUPPLEMENT ---------------
During engine overhaul or reconditioning, it is difficult to make sure all oil passages are completely clean. When the rebuilt engine is first started for dynamometer tests, any dirt or other foreign material in the oil system between the filter and the engine bearings can cause engine damage.
For any of the above engines which have one of the flywheel housings shown in the chart, a secondary filter is now available to prevent this problem. The secondary filter can be installed temporarily in the main oil gallery (passage) of the engine to remove particles of foreign material from the oil during the dynamometer test. This screen-type filter will remove large particles (100 micrometers or larger). It will not remove debris already in the main oil gallery of the cylinder block. The secondary filter must be removed after the test, and generally can be cleaned and used again several times.
To use the secondary filter on engines with earlier flywheel housings, it will be necessary to machine the housing. The topics that follow give the necessary information to machine the earlier flywheel housings, and procedures for use of the secondary filter.
Earlier Flywheel Housings
Earlier flywheel housings have a 38.10 mm (1.500") diameter hole near the top of the housing. The location of the hole is on the vertical centerline of the crankshaft opening, 251.46 mm (9.900") above the horizontal centerline of the crankshaft opening. See Illustrations 1 and 2. This hole must be cut larger, as follows:
1. Start from the front (engine) side, and machine the hole to a diameter of 41.28 mm (1.625") all the way through the housing. See Illustration 3.
2. Remove any burrs (metal particles) and/or sharp edges around the hole.
3. Thoroughly clean the flywheel housing to remove all metal chips, dirt, and other foreign material.
Illustration 1. Location of hole to be machined in flywheel housing.
Illustration 2. View of oil gallery (passage) in flywheel housing.
Illustration 3. Cross section through hole to be machined.
Secondary Filter
Installation: Install the 5P8066 Seal on the 2W647 Filter Assembly from the small end, then install the filter into the oil passage small end first. See Illustration 4. The small end of the filter extends through the 1S521 Ferrule into the passage in the cylinder block. Install the 6B2818 Spring behind the filter, then install the 2P8933 Cover.
Illustration 4. Installation of secondary filter and parts.
Dynamometer Test: Since the standard oil pressure gauge is connected at the oil passage in the flywheel housing, a second oil pressure gauge must be connected to the oil passage in the timing gear housing. This makes it possible to check the engine oil pressure on both the inlet and outlet sides of the secondary filter for protection of the engine from damage.
Make engine tests as follows, and make a record of the engine rpm, oil temperature, and the oil pressure shown on each gauge during the test.
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- A. At 1000 rpm with the engine cold.
- B. At rated rpm and rated load after engine temperatures are normal.
- A. At 1000 rpm with the engine cold.
During these tests, check both oil pressure gauges carefully. Stop the engine immediately if any of the three conditions that follow are seen.
1. If either gauge shows less than 240 kPa (35 psi) oil pressure at rated engine rpm. This is the minimum permissible pressure.
2. If there is a difference of more than 70 to 105 kPa (10 to 15 psi) between the gauge indications at rated engine rpm. This is the maximum permissible pressure difference.
3. If there is a sudden reduction of pressure shown on the gauge connected at the timing gear housing. This is an indication that the secondary filter is filled with debris, so there is a restriction of oil flow.
Filter Removal: After the engine has been tested on the dynamometer, the secondary filter must be removed. To do this, it is necessary to remove the engine flywheel and the 2P8933 Cover. Then remove the 6B2818 Spring and the 2W647 Filter Assembly with the 5P8066 Seal. Do not remove the 1S521 Ferrule and its seal. Be careful to prevent damage to the 2W647 Secondary Filter Assembly, so it can be cleaned and used again.
Clean The Filter: Use new, clean kerosene, Stanisol, or a similar fluid to wash the filter. Low pressure air or a soft brush can be used to remove particles from inside the filter. Also, if desired, an ultrasonic (high frequency sound) type cleaner can be used to loosen particles of dirt. Work very carefully to prevent damage to the fine screen of the filter, because a filter with a damaged screen is not acceptable to use again.
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Kerosene and Stanisol are flammable. When a flammable fluid is used to clean the filter, use caution to prevent fire.
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| NOTICE |
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The secondary filter assembly must be kept clean. Use only new, clean fluid to wash the filter, and work in a clean area. Never permit dirt to get into the filter.
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Inspection: After the filter is cleaned, and before installation for an engine test, make a careful visual inspection of the filter screen. If any cracks or holes can be seen in the screen, do not use the filter. Be especially careful to check the seams (junctions) where the screen is fastened together, and the small end of the taper. Generally, these are the locations where holes are found first.
Storage: Keep the 2W647 Secondary Filter Assembly, 5P8066 Seal, and 6B2818 Spring in a clean package when not in use. The filter and other parts must be clean when installed in an engine.