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Powerbuilt Piston Ring Compressor Tool Set for Car Engine, Vehicle Maintenance Clamps, Ratchet Pliers, Storage Case - 940387

4.5 out of 5 stars 911 ratings
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Purchase options and add-ons

Brand Alltrade
Recommended Uses For Product car engine
Power Source hand_powered
Special Feature Heavy Duty
Included Components Piston Ring Compressor Kit69

About this item

  • Heavy duty pliers offer strength and leverage for easy band compression
  • Band sizes include: 2-7/8" thru 3-1/8", 3-1/8" thru 3-3/8", 3-3/8" thru 3-5/8", 3-5/8" thru 3-7/8", 3-7/8" thru 4-1/8" 4-1/8" thru 4-3/8"
  • Storage case complete with usage instructions and photos
  • Meets or exceeds ANSI standards
  • EASY TO READ: Includes detailed instruction with usage photos
  • Tool set for compressing piston rings fro cylinder installation
  • Band sizes by-Inches include: 2-7/8-Inch thru 3-1/8-Inch , 3-1/8-Inch thru 3-3/8-Inch, 3-3/8-Inch thru 3-5/8-Inch, 3-5/8-Inch thru 3-7/8-Inch, 3-7/8-Inch thru 4-1/8-Inch and 4-1/8-Inch thru 4-3/8-Inch
› See more product details
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Powerbuilt Piston Ring Compressor Tool Set for Car Engine, Vehicle Maintenance Clamps, Ratchet Pliers, Storage Case - 940387
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Sold by Toolsmithdirect and ships from Amazon Fulfillment.
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    Featuring professional quality hand tools, lift equipment, and specialty tools.

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  4. For decades, Powerbuilt has been providing automotive professionals and enthusiasts with high-quality tools and equipment that stand out for their superior performance, innovation, and durability. Our commitment to excellence has earned us the trust of tool users who appreciate consistent quality, value, and reliability. We take pride in our hard work to ensure that our tools are not only functional but also long-lasting and visually appealing.

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    Powerbuilt tools deliver high performance at affordable prices. Our in-house R&D team is dedicated to design, materials, and precision, using cutting-edge tech to accelerate development..

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From the manufacturer

powerbuilt

Powerbuilt Piston Ring Compressor Kit

Keep piston rings in place during reassembly with this piston ring compressor kit. Innovative piston ring bands can be tightened to fit any piston from 2-7/8” (73mm) to 4-3/8” (111mm) in diameter.

Just attach the ratcheting pliers to the band and compress in small increments until the proper size is reached. The band will hold the rings securely until the piston is reinstalled. Instructions are permanently fastened to the inside of the heavy duty storage case.

Kit Services: engines with piston diameters from 2-7/8” (73mm) to 4-3/8” (111mm)

  • Set includes 2-7/8” through 3-1/8” (73mm through 79mm); 3-1/8” through 3-3/8” (79mm through 86mm); 3-3/8” through 3-5/8” (86mm through 92mm); 3-5/8” through 3-7/8” (92mm through 98mm); 3-7/8” through 4-1/8” (98mm through 105mm); 4-1/8” through 4-3/8” (105mm through 111mm); ratchet pliers; storage case

powerbuilt

Set includes

  • 2-7/8” through 3-1/8” (73mm through 79mm)
  • 3-1/8” through 3-3/8” (79mm through 86mm)
  • 3-3/8” through 3-5/8” (86mm through 92mm)
  • 3-5/8” through 3-7/8” (92mm through 98mm)
  • 3-7/8” through 4-1/8” (98mm through 105mm)
  • 4-1/8” through 4-3/8” (105mm through 111mm)
  • Ratchet pliers
  • Storage case

