Reply
 
Thread Tools Search this Thread
 
Old 28 June 2015, 08:24   #11
Member
 
Country: UK - England
Town: cannock
Boat name: Harpoon
Make: Zodiac futura
Length: 3m +
Engine: 30 hp
Join Date: Jul 2014
Posts: 42
Engine

Hi fenlander
Iam looking at the same sort of area as you think . I can't do a lot more everything seems fine . I will do a compression test when I get back do you know what it should be (psi) and I will change the plugs .
I like a workshop manual for this engine it's a 30mshu 1996 I have had a look and managed to find on .
Regards Chris
__________________

__________________
harpo is offline   Reply With Quote
Old 28 June 2015, 08:38   #12
Member
 
Country: UK - England
Town: cannock
Boat name: Harpoon
Make: Zodiac futura
Length: 3m +
Engine: 30 hp
Join Date: Jul 2014
Posts: 42
Thanks do you know what the compression should be and have you any idea were I could get a manual for it ?
Thanks
__________________

__________________
harpo is offline   Reply With Quote
Old 28 June 2015, 09:14   #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: 3,276
Just search online or Ebay for manual... someone else may have more idea than me where to look.

Similarly I do not know the figures for your outboard but I'd be guessing compressions around 110psi. If you have a firing problem on one cylinder then the comparison between the two readings will give away any issue with one cylinder.
__________________
Fenlander is offline   Reply With Quote
Old 28 June 2015, 09:54   #14
Member
 
Country: UK - England
Town: cannock
Boat name: Harpoon
Make: Zodiac futura
Length: 3m +
Engine: 30 hp
Join Date: Jul 2014
Posts: 42
Cheers

Hello fenlander
That's great I will do that . Have good day and what left of the weekend
Regards chris
__________________
harpo is offline   Reply With Quote
Old 28 June 2015, 11:14   #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: 3,276
No problem... I hope someone else will post later as I might not have thought of everything.

As a matter of interest I'm checking over and servicing the Mercury 10hp 2-stroke I bought recently... its compression test made an identical 9bar (130.5psi) on each cylinder which was pleasing.

The gauge's reading hold valve lets by a little but it was exactly 9bar when the engine was pulled over.
Attached Thumbnails
Click image for larger version

Name:	Mercury XR10 compression test.jpg
Views:	49
Size:	104.2 KB
ID:	106435  
__________________
Fenlander is offline   Reply With Quote
Old 28 June 2015, 12:08   #16
Spammer
 
Country: Canada
Town: Southern Ontario
Boat name: -Unknown-
Make: SeaMax
Length: 4m +
Engine: Merc/Minn Kota
Join Date: Mar 2012
Posts: 216
When you say lumpy, that sounds as if the engine was at times missing. You say you found carbon build-up on one plug. Clean both plugs, re-gap and try again. After a few hours if running well, take the plugs out and inspect. If there is a build-up of black..do a compression check -- three types "Dry, Wet, Hot"..you can look up the differences. In total, each test type should be no-more than 10-14 lbs different from the other. If one is and it rises during the wet test..Rings, Reeds or other is the problem. Before spending money on a pump kit do the above first; also look for burn-marking on the plug high-tension wires as that means there's arching to ground before current gets to the plug. Good Luck
__________________

__________________
Nightfisher 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 23:10.


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