| Author |
Message |
    
Nick Field
Member
Username: nickf
Post Number: 7
Registered: 11-2009
| | Posted on Monday, July 15, 2013 - 12:12 am: | 
|
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.
Nick |
Andrew Munns
Senior Member
Username: johnoxley
Post Number: 86
Registered: 04-2010
| | Posted on Monday, July 15, 2013 - 01:33 am: |
|
The bracket on mine is a weldment in angle. |
Allen
Advanced Member
Username: allenf
Post Number: 34
Registered: 02-2011
| | Posted on Wednesday, July 17, 2013 - 08:07 am: |
|
from my picture collection.
 |
Nick Field
Member
Username: nickf
Post Number: 8
Registered: 11-2009
| | Posted on Wednesday, July 17, 2013 - 11:35 pm: |
|
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 |
Andrew Munns
Senior Member
Username: johnoxley
Post Number: 89
Registered: 04-2010
| | Posted on Thursday, July 18, 2013 - 12:11 am: |
|
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. |
Andrew Munns
Senior Member
Username: johnoxley
Post Number: 90
Registered: 04-2010
| | Posted on Thursday, July 18, 2013 - 12:14 am: |
|
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. |
Nick Field
Member
Username: nickf
Post Number: 9
Registered: 11-2009
| | Posted on Thursday, July 18, 2013 - 12:48 am: |
|
Hi Andrew
The instructions would be a great help
[email protected]
What is weldment in angle?
Thanks for you input
Nick |
Greg Y
Senior Member
Username: gregoryan
Post Number: 107
Registered: 09-2004
| | Posted on Thursday, July 18, 2013 - 03:48 am: |
|
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! |
Andrew Munns
Senior Member
Username: johnoxley
Post Number: 91
Registered: 04-2010
| | Posted on Thursday, July 18, 2013 - 08:14 pm: |
|
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. |
