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Tio Pancho

  • Karma: +11/-0
Mounting Plate Bolt Holes
« on: June 22, 2011, 09:03:40 PM »
When I put the bolts throught the front mounting plate into the block they seem a little loose. The threads look a little flat inside the hole. The bolts are 3/8" which I think is right. I ran a chaser through, but it didn't do anything cuz there is no material to reshape. Have not tried the rear plate because it is still on the engine stand. What can I do?
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ka0tyk

  • Karma: +30/-0
Re: Mounting Plate Bolt Holes
« Reply #1 on: June 22, 2011, 09:59:43 PM »
Quote from: Tio Pancho on June 22, 2011, 09:03:40 PM
When I put the bolts throught the front mounting plate into the block they seem a little loose. The threads look a little flat inside the hole. The bolts are 3/8" which I think is right. I ran a chaser through, but it didn't do anything cuz there is no material to reshape. Have not tried the rear plate because it is still on the engine stand. What can I do?

im guessing drill and helicoil/timesert them?  is it all 4?
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Tio Pancho

  • Karma: +11/-0
Re: Mounting Plate Bolt Holes
« Reply #2 on: June 22, 2011, 10:09:23 PM »
Yeah its all 4. The block is cast right? Can you drill/helicoil it; if so will it hold up to the task?
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GT Jets

  • Karma: +192/-0
Re: Mounting Plate Bolt Holes
« Reply #3 on: June 22, 2011, 10:26:41 PM »
Quote from: Tio Pancho on June 22, 2011, 09:03:40 PM
When I put the bolts throught the front mounting plate into the block they seem a little loose. The threads look a little flat inside the hole. The bolts are 3/8" which I think is right. I ran a chaser through, but it didn't do anything cuz there is no material to reshape. Have not tried the rear plate because it is still on the engine stand. What can I do?


The front plate bolts on a fo fi fo Bo ty should be 7/16", not 3/8" give that a shot.... ;)

Hope all is well.

GT
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  • Boat #1: 1992 Carrera 20.5 Elite (I/O bitches)
  • Boat #2: 19' Bubble deck Jet BBC Berkeley
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Quote from: Brad @ SoCalJetBoats.com on December 22, 2009, 07:40:31 PM
If i get some free time tonight at work, ill play with it and post it for everyone to see.

Quote from: IRRebel on June 11, 2011, 07:30:45 PM
Time to man up and yank it John!  :banghead:
Ray

Tio Pancho

  • Karma: +11/-0
Re: Mounting Plate Bolt Holes
« Reply #4 on: June 22, 2011, 10:35:51 PM »
Doh! :banghead: That would explain a lot. I will give it a shot tomorrow.
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Dirty Air

  • Karma: +1/-0
Re: Mounting Plate Bolt Holes
« Reply #5 on: June 23, 2011, 12:14:22 AM »
GT is exactly right.   the 4 lower bolt holes on BBC are 7/16-14 and rear plate (or bell housing) are 3/8-16
and yes, they can be heli-coiled if necessary. but if at all possible try to find a Time-sert instead, they are much stronger.
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Quote from: HDriderTH on June 09, 2011, 10:51:13 AM
You know me, my 12"incher is upside down!
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