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 exhaust system faults and their resolutions for various models.
| Identifier | ExFiles\Box 47\3\ Scan480 | |
| Date | 1st June 1932 guessed | |
| -7- 20 HP. 25 HP. PH.I. PH.II. TOTAL. GRAND TOTAL. REMARKS. EXHAUST MANIFOLD CRACKED OR BROKEN. June Quarter. C.C. 8 11 - - 21 ) 35 W.P. 6 5 2 3 14 ) Previous " C.C. 3 7 1 4 15 ) 38 W.P. 15 7 - 1 23 ) Six months. 32 30 3 8 73 73 REMARKS. 20 HP. & Early 20/25 HP - Exhaust Manifolds with cooling fins are now available. Depot Sheet Hd.{Mr Hayward/Mr Huddy}229. Ph.I - Expansion Allowance now increased & malleable castings available. Also sliding joint type of exhaust manifold being tried out for extreme cases. Ph.II - Flange bosses now thickened up to prevent cracking. EXHAUST SILENCER CORRODED. June Quarter. C.C. 1 - 2 3 6 ) 9 W.P. - - 1 2 3 ) Previous " C.C. - - 3 2 5 ) 5 W.P. - - 1 1 2 ) Six months. 1 - 7 6 14 14 Ph.I - Silencers are now being coslettised for replacement purposes. EXHAUST WASHERS BLOWING. June Quarter. C.C. - 4 - 1 5 ) 5 W.P. - - - - - ) Previous " C.C. 1 10 - - 11 ) 15 W.P. 3 1 - - 4 ) Six months. 4 15 - 1 20 20 20/25 HP - New steel washers with all copper shell, instead of half brass and half copper, are now available. EXHAUST BLOWS GENERALLY & CUTOUT SEIZED OR RATTLE. June Quarter. C.C. 4 6 1 38 48 ) 84 W.P. - 2 - 33 36 ) Previous " C.C. - 4 1 30 35 ) 70 W.P. - 3 5 27 35 ) Six Months. 4 15 7 128 154 154 This trouble on Ph.II is caused by the sliding joint not working, and is definitely cured by modifying the sliding joint as per Depot Sheet No. Hd.{Mr Hayward/Mr Huddy}199 and fitting an additional stay to the rear silencer as per Depot Sheet No. Hd.{Mr Hayward/Mr Huddy}218. | ||