Cummins engine beds

[twonahil]

Replacing 454's with cummins 5.9 engines. Anyone have ideas for new bed architecture? I have removed bertram wood sisters already.

[CaptPatrick]

Here's a couple of links that may help you out...

http://bertram31.com/proj/tips/engines.htm

http://bertram31.com/newbb/viewtopic.ph ... lit=+ramps

[Ironman]

Bob has a formula for a template..for the Cummins buddys...worked great for me.. one 4x4 & a couple 2x4s

[Whaler1777]

Ipe epoxy bedded to stringers, capped with 3/8" welded u 6061 aluminum, ramps are 1/2" 6061 welded and through bolted thru entire stringer and top to bottom with 1/2" bolts..


Nice to have access under the engines...

[twonahil]

Whaler,

after removing the Bertram 454 beds did you cut down the remaing strigers at all? Also, do you have any shop drawings for the aluminum motor risers?

[Bob H.]

Twoanil, you have to make your mounts meet the engine shaft alignment. Each boat is different. I hung the engines from a gantry pulled a string from the rudders forward, set the rear engine mounts as low as possible to clear the hull with the tranny. The tranny angle and strut shaft angle are a "given" line them up with laser or string and fab your mounts out of wood. Then off to good metal shop and leave a lil room for adjustment. Presto just what whaler has in those pics. BH
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[Bob H.]

I tossed the stock cummins mounts not even close. I used plywood, 2 x 4s and cedar shims get it just where it "needs" to be. My machine shop guy loved them. Don't forget to leave extra room for the water pump impeller removal. I worked that forward engine mount until I could change the impeller without jacking up the motor, only needed a bit of caressing with an angle grinder.I sent my set of wood templates to Luis in Portugal. BH

[twonahil]

Thanks Bob, I realize every installation is different and every bit of info regarding trials and errors of others helps with making decisions without going backwards. Thanks again I like your idea of making wood parts for welder.