#1  
Old 08-04-2012
wizard wizard is offline
 
Join Date: Apr 2012
Location: Isle of Wight
Posts: 3
Thanks: 7
Thanked 0 Times in 0 Posts
Unhappy Mariner 75

Just need a little direction, I have little understandings of engines and been rip off a few time with people who say they know about engines, so I'm hoping for a bit of advice from anyone. I have an oldish Mariner 75hp, that up to Friday has been fine, I was traveling at about 6mph when I heard a large clump, first I thought I had hit bottom but this was not the case as prop was fine and dept finder, showing plenty of water, the engine was very hot, I had oil in and when I left the harbour it was showing, that it was pumping a good amount of water through.
I have checked the prop which rotated when out of gear, when in gear it will only allow me to move the prop so far one way and back again, we manage to free it a little when I took cover off to see it I could move top with a large socket again it allowed me to turn it 3/4 away around and back again, I was told the piston were moving, we also took the plugs whilst we done this, when we tried to restart with key it would just turn the engine the 3/4 of the way around, before I pay out on this, has anyone got any idea.
Reply With Quote
  #2  
Old 08-04-2012
Russ T Hinge's Avatar
Russ T Hinge Russ T Hinge is offline
veteran
 
Join Date: Oct 2008
Location: head in the clouds
Posts: 6,788
Thanks: 3
Thanked 1,369 Times in 1,046 Posts
Default

When in gear the prop should only move in one direction, it would not be of much use were that not the case, it can be moved very slightly in the other but not much.
After the noise did the engine stop ?
__________________
I do not, do...if's... buts... or maybe's !
If you,re busy doing nothing...........how do you know when you,ve finished ?
You can only be certain of three things....Tax...death and RTH !...
WARNING....Russ T is a hazard to himself let alone others so any advice he offers is to be treated with suspicion and acted upon at your own risk !!!!!....
Reply With Quote
The Following User Says Thank You to Russ T Hinge For This Useful Post:
wizard (09-04-2012)
  #3  
Old 08-04-2012
alana alana is offline
veteran
 
Join Date: Aug 2008
Location: guernsey.
Posts: 1,007
Thanks: 22
Thanked 193 Times in 164 Posts
Default

if you cant turn the flywheel freely ;out of gear; the motor has internal damage.
Reply With Quote
The Following User Says Thank You to alana For This Useful Post:
wizard (09-04-2012)
  #4  
Old 08-04-2012
Russ T Hinge's Avatar
Russ T Hinge Russ T Hinge is offline
veteran
 
Join Date: Oct 2008
Location: head in the clouds
Posts: 6,788
Thanks: 3
Thanked 1,369 Times in 1,046 Posts
Default

You say it has oil therefor I assume it is a four stroke ?, from your post I would say a valve has dropped.........
__________________
I do not, do...if's... buts... or maybe's !
If you,re busy doing nothing...........how do you know when you,ve finished ?
You can only be certain of three things....Tax...death and RTH !...
WARNING....Russ T is a hazard to himself let alone others so any advice he offers is to be treated with suspicion and acted upon at your own risk !!!!!....
Reply With Quote
The Following User Says Thank You to Russ T Hinge For This Useful Post:
wizard (09-04-2012)
Old 08-04-2012
JPM's Avatar
JPM JPM is offline
admin
 
Join Date: Jul 2008
Location: LINCOLNSHIRE
Posts: 1,907
Thanks: 167
Thanked 603 Times in 382 Posts
Default

The first thing I would do is drop the leg and check how the prop turns when free of the power head , if it runs fine in gear then I think your next job will be to remove the head and have a look at the pistons


PS welcome to the forum ,,,,,,,,,
__________________
I DIDN'T KNOW WHAT HAPPINESS WAS LIKE TILL I GOT MARRIED !!!!!!!
NOW I DON'T HALF MISS IT




Méfiez-vous des huards ......
Reply With Quote
The Following User Says Thank You to JPM For This Useful Post:
wizard (09-04-2012)
  #6  
Old 08-04-2012
Russ T Hinge's Avatar
Russ T Hinge Russ T Hinge is offline
veteran
 
Join Date: Oct 2008
Location: head in the clouds
Posts: 6,788
Thanks: 3
Thanked 1,369 Times in 1,046 Posts
Default

Take off the rocker cover and check the valve train it may be a broken cambelt ?, then remove the plugs and engage the services of a good torch.......
__________________
I do not, do...if's... buts... or maybe's !
If you,re busy doing nothing...........how do you know when you,ve finished ?
You can only be certain of three things....Tax...death and RTH !...
WARNING....Russ T is a hazard to himself let alone others so any advice he offers is to be treated with suspicion and acted upon at your own risk !!!!!....
Reply With Quote
The Following User Says Thank You to Russ T Hinge For This Useful Post:
wizard (09-04-2012)
  #7  
Old 08-04-2012
wizard wizard is offline
 
Join Date: Apr 2012
Location: Isle of Wight
Posts: 3
Thanks: 7
Thanked 0 Times in 0 Posts
Default

Its a 2 stroke engine, it did just stop, I shall take it off this week and get someone to look at it from the club I belong too, thanks to everyone who took the time to reply.
I think I might have to look at another engine, I needed a smaller and newer one, but I didn't want to replace it just yet. More worried about telling the Miss:
Reply With Quote
Old 08-04-2012
JPM's Avatar
JPM JPM is offline
admin
 
Join Date: Jul 2008
Location: LINCOLNSHIRE
Posts: 1,907
Thanks: 167
Thanked 603 Times in 382 Posts
Default

The same happened to mine last year . My outboard started to slow down then stopped with a clunk , the slowing down was one of the bigend bearings disintegrating, the sudden stop was when a bit of the bearing got stuck between the exhaust port lip and the top of the piston , This is what I found when I took the head off mine
To cut a long story short I fixed my outboard , and it is now running fine, most of the spare parts I got off ebay ,



full story starts post 494 HERE
PS welcome to the forum

__________________
I DIDN'T KNOW WHAT HAPPINESS WAS LIKE TILL I GOT MARRIED !!!!!!!
NOW I DON'T HALF MISS IT




Méfiez-vous des huards ......
Reply With Quote
The Following User Says Thank You to JPM For This Useful Post:
wizard (09-04-2012)
  #9  
Old 09-04-2012
alana alana is offline
veteran
 
Join Date: Aug 2008
Location: guernsey.
Posts: 1,007
Thanks: 22
Thanked 193 Times in 164 Posts
Default

did the oldish mariner 75s have a cylinder head that could be removed. mine circa 1989[date could be way out] was blind bored
Reply With Quote
The Following User Says Thank You to alana For This Useful Post:
wizard (09-04-2012)
  #10  
Old 09-04-2012
wizard wizard is offline
 
Join Date: Apr 2012
Location: Isle of Wight
Posts: 3
Thanks: 7
Thanked 0 Times in 0 Posts
Unhappy 75 Mariner

This is the only photo I got of the engine, I am only guessing the year, from info that I had when I brought the boat may be later( engine number 4322943) but I'll get a couple tomorrow of it and post it then.

When we tried to turn it, we removerd a black cover that was protecting a round disc with a large bolt in middle, this may be what you were talking about?
Attached Thumbnails
DSC_0613.jpg  
Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may post new threads
You may 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

Forum Jump


All times are GMT +1. The time now is 02:44.


Powered by vBulletin® Version 3.8.0
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
This site and its contents copyright 2008 onwards to PracticalBoating.com and Friday Holdings Ltd

Ad Management by RedTyger