Heavy-Duty Spin-On Filter Pair – Models 23530644 & 23518671

These two spin-on cartridges serve complementary roles on heavy-duty diesel engine platforms (Series 60-class engines and related industrial power units). 23518671 is a full-flow lube-oil filter with a large-diameter canister for main-engine duty, while 23530644 is a more compact spin-on specified for fuel or auxiliary hydraulic/lube loops on the same platform. Both use proven media packs and integrate bypass protection, making them direct-fit replacements for the OE filter heads.

Key Features

• 23518671: 118 mm OD × 260 mm long canister, 1½-12 UN thread, full-flow cellulose media, 21 μm @ 99 % efficiency (SAE J1858)

  
  

• 23530644: 70 mm OD × 154 mm long, 1-12 UNF thread, glass-fiber composite media, 10–15 μm grade, suited to fuel-stage or hydraulic auxiliary duty

  
  

• Anti-drain-back valve prevents dry starts on oil-circuit installs

  
  

• NBR gasket standard; relief/bypass integrated per OE head design

  
  

• Carbon-steel rolled shell, zinc-plated end caps, corrosion-resistant finish

  
  

Technical Specifications

Application Guidance

23518671 – Primary full-flow lube-oil filter on Series 60 heavy-duty diesel engines used in Class 8 trucks, generator sets, and off-highway power units. The 118 mm OD / 260 mm length canister delivers high dirt-holding for long drain intervals under continuous-load operation. Two units per engine is typical on this platform.

23530644 – Compact spin-on for the same engine family's secondary circuits: fuel-stage filtration ahead of the injection pump, or hydraulic/auxiliary lube loops on generator skids and pump packages. The 70 mm OD keeps the footprint small where head space is limited. Also cross-referenced to certain European fuel-filter heads (WK8149-type pattern).

🔧 Both are spin-on — hand-tighten until gasket contacts the head face, then ¾ turn. Do not use a strap wrench on the canister shell. For oil duty (23518671), pre-fill if the head design allows; for fuel duty (23530644), prime per engine procedure and check for air locks.

Fluid Compatibility

• Mineral engine oil (API CK-4, FA-4, etc.)

  
  

• Diesel / middle-distillate fuel

  
  

• Hydraulic mineral oil (HM/HV) – 23530644 only, verify pressure class

  
  

• HFC water-glycol – NBR acceptable for mild duty; FKM on request

  
  

• Not for phosphate ester (HFDR)

  
  

Installation & Service

1. Clean the filter-head mounting face; inspect the head's center tube and threads.

   
   

2. Lubricate the new gasket with clean fluid, spin on by hand until seated, then ¾ additional turn.

   
   

3. For oil-filter duty: pre-fill the canister to reduce startup starvation; run the engine and check for leaks at operating pressure.

   
   

4. For fuel-filter duty: bleed the head per engine manual; check for air in the feed before load.

   
   

5. Replace per OEM hour/mile/drain interval or when pressure-gauge deviation indicates clogging. Log change intervals to trend dirt load.

   
   

Quality Assurance

Each batch verified for:

• SAE J1858 (23518671) / SAE J1985 & ISO 16889 (23530644) – filtration efficiency

  
  

• ISO 2941 – collapse/burst resistance

  
  

• ISO 2942 – manufacturing integrity

  
  

• ISO 2943 – media/fluid compatibility

  
  

• Shell pressure-test before packing

  
  

Ordering Information

Specify 23530644 (compact, 70×154 mm, fuel/hyd aux) or 23518671 (large canister, 118×260 mm, full-flow oil) with quantity. Seal material (NBR / FKM) can be specified if fluid duty requires. Cross-reference to common OEM engine-filter numbers available on request — provide your engine family and existing OEM part number for confirmation.

All values nominal; confirm thread face, gasket dimensions, and pressure class against your actual filter head before installation.