From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Summary report on faults, leaks, and bearing failures for Merlin III and X engines returned from service.
| Identifier | ExFiles\Box 115\2\ scan0582 | |
| Date | 31th May 1940 | |
| MERLIN III AND X ENGINES RETURNED FOR SERVICE 51 ENGS OUT OF 237 RETURNED BY AIRFORCE FOR THE FOLLOWING. DETAILED REPORTS OF FAULTS FOUND ON 57 ENGS DURING EXAMINATION - OVERHAUL: AVER. HRS 224, 11 GENS. - LOSS OF COMPRESSION: AVER. HRS 171, 12. - ENGS WITH MAGNETO DRIVING GEAR E31691 UNSERVICEABLE: AVER. HRS 176, 27 ENGS. - FAULTY WORK BY AIRCRAFT MECHANICS: AVER. HRS 127, 8. - ENGS WITH PLATING BROKEN ON ROCKER PADS CORRESPONDING CAMS WORN: AVER. HRS 127, 8. - METAL IN FILTERS: AVER. HRS 104, 6. - ENGS WITH BROKEN VALVE SPRINGS: AVER. HRS 107, 5. - INTERNAL GLYCOL LEAKS: AVER. HRS 84, 4. - CRACKED SUMPS: AVER. HRS 175, 2. - DAMAGED BY FOREIGN AIRCRAFT: AVER. HRS 112.5, 1. - APPROX 4% OF CARBURETTERS DEALT WITH IN THE REPAIR DEPT: ARE FOUND TO HAVE JET NEEDLES GUMMED UP. I.E. 380 BLOCKS OF 190 ENGS TESTED FOR INTERNAL GLYCOL LEAKS. UNSHROUDED: - .010" UNSHROUDED RIBBED LINERS: 90 BLOCKS, AVER HRS 145. 4 BLOCKS. - .020" UNSHROUDED RIBBED LINERS: 210 BLOCKS, AVER HRS 103. TOP JOINTS: - .020" SHROUDED RIBBED LINERS MOD 64: 44 BLOCKS, AVER HRS 161. - .010" SHROUDED RIBBED LINERS MOD 114: 8 BLOCKS, AVER HRS 103. LEAKS: - .030" SHROUDED RIBBED LINERS MOD 136: 8 BLOCKS. BEARINGS OF 202 ENGINES EXAMINED MAIN BEARINGS: - 5% SILVER: PARTIAL FAILURE, AVER HRS 149 (83 ENGS); TOTAL FAILURE, AVER HRS 148 (2). - 1% TIN: PARTIAL FAILURE, AVER HRS 23 (18 BLOCKS); TOTAL FAILURE, AVER HRS 36 (1 BLOCK). CONNECTING RODS: - PARTIAL BEARING FAILURE: AVER HRS 172 (9), NONE. - TOTAL FAILURE: AVER HRS 104 (15), NONE. D/BANK. | ||