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Inspection and Repair
Viscous damper inspection
Check the viscous damper for cracks, deformations
or cracks in the mirror plate, leakage of silicone oil,
discolored or peeling paint due to excessive heat. Re-
place it with a new one after 8000 to 12000 hours of
service, even when no defect is observed.
NOTE! Damper may also be sent to authorized Volvo
Penta workshop for inspection.
Measure backlash
Set up a dial gauge so that it contacts with the pitch
circle of the gear to measure the backlash between
the gears. If the dial gauge is not available, measure
the backlash by inserting feeler gauges between the
teeth of the gears. If the backlash exceeds the ser-
vice limit, replace the worn gear.
Backlash,mm [in]
Standard clearance ... 0.12–0.18 [0.0047–0.0071]
Service limit .............. 0.50 [0.0197]
Oil pump drive
Diameters of bearings and bearing-fitted sections
Rotate the bearing, and replace it if it is not smooth.
Check the fittings of following items and replace them
if they show any evidence of excessive wear.
Drive shaft and bearing
●
Drive case and bearing
●
Drive shaft and oil seal
●
Cover bearing bore, mm [in]
Nominal value ........... Ø110 [4.33]
Assembly standard ... 110.000–110.035 [4.33070–4.33208]
Plate bearing bore, mm [in]
Nominal value ........... Ø110 [4.33]
Assembly standard ... 109.987–110.022 [4.33019–4.33157]
Bearing outside diameter, mm [in]
Nominal value ........... Ø110 [4.33]
Assembly standard ... 109.985–110.000 [4.33012–4.33071]
Bearing inside diameter, mm [in]
Nominal value ........... Ø50 [1.97]
Assembly standard ... 49.988–50.000 [1.96803–1.96850]
Gear shaft bearing bore, mm [in]
Nominal value ........... Ø50 [1.97]
Assembly standard ... 49.993–50.013 [1.96822–1.96901]
Group 21 Engine Body
111
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