DRIVE SHAFT / PROPELLER SHAFT MODELS
SERVICE MANUAL NUMBER 23
90-861326--1 MARCH 1999 Page 8F-7
Replacement Drive Shafts
MerCruiser furnishes a 58 in. (1473 mm) or 34-1/2 in. (876 mm) long drive shaft with
extension shaft models. Some boat manufacturers modify the drive shafts to a shorter
length. Because of this, use the following procedure to obtain replacement drive shafts.
“X”
a
b
b
e
c
c
d
d
a-Tube
b-Yoke - Tube
c-Flange
d-Universal Joint
e-Sound Deadener (Cardboard Tube)
The complete drive shaft can be ordered from Mercury Marine.
Drive Shafts Modified to Shorter Lengths
The complete modified (shortened) drive shaft has to be ordered from the boat
manufacturer that installed the MerCruiser Power Package.
IMPORTANT: Dana Corporation - Spicer Regional Drive Shaft Centers will not shorten
replacement drive shafts for dealers or consumers.
If a boat manufacturer is currently having extension drive shafts modified, they must be
modified by one of Dana Corporation - Spicer Regional Drive Shaft Centers to maintain
MerCruiser warranty. The modified drive shaft must meet the following specifications.
• U-joints aligned radially within 0° (± 1/2°).
• U-joints greased, after welding, with Quicksilver U-Joint and Gimbal Bearing Grease.
• Assembly balanced to within 1.5 oz. in. (0.01 N·m) to 4500 RPM.
• Tube to have .005 in. (0.127 mm) to .010 in. (0.254 mm) interference fit with tube yoke.
• Tube must be straight and round within .015 in. (0.381 mm).
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