Cylinder Wall Inspection Tool (BJA10085)

CYLINDER WALL INSPECTION TOOL

TECHNICAL SERVICE BULLETIN

BACKGROUND

The Cylinder Wall Inspection Tool (P/N 07AAJ-R70A300) was developed to provide a more consistent way to determine if a scratch will be acceptable or not. Traditional methods such as using a fingernail or pencil lead are inconsistent and is based on the interpretation of the technician.

Due to these inconsistencies, there has been a high quantity of short block replacement since most technicians would prefer to error on the side of caution than risk a possible comeback. The reason for this is because the majority of blocks replaced under warranty and returned to American Honda for evaluation had light to moderate scratching.

Many of these blocks were inspected, reassembled with new pistons and rings, and extensively tested. Originally it was thought that light to moderate cylinder wall scratches affected the engine block durability and oil consumption. Current testing on affected vehicles (as listed in the S/Bs) indicates that light to moderate scratches do not affect these two issues.

APPLICABILITY

This cylinder wall inspection tool was designed to only be used on the following Warranty Extensions and not for use on other short blocks:

• S/B 13-006, Warranty Extension: Sticking Rings Resulting in High Engine Oil Consumption 

PROCEDURE

1. Make sure there are no deformations on the tip of the tool prior to use.
2. Wipe the scratched cylinder wall with a clean shop towel.
3. Use another clean shop towel to apply 0W-20 engine oil to the cylinder on and around the scratches.
4. Coat the tip of the tool in 0W-20 engine oil.
5. Holding the tool handle, place the tool inside the cylinder near the scratch and apply pressure on the tool until the roll pin is in the green area.
6. Slide the tip of the tool back and forth across scratches while keeping roll pin in green area. This ensures that the proper pressure is being applied.
   NOTE:

   • If the tool slides over vertical scratches consistently without catching, skipping, or vibrating, the scratch is acceptable and this cylinder wall is acceptable for use.
   • If tip of tool consistently catches, skips, or vibrates while going over vertical scratches multiple times, the short block must be replaced.

   Refrain from using a finger nail to test for scratches. Light to moderate scratches that your finger nail might catch on will pass with this tool.