The engine shaft size specification for 1989 to 1993 EZGO golf carts is an important detail for maintenance, repair service, and adjustment, especially concerning the starter/generator or clutch installation. However, a crucial first difference has to be made: EZGO produced both electric and gasoline-powered designs during this duration. Electric models use an electric motor, not an internal combustion engine, and as a result do not have an “engine shaft” in the context implied by the query. This write-up specifically addresses the gasoline-powered models, which were prevalent during these years.
(what size is the engine shaft on an 1989 to 93 ezgo golf cart)
The gasoline-powered EZGO Marathon models from 1989 to 1993 mainly used engines produced by Robin (a division of Fuji Heavy Industries, currently Subaru). The most typical engines were the 2-stroke, 2-cylinder Robin EH29C (244cc) and Robin EH35C (350cc). The shaft in question is the Power Take-Off (PTO) end of the engine’s crankshaft. This is the shaft that extends from the engine block, usually on the clutch side (opposite the fan shroud), and directly interfaces with the drive clutch assembly and the starter/generator pulley through a drive belt.
With assessment of initial tools manufacturer (OEM) service handbooks, parts diagrams, and validated replacement part specifications for these details Robin EH29C and EH35C engines installed in 1989-1993 EZGO Marathon golf carts, the basic crankshaft PTO shaft dimension is continually recorded as follows:
1. Shaft Size: 1 inch (25.4 mm).
2. Shaft Taper: None. The shaft is straight (parallel) along its size where the drive clutch places.
3. Keyway: The shaft includes a common Woodruff keyway. The crucial dimensions are normally 1/4 inch large by 1/8 inch high (6.35 mm x 3.175 mm). The keyway length is sufficient to accommodate the complete width of the drive clutch center.
4. Shaft End: The end of the crankshaft is threaded. The typical string size is 1/4-20 UNF (Unified National Penalty). This string is used to safeguard the drive clutch to the crankshaft using a big washing machine and a 1/4-20 UNF hex nut, torqued to specification. Some very early manufacturing within this range might have made use of a various thread (like 5/16-24), however the overwhelming proof and parts compatibility point to 1/4-20 UNF as conventional for the vast majority of 1989-1993 designs.
5. Shaft Size: The exposed length of the crankshaft from the engine block face throughout of the strings is approximately 2.5 to 3 inches (63.5 mm to 76.2 mm), supplying ample interaction for the drive clutch center and the keeping nut.
Value of Shaft Dimension: .
Knowing this exact dimension is paramount for a number of factors:.
Clutch Compatibility: The bore of the drive clutch (key clutch) have to match this 1-inch size with the equivalent keyway. Installing a wrong clutch birthed dimension will bring about failing, too much wear, or inability to install the clutch.
Starter/Generator Positioning: While the starter/generator installs individually, its pulley must straighten appropriately with the clutch pulley for correct belt monitoring and stress. The crankshaft shaft setting is the fixed reference factor.
Component Substitute: When sourcing replacement clutches, crankshaft seals, or perhaps whole engines (or engine rebuild kits), verifying compatibility with this 1-inch straight shaft and 1/4-20 threaded end is important.
Aftermarket Upgrades: Performance clutch makers make their products especially for this crankshaft requirements common to these EZGO/Robin models.
Vital Considerations: .
Confirmation: While the 1-inch straight shaft with 1/4-20 thread is the basic and predicted requirements, it is always prudent practice to physically validate the crankshaft measurements on the particular device being dealt with prior to purchasing replacement parts. Use calipers to determine the shaft size and examine the threads and keyway.
Electric Designs: Restating, electrical EZGO carts from 1989-1993 do not have this engine shaft. They have an electric motor shaft, which is a different element with its own specifications.
Later Models: Post-1993 EZGO gasoline designs undertook substantial changes, including the intro of 4-stroke engines (at first Robin, after that later Briggs & Stratton and Subaru), featuring various crankshaft layouts and shaft dimensions.
Final thought: .
(what size is the engine shaft on an 1989 to 93 ezgo golf cart)
For the gasoline-powered 1989 to 1993 EZGO Marathon golf carts furnished with the Robin EH29C or EH35C 2-stroke engine, the crankshaft PTO shaft size is definitively 1 inch (25.4 mm) in size, straight (non-tapered), featuring a typical Woodruff keyway and ending in a 1/4-20 UNF threaded end. This requirements is fundamental for making sure right element fitment, drive system stability, and reputable procedure throughout maintenance or upgrades. Constantly verify measurements on the certain system before significant element acquisitions.