What is a spark plug gapper and why is it important to use one?

A spark plug gapper is a tool used to measure and adjust the gap between the center electrode and the ground electrode of a spark plug. Maintaining the correct gap is crucial for optimal engine performance. An incorrect gap can lead to misfires, reduced fuel efficiency, and even engine damage. By using a gapper, you ensure the spark plug fires correctly, delivering the right amount of energy to ignite the air-fuel mixture.

What are the different types of spark plug gappers available?

There are generally two main types of spark plug gappers: wire-style and coin-style (or ramp-style). Wire-style gappers, like the GearWrench 165, use a series of wires of increasing thickness to find the correct gap. Coin-style gappers, such as the KD Tools 3293, feature a ramp with marked measurements; you insert the spark plug and slide it along the ramp to determine the gap. Some feeler gauge sets, like the GearWrench 164, also include spark plug gapping capabilities. The best choice depends on personal preference and the type of spark plugs you're working with.

How do I determine the correct spark plug gap for my vehicle?

The correct spark plug gap is specified by the vehicle manufacturer and is typically found in the owner's manual or on a sticker under the hood. It's crucial to use the recommended gap for your specific engine. Using the wrong gap can negatively impact engine performance and fuel economy. Always double-check the specification before adjusting the spark plug gap.

How do I use a wire-style spark plug gapper?

To use a wire-style gapper, start by inserting the smallest wire into the spark plug gap. Gradually increase the wire size until you find one that fits snugly with slight resistance. The number on the wire indicates the gap measurement. If the gap is too small or too large, use the adjustment tool (often integrated into the gapper) to carefully bend the ground electrode until the correct wire size fits properly. For example, the GearWrench wire-style gauge also includes the electrode adjusting feature.

How do I use a coin-style (ramp-style) spark plug gapper?

To use a coin-style gapper, insert the spark plug into the slot and slide it along the ramp until it makes contact with both the center and ground electrodes. The marking on the ramp where the spark plug stops indicates the gap measurement. If adjustment is needed, use a separate tool designed for bending spark plug electrodes to achieve the correct gap as indicated on the gauge. Always make small, controlled adjustments to avoid damaging the spark plug.

What is the measurement range I should look for in a spark plug gapper?

The measurement range you need depends on the vehicles you'll be servicing. Most spark plugs fall within a gap range of 0.020 to 0.080 inches. Some gappers, like the GearWrench spark plug gap gauge, offer a range from 0.040 to 0.080 inches, while others, such as the KD Tools 3293, cover a broader range from 0.020 to 0.100 inches. Choose a gapper that encompasses the common gap specifications you'll encounter.

Can I use a feeler gauge set to measure spark plug gap?

Yes, feeler gauge sets can be used to measure spark plug gaps, especially those that include smaller increments. Some sets, like the GearWrench Feeler Gauge & Spark Plug Gap Set, are specifically designed for this purpose and include blades suitable for spark plug gaps. Simply select the blade with the desired thickness and check if it fits snugly between the electrodes. However, feeler gauges typically don't offer an integrated adjustment tool, so you'll need a separate tool for bending the electrodes.

What are the risks of using the wrong tool or method to adjust spark plug gap?

Using the wrong tool or method to adjust spark plug gap can easily damage the spark plug. Avoid using pliers or other tools that can scratch or break the ceramic insulator. Incorrectly bending the electrode can weaken it, leading to premature failure. Always use a dedicated spark plug gapping tool and make small, controlled adjustments to avoid damaging the plug and ensure accurate gapping.

Search

Manufacturers [more]

GearWrench | 164 | Feeler Gauge & Spark Plug Gap Set 0.010 to 0.045 Inch

Name: Feeler Gauge & Spark Plug Gap Set 0.010 to 0.045 Inch
Brand: GearWrench
SKU: 71057
Price: 10.04 USD
Availability: InStock
Rating: 3 (1 reviews)

larger image

Specifications

Manufacturer: GearWrench
Model Number: 164
Product Name: Feeler Gauge & Spark Plug Gap Set
Measurement Range: 0.010 to 0.045 inches
Weight: 0.5 lbs
Dimensions: 5.6 x 5.5 x 0.9 inches

Key Features

Wide Measurement Range: Includes blades from 0.010 to 0.045 inches, covering a variety of automotive specifications and engine clearance requirements.
Durable Steel Construction: Provides lasting resilience and accuracy for consistent, repeated use in demanding workshop environments.
Precision-Ground Blades: Ensures consistent and reliable measurements, crucial for critical engine components.
Integrated Spark Plug Gapper: Offers a convenient, all-in-one solution for quickly checking and adjusting spark plug electrode gaps.
Compact Design: Facilitates easy storage and portability, fitting conveniently into a toolbox or work pouch.

Applications

Setting Spark Plug Gaps: Accurately adjusts spark plug electrode clearances to manufacturer specifications for optimal ignition.
Measuring Valve Clearances: Used to determine and set valve lash, critical for efficient engine performance and longevity.
Checking Piston Ring End Gaps: Verifies appropriate clearances during engine rebuilds or maintenance procedures.
Assessing Bearing Clearances: Measures small gaps in engine bearings and other rotating assemblies for proper fitment.
General Engine Diagnostics: Suitable for various tasks requiring precise small gap measurements in automotive and small engine systems.

Benefits

Optimized Engine Performance: Correctly gapped spark plugs ensure a stronger, more consistent spark, leading to improved combustion efficiency and fuel economy.
Extended Engine Lifespan: Accurate component clearances minimize friction and wear, protecting critical engine parts from premature failure and reducing maintenance costs.
Reduced Engine Misfires: Helps prevent rough idling, hesitation, and power loss by ensuring consistent ignition and smooth engine operation.
Enhanced Accuracy and Reliability: Provides precise measurements essential for maintaining factory specifications and achieving professional-grade results in automotive repair.
Convenient All-in-One Solution: Streamlines maintenance tasks by combining essential feeler gauge and spark plug gapping functions into one efficient tool.

Other products
GearWrench Homepage
Model: 71057
Shipping Weight: 0.5lbs
Manufacturers Part #: 164
Manufactured by: GearWrench
Also Known As: KD164, KDT164, KDT-164, GWR164

Only 1 left in stock - order soon

Inventory available from other suppliers, prices may be different

$10.04

Add to Cart:

Earn 1% Back On Every Purchase (Rewards Program)

We are Here To Help (Contact Us)

3 people have this item in their cart!

Write Review

This product was added to our catalog on Wednesday 07 February, 2007.

Automatic Discount

Special Deal: Purchase the item above and one from below to save!

Old Price:

$54.2300

- $1.61

Your Price:

$52.62

Search

Manufacturers [more]

Categories

GearWrench | 164 | Feeler Gauge & Spark Plug Gap Set 0.010 to 0.045 Inch

Specifications

Key Features

Applications

Benefits

$10.04

Automatic Discount

Special Deal: Purchase the item above and one from below to save!

Related Products

Customers who bought this product also purchased...

Customers Also Shopped For

Customer Service

Popular Manufacturers

Popular Categories