Engine body
Replacement of valve seat
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 parts.
Fig. 17. A = distance between cylinder head plane and
valves.
The valve seat should be replaced when the distance
"A" in Fig. 17 measured with a new valve exceeds
1.8
mm (.0708").
1.
Remove the old valve seat by heating it up with a
gas jet (600-700°C / 1112-1292°F) diagonally
over the seat.
Allow the cylinder head to cool approx. 3-5 minu-
tes in the air. Carefully tap out the seat with
mandrel (check that the cylinder head is not dama-
ged).
Fig. 18. Checking of valve spindle wear
Diameter mm:
Inlet
Outlet
MD2010, MD2020
5.90 mm
5.90 mm
(.2322 in)
6.84 mm
(.2692 in)
(.2322
in)
Alternatively the valve seat can be milled out
(check that the cylinder head is not damaged).
MD2030, MD2040
6.89 mm
(.2712
in)
Check the wear on the valve spindle. Measure the
diameter with a micrometer at points I, II and III as
per Fig. 18.
�
2.
3.
Clean the seat housing in the cylinder head care-
fully. Check the head for cracking.
Cool down the new seat with liquid nitrogen or the
like to minus 60-70°C (140-158°F) and heat up the
cylinder head to approx. 60-100°C (140-212°F).
4.
Press the seat in the head. Use a hydraulic press
(1000-1500
mandrel.
kp / 2204-3307 lbf) and suitable
5.
Work the seats to the correct angle and width.
Fig. 19. Valve disc edge
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 ap-
plies to valves with crooked valve spindles.
28
| Categories | Volvo Penta Manuals |
|---|---|
| Tags | Volvo Penta MD2010, Volvo Penta MD2020, Volvo Penta MD2030, Volvo Penta MD2040 |
| Download File |
|
| Document File Type | |
| Copyright | Attribution Non-commercial |
(4 votes, average: 4.25 out of 5)
Marine readers have rated Volvo Penta MD2010 MD2020 MD2030 MD2040 Workshop Manual 4.3 out of 5.0 based on 4 product reviews. GOOD AND GOODER S=GOODEST. IS BESTER
jeg skal bruge manualen , til at samle min Volvo penta md 2030 igen.
Ö, hur dka jag veta om det är bra innan jag set produkten.
Pages 58 and 59 are missing from Volvo Penta MD2010 MD2020 MD2030 MD2040 Workshop Manual. I need only these pages at present!