PUMP GP-GEAR 3494087 - Caterpillar

History
1. In 1981 the 4N-5654 Intake Valve was canceled and replaced by (CRB) the 1W-3859 Intake Valve. At the same time the 7N-4580 Exhaust Valve was CRB the 1W-3860 Exhaust Valve.2. A Service Magazine article, dated September 6, 1982, titled "Improved Inlet And Exhaust Valves" announced the above changes and said the former valves could be installed again if they were in usable condition.3. In 1983, the 1W-3859 Intake Valve was CRB the 2W-2622 Intake Valve to provide a valve that did not use cobalt.4. A Service Magazine article, dated September 3, 1984, titled "New Inlet Valve Used" announced the new 2W-2622 Intake Valve.5. A Special Edition of Service Magazine, dated September 9, 1985, titled "New Inlet Valve And Exhaust Valve" announced the new 2W2622 Intake Valve and new 1W3860 Exhaust Valve. This article recommended that the former valves not be reused if they had previously been used in 3408 or 3412 vehicular engines. The former valve could be reused if they were from other 3400 engine applications.6. Currently, the remanufacturing facility conducts an "Eddy Current Test" on all 3400 intake valves before they are used again. Caterpillar engine engineering has approved the reuse of all intake valves from any former 3400 applications, as long as those valves pass all required inspections.