Freeze Plugs - All

Complete replacement of all engine block and cylinder head freeze plugs, requiring engine removal or substantial disassembly to access all plug locations on the 302ci V8.

Warnings

Tools required

Parts

• Engine block freeze plugs (1-5/8" diameter) × 6 — Use OEM specification
• Cylinder head freeze plugs (1-1/4" diameter) × 2 — Use OEM specification
• Intake manifold gasket set × 1 — Fel-Pro MS90026 or equivalent
• Valve cover gaskets × 2 — Cork or rubber, OEM style
• Oil pan gasket × 1 — Use OEM specification
• Rear main seal (rope type) × 1 — Use OEM specification
• Front cover gasket × 1 — Use OEM specification
• Timing cover seal × 1 — Use OEM specification
• Water pump gasket × 1 — Use OEM specification
• Thermostat and gasket × 1 — 180-195°F rating
• Oil filter × 1 — FL-1A or equivalent
• RTV silicone sealant (high temp) × 1 — Permatex 81160 or equivalent
• Engine assembly lube × 1 — Use OEM specification
• Anti-seize compound × 1 — Copper or nickel based

Fluids

• Engine oil 10W-30 or 10W-40 conventional — 5 qt
• Coolant (ethylene glycol green 50/50) — 15 qt
• Transmission fluid (Type F ATF) — 2 qt

Preparation

1. Park vehicle on level surface and engage parking brake. Chock rear wheels.
2. Disconnect negative battery cable and secure away from battery post.
3. Remove hood by marking hinge positions and unbolting from hinges with assistant support.
4. Drain engine coolant by opening radiator petcock and removing radiator cap when cool.
5. Drain engine oil into appropriate container.
6. Remove air cleaner assembly and disconnect throttle linkage.
7. Label and photograph all vacuum lines, electrical connections, and hose routing.
8. Place drain pans and shop towels under work area to catch residual fluids.

Procedure

1. 1

   Remove radiator and cooling system components
   Disconnect upper and lower radiator hoses from engine. Disconnect transmission cooler lines from radiator if equipped with automatic transmission. Remove radiator shroud mounting bolts and radiator mounting bolts. Lift radiator and shroud assembly from vehicle as a unit. Remove heater hoses from engine block and heater core connections. Remove coolant bypass hose if equipped.
2. 2

   Disconnect fuel system and exhaust
   Disconnect fuel line at fuel pump. Cap or plug fuel line to prevent fuel spillage. Remove exhaust manifold flange bolts at exhaust pipe connections on both sides. Support exhaust system to prevent damage when engine is removed.
3. 3

   Remove engine accessories and front components
   Remove alternator mounting bolts and set alternator aside with wiring attached. Remove power steering pump mounting bolts and secure pump aside without disconnecting hydraulic lines. Remove fan belt(s). Remove fan blade assembly and water pump pulley. If equipped with A/C, remove compressor mounting bolts and secure compressor aside without disconnecting refrigerant lines. Remove distributor cap and mark distributor position on intake manifold for reinstallation reference.
4. 4

   Disconnect engine electrical and controls
   Disconnect all electrical connections including: starter solenoid wire, oil pressure sender, temperature sender, coil primary wire, and any other engine-mounted sensors. Disconnect throttle cable and kickdown linkage if equipped with automatic transmission. Remove choke cable if equipped. Disconnect PCV valve and breather hoses.
5. 5

   Separate transmission from engine
   Support transmission with transmission jack or floor jack with wood block. Remove transmission-to-engine bellhousing bolts (typically 4-6 bolts on small block Ford). On automatic transmission, remove torque converter-to-flexplate bolts through starter opening after removing starter motor. Mark flexplate and converter relationship for reassembly. On manual transmission, disconnect clutch linkage and remove transmission with clutch assembly. Carefully pull transmission rearward to separate from engine, ensuring torque converter stays with transmission on automatic models.
6. 6

   Prepare engine for removal
   Attach engine lifting chains or straps to engine lifting brackets on cylinder heads or intake manifold. Use engine leveler on hoist to balance engine. Remove engine mount bolts from frame brackets on both sides (driver and passenger). Verify all connections are disconnected and nothing will catch during removal.
7. 7

   Remove engine from vehicle
   Slowly raise engine with hoist while monitoring clearances around firewall, frame rails, and radiator support. Adjust engine angle with leveler as needed to clear transmission input shaft and bellhousing area. Continue lifting and tilting until engine clears front of vehicle. Move engine forward and continue lifting clear of vehicle. Transport engine to suitable work stand or stable bench.
8. 8

   Mount engine and remove external components
   Secure engine to engine stand using bellhousing bolt holes if available, or place on sturdy workbench with blocks supporting oil pan. Remove remaining external components for access: water pump, timing cover, oil pan, valve covers, intake manifold, and exhaust manifolds. Keep all fasteners organized by component.
9. 9

   Locate and inspect all freeze plug locations
   Identify all freeze plug locations on 302ci V8 engine: block side core plugs (typically 3 per side along cylinder banks, 6 total) plus rear block core/cam plug locations. Note that the 302 Windsor cylinder heads do NOT use freeze plugs. Inspect areas around freeze plugs for rust, corrosion, or previous leak evidence. Clean external surface around each plug location with wire brush.
10. 10

