| Author |
Message |
    
Clarrie Beckingham
New member
Username: beckinc
Post Number: 1
Registered: 10-2008
| | Posted on Sunday, November 02, 2008 - 07:57 pm: | 
|
Hi Anyone any suggestion on tightness of nuts on engine bed bolts for 3.5HP Blaxlnd Chapman motor. They became a bit loose so I have tightened them up to reduce play |
Todd Vidgen
Senior Member
Username: todd_vidgen
Post Number: 99
Registered: 03-2008
| | Posted on Sunday, November 02, 2008 - 10:48 pm: |
|
Tight as possible,but dont strip the threads
If the motor has come loose you will have to
realign it otherwise you will damage the crank,
clutch assy,prop shaft,and stern glands.
If they have become loose ,it is for a reason
1 timber in beds rotten or soft
2 Misalignment between engine and shaft
3 Wear in parts generating vibration
4 Fatigue in the fastens themselves
5 corrosion either in the engine base plate
or the fasteners
Remember only a max of 0.004' discrepancy
allowed between the coupling faces |
Bruce Findlay
Advanced Member
Username: bruce_findlay
Post Number: 46
Registered: 03-2006
| | Posted on Sunday, November 02, 2008 - 10:57 pm: |
|
Hi Todd,
Yeah! I've got the same problem, one of the many things I have to fix before my boat can get back into the water. Sorry for missing the regatta, sounds like it was a success. Looking at the photo's though, my poor old working boat would look a bit out of place amongst all of the "gentlemen's launches" 
Bruce. |
John Wagemans
Member
Username: narrau
Post Number: 8
Registered: 02-2008
| | Posted on Monday, November 03, 2008 - 04:39 am: |
|
where do u find the pics of the Davistown regatta? |
Ian
Member
Username: the_bigfella
Post Number: 9
Registered: 10-2008
| | Posted on Monday, November 03, 2008 - 05:52 am: |
|
John - there is a section called "shows" - they are in there
http://www.oldmarineengine.com/discus/messages/3428/118624.html
btw - we dummy mounted the Pup I bought off you the other day - discovered today that they guy who built the hull had stretched it too - 4.5m not 4.26.... |
Todd Vidgen
Senior Member
Username: todd_vidgen
Post Number: 100
Registered: 03-2008
| | Posted on Monday, November 03, 2008 - 03:43 pm: |
|
I dunno Bruce,the more the merrier,their were a
few with added patina there.Besides which some
boats have features and fittings which have that
"little something"that comes with age and use that
although very beautiful,some of the newer,restored
vessels never quite have |
Clarrie Beckingham
New member
Username: beckinc
Post Number: 2
Registered: 10-2008
| | Posted on Tuesday, November 04, 2008 - 03:13 pm: |
|
Hi Todd,
Many thanks for your advice.I dont think the looseness was due to any of the 5 points you listed ,but rather to having "putted" around for the last 30yrs, the nuts loosened gradually.I have tightened them up firmly and added another nut to each bolt to lock the situation down.I will keep a sharp eye out for any untoward developments with motor/clutch etc |
