From serial number 2616142, the TU1M+ engine receives new pistons and conrods and becomes the modernised TU1M+
General specifications
| engine code | modernised TU1M+ | modernised TU1M+ |
|---|---|---|
| legislation type | HDY | HDZ |
| identification marking | 10FP5M | 10FP4X 10FP4Y |
| number of cylinders | 4 | |
| bore x stroke (mm) | 72 x 69 | |
| capacity (cc) | 1124 | |
| compression ratio | 9.4 | 9.7 |
| maximum power (hp DIN) | 54.3 | 59.9 |
| maximum power (EEC kW) | 40 | 44.1 |
| corresponding engine speed (rpm) | 6200 | |
| maximum torque (EEC daNm) | 8.75 | |
| corresponding engine speed (rpm) | 3800 | |
| turbocharger | - | |
| exchanger | ||
| turbocharger pressure (millibars) | ||
| injection system | Monopoint | |
| make | BOSCH | |
| type | MA3.1 | |
Presentation
Piston - shaft - sealing ring
| TU1M+ | modernised TU1M+ | |
|---|---|---|
| A | 60 | 47.5 |
| ØB | 19.5 | 17.97 |
| C | 1.5 | 1.5 |
| D | 2 | 1.5 |
| E | 3 | 2.5 |
| part number pistons + liners | 0111.Y8 | 0111.Z6 |
| part number set of piston rings | 0640.A2 | 0640.L4 |
The position of the piston rings and gudgeon pin has been moved up towards the piston head
(1) mark 1X identifies the modernised TU1M+ piston
(2) direction mark in relation to the timing gear
(3) diameter category mark (A, B or C)
Connecting rod - bearing shells
| earlier assembly | new assembly | |
|---|---|---|
| ØF +0.016 | 48.655 | |
| ØG +0.017 | 19.463 | 17.939 |
| H ±0.07 | 112.3 | 125.3 |
| part number | 0603.12 | 0603.73 |
The new connecting rod is fitted with an oil jet (4) for spraying the underneath of the piston
The conrod is equipped with a new drilled half bearing shell (part number 0606.P8)
Interchangeability
The new pistons and conrods can be fitted in place of the old ones provided that matches between connecting rods, pistons, pins, rings and connecting rod half shells are observed