Overview
The Crown Automotive 56027275 is a Jeep spark plug sold under part number 56027275. The manufacturer fitment list covers 1986 to 1998 Cherokee XJ, 1986 to 1992 Comanche, 1993 Grand Cherokee ZJ, 1986 to 1987 Wagoneer SJ, 1997 to 1998 Wrangler TJ (SE) and 1987 to 1995 Wrangler YJ.
Confirm the heat range, thread size and electrode design against your engine’s specification before installing a replacement.
Key features
- Replacement spark plug for several Jeep generations within the 1986–1998 range
- Manufacturer part number 56027275 and UPC 848399022476
- Fitment includes Cherokee XJ, Comanche, Grand Cherokee ZJ, Wagoneer SJ, and Wrangler TJ and YJ
- The Wrangler TJ entry is limited to SE trim
Matching the plug to your engine
A spark plug has to match the engine’s heat range, seat type and thread size, and those details decide how the plug runs under load. A plug that runs too cool can foul with deposits at idle, while one that runs too hot can pre-ignite under sustained throttle. Matching the original design is the safest route for an older Jeep engine, so comparing the old plug’s markings with the new one is worth the few minutes it takes.
Before buying, pull one of the existing plugs and read the electrode. Light tan or grey deposits usually reflect steady running, while black sooty tips point to a rich mixture. Oily, wet deposits can mean worn rings or valve guides. Those symptoms often call for a check of the air filter, fuel system or ignition wires before the new plug goes in.
- Note the old plug’s markings before removal
- Check the gap with a wire gauge before installing
- Hand start the plug to avoid cross threading
- Replace ignition wires that show cracks or carbon tracking
Specifications
| Brand | Crown Automotive |
|---|---|
| Part number | 56027275 |
| UPC | 848399022476 |
| Plug type | Confirm against original plug |
| Fitment years | 1986–1998 |
Vehicle fitment
It fits these Jeep vehicles: 1986–1998 Cherokee XJ; 1986–1992 Comanche; 1993 Grand Cherokee ZJ; 1986–1987 Wagoneer SJ; 1997–1998 Wrangler TJ (SE trim only); and 1987–1995 Wrangler YJ.
Other Grand Cherokee generations such as WJ and WK, and Wrangler JK and later models, are not on this list. Confirm your vehicle’s year, model and trim before ordering.
What’s included
One spark plug, part number 56027275, as named in the product title.
