Lubrication System - Volvo Penta TAMD63L Instruction Book

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.
Technical description
Lubrication TAMD71
1. Main oil channel (lubricating oil)
2. Pressure line to turbocharger
3. Main oil channel (piston-cooling oil) 16. Oil (pressure) from oil pump
4. Rocker mechanism
5. Oil channel to rocker mechanism
6. Main bearings.
7. Big-end bearings
8. Oil pump
9. Oil to oil cooler and piston cooling
10. Lubricating oil filter (full flow type)
11. Camshaft bearings
12. Overflow valve
13. Piston cooling valve
14. Relief valve
15. Filtered oil (pressure) to lubri-
cation system
17. Return oil to oil sump via relief
valve
18. Oil (pressure) via piston cool-
ing valve to oil cooler and piston
cooling
19. Return oil to oil sump (via by-
pass filter, if fitted)
20. Filtered oil returning from lubri-
cating oil filter
21. Unfiltered oil to lubricating oil
filter
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