A cracked counterbore ledge on a CAT, Cummins, or Detroit diesel block used to mean one thing: scrap it and buy a new block for $5,000–$12,000. Today, the M52050 Top Deck Counterbore Sleeving Tool (PT-2050-D equivalent) lets you salvage those blocks. This heavy-duty USA-made machine tool bores out damaged counterbores and preps the deck for repair sleeve installation—saving shops $4,000–$8,000 per block while delivering factory-spec results.

The Cracked Block Crisis: From Scrap to Salvage

Diesel engine blocks don't fail all at once. Often, a single cracked counterbore ledge, an over-machined deck, or a shim-cut ledge that's gone too deep is the only problem. The rest of the block is perfectly good. Traditionally, shops had two options:

• Scrap it: Dispose of a $5,000–$12,000 block
• Risk it: Reassemble with a cracked ledge (= guaranteed leak and failure)

The M52050 created a third option: repair it professionally. By boring out the damaged ledge and installing a repair sleeve, your block is as good as new—and you pocket $4,000–$8,000 in savings.

What the M52050 Does: Heavy-Duty Block Deck Repair

The M52050 Top Deck Counterbore Sleeving Tool is engineered to:

• Machine out damaged counterbores – Removes cracked, worn, or over-cut ledges
• Create uniform bore – Prepares deck for repair sleeve installation
• Install repair bushing – Allows insertion of precision-fit sleeve insert
• Finish new ledge – Compatible with finishing cutters for perfect deck height
• Salvage expensive blocks – Turns scrap into serviceable components

M52050 Specifications: Built for Precision and Power

Key Features: Why Shops Choose M52050

• ✅ Removable Handle Design
  Easier access in tight engine bays and rebuild benches—removed quickly for compact positioning.
• ✅ Heavy-Duty Construction
  91 lbs of precision-engineered steel; built to survive decades of shop use.
• ✅ Precision Boring
  Hold-down fixtures and micrometer block ensure repeatable, factory-spec deck heights.
• ✅ PT-2050-D Replacement
  Direct equivalent to Porta-Tool standard—familiar to experienced rebuilders.
• ✅ Salvage Expensive Blocks
  Turn $10,000 scrap into a usable block; save $4,000–$8,000 per engine.
• ✅ USA Made
  Built to last; support domestic manufacturing.
• ✅ Complete Kit
  Comes with all fixtures and standards; cutters/sleeves purchased separately.

Engine Block Applications

The M52050 repairs cracked and damaged top decks on heavy-duty diesel blocks:

• Caterpillar
  3400, 3500 Series, C15, C16, C18
• Cummins
  ISX, ISM, N14, M11, L10
• Detroit Diesel
  Series 60, DD13, DD15, DD16
• Mack
  E7, MP7, MP8, MP10
• Volvo
  D11, D12, D13, D16
• International
  MaxxForce DT, HT570

ROI: M52050 Pays for Itself Fast

Common Counterbore Damage Fixed by M52050

Salvage Blocks = Protect Profits