Mercury 40 FourStroke Maintenance And Installation Manual page 99

FASTENING THE OUTBOARD TO THE TRANSOM
Mounting Bolts
Outboard Transom Mounting Hardware ‑ Supplied with Outboard
Part Number
8M0071543 Outboard mounting bolt ½‑20 x 5.00 in. long (3.25 in. thread)
826711‑17
28421
54012
Part Number
67755005
67755006
814259
67755‑1
8M0071543
8M0038370
67755‑2
8M0028080
8M0032860
Checking Boat Transom Construction
IMPORTANT: Determine the strength of the boat transom. The outboard
mounting locknuts and bolts should be able to hold 75 Nm (55 lb‑ft) of torque
without the boat transom yielding or cracking. If the boat transom yields or
cracks under this torque, the construction of the transom may not be adequate.
The boat transom must be strengthened or the load carrying area increased.
a - Transom yielding under bolt torque
b - Transom cracking under bolt torque
eng
INSTALLATION
Part Name
Nylon insert locknut
Flat washer
Flat washer
Available Outboard Mounting Bolts
a
½‑20
1.50 in. diameter
0.875 in. diameter
Description
½‑20 x 2.50 in. long (1.25 in. thread)
½‑20 x 3.50 in. long (1.25 in. thread)
½‑20 x 4.00 in. long (2.25 in. thread)
½‑20 x 4.50 in. long (2.25 in. thread)
½‑20 x 5.00 in. long (3.25 in. thread)
½‑20 x 5.50 in. long (3.25 in. thread)
½‑20 x 6.50 in. long (2.75 in. thread)
½‑20 x 7.50 in. long (2.75 in. thread)
½‑20 x 8.00 in. long (2.75 in. thread)
b
89
Description
18961