Engine Mount Hold Down Bolts

[Winf]

Originally Posted by Wotname

To be clear, in Oz, you can get hanger bolts (insert favourite name here) in a variety of materials but not in silicon bronze.

Freight from the USA was quoted at $75 USD - ouch! Probably could have found a cheaper freight option but didn't pursue it.

Yep, what Wot said.

I can find bronze lag bolts and do the cut off head and cut a thread thing but seems like a lot of mucking around. Is that what you ended up doing Wot?

Guess I could just use the lag bolt as is but to me I would have thought that the hanger bolt would be the better arrangement as every time you change out the mounts you will just make the lag bolt hole loose.

I can find plenty of 316 hanger bolts and 316 might be the go but I have seen some nasty pics of rusted out ferrous bolts in these applications but bronze seems to be the ideal robust solution.

Thanks for all the input.

[Wotname]

Originally Posted by Winf

Yep, what Wot said.

I can find bronze lag bolts and do the cut off head and cut a thread thing but seems like a lot of mucking around. Is that what you ended up doing Wot?

Guess I could just use the lag bolt as is but to me I would have thought that the hanger bolt would be the better arrangement as every time you change out the mounts you will just make the lag bolt hole loose.

I can find plenty of 316 hanger bolts and 316 might be the go but I have seen some nasty pics of rusted out ferrous bolts in these applications but bronze seems to be the ideal robust solution.

Thanks for all the input.

I do think a hanger bolt is a better arrangement than a lag bolt and bronze is way better than SS. As for the effort to convert a lag bolt to a hanger bolt, well it depends on the user I guess. It didn't seem much effort to me compared with all the other boat maintenance items but YMMV.

I was ready to convert one and I already had the gear to do it BUT in the end I was speaking to part time semi retired local shipwright about another matter when I asked him casually if he had ever seen any bronze hangar bolts for sale. He said, "None for sale but I got a couple in the bottom of my tool box exactly that size. They have been there for years, here have one".
He refused any payment or other recompense! I think I used up a year or more of good luck in that single encounter!