stripped lag screws for motor mounts

[sixfootdrop]

Re: stripped lag screws for motor mounts

Re: stripped lag screws for motor mounts

santa 666,
No I'm not nuts.Your point is well taken about the possibility of leakage, but the hull is the strongest part of the boat and I can't imagine a stronger set-up than through-bolting. I understand that it is unorthodox, but am curious what exactly the pitfalls are ( leaking, corrosion)and if they could be avoided. If it didn't work, it would be an easy fix to plug the holes. It's not like it's rocket surgery.

 

[klos]

Re: stripped lag screws for motor mounts

Re: stripped lag screws for motor mounts

The hull is not made to have direct stress. That is what the engine mount stringers are for. If you through bolt engine mounts to the hull I would think that you would devolope some serious stress cracks over time & decrease the performance of the hull. This is one of those bad ideas that should be scraped right now. Like stated before, do some research and fix it right.

 

[Bondo]

Re: stripped lag screws for motor mounts

Re: stripped lag screws for motor mounts

If it didn't work, it would be an easy fix to plug the holes. It's not like it's rocket surgery.

Maybe Not Rocket Science,............But it Does come down to Hydro-Dynamics,...........
And,........
IF it Did Work,..........
Don't you Think that some Manufacturer out there would be Doing It by now,........
Those little Bumps you're going to glass over on the Bottom of the Hull will turn that boat into the Squirrellyest Barge Ever to Hit the Water............

As stated above,.........
Wood,........ Or possibly some sort of Fiberglass Stringers,.....
Epoxied to the Inside of the Hull, is the Basis for the Back-Bone of Fiberglass Hulls.........
And That's the Strongest part of the Hull..........

The boat has a 350 chevy w/ an OMC outdrive. The motor mounts have been fastened to an aluminum plate (a modification) which is lagged into the stringers to disperse the load, but no matter how you slice it lags are a bad idea. Considering running stainless through-bolts through the hull and welding to a 1/4" plate on the bottom of the hull (approximately 4" x 24") on each side, and than glassing over it. What do you think?

There's Absolutely NOTHING Wrong with using Lag Bolts to retain the Motor Mounts............

And,...... The Hi-lited quote Tells Me that the Stringers are ROTTEN,+ the PO Tried to Cob it Together,.........
Then he Dumped this little jewel on You...........

'ell,............ 6 or 8, 1/2" Lag Bolts will Easily hold down that Little 350SBC you've got lying in the bilge...............

 

[santa666]

Re: stripped lag screws for motor mounts

Re: stripped lag screws for motor mounts

Yes, scrape that idea, or better yet it should be scrapped I do hate the grammar stuff, but lets at least all use the Kings English. (please pass the grey poupon.)

So, lets all take a lesson from our fleet admiral and rebuild it like the maker intended (only newer, stronger, and faster) Ok steve Austin?

Yes, all of his bionics were on the INSIDE.

P.S. My through bolting was never through a hull always through the deck with a backing plate and several sets of washers. I am VERY sorry for any confusion.

 

[Reponator]

Re: stripped lag screws for motor mounts

Re: stripped lag screws for motor mounts

I have a sea ray with the same drive and motor mount setup. My engine mount holes were wallowed out as well. The wood seemed ok so I have filled it in with a resin mix and I'm going to redrill holes and use lags. I don't think this engine would put any more stress than any other mount system. I start and run the the engine now without it being bolted down and it doesn't even wiggle. I know it's not the same as pushing the boat through the water, but I think lags will hold nicely. we shall see.