Reply
 
Thread Tools Search this Thread
 
Old 31 October 2014, 16:14   #1
Member
 
Country: UK - Scotland
Boat name: Wildheart
Make: Humber/Delta Seasafe
Length: 5m +
Engine: Merc 60 Clamshell
MMSI: 235068449
Join Date: Apr 2007
Posts: 4,610
Johnson / Evenrude mid 90s 5/6/8 stoke - Inlet Manifold Photo

In a sentence - anyone got one I could have a look at? (or have one (any HP) they could take a pic of?)

Just to save me taking the whole thing to bits to check out a theory!

Thanks in advance
__________________

__________________
9D280 is offline   Reply With Quote
Old 31 October 2014, 16:30   #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
What you want to know?
__________________

__________________
Davie is offline   Reply With Quote
Old 31 October 2014, 22:40   #3
Member
 
Peter_C's Avatar
 
Country: USA
Boat name: Uh...a kayak?
Length: 4m +
Join Date: Dec 2009
Posts: 1,485
There are plenty of photos available on the internet. See link below.

https://www.google.com/search?q=1990...w=1280&bih=647
__________________
Peter_C is offline   Reply With Quote
Old 04 November 2014, 17:37   #4
Member
 
Country: UK - Scotland
Boat name: Wildheart
Make: Humber/Delta Seasafe
Length: 5m +
Engine: Merc 60 Clamshell
MMSI: 235068449
Join Date: Apr 2007
Posts: 4,610
Quote:
Originally Posted by Davie View Post
What you want to know?
Whether I'm looking to replace it or simply bore / file / cut it out to 8Hp cross sectional area! (Having crawled the parts lists I reckon this "manifold" doubles as a restrictor in the smaller HPs.

Quote:
Originally Posted by Peter_C View Post
There are plenty of photos available on the internet. See link below.

https://www.google.com/search?q=1990...w=1280&bih=647
Yeah, the exploded pics are OK, but don't show the detail I need!
__________________
9D280 is offline   Reply With Quote
Old 04 November 2014, 18:41   #5
RIBnet supporter
 
bartiny's Avatar
 
Country: UK - England
Town: Accrington
Length: no boat
Join Date: Oct 2012
Posts: 451
I assume that you want to convert a 6hp to 8hp, This might have the info you need, looks like just a carb change? (which is the norm)

Johnson

__________________
bartiny is offline   Reply With Quote
Old 05 November 2014, 08:20   #6
Member
 
Country: UK - Scotland
Boat name: Wildheart
Make: Humber/Delta Seasafe
Length: 5m +
Engine: Merc 60 Clamshell
MMSI: 235068449
Join Date: Apr 2007
Posts: 4,610
Bartiny,

In a word - yes. I reckoned that if I'm hanging this on my transom as an aux, I might as well make full use of it's lardiness and have a wee bit extra grunt to spare for that big wind / lee shore scenario....

From the parts lists I've been scouring it would appear to only be the "manifold" and the main jet / carrier need changed. - Makes sense as all the throttle mechanism etc is unchanged, so WOT is WOT W.R.T. the spark, (the "fix it" manual doesn't show any differnet spark advance settings either) and I think all they've done is restrict it with a smaller jet & lump of metal they call "manifold".
__________________
9D280 is offline   Reply With Quote
Old 05 November 2014, 12:53   #7
RIBnet supporter
 
bartiny's Avatar
 
Country: UK - England
Town: Accrington
Length: no boat
Join Date: Oct 2012
Posts: 451
Not sure if this helps.

Upgrade 6hp to 8hp - Johnson Outboard Forum

__________________
bartiny is offline   Reply With Quote
Old 05 November 2014, 15:07   #8
Member
 
Country: UK - Wales
Town: abergele
Boat name: all mine
Make: ribtec 3m
Length: 3m +
Engine: tohatsu 9.8 hp 2st
Join Date: Sep 2012
Posts: 275
I had both outboards a year or so ago, I belive it's only the 1983 model 6HP that can be uprated, the reed valves are diffrent two leaves on the 6HP and three on the 8HP, I did notice the inlet between the carb and reeds on the 6HP was smaller and slightly of set compared to the 8hp, you will also have to adjust the timeing to allow for the larger inlet, the diffrence between the 6 and 8 was not worth the hassel, there is a site "leeroy's rambelings", the guy seems to know his stuff so I emailed him and he told me not to bother, hope this helps.
__________________
slate1234 is offline   Reply With Quote
Old 05 January 2015, 18:05   #9
Member
 
Country: UK - Scotland
Boat name: Wildheart
Make: Humber/Delta Seasafe
Length: 5m +
Engine: Merc 60 Clamshell
MMSI: 235068449
Join Date: Apr 2007
Posts: 4,610
Ok, its been a wee while since I posted this & the engine has been sitting staring at me every time I go into the garage for the last 2 months. I think some of the replies above may be for an earlier model than mine, as mine is of the 5-6-8 Hp type of (I think) 1997/9 ish but..... tonight I discovered one of the pleasures of buying ex hire stuff!

Under closer examination, the "manifold" looked in better nick paint wise than the rest - so had it been replaced already? a closer look turns out the PN on the "manifold" casting is for the 6HP, and not the 5 the cowl proclaims it to be!

I then find under further examination that the throttle cam follower doesn't appear to be going all the way to the end of the cam - the spark advance plate is stopped a few degrees short of the roller hitting the top of the cam by a big lump of metal poking out the top of the manifold casting. I suspect 5 mins with a coarse file will allow it to go all the way & fully open the throttle. Also explains the one ignition system part number - it's physically restricted rather than electronically, and the power kept down by retarded spark.

I'm off to revisit the manual, as filing off too much will bring it out in sympathy with the Merc...
__________________

__________________
9D280 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 08:44.


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