TUBE AS 1700580 - Caterpillar

3508, 3508B, G3508, 3512, 3512B, G3512, 3516, 3516B, G3516, 3606, G3606, 3608, G3608, 3612, G3612, 3616, and G3616 Engines.Introduction
The 1U-8860 Large Engine Blowby Pickup Group is an optional pickup for use with the 8T-2701 Blowby/Air Flow Indicator.It contains a large 38 mm (1.5 in) I.D. pickup which allows it to be used on large engines without increasing the crankcase pressure.It is designed to monitor the blowby volume on Caterpillar 3500 and 3600 series engines and the larger D300 series engines as well as competitive large engines.The range of this pickup is 94 to 1888 Liters Per Min. (L/min), (200 to 4000 Cubic Feet Per Hour [cfh]).Due to its all metal construction and large size, it is suitable for permanent installation on engines so blowby can be continuously monitored, making it useful for dynamometer rooms or marine or gen set installations.The pickup group can also be used to measure air velocity such as radiator cooling air flow. When connected to the 8T-2701 Blowby/Air Flow Indicator, it provides a digital display of the blowby value (the volume of exhaust gas escaping to the crankcase). This blowby value can be used as an indication of engine condition.However, it should not be used as a stand alone "good/bad" indicator for engine overhaul. It can be used as a signal that other engine condition indicators such as oil consumption, low power, hard starting, and excessive fuel consumption should be checked to determine if an engine is in need of maintenance.The large blowby meter has no moving parts. An ultrasonic sound vortex shedding principle is used to measure the air flow. This principle makes the pickup reliable and virtually maintenance free.This unit will be used to replace the smaller 8T-2685 Pickup for the measurement of 3500 series engine blowby. The 8T-2685 Pickup can be used on these engines, but only for a short duration test since the 50.8 mm (2 in) engine breather tube is reduced to 15.7 mm (.63 in) during the test. The 8T-2701 Blowby/Air Flow Indicator will be used with the larger probe, however a 1U-8863 Conversion Group must be installed to make it accurate. Refer to Installation of the 1U-8863 Conversion Group.Refer to Special Instruction SEHS8712 for additional information on the Blowby/Air Flow Indicator.Adaptability
When used with the 8T-2701 Indicator, the 1U-8860 Pickup can be used to measure the blowby on any engine within the blowby range of 94 to 1888 L/min (200 to 4000 cfh). This includes the larger Caterpillar D300 Engines, the 3500 and 3600 series engines.Smaller D300 and 3500 engines may not have enough blowby at idle or partial load to give a reading when they are in good condition. Therefore, the indicator display will read zero until the engine is loaded.1U-8860 Large Engine Blowby Pickup Group
(1) 6V-7145 Case NEEG2332 Decal (1U-8860 Group)(2) 1U-8861 Pickup - Large Engine Blowby NEEG2331 Decal (1U-8861)(3) 1U-8863 Conversion Group - Large Pickup(4) 9M-0164 Hose Clamp - Worm Drive 12.7 mm × 63.5 mm Dia. (.50 in × 2.50 in Dia.) 2 Required.(5)