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Crankshaft oil seal leaks on older cruising engines — specifically the Perkins 4107 and Perkins 4108 and engines using the same block under different labels — are the focus of this exchange between Jan Attenstedt and Nigel Calder.0:25 Calder explains that both the front and rear crankshaft seals on these engines are prone to leaking over time, while most modern engines rarely develop the same problem.0:42 Replacing either seal requires significant disassembly: the rear seal demands pulling the transmission, and the front seal requires removing the crankshaft pulley, with further teardown depending on how the housing is configured.1:03 Because the procedure varies too much between engine types to give a generic answer, Calder's firm recommendation is to obtain the workshop manual for the specific engine before attempting the job.1:16 No step-by-step repair sequence is demonstrated; the exchange is diagnostic and advisory.

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