VOLVO MD2010, MD2020, MD2030, MD2040 Engine Grinding of valves and valve seats
1. Use a valve spring tensioner and dismantle the
valve lock. Remove the valve spring washers,
springs and aloes. Place the parts in the correct
order in a valve rack. Remove the valve stem seals.
2. Clean the part
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3. Check the wear on the valve spindle. Measure the
diameter with a micrometer at points I, II and III as
per Fig. 18.
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4. Grind the valves in a valve grinding machine
Grind the sealing surface as little as possible, just
so that it is “clean”. If the the valve disc edge after
grinding is less than 0.5 mm (.019 in) the valve
should be scrapped (see Fig. 19). The same applies to valves with crooked valve spindles
5. Check the wear on the valve guides (see “Checki ng of valve guides”) before the valve seats are
treated.
6. Ream or grind the valve seats (Fig. 20). Grind of
j ust enough material so that the valve seat has the
right shape and a good mating surface.
Replace the valve seat when the distance “A” in Fig. 21,
measured with a new valve, exceeds 1.8 mm (.0708 in).
For replacement of the valve seat (inlet) see previous
page.
New seats are grind down so that the distance between the cylinder head plane and the valve disc
surface “A” is:
MD2O10, MD2020: 0.70-0.90 mm (.0275-.0354 in)
MD2030, MD2040 : 0.85-1.15 mm (.0334-.0452 in)
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7. Grind in the valves with grinding paste and check
the contact with marker dye
8. Fit the seals, valves, valve springs, spring washers,
valve lock and valve caps. See “Assembly of cylinder head” on page 31.
