| Author |
Message |
    
David Williams
New member
Username: davidywilliams
Post Number: 1
Registered: 02-2016
| | Posted on Tuesday, March 01, 2016 - 05:01 am: | 
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I recently bought an old wooden boat with a 3.5hp Chapman and Blaxland engine. The engine works like a dream. However I can't shift the clutch out of gear and the prop is always engaged. Any advice how to fix this would be great. |
Allenf
New member
Username: alf
Post Number: 3
Registered: 07-2015
| | Posted on Tuesday, March 01, 2016 - 05:17 pm: |
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The wedge slides up and down the tapered slot expanding the Dog Clutch to lock the propeller shaft in gear .
The wedge might be rusted/frozen hard to budge.
In my opinion it's better not to slip the clutch.
In or Out of gear is best with no unnecessary wear to the mechanism. |
Greg Y
Senior Member
Username: gregoryan
Post Number: 133
Registered: 09-2004
| | Posted on Tuesday, March 01, 2016 - 10:32 pm: |
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Anyone remember the ol' hireboats with No Clutch!? I s'pose they made em like this so in the event of a bad hirer - they would not be able to rev the engine full throttle - wondering why it's not moving forward - only then to Bang it into gear!
At one marina, Someone altered the hireboat sign over the boatshed, to read; " Drive Yourself Bats" ! |
Ross Cook
Visitor
| | Posted on Tuesday, March 01, 2016 - 11:18 pm: |
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can you post a pic to show if it does have a clutch and if so what type it is? |
Andrew Munns
Senior Member
Username: johnoxley
Post Number: 154
Registered: 04-2010
| | Posted on Tuesday, March 01, 2016 - 11:25 pm: |
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What you don't have, don't break down. Berowra hireboats had Hall engines with the lever/gear/sector start - Permanently coupled. This was normal. Most oldish ships and boats had reversing engines (steam and diesel) so solid coupled shafts were not considered that unusual. The Chapman/Blaxland clutch is simple, but does need to be kept clean and lubricated. It also needs to be kept free of salty bilge water. |
David Williams
New member
Username: davidywilliams
Post Number: 2
Registered: 02-2016
| | Posted on Wednesday, March 02, 2016 - 12:28 am: |
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Thanks for the advice. I'll have a closer look at the wedge.
Here's the engine and gear set up.
http://youtu.be/2oMRUOLRyOE |
Ross Cook
Visitor
| | Posted on Wednesday, March 02, 2016 - 12:41 am: |
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do you get any movement with the clutch handle, is it going backwards and forwards? |
Allenf
Member
Username: alf
Post Number: 4
Registered: 07-2015
| | Posted on Wednesday, March 02, 2016 - 05:14 pm: |
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Just looking at the youtube clip.
Try removing the block from behind the clutch leaver, it could be used to hold the leaver in place.
Some use a piece of rope to hold leaver in or out of drive. As the propeller spins it actually drives the whole shaft forward inside the dog clutch and into gear making it necessary to hold the leaver out of gear.
A firm hand is required on the dog clutch although don't rip the bottom out of the boat. |
