1999 Volvo Penta "WT" Models Workshop Manual, Page 138Get this manual
6Crankshaft balancer bolt and washer Tighten:
Bolt to 74 ftlb(100 Nm)
Oil Pan _
Removal
Remove or Disconnect:
1Oil pan nuts2Oil pan bolts3Oil pan4Gasket
Parts ir solventRemove all sludge and varnish Old gaskets and sealant from the gasket surfaces10mm [0.3931N.1
Inspect:
Gasket flanges for bending or damage Oil pan for damage or cracks Oil pan deflector for lack of fit Drain plug threads for strippingInstallation