8938 Mercruiser PISTON AND PISTON PIN ASSEMBLY (STD)

Introduction
The problem that is identified below does not have a known permanent solution. Until a permanent solution is known, use the solution that is identified below.Problem
In certain applications the 142-5867 Crankshaft Seal and the 142-5868 Crankshaft Seal can leak. In some cases, there have been reports of repeat leaks on the same engine.Solution
Do not operate or work on this product unless you have read and understood the instruction and warnings in the relevant Operation and Maintenance Manuals and relevant service literature. Failure to follow the instructions or heed the warnings could result in injury or death. Proper care is your responsibility.
The 2W-1733 Crankshaft Seal Gp and the 2W-1734 Crankshaft Seal Gp are available for trial in applications that have experienced a history of leaks. This seal may be more durable in these types of applications.The 2W-1733 Crankshaft Seal Gp replaces the 142-5867 Crankshaft Seal and the 2W-1734 Crankshaft Seal Gp replaces the 142-5868 Crankshaft Seal.Table 1 contains the required tools for the 2W-1733 Crankshaft Seal Gp available on the sales models listed.
Table 1
Sales Model Part Number Part Name Quantity
3406
3408
3412
3456
C15
C16
C18
C27
C30
C32 9S-8858 Nut 1
5P-1733 Seal Locator As 1
5P-1737 Bolt 3
6V-6142 Seal Installer(1) 1
(1) Critical "Axial Gap" dimension is 5.28 0.13 mm (0.2 inch).Follow the step below before installing the 2W-1733 Crankshaft Seal Gp.
Illustration 1 g06414922
(T1) 6V-6142 Seal Installer
(D1) 5.28 0.13 mm (0.2 inch)
Measure seal installer (T1) for the critical axial gap shown in the above illustration as dimension (D1).Note: Checking the axial gap of the seal installer is required to ensure that the seal is installed correctly.Rear installation tooling depends on presence and part number of the rear crankshaft gear. Most 3406, 3408, 3412, 3456, C15, C16, C18, C30, and C32 (HEUI) engines are built without rear gear trains.The C27 (ACERT) and C32 (ACERT) engines are built with rear gear trains but have different rear crankshaft gears depending on application.To confirm the presence and the part number of the rear crankshaft gear, refer to Parts Identification , "“Gear Gp – Rear”" for the engine sales model.Table 2 contains the required tools for the 2W-1734 Crankshaft Seal Gp available on the sales models listed, that are not equipped with a rear gear train.
Table 2
Sales Model Part Number Part Name Quantity
3406
3408
3412
3456
C15
C16
C18
C30
C32 9S-8858 Nut 1
5P-1733 Seal Locator As 1
5P-1737 Bolt 3
6V-6143 Seal Installer(1) 1
(1) Critical "Axial Gap" dimension is 6.4 0.13 mm (0.25 inch).Follow the step below before installing the 2W-1734 Crankshaft Seal Gp.
Illustration 2 g06414945
(T2) 6V-6143 Seal Installer
(D2) 6.4 0.13 mm (0.25 inch)
Measure seal installer (T2) for the critical axial gap shown in the above illustration as dimension (D2).Note: Checking the axial gap of the seal installer is required to ensure that the seal is installed correctly.Table 3 contains the required tools for the 2W-1734 Crankshaft Seal Gp available on the sales models listed, equipped with the 222-3913 Crankshaft Gear.
Table 3
Sales Model Part Number Part Name Quantity
C27
C32 9S-8858 Nut 1
5P-1733 Seal Locator As 1
5P-7309 Bolt 3
6V-6143 Seal Installer(1) 1
(1) Critical "Axial Gap" dimension is 6.4 0.13 mm (0.25 inch).Follow the step below before installing the 2W-1734 Crankshaft Seal Gp.
Illustration 3