APS Preinstallation guide for used engines

Installation Protocol · 6 Steps

Engine Pre-Installation.

Your step-by-step field guide for fitting a used engine the right way — follow every step to keep your warranty valid.

Seals & Timing Cooling System Oil & Filter Final Inspection
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What's Inside
  1. Replace timing components & seals
  2. Transfer accessories
  3. New water pump & thermostat
  4. Clean the intake & ports
  5. Change oil & filter
  6. Final inspection
Installation Protocol · Six Steps

Do it right, the first time.

Each step below is part of keeping your warranty valid. Work through them in order — skipping any one of them can compromise the engine and forfeit your coverage.

🔧 Step 01
Step 1

Replace Timing Components & Seals

  • Install a new timing belt (If suggested by your installer)
  • Replace all external seals, including:
  • Crankshaft seals (front and rear)
  • Camshaft seals
  • Oil pan gasket
  • Valve cover gasket
  • Intake manifold gasket
🔄 Step 02
Step 2

Transfer Accessories

Move over all accessories from your old engine to the replacement. This includes:

  • Sensors
  • Brackets
  • Pulleys
  • Belts
  • Mounts
The recycled engine comes with accessories for convenience only. These are not covered under warranty and should not be relied on.
💧 Step 03
Step 3

Install New Water Pump & Thermostat

  • Install a new water pump.
  • Replace the thermostat with a new one.
  • Use a 50/50 mix of antifreeze and water.
  • Check the cooling system for leaks before startup.
🧼 Step 04
Step 4

Clean the Intake & Ports

  • Clean out the intake manifold thoroughly.
  • Check the intake and exhaust ports for any loose bolts, nuts, or debris.
Important: Debris from a failed engine can get stuck inside the intake and cause serious damage to the new engine. This is the installer's responsibility.
🛢️ Step 05
Step 5

Change Oil & Filter

Install a new oil filter.

Add fresh oil before the first startup.

Change oil and filter every:

3,000 miles, or
As recommended by your vehicle's manufacturer

(Never go over 5,000 miles between oil changes.)

Keep receipts for oil changes as proof of maintenance.

🔍 Step 06
Step 6

Final Inspection

  • Double check all sensors and connectors.
  • Make sure everything is tightened to spec.
  • Prime the engine with oil if needed (especially for long-stored units).
  • Crank the engine a few times without starting to build oil pressure.
· · ·

Need help? We're glad to give it.

Every install is different. If anything on this checklist isn't clear for your engine, talk to a real specialist before you turn the key — we'd rather answer a question than process a claim.

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