Perkins 4 Alternator - parts4engines Product Description. These 12 volt 70 amp alternators fit all versions (including marine) of Perkins 4.236 engines set up for a 'three lug' mounted alternator adjuster arm securing bolt is at a 120 degree angle to the mounting arms as can be seen from the photos and diagram and note that the mounting bolt is on the right or left (see photos). Perkins 4 Workshop Manual - l-36 Perkins 4.236 Workshop Manual. Note: This is the new page for displaying documents. It allows documents to display on devices without pdf viewers specifically mobile devices, a new Google requirement. Note also that some documents have blank pages. Just click on "Next Page" if TAD for Perkins 4 Diesel Engines, Perkins 4 Diesel If ever an engine deserved the name "Workhorse" it’s this one. It’s excellent reputation around the world for reliability, durability, and simplicity makes this engine a favorite amongst serious boaters. There are high volumes of the 4.236 engines in use throughout the world, not only in the marine environment.