T&T: After Market Installations

[Mike. Maurice]

When a boat manufacturer is adding accessories to an engine, in order to 
get the engine builder to sign off on the installation, someone with 
engineering experience generally will have to examine the specifications 
for power takeoff, fuel system, etc.

Taking power off an engine is not simply a matter of hooking up a belt. 
The strength of materials, bearing and shafts, has to be taken into 
account. The specifications will generally be in so many pounds of side 
load or whatever. Power takeoff systems expressly built for the job will 
have limitations of so much horsepower, speed, torque, etc.

After market installations often times never take these limitations into 
account. In point of fact, the majority of installers don't even know 
about the problem. Belt driven installations that exceed the side 
loading specifications of the crankshaft will generally cause premature 
failure of the nearby bearings. A consequence which may not become 
evident until many years or hours of operation have gone by.

Mike
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Capt. Mike Maurice
Tigard Oregon(Near Portland)