powerbuilt

powerbuilt

powerbuilt

Product information

Technical Details

Brand ‎Alltrade
Recommended Uses For Product ‎car engine
Power Source ‎hand_powered
Special Feature ‎Heavy Duty
Included Components ‎Piston Ring Compressor Kit69
Item Weight ‎3.6 Pounds
Color ‎Silver
Material ‎Alloy Steel, Iron
Product Dimensions ‎2.75"L x 12.75"W x 10.12"H
Model Name ‎Piston Ring Compressor Kit69
Manufacturer ‎Alltrade Tools
UPC ‎028907313528
Global Trade Identification Number ‎00028907313528
Style ‎Tool Set
Part Number ‎940387
Item Weight ‎3.59 pounds
Item model number ‎940387
Item Package Quantity ‎1
Head Style ‎Philips
Measurement System ‎Metric
Special Features ‎Heavy Duty
Usage ‎Professional
Batteries Included? ‎No
Batteries Required? ‎No

Additional Information

ASIN B0028QGTP4
Customer Reviews
4.5 out of 5 stars 911 ratings

4.5 out of 5 stars
Best Sellers Rank #219,800 in Automotive (See Top 100 in Automotive)
#56 in Automotive Replacement Engine Piston Rings
Date First Available May 20, 2009

Warranty & Support

Amazon.com Return Policy:Amazon.com Voluntary 30-Day Return Guarantee: You can return many items you have purchased within 30 days following delivery of the item to you. Our Voluntary 30-Day Return Guarantee does not affect your legal right of withdrawal in any way. You can find out more about the exceptions and conditions here.
Product Warranty: For warranty information about this product, please click here

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Product Description

Product Description

Alltrade Tools LLC is a global leader in the design, manufacturing and marketing of innovative products for home, garage and worksite. Founded in 1979, Alltrade is privately Held and maintains global sourcing, research, assembly and sales facilities to serve customers on every continent.

From the Manufacturer

Each kit includes step-by-step usage instructions and photos showing the tool in use. Instruction sheets are laminated to resist staining and are permanently fastened to the case. All instructions are developed by a professional repair manual writer. Kit 69 tool set is for compressing piston rings for cylinder installation. The set includes six band sizes for multiple applications.

Customer reviews

4.5 out of 5 stars
911 global ratings

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Customers say

Customers find the air compressor works well, particularly for twin cam piston jobs, and appreciate its ease of use and ability to handle various piston sizes. The quality and value for money receive mixed reviews - while some find it strong and good value, others consider it poorly made and not worth the price. The compression rate also gets mixed feedback, with several customers reporting that it doesn't compress properly.

AI-generated from the text of customer reviews

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75 customers mention "Works well"66 positive9 negative

Customers find that the compressor works well, particularly for twin cam piston jobs and Harley installations.

"Great product, well made and easy to use, highly recommended." Read more

"Great idea , and if manufacturing quality was there it would be a better product, hoops are not round...." Read more

"...This tool is functional, but I wish the workmanship was better out of the box...." Read more

"This is a great product.It worked very well ." Read more

17 customers mention "Ease of use"13 positive4 negative

Customers find the air compressor easy to use, with one mentioning it makes the job quicker and another noting it's perfect for installing rings.

"Great product, well made and easy to use, highly recommended." Read more

"The tool is easy to use. This can be used for a variety of different piston sizes." Read more

"...did, the locking pliers actually worked unlike others which was very convenient...." Read more

"...ring installers before and this by far is 1000 times better and really easy to use. Took a lot less time to install the pistons with it" Read more

14 customers mention "Piston size"10 positive4 negative

Customers appreciate the compressor's ability to handle various piston sizes, with one mentioning it works well even with oily hands.

"Lots of sizes works great with oily hands." Read more

"...There are multiple sized bands for larger or smaller pistons, and the plier style ratchet makes compressing the rings and holding the compressor in..." Read more

"The tool is easy to use. This can be used for a variety of different piston sizes." Read more

"...Larger size ring was too big to clamp rings to fit cylinder. We bought this kit to speed up install. We spent more time trying to make it work...." Read more

41 customers mention "Quality"25 positive16 negative

Customers have mixed opinions about the compressor's quality, with some finding it strong and well-made, while others report it being poorly constructed.

