OPERATOR AR 2298707 - Caterpillar

Illustration 1. Items included in the 1U8860 Pickup Group for large bore engines.Use the data obtained by the blowby meter only as additional information concerning engine condition and NOT as a stand-alone good/bad indicator of engine condition. Do NOT use such data alone to determine if the engine should be rebuilt. Other indicators such as high oil consumption, low power, hard starting, and excessive fuel consumption must be considered.
Read the blowby rate at full engine rpm, either at no load or full load. On some engines, the no load blowby may vary as much as 100% from the full load blowby. Use the highest reading for the actual blowby value. System accuracy is 10% of the reading.
On some D397, D398, 3508 and 3512 Engines, the blowby indicator may read zero until the engine is loaded because the blowby is below the minimum rating of the pickup.Optional Items Available
There are five optional items that can be used with the large engine pickup meter in the new pickup group. See Illustration 2 for Item numbers. Item numbers 3, 4, and 5 are also optional items for use with the 8T2700 Indicator Group for small engines, and may already be in your shop.
... (1)-8T2701 Blowby/Airflow Indicator (part of 8T2700 Indicator Group).... (2)-8T5297 Blowby Pickup Cable, 915 mm (36").... (3)-6V2198 Blowby Pickup Cable, 5500 mm (216").... (4)-5P7366 Indicator Power Cable, 5500 mm (216").... (5)-8T5268 Converter. Converts 110/220 Volts AC, 50/60 Hz power supply to 11 to 20 Volts DC at .3 Amp maximum for powering the indicator.
Illustration 2. Optional items available. See text for description and specifications.Using The Large Engine Pickup Group
Special Instruction SEHS8984 comes packaged with the pickup group. Before using the 8T2701 Indicator with the large pickup, install the 1U8863 Blowby V1.20 Conversion Group (Illustration 1) in the indicator. This makes the indicator accurate for both the large pickup and small pickup. The Special Instruction also covers this conversion. Special Instruction SEHS8712 gives more information on the 8T2701 Indicator.
As stated in the Special Instruction, the pickup meter is sensitive to high frequency engine noise. To avoid incorrect readouts, keep the pickup as far from the engine as possible when making blowby measurements. Do not put the pickup near the turbocharger or fan blades because this can cause a reading error.