47
Technical description
Lubrication system
These engines have a forced lubrication system and piston cooling (see “Pistons” on page 43). The oil pump is
of the gear-wheel type and is located at the front of the oil sump. This pump is driven by the engine’s timing
gears.
The oil pump sucks oil up from the oil sump and then forces it out into two main channels in the cylinder block
(see basic diagram on next page). The oil passes through the lubricating oil filter and then on into the engine’s
oil channels for the forced lubrication of the engine, injection pump and turbocharger. The oil also passes
through via the piston cooling valve. From here a small amount of oil is channelled off, which then passes
through a by-pass filter (in the TAMD63, TAMD73 and TAMD74 – accessory in the TAMD71) before being
returned to the oil sump. The rest of the oil continues through the oil cooler and out to the piston cooling jets.
Lubrication TAMD71
1. Main oil channel (lubricating oil) 15. Filtered oil (pressure) to lubri-
2. Pressure line to turbocharger cation system
3. Main oil channel (piston-cooling oil) 16. Oil (pressure) from oil pump
4. Rocker mechanism 17. Return oil to oil sump via relief
5. Oil channel to rocker mechanism valve
6. Main bearings. 18. Oil (pressure) via piston cool-
7. Big-end bearings ing valve to oil cooler and piston
8. Oil pump cooling
9. Oil to oil cooler and piston cooling 19. Return oil to oil sump (via by-
10. Lubricating oil filter (full flow type) pass filter, if fitted)
11. Camshaft bearings 20. Filtered oil returning from lubri-
12. Overflow valve cating oil filter
13. Piston cooling valve 21. Unfiltered oil to lubricating oil
14. Relief valve filter
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