Reply
 
Thread Tools Search this Thread
 
Old 09 March 2016, 17:28   #11
Member
 
Country: UK - England
Town: Bideford
Make: Bombard Aerotec
Length: 4m +
Join Date: Aug 2014
Posts: 324
I've decided not to faff around and am planning on taking the engine apart to clean it properly. Anyone taken this one apart?
http://www.alamaula.com/a-barcos/flores/motor-mercury-force-3-hp/1001145339110910435091809

It's a force but it's really a tohatsu
__________________

__________________
simonafloat is offline   Reply With Quote
Old 11 March 2016, 04:03   #12
Member
 
Country: UK - England
Town: Bideford
Make: Bombard Aerotec
Length: 4m +
Join Date: Aug 2014
Posts: 324
Quote:
Originally Posted by simonafloat View Post
I've decided not to faff around and am planning on taking the engine apart to clean it properly. Anyone taken this one apart?
http://www.alamaula.com/a-barcos/flores/motor-mercury-force-3-hp/1001145339110910435091809

It's a force but it's really a tohatsu
Anyone? I am going to start taking it apart tonight and I don't want to undo more than I need to ! Cheers
__________________

__________________
simonafloat is offline   Reply With Quote
Old 11 March 2016, 05:50   #13
Member
 
Country: UK - England
Town: East Anglia
Boat name: Nimrod II
Make: Aerotec 380
Length: 3m +
Engine: Suzuki DF20 EFI
Join Date: Nov 2007
Posts: 3,278
So you've established yours is the type with the impellor on the prop.

The elements to the water flow are... The pump and impellor itself... the water feed pipe to the power head... the waterways in the power head.

You say you've checked the impellor end.

Sometimes taking off the lower gearcase and flushing up the pipe in the leg and back down from the pee hole alternately can have some success (with some sort of reducer on a garden hose but do not over pressurise).

However in my experience any deposits are often in the powerhead water jacket itself and flushing alone won't remove completely.

On my 4hp pictured a few posts above there was an exhaust side plate that gave access to the water jacket passages together with removing the head plate.

But on yours I think the only access is to remove the head where you will see the waterways which can be poked/flushed out. Then flush up from the impellor end of the pipe in the leg.

I have a manual that includes the 2hp which is near identical to the 3.3hp and I've attached two images of the alternative arrangements. The manual assumes you will want to remove the whole power head which involves removing the pull start and flywheel. I'd hope you will be able just to take the head section off.

So if it were me I'd take off the prop and impellor housing, take off the head, poke out deposits from the head water jacket waterways and flush up from the water pump end.

Obviously take huge care removing the head bolts to avoid snapping. Tapping hard on the bolt head, blowtorch heat & WD40... plus only moving half a turn... more W40 then turn out a bit more... and repeat to avoid disaster.
Attached Thumbnails
Click image for larger version

Name:	Mariner head.jpg
Views:	99
Size:	91.3 KB
ID:	111190   Click image for larger version

Name:	Mariner head2.jpg
Views:	93
Size:	90.9 KB
ID:	111191  
__________________
Fenlander is offline   Reply With Quote
Old 11 March 2016, 06:10   #14
Member
 
Country: UK - England
Town: Retford
Boat name: Spy-sea-one
Make: Mercury
Length: 3m +
Engine: Suzuki Outboard/25/4
MMSI: 235074042
Join Date: Oct 2011
Posts: 3,573
dont want to be a kill joy 20 year old engine taking head bolts out i know you said you dont want to faff around but if the head bolts shear you will wish you had.
you say you have low flow at low revs ok at high revs so why not run the engine with salt away to see if it improves.
one thing to consider your running in a bucket is there enough head on the pump for it to pick up enough water at low revs in other words the head of water assists the pump.
__________________
jeffstevens763@g is offline   Reply With Quote
Old 11 March 2016, 06:29   #15
Member
 
Country: UK - England
Town: East Anglia
Boat name: Nimrod II
Make: Aerotec 380
Length: 3m +
Engine: Suzuki DF20 EFI
Join Date: Nov 2007
Posts: 3,278
It's a fair point Jeff. I was happy to "gamble" on the bolts with my 30yr old Mariner 4 and it paid off... but it can go the other way.
__________________
Fenlander is offline   Reply With Quote
Old 11 March 2016, 06:41   #16
Member
 
