Hummer Engine mount

Mark · Feb 9, 2004

I was wondering if the engine mount in my Hummingbird was sufficient enough. Are those nylon countersunk bolts enough. Is the nylon used for weight saving. I was wanting to use ally bolts. Is that a problem? I've also heard from other people on here that have one of these boats that the engine mount is junk. I don't have much time at all for leisure, so I want to make it right the first time. What is the best layout for engine mounts in hydros?

Ian Inverarity · Feb 9, 2004

Mark,

The nylon bolts are strong enough. But the problem is the mounts are too rigid, practically solid mounts. This leads to a lot of vibration in the boat which leads to other problems.

Both Craig and I adapted conventional rubber type mounts and made new mount beams to suit. I used Commodore air filter mounts, these are M6 threads, narrow, and should be cheap.

Ian.

Don Ferrette · Feb 9, 2004

Mark said:
I was wondering if the engine mount in my Hummingbird was sufficient enough. Are those nylon countersunk bolts enough. Is the nylon used for weight saving. I was wanting to use ally bolts. Is that a problem? I've also heard from other people on here that have one of these boats that the engine mount is junk. I don't have much time at all for leisure, so I want to make it right the first time. What is the best layout for engine mounts in hydros?

Absolutely, positively toss the the screws & the rubber washers. Go to your local hardware store & buy some 1/4-20 nylon screws & rubber grommets like in pic below. Drill tub out to match grommets. Use nylon spacers to achieve correct spacing.....

Don Ferrette · Feb 9, 2004

... cut any extra off screw with X-acto knife so you wind up with this............

Don Ferrette · Feb 9, 2004

The stock engine rails are fine & are threaded 1/4-20. The stock nylon spacers should be about right once you toss the thin rubber washer & go with the grommets. This conversion will probably cost you about $5.00, will be lightweight & plenty strong.