Reply
 
Thread Tools Search this Thread
 
Old 22 January 2010, 19:39   #1
Member
 
Country: UK - Wales
Town: Southampton
Boat name: DynaMoHumm/ SRV/deja
Make: Avon8.4, 5.4 & 4.777
Length: 8m +
Engine: Cat3126 Yam 90 &70
MMSI: 42
Join Date: Dec 2003
Posts: 6,556
overheated tohatsu

A while back I oveheated my 90 Tohatu ( Toohatso) very badly. despite months of trying to get it right it ain't right! I truly dont know much about boring out and oversized pistons so can anybody tell me what I can do I think it needs a rebore and bigger pistons . I have access to a sweet machinist with his own workshop who would be called my favourite Couzin Steve!
__________________

__________________
Here it comes again, I don't stand a chance
Soul possession, Got me in a trance
Pullin' me back to you - Deja Voodoo
Rogue Wave is offline   Reply With Quote
Old 23 January 2010, 06:59   #2
Member
 
spartacus's Avatar
 
Country: UK - Scotland
Town: Aberdeenshire
Boat name: Sula
Make: Ribcraft 4.8m
Length: 4m +
Engine: Tohatsu 60hp + aux
MMSI: 235087213
Join Date: Jun 2007
Posts: 3,270
RIBase
Got a couple of options here. Either try and source a new powerhead, or as suggested go for a rebore. If you opt for the rebore then you'll need new pistons. You may also need the crankshaft and conrods rebalanced. Depends if the engine siezed, number of hours, etc. The rebore itself involves boring, inserting a new cylinder core or sleeve, honing and polishing. Very specialised job and needs to be completed to factory tolerances. Do you know what caused the overheating - impeller/thermostat? Might be worth giving these guys a call, if nothing more than advice and a quote. http://cgi.ebay.co.uk/yamaha-outboar...item19b8c5aa2b
__________________

__________________
spartacus is offline   Reply With Quote
Old 24 January 2010, 10:44   #3
Member
 
spartacus's Avatar
 
Country: UK - Scotland
Town: Aberdeenshire
Boat name: Sula
Make: Ribcraft 4.8m
Length: 4m +
Engine: Tohatsu 60hp + aux
MMSI: 235087213
Join Date: Jun 2007
Posts: 3,270
RIBase
Quote:
Originally Posted by Rogue Wave View Post
A while back I oveheated my 90 Tohatu ( Toohatso) very badly. despite months of trying to get it right it ain't right! I truly dont know much about boring out and oversized pistons so can anybody tell me what I can do I think it needs a rebore and bigger pistons . I have access to a sweet machinist with his own workshop who would be called my favourite Couzin Steve!
Would you adam and eve it. http://cgi.ebay.co.uk/Tohatsu-80-90h...item1e5a230822
__________________
spartacus is offline   Reply With Quote
Old 24 January 2010, 14:42   #4
Member
 
Country: UK - England
Town: Essex/Vendee
Boat name: shockwave,Voluntry 2
Make: Pac 22/ searider5.4
Length: 6m +
Engine: 180hp turbo,yam 90
Join Date: Nov 2004
Posts: 1,015
A good link but looking at his other stuff he certainly knows how to charge
__________________
PeterR is offline   Reply With Quote
Old 24 January 2010, 16:02   #5
Member
 
spartacus's Avatar
 
Country: UK - Scotland
Town: Aberdeenshire
Boat name: Sula
Make: Ribcraft 4.8m
Length: 4m +
Engine: Tohatsu 60hp + aux
MMSI: 235087213
Join Date: Jun 2007
Posts: 3,270
RIBase
Quote:
Originally Posted by PeterR View Post
A good link but looking at his other stuff he certainly knows how to charge
True, but a 90hp Tohatsu block and running gear don't come up that often. I suppose the seller could be open to offer. If you had a Fiat Punto - you'd be sorted. He's got enough spare parts to practically rebuild one!
__________________
spartacus 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 02:11.


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