    Remove engine block freeze plugs
    Using freeze plug removal tool or center punch and hammer, strike center of first freeze plug to rotate it inward at angle. Use locking pliers or pry bar to extract tilted plug from bore. Repeat process for all 6 engine block freeze plugs. Alternative method: drill small hole in center of plug and use slide hammer with screw attachment. Take care not to gouge or damage freeze plug bore surface during removal.
11. 11

    Remove cylinder head freeze plugs
    Access the rear block core plug(s) located at the rear of the engine block (near the cam bore/rear of block behind the flywheel area). Use same removal technique: punch to tilt plug inward, then extract with pliers. These plugs may be more difficult to access and may require additional component removal if not already cleared.
12. 12

    Clean and prepare freeze plug bores
    Use emery cloth or sandpaper wrapped around appropriately sized socket or dowel to clean inside of each freeze plug bore. Remove all rust, corrosion, old sealant, and debris. Bore surface must be smooth and clean for proper plug sealing. Wipe bores clean with shop towels. Inspect for pitting or damage that might prevent proper seal. Apply light coat of RTV silicone sealant to outer diameter of bore (not the plug edge).
13. 13

    Install new engine block freeze plugs
    Apply thin bead of RTV silicone sealant around outer edge of new freeze plug. Position freeze plug into bore with the cupped (open/concave) side facing outward and the domed/closed face toward the coolant, so the sealing flange contacts the bore. Using appropriately sized freeze plug installation driver or large socket slightly smaller than plug diameter, tap plug squarely into bore. Drive plug in until outer face is flush to slightly below (0.020-0.040 inch) machined surface of block. Ensure plug seats evenly without cocking. Repeat for all 6 block freeze plugs.
14. 14

    Install new cylinder head freeze plugs
    Apply RTV silicone sealant to outer edge of the rear block core plug(s). Install using same technique as side block plugs, ensuring proper depth and square seating. Use correct size driver. Verify plugs are flush or slightly recessed from the machined surface.
15. 15

    Allow sealant to cure and inspect installation
    Allow RTV silicone sealant to cure per manufacturer recommendations (typically 24 hours for full cure, 1 hour for assembly). Inspect all freeze plugs (block side and rear block core plugs) to ensure proper seating, no gaps around edges, and flush installation. Wipe away any excess sealant squeeze-out with shop towel.
16. 16

    Reassemble engine components
    Reinstall all removed engine components in reverse order of disassembly: intake manifold with new gaskets, exhaust manifolds, valve covers with new gaskets, oil pan with new gasket, timing cover with new gasket and seal, water pump with new gasket. Apply thread locker to critical fasteners where appropriate. Torque all fasteners to proper specifications. Install new oil filter. If rope-type rear main seal was disturbed during work, replace with new seal.
17. 17

    Reinstall engine in vehicle
    Reverse removal procedure: Position engine on hoist and carefully lower into engine bay. Align engine with transmission while lowering. Adjust angle to mate bellhousing and transmission input shaft. Guide engine onto motor mounts. Install motor mount bolts. Remove hoist once engine is securely mounted.
18. 18

    Reconnect transmission and driveline
    Reconnect transmission to engine bellhousing and install all bellhousing bolts. On automatic transmission, install torque converter to flexplate bolts (align marks made during disassembly). Install starter motor. Reconnect clutch linkage on manual transmission. Install exhaust pipe flanges to exhaust manifolds.
19. 19

    Reconnect all engine systems
    Reconnect all components following labels and photographs from disassembly: electrical connectors, vacuum lines, throttle linkage, fuel line, heater hoses, radiator hoses, and all other connections. Install and tension drive belts. Reconnect power steering pump and alternator wiring. Double-check that all connections are secure.
20. 20

    Install cooling system and accessories
    Install radiator and shroud assembly. Connect radiator hoses (upper and lower). Connect transmission cooler lines if equipped. Connect heater hoses. Install fan blade assembly and fan belt(s). Reinstall air cleaner assembly.
21. 21

    Fill fluids and bleed cooling system
    Fill engine with 5 quarts of 10W-30 or 10W-40 engine oil. Fill cooling system with approximately 14-15 quarts (verify total system capacity) of 50/50 ethylene glycol green coolant mixture. Leave radiator cap off. Start engine and allow to reach operating temperature while monitoring for leaks around all freeze plug locations. Add coolant as needed to maintain level. Once thermostat opens and coolant circulates, check for proper cooling system operation. Top off transmission fluid if spillage occurred (approximately 2 quarts to check level).

Reassembly

1. Reinstall hood using alignment marks made during removal
2. Reconnect negative battery cable
3. Check all fluid levels: engine oil, coolant, transmission, power steering, brake fluid
4. Verify no tools or parts remain in engine compartment
5. Clear all fault codes if check engine light illuminated during procedure

Verification

• Start engine and verify smooth idle with no unusual noises
• Allow engine to reach full operating temperature (approximately 195°F) and verify no coolant leaks from any freeze plug location
• Check for proper oil pressure indication on gauge or warning light
• Inspect all freeze plug locations with flashlight while engine is at operating temperature, looking for any coolant seepage or wetness
• Perform test drive to verify proper engine operation, transmission shift quality, and coolant temperature stability
• Re-check all freeze plug locations after test drive and after overnight cold soak for any signs of coolant leakage
• Verify coolant level is stable after several heat cycles with no loss indicating leak

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