Considering repowering your Perkins 4.108 with something more modern? Maybe even a Yanmar or a Volvo? Most people like their 4.108 for its quiet running, and rugged construction, but there are a couple of nagging issues with the 4.108 that make a new, more modern engine an attractive option worth considering. An attractive option, that is until you hear the cost for the engine plus the cost of changing the motor mounts, re-routing the exhaust and the overall labor charge to install the engine.
So, we came up with a special version of the Perkins 4108 engine, called Not Your Father’s 4108 that incorporated a package of significant upgrades designed to propel the 4108 into the 21st century. These upgrades included a serpentine belt system, a more powerful alternator, and our proprietary rear seal to stop the chronic leaks, and a spin-on secondary fuel filter. Today, as parts availability for this engine has started to have some challenges we can no longer provide the Not Your Father’s 4.108, but we still are able to provide the improvement, engine cores, take-off parts and, as of April, 2026 our last 4.108 rebuilt long-block now that our favorite 4.108 marine rebuilder has retired.
The Not Your Father’s 4108 included the following innovative features to help bring it up to present-day standards:
1) Full serpentine belt system with Rockwell-hardened pulleys.
2) Spin on fuel filter to replace the hard-to-bleed, cartridge-style secondary fuel filter
3) A 105 amp alternator to replace the weak 37 amp alternator
4) Our special improved rear crankshaft seal to cure the chronic rear seal leaking problems
While the Not Your Father’s 4.108 program is retiring, we will not stop supporting this engine with gaskets, fuel injectors, fuel injection pumps, alternators, water pumps, and the upgrades like the serpentine pulleys to help the community.
