Overview
The Crown Automotive 635641 is a fuel tank sending unit gasket for early Jeep CJ3 and CJ5 models, including Willys CJ-3 and CJ-5 vehicles from 1957–1958.
This gasket is for 4 cylinder engine applications, with years running from 1957 to 1967. Compare it with your original gasket before installing.
Key features
- Fuel tank sending unit gasket
- Notes specify a 4 cylinder engine
- Fitment list covers CJ3, CJ5 and Willys CJ-3 and CJ-5 models
- Crown Automotive part number 635641
Gasket fit on early CJ senders
The sending unit gasket on early CJ models seals the sending unit flange against the tank, so the gasket has to stay flat to keep fuel and vapor in. Because these vehicles are older, the gasket and flange often show decades of heat, fuel exposure and dirt, which can leave a hard or distorted surface. Replacing the gasket during any sending unit service is a practical way to avoid a leak that is hard to find later.
When choosing a gasket for an early CJ, confirm the engine type and the model year range before ordering, since the sending unit fit depends on those details. Clean the flange carefully and check it for bends that could prevent a good seal. Keep ignition sources away from the open tank and work in a ventilated area.
- Scrape old gasket material from the flange carefully
- Check the flange for flatness
- Confirm the engine type before ordering
- Replace the gasket whenever the unit is removed
Specifications
| Brand | Crown Automotive |
|---|---|
| Part number | 635641 |
| UPC | 848399001495 |
| Engine | 4 cylinder engine |
| Type | Sending unit gasket |
Vehicle fitment
The manufacturer fitment list covers the 1959–1960 and 1966 Jeep CJ3 (Base), the 1959–1967 Jeep CJ5 (Base), and the 1957–1958 Willys CJ-3 and CJ-5.
CJ7 and later Jeep vehicles need a separate fit check. Confirm fit for your vehicle’s year, model and trim before ordering.
What’s included
The title names one sending unit gasket. No other parts are listed.
