Reply
 
Thread Tools Search this Thread
 
Old 03 May 2016, 12:13   #1
Member
 
Country: UK - England
Town: Bournemouth
Boat name: Lucky Heather
Make: Whaly
Length: 4m +
Engine: 30hp Mariner
Join Date: Mar 2015
Posts: 93
RIBase
New Gaskets blowing on intake manifold, yam mariner 30hp

Yet another problem with my dam engine, So far I have rebored and replaced pistons, rings, all gaskets, stator, cdi and coil so its pretty much a new engine.

The latest problem I have (new day new problem) is that it won't start because the intake manifold gasket is failing and losing compression and fuel out the side. The engine has really good compression but its too much for the gasket.

Should I cut one of my own, the failure is on the bottom lefthand side.

Heres the breakdown 30A Mariner Outboard 689-550101 AND UP INTAKE MANIFOLD Diagram and Parts

part 18 - 80569M

I'm in to deep to scrap the engine, so what can I do? It has run since the rebuild.
__________________

__________________
papajoe is offline   Reply With Quote
Old 03 May 2016, 12:29   #2
Member
 
Country: UK - Scotland
Town: wormit
Boat name: lots of them
Make: various
Length: no boat
Engine: all types
Join Date: Dec 2004
Posts: 388
Have you got the bolts mixed up and they are bottoming out?
__________________

__________________
Davie is offline   Reply With Quote
Old 03 May 2016, 12:36   #3
Member
 
Country: UK - England
Town: Bournemouth
Boat name: Lucky Heather
Make: Whaly
Length: 4m +
Engine: 30hp Mariner
Join Date: Mar 2015
Posts: 93
RIBase
Nope, double checked bolts all look good and correct, had it off 3 times today, all cleaned and replaced with a new gasket I picked up down the road. The new one was blowing within 20 seconds of cranking it over? Driving me mad would be an under statement!
__________________
papajoe is offline   Reply With Quote
Old 03 May 2016, 13:10   #4
Member
 
A1an's Avatar
 
Country: UK - Scotland
Town: Fort William
Make: Humber Destroyer
Length: 5m +
Engine: Yamaha F80
Join Date: Mar 2012
Posts: 2,239
RIBase
Have you got a picture of the mating surface?
__________________
There is a place on this planet for all of Gods creatures.........right next to my tatties and gravy.
A1an is offline   Reply With Quote
Old 03 May 2016, 14:37   #5
Member
 
Country: UK - England
Town: Bournemouth
Boat name: Lucky Heather
Make: Whaly
Length: 4m +
Engine: 30hp Mariner
Join Date: Mar 2015
Posts: 93
RIBase
Ok, removed bolts ome by one and added a washer behind them just in case, started it and same issue so stripped it again and the problem is staring me in the face. Even though it's a yam made mariner 689 and all parts are interchangeable, it appears that the profile of the intake of the crankcase is very slightly different between both models. in the very bottom left the yam/mariner casing is straighter than the yam gasket (hard to get mariner one) and there's the problem a little gap of 4mm. Bugger!!!
__________________
papajoe is offline   Reply With Quote
Old 06 May 2016, 06:04   #6
Member
 
Country: UK - England
Town: Bournemouth
Boat name: Lucky Heather
Make: Whaly
Length: 4m +
Engine: 30hp Mariner
Join Date: Mar 2015
Posts: 93
RIBase
ha ha ha ha, this is why I love secondhand outboards, fixed the air leak and couldn't work out why it wasn't starting. The bloody woodruff key had split in half and moved the timing out! Anyway started first time, ran lovely and now shat a bearing. Time for a tear down again!!!!
__________________
papajoe is offline   Reply With Quote
Old 09 May 2016, 01:16   #7
Member
 
Fstarocka's Avatar
 
Country: South Africa
Town: Cape Town
Length: 4m +
Engine: Mariner 60 3cyl 2str
Join Date: Jan 2016
Posts: 90
Oh my.. Well was in the same boat with a motorbike last week.. Three top end head gasket jobs oil and water mixing, previous owner had half unscrewed three of the 5 core plugs!! I JUST saw the bubble as I bent down to pick up a tool.. Was about to tear the whole motor down!!

Screaming now at last! Not only boats trust me!

Sent from my SM-G900M using Tapatalk
__________________
Fstarocka is offline   Reply With Quote
Old 09 May 2016, 06:54   #8
Member
 
Country: UK - England
Town: Bournemouth
Boat name: Lucky Heather
Make: Whaly
Length: 4m +
Engine: 30hp Mariner
Join Date: Mar 2015
Posts: 93
RIBase
Good to see others suffer as well
__________________
papajoe is offline   Reply With Quote
Old 09 May 2016, 07:34   #9
Member
 
Fstarocka's Avatar
 
Country: South Africa
Town: Cape Town
Length: 4m +
Engine: Mariner 60 3cyl 2str
Join Date: Jan 2016
Posts: 90
Haha yes indeed.. Comes with the territory lol

Sent from my SM-G900M using Tapatalk
__________________

__________________
Fstarocka 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 21:49.


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