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Knightnight

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BBF 3 point to 4 point mount conversion
« on: April 18, 2022, 07:16:08 am »
I found this thread but need further clarity on the exact process having never pulled the engine or tried to align drive shafts.
https://www.socaljetboats.com/engine-mechanical-electrical/converting-bbc-from-3pt-to-4pt-mounts/

I need to replace my driveshaft and figured I might as well convert to 4 point mount with the engine out for ease of use disconnecting drive shaft when running out of water and more rigidity with more power upgrades down the road. I believe I have existing center mounts so I should be able to mount everything without having to worry about drive-line angle changes.

steps:
- mount front mounts to block and drill holes into stringer with engine still installed with 3 point mount
- pull engine
- remove 3 pt bell housing
- install 4 point rear mount on engine block
- put engine back in and attach via 4 pt front mount and existing old center mounts
- mark rear 4 point stringer holes and drill stringer
- pull engine again, remove old center mounts and plug old center stringer holes (best method to fill holes)?
- install engine in new 4 point mounts



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Backwoods_Ranger

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Re: BBF 3 point to 4 point mount conversion
« Reply #1 on: April 24, 2022, 09:40:32 pm »
I haven?t mounted my engine back in the stringers yet, but I did just fill the old holes. I bought a 4? 1/2? oak dowel Rod. Drilled the old holes to 1/2? ground down the glass around the stringers soaked the cut to width dowels in resin. Slipped them in the new holes and laid glass over them.


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