"Great product, well made and easy to use, highly recommended." Read more

"...Looking through the included bands, it's very clear the quality control is just not there...." Read more

"...I was surprised how well it worked. The bands were like a spring steel and put a decent tension on the rings before completely compressing with..." Read more

"...The thick metal bands won’t lose their form...." Read more

27 customers mention "Value for money"17 positive10 negative

Customers have mixed opinions about the air compressor's value for money, with some finding it good quality for the price while others consider it completely worthless.

"Great product for the price" Read more

"...Poor execution, good idea." Read more

"...This specific product worked really well for me, and I would recommend for the price...." Read more

"Quality tool for the price" Read more

7 customers mention "Compression rate"3 positive4 negative

Customers have mixed experiences with the compressor's performance, with some reporting that it doesn't compress properly, and one customer noting that the rings are too close together.

"...see these would work for light duty rings but not suited for compressing diesel engine piston rings...." Read more

"Nice set of ring compressors without breaking the bank" Read more

"...Does not compress evenly. I literally threw this set away." Read more

"Best style of compressor..." Read more

Works Remarkably Well
4 out of 5 stars
Works Remarkably Well
As a professional engine builder, I needed these in a pinch. I was surprised how well it worked. The bands were like a spring steel and put a decent tension on the rings before completely compressing with the ratcheting tool.
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Top reviews from the United States

  • david de leeuw
    5.0 out of 5 stars Great Value
    Reviewed in the United States on May 9, 2024
    Style: Tool SetVerified Purchase
    Great product, well made and easy to use, highly recommended.
    Helpful
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  • Cory Bushnell
    5.0 out of 5 stars Works great
    Reviewed in the United States on September 1, 2024
    Style: Tool SetVerified Purchase
    Did 6.0 PowerStroke pistons. Did fine
    Helpful
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  • Corvette 77
    5.0 out of 5 stars Nice set at budget pricing
    Reviewed in the United States on March 7, 2024
    Style: Tool SetVerified Purchase
    Nice set of ring compressors without breaking the bank
    Helpful
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  • ROKKET
    4.0 out of 5 stars Works Remarkably Well
    Reviewed in the United States on March 17, 2025
    Style: Tool SetVerified Purchase
    As a professional engine builder, I needed these in a pinch. I was surprised how well it worked. The bands were like a spring steel and put a decent tension on the rings before completely compressing with the ratcheting tool.
    Customer image
    ROKKET
    4.0 out of 5 stars
    Works Remarkably Well

    Reviewed in the United States on March 17, 2025
    As a professional engine builder, I needed these in a pinch. I was surprised how well it worked. The bands were like a spring steel and put a decent tension on the rings before completely compressing with the ratcheting tool.
    Images in this review
    Customer image
    Helpful
     Report
  • J
    5.0 out of 5 stars Correct part, arrived promptly, reasonable quality
    Reviewed in the United States on March 11, 2021
    Style: Tool SetVerified Purchase
    Correct part, arrived promptly, they seem to be better than most of the off shore units.
    I Used this ring compressor to install piston rings and cylinders on ‘07 Buell XB12 (which is the same as a H-D Sportster motor, pretty much any V-Twin). For me to install the cylinders, I cannot use the 10-1/2” long handle / pliers, with the spring loaded ratchet (they never seem to ratchet to the proper tension (they are twitcher than a squirrel on meth, and will pop open with the slightest bump of the release). I use a long #8 screw placed through the holes in both prongs (one at each end of the band) I put a nut on the end of the screw (making sure not to drop the nut or screw in the crankcase) and then tighten the screw to compress the band around the piston (I know they make ring compressors that works like a hose clamp, but they are to wide ect…). Some of the prongs that the handles / pliers connect to protrude below the band, and the spot welds could be smoother, but I believe this is true of almost all, if not all of this type compressor.
    So basically all I use are the bands, the handle / pliers are useless to me.
    If you do use the handle / pliers, I have included photos (K-D on the right) of an older US made K-D unit, they are very similar, but the US made K-Ds have a much finer toothed ratchet. I just noticed the some of the fine teeth on the K-D are rounded off and won’t hold, confirming my low opinion of the ratcheting feature of this type ring compressor.
    Customer image
    J
    5.0 out of 5 stars
    Correct part, arrived promptly, reasonable quality

