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Gearbox mount

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Nick Field
Member
Username: nickf

Post Number: 7
Registered: 11-2009
Posted on Monday, July 15, 2013 - 12:12 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Hi

From what I can understand the bracket for the Gbox mounts under the engine and the box is bolted to this.
Is there any other support.
And as the bracket has 2 holes are these for adjustment
Thoughts ,suggestions and pictures would be appreciated.
Bracket



Nick
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Andrew Munns
Senior Member
Username: johnoxley

Post Number: 86
Registered: 04-2010
Posted on Monday, July 15, 2013 - 01:33 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

The bracket on mine is a weldment in angle.
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Allen
Advanced Member
Username: allenf

Post Number: 34
Registered: 02-2011


Posted on Wednesday, July 17, 2013 - 08:07 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

from my picture collection.

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Nick Field
Member
Username: nickf

Post Number: 8
Registered: 11-2009
Posted on Wednesday, July 17, 2013 - 11:35 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Thanks Allen
"A picture says a thousand words"
So the bracket is mounted on top of the engine and I will have to drill a couple of holes through the base plate.
Would it be ok to fix to the base or should the bracket be attached to the motor mount (the wooden blocks that are fixed to the boat)
Any thoughts?

Nick
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Andrew Munns
Senior Member
Username: johnoxley

Post Number: 89
Registered: 04-2010
Posted on Thursday, July 18, 2013 - 12:11 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

My bracket is a weldment in angle. When I dismantled the gearbox from the engine it had been misaligned. Usual marine standard for this class of flange alignment is a 2/1000" feeler gauge fit at 12, 3, 6 and 9 o'clock. I will be shimming the mount to engine to achieve this.
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Andrew Munns
Senior Member
Username: johnoxley

Post Number: 90
Registered: 04-2010
Posted on Thursday, July 18, 2013 - 12:14 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

PS - The gearbox bracket bolts to the engine base.

I have a Blaxland Chapman instruction sheet for this gearbox scanned as a pdf. If you want, send me your email.
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Nick Field
Member
Username: nickf

Post Number: 9
Registered: 11-2009
Posted on Thursday, July 18, 2013 - 12:48 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Hi Andrew

The instructions would be a great help
fieldfam113@bigpond.com
What is weldment in angle?
Thanks for you input

Nick
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Greg Y
Senior Member
Username: gregoryan

Post Number: 107
Registered: 09-2004


Posted on Thursday, July 18, 2013 - 03:48 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

weldment in angle = welded - cant be re-aligned [ as opposed-to a bolted-together assembly] sounds like this was done before Andrew owned it.
Allen's pic shows that there are other mounting holes that may be used to secure the aft end of gear box to the beds too [via brackets], perhaps? This may be a good idea, as i have seen one of these engines with quite a bad 'barred zone'; a rev-range to be avoided because of vibration; One could see the engine pitching fore and aft on its beds, as there was so much overhang behind engine's baseplate!
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Andrew Munns
Senior Member
Username: johnoxley

Post Number: 91
Registered: 04-2010
Posted on Thursday, July 18, 2013 - 08:14 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Moderator/Admin Only)

Sorry - weldement is a steel fabrication welded, rather than the casting that appears in the images. Suspect Blaxlands were experimenting - not sure.

When I get time to split the gearbox I will photograph the frame as well.

Re shimming, I will have to shim the connection between gearbox bracket and engine crankcase in order to obtain satisfactory alignment between the engine output flange and gearbox input flange. The last person who assembled the gearbox to the engine did not achieve good enough alignment.

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