Core Plug Replacement
SPECIAL TOOLS Slide Hammer 100-001 (T50T-100-A)
Scheme 31
| Item | Specification |
|---|---|
| Threadlock 262 TA-26 | WSK-M2G351-A6 |
MATERIAL SPECIFICATIONS
All core plugs
Pinpoint Test A
A2
Cup-type
- NOTE: Oversize plugs are identified by the OS stamped in the flat located on the cup side of the plug.
- Inspect the core plug bore for any damage that would interfere with the correct sealing of the plug. If the core plug bore is damaged, bore for the next oversize plug.
- Cup-type
A3
Expansion-type
- NOTE: Use care during this procedure so as not to disturb or distort the cup sealing surface.
- NOTE: When installed, the flanged edge must be below the chamfered edge of the bore to effectively seal the bore.
- Coat the cup-type core plug and bore lightly with sealant and install the core plug using a freeze plug installer.
Scheme 32
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Scheme 35
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Scheme 38
- Inspect the spark plug for a bridged gap. Check for deposit build-up closing the gap between the electrodes. Deposits are caused by oil or carbon fouling. Install a new spark plug.
- Check for oil fouling. Check for wet, black deposits on the insulator shell bore electrodes, caused by excessive oil entering the combustion chamber through worn rings and pistons, excessive valve-to-guide clearance or worn or loose bearings. Correct the oil leak concern. Install a new spark plug.
- Inspect for carbon fouling. Look for black, dry, fluffy carbon deposits on the insulator tips, exposed shell surfaces and electrodes, caused by a spark plug with an incorrect heat range, dirty air cleaner, too rich a fuel mixture or excessive idling. Install new spark plugs.
- Inspect for normal burning. Check for light tan or gray deposits on the firing tip.
- Inspect for pre-ignition, identified by melted electrodes and a possibly damaged insulator. Metallic deposits on the insulator indicate engine damage. This may be caused by incorrect ignition timing, wrong type of fuel or the unauthorized installation of a heli-coil insert in place of the spark plug threads. Install a new spark plug.
- Inspect for overheating, identified by white or light gray spots and a bluish-burnt appearance of electrodes. This is caused by engine overheating, wrong type of fuel, loose spark plugs, spark plugs with an incorrect heat range, low fuel pump pressure or incorrect ignition timing. Install a new spark plug.
- Inspect for fused deposits, identified by melted or spotty deposits resembling bubbles or blisters. These are caused by sudden acceleration. Install new spark plugs.