    Reviewed in the United States on March 11, 2021
    Correct part, arrived promptly, they seem to be better than most of the off shore units.
    I Used this ring compressor to install piston rings and cylinders on ‘07 Buell XB12 (which is the same as a H-D Sportster motor, pretty much any V-Twin). For me to install the cylinders, I cannot use the 10-1/2” long handle / pliers, with the spring loaded ratchet (they never seem to ratchet to the proper tension (they are twitcher than a squirrel on meth, and will pop open with the slightest bump of the release). I use a long #8 screw placed through the holes in both prongs (one at each end of the band) I put a nut on the end of the screw (making sure not to drop the nut or screw in the crankcase) and then tighten the screw to compress the band around the piston (I know they make ring compressors that works like a hose clamp, but they are to wide ect…). Some of the prongs that the handles / pliers connect to protrude below the band, and the spot welds could be smoother, but I believe this is true of almost all, if not all of this type compressor.
    So basically all I use are the bands, the handle / pliers are useless to me.
    If you do use the handle / pliers, I have included photos (K-D on the right) of an older US made K-D unit, they are very similar, but the US made K-Ds have a much finer toothed ratchet. I just noticed the some of the fine teeth on the K-D are rounded off and won’t hold, confirming my low opinion of the ratcheting feature of this type ring compressor.
    Images in this review
    Customer imageCustomer imageCustomer imageCustomer imageCustomer image
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  • Gino B
    5.0 out of 5 stars Worked well
    Reviewed in the United States on December 26, 2024
    Style: Tool SetVerified Purchase
    Lots of sizes works great with oily hands.
    Helpful
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  • TSG
    3.0 out of 5 stars Acceptable, but barely.
    Reviewed in the United States on August 9, 2021
    Style: Tool SetVerified Purchase
    The reviews of this product are all over the map - some people who had great results and some people who had poor... I had a poor result. I suspect a lot has to do with the specific set you received and what your application was. Looking through the included bands, it's very clear the quality control is just not there. Each band has a foot which where the pliers attach, and those feet are literally randomly placed. None are square in the middle of the band - some are closer to one edge, some the other, some feet even overhang the band. The result of this insane lack of QC is that the pliers often cannot grip the band squarely and instead squeeze it into a cone shape; it's so bad some bands can only be used facing one direction. Also, the spring that opens the pliers is incredibly weak, and the ratchet teeth are widely spaced meaning you go from "not enough" to "too much" grip immediately. I got the job done without any real problems, but using these is an exercise in frustration. If you're just going to use these a few times the low price probably justifies the annoyances, but if you're building a V12 or plan to use these daily, I would find a higher quality tool. These are were barely adequate for one four cylinder motor as far as I'm concerned.
    9 people found this helpful
    Helpful
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  • Joe R.
    5.0 out of 5 stars Good quality
    Reviewed in the United States on October 22, 2024
    Style: Tool SetVerified Purchase
    Great product for the price
    Helpful
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Top reviews from other countries

