Bosch 7966 Spark Plug

Bosch 7966 Nickel Spark Plug Overview

Bosch 7966 is a conventional nickel-copper spark plug built for steady ignition performance and value. It uses a heavy-duty yttrium-enhanced nickel center electrode with a copper core, and it is engineered to meet or exceed original equipment specifications for nickel-copper core spark plugs.

Compatible with select Volvo 760 and Volvo 780 applications, Bosch 7966 is a practical choice for drivers servicing the secondary ignition system on older 4-cycle engines. The Bosch Nickel line focuses on dependable OE-style construction for routine maintenance.

Key Features

• Part number: 7966
• Conventional nickel-copper spark plug design
• Yttrium-enhanced nickel center electrode with copper core
• Resistor spark plug with 6000 resistance
• Pre-gapped at .8
• Tapered V-profile ground electrode tip
• Standard ground configuration with 1 ground electrode
• Ceramic insulator and non-projected insulator type
• 16 mm hex size, 17.5 reach, tapered seat
• Removable nut terminal

Detailed Description

Bosch 7966 is a nickel-copper spark plug designed for consistent ignition service in compatible Volvo applications. The copper core helps carry heat away from the center electrode, while the yttrium-enhanced nickel construction supports longer service life than a basic copper-core plug. Its resistor design helps control electrical noise in the ignition system, and the tapered V-profile ground electrode supports stable spark delivery.

This Bosch Nickel spark plug is a direct maintenance part for 1983-1990 Volvo 760 and 1987-1990 Volvo 780 models. Use Bosch 7966 when replacing worn plugs in these Volvo 760 and Volvo 780 applications and when servicing a 4-cycle ignition system that calls for a tapered-seat, 16 mm plug with .8 pre-gap.

Common Issues This Part Helps Address

• Hard starting caused by worn or fouled spark plugs
• Rough idle from weak or inconsistent spark output
• Misfire conditions related to aged secondary ignition components
• Reduced throttle response from degraded plug performance
• Ignition noise concerns in resistor-equipped systems

Installation Notes and Tips

Verify the vehicle calls for a tapered-seat spark plug with a 16 mm hex and 17.5 reach before installation. Check the plug gap against the engine specification even though Bosch 7966 is pre-gapped at .8, and inspect ignition wires, distributor components, and coil condition during service. For Volvo 760 and Volvo 780 maintenance, replace plugs as a complete set to keep ignition performance consistent across cylinders.

Quality Assurance

Bosch engineers this Nickel line to meet or exceed OE specifications for nickel-copper core spark plugs. Part number 7966 is built as a conventional replacement spark plug for dependable service in the listed Volvo applications.