Reply
 
Thread Tools Search this Thread
 
Old 29 September 2014, 16:03   #1
Member
 
Country: UK - England
Town: portsmouth
Boat name: patch
Make: avon sr5.4/4m
Length: 5m +
Engine: mercury 90/honda 30
Join Date: Oct 2008
Posts: 259
Turbo questions !!

Just a couple of quick questions before I buy a new one !! Would play in a turbo shaft bearing cause the turbo to not boost, and could my tappets being a little loose cause the turbo not to boost !! I've tried googling it and no answers so need a little help before I spend a small fortune on a new one ??
__________________

__________________
tim2658 is offline   Reply With Quote
Old 29 September 2014, 16:07   #2
Member
 
Country: UK - England
Town: Mighty Penryn
Boat name: Little Joe.
Make: Avon Searider
Length: 4m +
Engine: Honda BF50
Join Date: Aug 2005
Posts: 8,841
No and no.

If the turbo isn't spooling up, chances are that its seized.

What's this turbo attached to?
__________________

__________________
Mollers is offline   Reply With Quote
Old 29 September 2014, 16:21   #3
Member
 
Festinghouse's Avatar
 
Country: UK - England
Town: Chorley / Holyhead
Boat name: Northwind Challenger
Make: Tornado
Length: 6m +
Engine: Mariner 115 efi CT
MMSI: 235080598
Join Date: Jun 2011
Posts: 1,398
RIBase
Send a message via Skype™ to Festinghouse
if there is enough play in the shaft, could the 'blades' not be touching the sides of the turbo thereby stopping it turning properly? also if the bearings are worn, could it be possible that there are other worn parts causing it not to boost. and no i dont reckon tappets would have any effect on what the turbo does.
__________________
"Life may often suck, but the alternative is unacceptable"
MMSI Sticker

Member of S.A.B.S. (Lancashire Division)
Festinghouse is offline   Reply With Quote
Old 29 September 2014, 16:26   #4
Member
 
Country: UK - England
Town: Mighty Penryn
Boat name: Little Joe.
Make: Avon Searider
Length: 4m +
Engine: Honda BF50
Join Date: Aug 2005
Posts: 8,841
Quote:
Originally Posted by Festinghouse View Post
if there is enough play in the shaft, could the 'blades' not be touching the sides of the turbo thereby stopping it turning properly? also if the bearings are worn, could it be possible that there are other worn parts causing it not to boost
Whateva, it's f'kd.
__________________
Mollers is offline   Reply With Quote
Old 29 September 2014, 16:29   #5
Member
 
Country: UK - Scotland
Town: north ayrshire
Boat name: charlie girl
Make: reiver 3.8/regal3760
Length: 10m +
Engine: 40hp 2st 2x6lp 315
Join Date: Jul 2009
Posts: 1,498
What engine is it fitted to would be a big help.
With the engine stopped & the air filter removed you should be able to spin the shaft with your fingers. There should be a little lift in the shaft
If it rattles up & down then it's knackered
The shaft should centralise once spinning as the shaft runs on the wedge of oil rather than the bearings
__________________
beamishken is offline   Reply With Quote
Old 29 September 2014, 16:32   #6
Member
 
biffer's Avatar
 
Country: UK - England
Town: swanwick/hamble
Boat name: stormchaser
Make: custom rib
Length: 8m +
Engine: inboard/diesel
Join Date: Aug 2007
Posts: 3,848
Take the air filter off and see if it's spinning when the engine is running. Have you a vacuum waste gate fittied
__________________
biffer is offline   Reply With Quote
Old 29 September 2014, 17:34   #7
Member
 
Country: UK - England
Town: portsmouth
Boat name: patch
Make: avon sr5.4/4m
Length: 5m +
Engine: mercury 90/honda 30
Join Date: Oct 2008
Posts: 259
Sorry guys meant to say it's on a ford mermaid in my pacific, on idle I can hear to spin up, and if I run it on the trailer it throws out black smoke and sounds like it working but soon as I launch it and under load I have no turbo !! The shaft moves about 1-2mm side to side !!
__________________
tim2658 is offline   Reply With Quote
Old 29 September 2014, 17:43   #8
Member
 
Country: UK - Scotland
Town: Bishopton Scotland
Boat name: Seewizz
Make: Coastline 7.0mtr
Length: 7m +
Engine: Volvo D3 160 SX
Join Date: Feb 2001
Posts: 55
Sounds like a seized waste gate, just like you get on the small 1.7 merc
__________________
calum mckenzie is offline   Reply With Quote
Old 29 September 2014, 17:44   #9
Member
 
Country: UK - England
Town: portsmouth
Boat name: patch
Make: avon sr5.4/4m
Length: 5m +
Engine: mercury 90/honda 30
Join Date: Oct 2008
Posts: 259
It's a real basic set up and I'm sure there's no waste gate fitted !!
__________________
tim2658 is offline   Reply With Quote
Old 29 September 2014, 17:50   #10
Member
 
Country: UK - Scotland
Town: north ayrshire
Boat name: charlie girl
Make: reiver 3.8/regal3760
Length: 10m +
Engine: 40hp 2st 2x6lp 315
Join Date: Jul 2009
Posts: 1,498
Quote:
Originally Posted by tim2658 View Post
Sorry guys meant to say it's on a ford mermaid in my pacific, on idle I can hear to spin up, and if I run it on the trailer it throws out black smoke and sounds like it working but soon as I launch it and under load I have no turbo !! The shaft moves about 1-2mm side to side !!
that much lift isn't a problem sounds like you have a loss of turbo pressure elsewhere

is it wastegated? if so check that the wastegate isn't stuck open or the valve burnt away also check for air leaks in the system after the turbo.

exhaust elbows can corrode & restrict the gas flow out of the exhaust

what makes you say you have no turbo? is it smoking heavily as you try to accelerate? you mention smoking on the trailer but not when trying to get the boat planeing, doesn't the mermaid have an enrichment device on the pump which measures turbo pressure & adjusts the pump as required? can you get a guage to check the manifold pressure?
could it be something else restricting the engines performance?
__________________

__________________
beamishken 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 18:11.


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