Engine body
Crank mechanism
Inspection of crankshaft
Dismantling of crankshaft
Clean the crankshaft carefully in all channels after dis-
mantling and inspect it very carefully to confirm whether
it really need renovating.
(engine removed)
1.
Dismantle the reverse gear alt. S-drive and adapter
plate and coupling, flywheel and flywheel housing.
2.
Remove the cylinder head. See under heading
"Dismantling of the cylinder head" on pages 25
and 26.
3.
4.
Remove the valve lifters and place them in order in
a rack.
1
2
1 2
Remove the pistons with connecting rods. Carry
out the work steps to item 5 under the heading
"Dismantling of piston, piston rings and connecting
rod" on pages 34 and 35.
Qum
5.
Remove the timing gear casing. Carry out the work
steps to item 8 and item 10 under the heading "Dis-
mantling of timing gears" on pages 40 and 41.
Fig. 72. Check measurement of crankshaft
1.
Check the wear and out-of-roundness with a mi-
crometer. Measure the diameters "A-A" and "B-B"
in items "1" and "2" (See Fig. 72).
The max. permissible conicity and out-of-roundness
on the main and big-end bearings is 0.05 mm
(.0019
in). Grind the crankshaft to an appropriate
undersize if these values are exceeded. Bearing
cups are available in two oversizes.
2.
Measure the crankshafts longitudinal curvature
(distortion). Place the crankshaft on a pair of V-
blocks placed under the front and rear of the main
bearing journal. Alternatively the shaft can be
braced between spikes. Measuring should be car-
ried out on the middle main bearing journal(s).
Fig. 71. Dismantling of main bearing cap
Max. longitudinal curvature (distortion): 0.06 mm
(.0023
in).
6.
Remove the lock screws which hold the main bear-
ing cap (Fig. 71). Carefully lift off the crankshaft
complete with cap backwards.
If this value is exceeded the crankshaft must be
aligned or replaced.
3.
Check that the mating surfaces on crankshaft seals
are not worn or damaged.
Note: Tape the crankshaft gear to protect the bear-
ing surfaces in the block during dismantling.
7.
Remove the main bearing cap from the crankshaft.
MD2040: Take care of both thrust washers in the
rear cap.
46
| Categories | Volvo Penta Manuals |
|---|---|
| Tags | Volvo Penta MD2010, Volvo Penta MD2020, Volvo Penta MD2030, Volvo Penta MD2040 |
| Download File |
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| Document File Type | |
| Copyright | Attribution Non-commercial |
(4 votes, average: 4.25 out of 5)
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Pages 58 and 59 are missing from Volvo Penta MD2010 MD2020 MD2030 MD2040 Workshop Manual. I need only these pages at present!