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How do the 8 lag bolts in the stringer hold the engine in place

searay57

Contributing Member
"My question is just for my ow

"My question is just for my own knowledge. I know it is enough to do the job, but it seems like the prop should push the lags right out trying to propel a 10,000 lbs boat. if anyone has an explination please let me know."
 
"Are you sure they are lag bol

"Are you sure they are lag bolts or are they machine bolts screwed into a piece of drilled and tapped aluminum or steel laminated into the stringer?

Many manufacturers do that, but most mount the engines on engine mount brackets which are through bolted to the stringer system. A lot of I/Os are lag bolted, but in their case the thrust from the prop is not pushing on the mounts, rather the transom."
 
"Good point, Rick. In fact, A

"Good point, Rick. In fact, ALL I/Os are setup that way, hence the splines in the drive shaft yokes. Straight inboards, by contrast, ALWAYS have the motors absorbing the thrust.

Jeff

PS: In my aluminum boat, the mounts are through bolted to the stringers."
 
they are lag bolts. i understa

they are lag bolts. i understand how it works on i/o the thrust is pushing on the transom. if you look in the crusader installation manual it recommended good lag bolts to transfer the thrust.
 
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