Country: UK - England
Town: Retford
Boat name: Spy-sea-one
Make: Mercury
Length: 3m +
Engine: Suzuki Outboard/25/4
MMSI: 235074042
Join Date: Oct 2011
Posts: 3,573
its just he has flow all round so if it were me i would think its not that serious as it stands but i do know my suzuki would have water over the cav plate and not pump but give it two more inches and it was fine, and slow at tick over increasing with revs, now the 25 is different pumps well all the time. everything you have said spot on and may be it is a strip down in the end but i would faff a bit first before committing to a full blown stripdown.

cheers
__________________
jeffstevens763@g is offline   Reply With Quote
Old 11 March 2016, 11:26   #17
Member
 
Country: UK - England
Town: Bideford
Make: Bombard Aerotec
Length: 4m +
Join Date: Aug 2014
Posts: 324
Thanks for the advice guys. Since this morning I've come down with man flu so may not be doing anything at all this weekend.

Trying to salt away does sound worthwhile, where's the best supplier? If I'm going to get some I should definitely use it on my mariner 15. I see it comes in a kit with an in line hose pipe attachment, is it possible to just put some in the bucket? It'll have to wait for a few weeks as I literally don't have two pennies to rub together at the moment.

Up until recently I thought that flushing with fresh water after each use would be sufficient to keep an engine corrosion free.
__________________
simonafloat is offline   Reply With Quote
Old 11 March 2016, 13:42   #18
Member
 
Country: UK - England
Town: Retford
Boat name: Spy-sea-one
Make: Mercury
Length: 3m +
Engine: Suzuki Outboard/25/4
MMSI: 235074042
Join Date: Oct 2011
Posts: 3,573
Salt-away have an eBay shop Simon

Cheers
__________________
jeffstevens763@g is offline   Reply With Quote
Old 15 March 2016, 10:49   #19
Member
 
Country: UK - England
Town: Bideford
Make: Bombard Aerotec
Length: 4m +
Join Date: Aug 2014
Posts: 324
Ok well I went for it today and took the lower part of the leg off, followed by the power head. No problems with removing the 6 powerhead bolts. It was all very easy really.

There was a fair bit of salt and sand but no total blockages. I didn't remove the cylinder head. I cleaned out most of the salt and then reassembled the power head and reverse flushed through the tell tale using a steam cleaner. Worked a treat. Unfortunately I do need a new power head gasket before I can do it back up permanently. The existing one came right apart when I pulled the head off.

Having seen the inside of this little engine I would say that just regularly reverse flushing though the tell tale, perhaps with salt away, is all it should need.

Cheers for all your advice, she'll give 20 more years service I reckon

Simon
__________________
simonafloat is offline   Reply With Quote
Old 16 March 2016, 10:26   #20
Member
 
Country: UK - England
Town: Bideford
Make: Bombard Aerotec
Length: 4m +
Join Date: Aug 2014
Posts: 324
Quote:
Originally Posted by simonafloat View Post
Ok well I went for it today and took the lower part of the leg off, followed by the power head. No problems with removing the 6 powerhead bolts. It was all very easy really.

There was a fair bit of salt and sand but no total blockages. I didn't remove the cylinder head. I cleaned out most of the salt and then reassembled the power head and reverse flushed through the tell tale using a steam cleaner. Worked a treat. Unfortunately I do need a new power head gasket before I can do it back up permanently. The existing one came right apart when I pulled the head off.

Having seen the inside of this little engine I would say that just regularly reverse flushing though the tell tale, perhaps with salt away, is all it should need.

Cheers for all your advice, she'll give 20 more years service I reckon

Simon
Just a final question, while I wait for my new gasket to arrive. Does the gasket need bedding in on any kind of compound when I fit it? I can see that it's not subject to any great pressure but I don't want it leaking.
__________________

__________________
simonafloat is offline   Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search

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





Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -5. The time now is 01:42.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.