US WWII Aeroengine Depot Overhaul Times
Created 30 March 2017

Source: USAAF Statistical Digest, WWII – Page 216, Table 115: Average Man-Hours Expended per Major Engine Overhaul at Depots in Continental US, by type of engine: Jul 1943 to Aug 1945 (PDF Excerpt), which lists as a source Air Technical Service Command, Statistical Control Office.

CHANGES: I have cleaned up the table by adding engine manufacturer, typical use, and yearly/global averages.

Month

Type of Engine

P&W
R-1340
Wasp
(SOC, T-6)

Packard
V-1650
Merlin
(P-51D)

Allison
V-1710
(P-40, P-51A)

Wright
R-1820
Cyclone 9
(B-17, SBD)

P&W
R-1830
Twin Wasp
(B-24, F4F)

Wright
R-2600
Cyclone 14
(SB2C, B-25)

P&W
R-2800
Double Wasp
(F6F, P-47)

Wright
R-3350
Duplex-Cyclone
(B-29, B-32)

July 1943

214

462

376

250

382

496

714

N/A

August 1943

147

592

339

255

364

492

510

N/A

September 1943

165

391

315

204

278

445

452

N/A

October 1943

196

401

334

189

259

380

445

N/A

November 1943

176

451

242

177

252

334

478

424

December 1943

118

489

242

151

224

282

499

593

1943 Average

169.3

464.3

308.0

204.3

293.2

404.8

516.3

508.5

January 1944

121

368

223

131

195

240

397

518

February 1944

104

342

194

132

189

240

318

342

March 1944

102

419

192

112

167

350

383

342

April 1944

117

366

191

148

199

217

385

347

May 1944

89

247

174

104

157

178

293

300

June 1944

103

190

156

110

148

206

216

274

July 1944

92

216

168

113

189

224

257

269

August 1944

90

206

149

96

156

209

254

233

September 1944

80

336

152

93

145

184

276

278

October 1944

100

245

141

108

144

190

270

264

November 1944

89

N/A

124

119

156

186

234

237

December 1944

74

217

127

113

150

313

248

259

1944 Average

96.8

286.5

165.9

114.9

166.3

228.1

294.3

305.3

January 1945

62

262

141

112

147

209

235

243

February 1945

64

256

120

105

148

196

246

249

March 1945

65

236

142

96

147

210

245

267

April 1945

77

292

155

95

137

227

235

238

May 1945

64

244

172

92

144

207

252

246

June 1945

66

240

143

92

142

165

236

258

July 1945

77

266

149

82

135

165

233

273

August 1945

86

272

117

77

147

116

249

254

1945 Average

70.1

258.5

142.4

93.9

143.4

186.9

241.4

253.5

1943-1945 Average

112.1

336.5

205.4

137.7

200.9

273.3

350.7

355.8