AIR COMPRESSOR GP 1647566 - Caterpillar

3508 (95Y, 68Z),
3512 (1LM, 49Y, 65Z),
3516 (27Z, 71Z) Industrial;
3508 (6TJ),
3512 (2WK),
3516 (9KF) Locomotive;
3508 (96Y, 69Z),
3508 With EUI (3PS),
3508B (2BM, 7SM, 1TW),
3512 (50Y, 66Z),
3512 With EUI (3RS),
3512B (7HM, 4TN, 2GW),
3516 (29Z, 72Z),
3516 With EUI (3SS),
3516B (8CN, 8KN, 3CS) Marine;
3508 With EUI (3TS),
3508B (3DM, 3DW),
3512 With EUI (3WS),
3512B (8EM, 1PW),
3516 With EUI (3XS),
3516B (9AN, 2FW) Marine Auxiliary;
3508 (23Z, 70Z),
3508 With EUI (5XM, 3LS),
3508B (4GM, 6PN, 2HW),
3512 (24Z, 67Z),
3512 With EUI (6PM, 3MS),
3512B (8RM, 6WN, 4AW),
3516 (4XF, 5FJ, 25Z, 73Z),
3516 With EUI (7KM, 3NS),
3516B (6HN, 7RN, 1NW) Generator Set;
3508 (97Y),
3512 (51Y),
3516 (28Z) Vehicular EnginesReference: Engine News, October 1997, Page 2, "Improved Piston Crown Assembly Used In The Rod And Piston Group". Engine News, October 1997, Page 3, "New Piston Crown Improves Service Life". Engine News, May 1997, Page 6, "Improved Cylinder Liner Has Longer Service Life". Engine News, July 1996, Page 7, "New Oil Jet Tube Assemblies Replace Oil Cooling Jet Assemblies". Engine News, This Issue, "Piston And Piston Ring Reference Chart For 3500 And 3500B Engines". Engine News, This Issue, "New Piston Rings Provide Increased Service Life".3500B and 3500 engines with two piece pistons now use new piston rings. See the Reference Article, "New Piston Rings Provide Increased Service Life" in this issue.
The new piston rings are more robust and will have a longer service life. The new piston rings are also less susceptible to corrosive and abrasive wear. But engines with a history of abrasive or corrosive wear problems will continue see these problems, even with the new piston rings. Therefore, it is important to find the source of these problems so they can be corrected. The following information reviews the possible causes and corrections for excessive wear to pistons, rings, and liners.
The prime cause of broken piston rings is excessive wear. The two main causes of wear that lead to shortened piston ring life and shortened engine life are Abrasive Wear and Corrosive Wear Engines with abrasive and/or corrosive wear will have a high wear rate between the piston rings and piston ring grooves, and also between the piston ring face and cylinder liner bore. Excessive piston, ring, and liner wear will result in high oil consumption, high blowby, and sometimes broken piston rings.
Abrasive Wear
Abrasive wear comes from dirt entering the air intake system. This can be the result of one or more of the following: * Very dusty applications.* Separation of air piping or loose clamps between the air filters and turbochargers.* Too frequent air filter servicing (service the filter elements as per the indicator).* Too little air filter servicing (filter elements are plugged).* Inadequate filter element maintenance (rough cleaning or insufficient checking for holes in the filter element media before reuse).
Abrasive wear can be identified by the presence of silicone from the dirt in the abrasive scratches on worn parts. Unfortunately, this can only be seen with an electron microscope. Testing engine oil [Scheduled Oil Sampling oil analysis (S O S)] for the presence of silicon is another way to identify the likelihood of