Engine body
Grinding of the crankshaft
Inspection of front crankshaft bushing
To achieve satisfactory results in connection with grind-
ing the following factors should be taken into considera-
tion:
Check the bearing clearance between the big-end jour-
nal and bushing. Use a cylinder indicator and a micro-
meter.
1.
Grind the crankshaft in a crankshaft grinding ma-
chine to the undersize as per "Technical data". Sur-
face fineness 1.6 Z (
) for bearing races
(B, Fig. 73) and recess radius are achieved by rub-
bing with emery cloth No. 400.
Fig. 74. Checking of bearing clearance
1.
Measure the bushing�s inner diameter at points 1
and 2 as per Fig. 72 on page 46. Measure in two
directions ("A" and "B") at each point.
Fig. 73. Checking of recess radius
2.
Measure the bearing journal�s outer diameter and
calculate the bearing clearance (difference be-
tween the previous measurement and the bearing
journal�s max. diameter).
2.
It is very important that the recess radius is the cor-
rect size.
Recess radius:
Max. bearing clearance: 0.2 mm (.0078 in).
-
At main and big-end bearing journals,
"A" = 3 ± 0.25 mm (.1181 ±.0098 in)
Replace the bushing if the clearance exceeds the per-
missible value. Where necessary the crankshaft can be
ground to an appropriate undersize and the bushing
can be replaced with a corresponding oversize.
-
At oil holes, "C" = min. 2 mm (.0787 in),
max. 5 mm (.1968 in).
Grinding hacks and sharp edges must be avoided
since these can give rise to crankshaft fracture.
Note: Check the bearing clearance again before the
crankshaft is fitted if it has been re-ground.
3.
Clean the crankshaft well from grinding residue and
other impurities. Flush and clean the oil channels.
Inspection of main and big-end bearings
Check the main and big-end bearing cups and the front
crankshaft busing. Replace worn bearings or those with
damaged bearing surfaces.
47
| Categories | Volvo Penta Manuals |
|---|---|
| Tags | Volvo Penta MD2010, Volvo Penta MD2020, Volvo Penta MD2030, Volvo Penta MD2040 |
| Download File |
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| Copyright | Attribution Non-commercial |
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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!