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Perkins diesel engines, particularly the 4108, remain common in sailboats from the 1960s through the 1990s due to their rugged, overbuilt design and global parts availability.▶ 5:45 While legendary for reliability, the 4108 frequently suffers from rear crankshaft seal oil leaks and high-pressure fuel pump failures, which can lead to dangerous diesel runaways.▶ 6:42 Owners often mitigate starting issues by installing a dedicated start battery with shorter cables.▶ 6:49 Air ingress into fuel lines and return hoses frequently causes RPM instability and rough idling, requiring regular inspection and replacement of seals.▶ 7:31 When the 4108 reaches the end of its service life, owners often choose to repower with Beta Marine or Nanni Diesel engines, which frequently offer compatible mounts and footprints.▶ 8:42 Compared to Yanmar engines, Perkins units are heavier, louder, and vibrate more, but they feature simpler mechanical fuel systems that are better suited for DIY maintenance and rebuilding.▶ 9:51

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