Go Back   RIBnet Forums > RIB talk > Engines & props
Click Here to Login

Reply
 
Thread Tools Search this Thread
 
Old 10 June 2013, 11:54   #1
Member
 
Country: UK - England
Town: Hertfordshire, UK.
Make: Avon
Length: 3m +
Engine: Yamaha,Chrysler 4.5
Join Date: May 2013
Posts: 25
Chrysler 4.5hp 1970's flywheel issue

'Issue' meaning I can't get it off....

This is on a very clean engine that has been looked after.

I've loosened the nut, had a properly fitted puller on it with a bit of pressure, and also done the usual tap on the top, and still it refuses to budge.
Heat gun on the wheel, WD40 down the keyway, all failed.

Has anyone got any ideas? The only reason it has to come off is to fit a kill cord, and all the electrics are inside. The engine runs fine, but I'm at the point now, (bearing in mind that if anything breaks the engine will be scrap), that it'll have to be used without a kill cord until it starts running bad due to points problems.



__________________
Brady is offline   Reply With Quote
Old 10 June 2013, 13:24   #2
Member
 
Country: UK - Wales
Town: Here
Boat name: doggypaddle
Make: Avon 5.4 Searider
Length: 5m +
Engine: yamaha 80
Join Date: Jul 2007
Posts: 1,107
Replace "bit of pressure" with a "lot of pressure" , and "a tap" with "a big sharp whallop" from a copper hammer straight on top of the puller. Leave the nut on or it may take your teeth out as it flys off

They can get really tight, puller helps but its the shockwave fron a hammer that will "break" the taper
Make sure the puller is on the centra of the crank, not bearing on the nut, or you could feck the crank threads.
penetrating fluid is usually no help as ther won,t actually be a gap for it to penetrate, because the taper is that snug a fit.
__________________
I am usually not as green as i am cabbage looking.
doggypaddle is offline   Reply With Quote
Old 10 June 2013, 13:33   #3
Member
 
Country: UK - England
Town: Hertfordshire, UK.
Make: Avon
Length: 3m +
Engine: Yamaha,Chrysler 4.5
Join Date: May 2013
Posts: 25
puller pressure..

I tightened the puller as far as I dare, and gave the top puller screw a good whelt with a copper/hide mallet.
Thanks for yoir reply.. i'll have to try another day with more bottel, but as i say I didn't want a damaged and then written off engine..
Regards
__________________
Brady is offline   Reply With Quote
Old 10 June 2013, 14:20   #4
Member
 
Country: Netherlands
Town: Deventer
Boat name: .
Make: Avon
Length: 6m +
Engine: outboard
Join Date: Apr 2008
Posts: 102
Superb outboard.
Love listening to the sound that one makes!

When it doesn't come off in the way Doggypaddle said:
Make shure you use the right puller: Don't use an 2 or 3-arm puller type, but use a solid steelplate with holes in it and a big fine central thead bolt whichs goes on the cranckase. Connect the puller bij using the (i think) 5/16NC holes in the flywheel.

Leave the flywheel nut on the crankase, just loosen it 1/2 turn from fully fixed..
Then take the biggest steel hammer you've got around, (min 0,5kg) and give it a really good hit. Make sure to hit it straitgh from above and not from the side, not to damage. When it doesn't come off this way, it doe'sn't at all anymore..

Good luck!!
__________________
J.W.W. is offline   Reply With Quote
Old 10 June 2013, 15:45   #5
Member
 
Country: UK - Wales
Town: Here
Boat name: doggypaddle
Make: Avon 5.4 Searider
Length: 5m +
Engine: yamaha 80
Join Date: Jul 2007
Posts: 1,107
Should have mentioned that, I assumed that a non hydraulic puller was being used on the UNC holes.
I suppose you can whack a hydraulic puller but it would prolly feck it up!!
__________________
I am usually not as green as i am cabbage looking.
doggypaddle is offline   Reply With Quote
Old 10 June 2013, 15:52   #6
Member
 
Country: UK - England
Town: Hertfordshire, UK.
Make: Avon
Length: 3m +
Engine: Yamaha,Chrysler 4.5
Join Date: May 2013
Posts: 25
Flywheel

There aren't any holes to screw the puller to...just a conventional puller with claws will have to suffice.
__________________
Brady is offline   Reply With Quote
Old 10 June 2013, 20:17   #7
Member
 
Country: UK - Wales
Town: Here
Boat name: doggypaddle
Make: Avon 5.4 Searider
Length: 5m +
Engine: yamaha 80
Join Date: Jul 2007
Posts: 1,107
so what are the 3 holes at 120 degree spacing around the centre bolt then?

are they not threaded?

I would be very cautious with a 3 legged puller on the flywheel periphery, you may get half the flywheel off!
__________________
I am usually not as green as i am cabbage looking.
doggypaddle is offline   Reply With Quote
Old 10 June 2013, 20:29   #8
Member
 
Country: UK - England
Town: Hertfordshire, UK.
Make: Avon
Length: 3m +
Engine: Yamaha,Chrysler 4.5
Join Date: May 2013
Posts: 25
Quote:
Originally Posted by doggypaddle View Post
so what are the 3 holes at 120 degree spacing around the centre bolt then?

are they not threaded?

I would be very cautious with a 3 legged puller on the flywheel periphery, you may get half the flywheel off!
The three holes are where I've taken the manual cord start plate off. Its the drive for the plate to lock to the flywheel..
Would be handy if they were threaded...
__________________
Brady is offline   Reply With Quote
Old 10 June 2013, 21:29   #9
Member
 
Country: UK - Wales
Town: Here
Boat name: doggypaddle
Make: Avon 5.4 Searider
Length: 5m +
Engine: yamaha 80
Join Date: Jul 2007
Posts: 1,107
Ram a tap down em
__________________
I am usually not as green as i am cabbage looking.
doggypaddle is offline   Reply With Quote
Old 10 June 2013, 21:49   #10
Member
 
Country: UK - England
Town: Hertfordshire, UK.
Make: Avon
Length: 3m +
Engine: Yamaha,Chrysler 4.5
Join Date: May 2013
Posts: 25
Quote:
Originally Posted by doggypaddle View Post
Ram a tap down em
Good plan, but sadly too shallow..

I think I'll have another go next week-- with a little more oomph. I've a h-bar type kill switch on way now and would like it on really. I've a 9 & 11 yr old looking for a turn... Supervised of course.

Im going to be looking for an 8hp soon, so may part with the Chrysler and don't want it messed up for no real reason though.
__________________
Brady is offline   Reply With Quote
Reply


Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off




All times are GMT. The time now is 03:05.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2024, vBulletin Solutions, Inc.