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  • Fernando Toniazzo
    5.0 out of 5 stars Muito bom!
    Reviewed in Brazil on January 9, 2022
    Style: Tool SetVerified Purchase
    Muito bom!! Só é melhor tirar a tinta da parte interna
    Report
  • James
    5.0 out of 5 stars Ring compressor
    Reviewed in Australia on August 26, 2024
    Style: Tool SetVerified Purchase
    Nice kit, good price, quick delivery
    Report
  • faris
    2.0 out of 5 stars لايتناسب مع محركات ٦.٢ ls
    Reviewed in Saudi Arabia on August 7, 2023
    Style: Tool SetVerified Purchase
    لايتناسب مع محركات ٦.٢ ls و السعر مرتفع
    Report
  • rupzuk
    5.0 out of 5 stars Good tool, works great
    Reviewed in Canada on February 23, 2021
    Style: Tool SetVerified Purchase
    Used this on my Harley twin cam, worked great, easy to get the band out after use. I was able to do the job by myself without concern. Quality looks good and I think it will last longer than me (as long as I don’t lend it out...) I’m very happy with it.
    Report
  • James
    5.0 out of 5 stars Works the first time every time
    Reviewed in Canada on June 7, 2019
    Style: Tool SetVerified Purchase
    Works awesome, worked first try every time for me. No messing around fighting with it. I used lots of assembly lube, and was able to push the pistons in by hand

    Con: the box has the label on the bottom! So definitely still gets 5 stars

    Update: Tried it vs blue line or whatever Snap-On's brand is. I like this one better! The other one was the worm gear style clamp, and the upper compression ring kept slipping past it and getting caught at the top of the block. Not an issue with this one if you hold the tool from the band, not the pliers. I'm not a pro, but both race engines I've built now are happily performing, and I even pulled the pistons on one and found that the rings held well in place while going in.
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Product Summary: Powerbuilt Piston Ring Compressor Tool Set for Car Engine, Vehicle Maintenance Clamps, Ratchet Pliers, Storage Case - 940387

From Alltrade

4.5 out of 5 stars, 911 ratings

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50+ bought in past month

Price

One-time purchase: $84.97 5% Savings

List Price: $88.99

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About this Item

  • Heavy duty pliers offer strength and leverage for easy band compression
  • Band sizes include: 2-7/8" thru 3-1/8", 3-1/8" thru 3-3/8", 3-3/8" thru 3-5/8", 3-5/8" thru 3-7/8", 3-7/8" thru 4-1/8" 4-1/8" thru 4-3/8"
  • Storage case complete with usage instructions and photos
  • Meets or exceeds ANSI standards
  • EASY TO READ: Includes detailed instruction with usage photos
  • Tool set for compressing piston rings fro cylinder installation
  • Band sizes by-Inches include: 2-7/8-Inch thru 3-1/8-Inch , 3-1/8-Inch thru 3-3/8-Inch, 3-3/8-Inch thru 3-5/8-Inch, 3-5/8-Inch thru 3-7/8-Inch, 3-7/8-Inch thru 4-1/8-Inch and 4-1/8-Inch thru 4-3/8-Inch
  • Band sizes by millimeters include: 73mm thru 79mm, 79mm thru 86mm, 86mm thru 92mm, 92mm thru 98mm, 98mm thru 105mm and 105mm thru 111mm
  • Storage case includes usage photos
  • Kit 69 includes 7-Piece for compressing the piston ring for cylinder installation

Product Description

Product Description
Alltrade Tools LLC is a global leader in the design, manufacturing and marketing of innovative products for home, garage and worksite. Founded in 1979, Alltrade is privately Held and maintains global sourcing, research, assembly and sales facilities to serve customers on every continent.
From the Manufacturer
Each kit includes step-by-step usage instructions and photos showing the tool in use. Instruction sheets are laminated to resist staining and are permanently fastened to the case. All instructions are developed by a professional repair manual writer. Kit 69 tool set is for compressing piston rings for cylinder installation. The set includes six band sizes for multiple applications.

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Important Information

Proposition 65 Warning for California Consumers

WARNING: This product can expose you to chemicals including Lead which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov

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