Step-by-Step: How to Use the M52050 Counterbore Tool to Salvage CAT / Cummins Blocks from Counterbore Damage

Cracked counterbores mean scrapped blocks — until now. The M52050 bores out damage, installs repair bushings, and finishes new ledges. This PT-2050-D equivalent has a removable handle for tight bays. Follow this guide to save your next block.

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Step 1: Prep the Block

Clean block face. Inspect counterbore for cracks. Mount M52050 to block with hold-downs.

Step 2: Set Depth & Install Bit

Use micrometer block to set depth. Install PT-2000-109 bit. Align with damaged ledge.

Step 3: Bore Out Damage

Rotate slowly with drill. Remove old ledge. Vacuum debris.

Step 4: Install Repair Bushing

Insert bushing. Finish new ledge with M20159 plate.

Specs at a Glance

Spec	Detail
SKU	M52050
Fit	CAT, Cummins, Detroit blocks
Replaces	PT-2050-D
Features	Removable handle, micrometer, hold-downs
Price	$9,700.00

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Related Counterbore Tools

M20159 Counterbore Cutter Plate Assembly 5 1/2" Bore

$554.53

PT-2000-109 Counterbore Sleeve Cutting Bit

$72.00

M10226 Counterbore Cutter Plate for CAT 3406 & 3408

$554.52

M30146 Detroit Diesel 60 Series Top Deck Kit

$1,184.53

Counterbore Depth Spacer Tool PT2000-138

$139.75

M30145 Detroit Diesel 60 Series Counterbore Kit

$870.52

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