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What is an Engine Spacer Plate?

At its core, an engine spacer plate is a precision-machined piece of material, typically aluminum or steel, that is designed to be installed between two major components in the drivetrain. Most commonly, it's found between:

  • The engine block and the transmission bell housing: This is where they earn their "engine spacer" moniker, as they literally create space between these two crucial parts.
  • Other mounting points: In some custom applications, they might be used to space out other components like superchargers, alternators, or even body mounts.

One of the most popular plates are 6I4421,7N8021,7N7998, 2603904, 1106994 and others. All of them are used in different engines, you can find this info at our website.

Click here to check Ucaslar’s best engine spacer plates.

Their thickness can vary from a few millimeters to several centimeters, depending on the specific application and the amount of spacing required.

Alüminyum ve Bronz Dişliler: İş Makina Yedek Parça Seçiminde Güçlü ve Dayanıklı Çözümler

Why Do You Need an Engine Spacer Plate?

The need for an engine spacer plate usually arises when you're trying to fit components that weren't originally designed to work together directly. Here are the most common reasons:

  1. Transmission Swaps & Adapters: This is perhaps the most frequent use case. If you're swapping a different transmission into a vehicle, or using an adapter plate to mate a non-original transmission to your engine, you might find that the input shaft of the transmission doesn't quite reach the crankshaft pilot bearing, or that the bell housing fouls on the engine block. A spacer plate remedies this by pushing the transmission further back, ensuring proper engagement and preventing damage.
  2. Crankshaft-to-Torque Converter/Clutch Alignment: In automatic transmissions, the torque converter needs to sit correctly within the bell housing and engage with the flexplate on the engine. For manual transmissions, the clutch disc and pressure plate need precise alignment. A spacer plate helps maintain this critical alignment, preventing premature wear on bearings and input shafts.
  3. Flywheel/Flexplate Clearance: Sometimes, after installing a new flywheel or flexplate (especially aftermarket or performance-oriented ones), you might encounter clearance issues with the starter motor or other components. A thin spacer plate can often provide just enough extra room.
  4. Component Relocation (Less Common for Engine Spacers): While not the primary function of an engine spacer plate, the concept of spacing is also used in other areas of custom builds to move components for clearance or routing purposes.

Key Considerations When Using an Engine Spacer Plate:

  • Precision is Paramount: This isn't a DIY hack with washers. Engine spacer plates are precisely machined to maintain perfect alignment of the crankshaft and transmission input shaft. Any misalignment can lead to severe damage to bearings, seals, and the transmission itself.
  • Material Strength: Given the forces involved, the material of the spacer plate must be robust enough to withstand constant vibrations and torque.
  • Hardware Length: When adding a spacer, you'll almost certainly need longer bolts to ensure proper thread engagement and secure fastening of the engine and transmission. This is a critical detail that must not be overlooked.
  • Pilot Bearing Extension: In some cases, if the transmission input shaft becomes too short relative to the crankshaft, you might also need an extended pilot bearing to maintain proper support.
  • Professional Installation: Due to the critical nature of these components and the precision required, installation of an engine spacer plate (especially in a transmission application) is best left to experienced mechanics or performance shops.

Find more info here!

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