Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 10-09-2014, 07:17   #16
Senior Cruiser
 
Kenomac's Avatar

Cruisers Forum Supporter

Join Date: Jan 2012
Location: Somewhere in the Adriatic Sea
Boat: Oyster 53 Cutter
Posts: 8,511
re: Diesel Struggles Under Load

One more very important bit to consider that nobody's mentioned. If you clear something from the prop like rope or growth, you can't test your engine for higher revs while it's tethered to the dock, you'll need to take it out into open water. Tied to the dock, your engine will only rev part way due to increased resistance. The boat needs to travel through the water in order to rev the engine higher under load. Tied to the dock, it will struggle like it's trying to move the dock... which is exactly what it's trying to do.

Good luck.
__________________

__________________
Kenomac is offline   Reply With Quote
Old 10-09-2014, 07:33   #17
Registered User

Join Date: Mar 2010
Location: Wandering around North America
Boat: Defever 43 - Gray Hawk
Posts: 602
re: Diesel Struggles Under Load

I vote for the governor. It's load related which for me rules out exhaust. If there's no fuel or air restrictions then the governor is the next likely culprit.

R.J.(Bob) Evans
www.travellingwithgeorge.blogspot.com
__________________

__________________
R.J.(Bob) Evans
M/V Gray Hawk, 43 Defever Offshore Cruiser
http://www.bobandmarilyn.ca
bobofthenorth is offline   Reply With Quote
Old 10-09-2014, 07:53   #18
Marine Service Provider

Join Date: Jan 2014
Posts: 49
re: Diesel Struggles Under Load

When cleaning the prop did it turn easy in neutral?
__________________
CptLawrence is offline   Reply With Quote
Old 10-09-2014, 07:58   #19
Registered User

Join Date: Dec 2013
Posts: 68
re: Diesel Struggles Under Load

Kenomac, it's a good thought but even just a quick rev before the slack got taken out still showed limited revs .

The prop spun fairly easily by hand after cleaning, unfortunately I don't have anything to baseline it off of

It sounds like I'm going to get into the governor today after work and see what the guts look like


Sent from my iPhone using Cruisers Sailing Forum
__________________
strqaightv8 is offline   Reply With Quote
Old 10-09-2014, 07:58   #20
Moderator
 
HappyMdRSailor's Avatar

Cruisers Forum Supporter

Join Date: May 2008
Location: North Mississippi
Boat: 48 Wauquiez Pilot Saloon-C22 Chrysler Sunpiper- 19 Potter-Preparing to cruise w/my girl
Posts: 5,980
re: Diesel Struggles Under Load

Quote:
Originally Posted by strqaightv8 View Post
I did not run two lines, I just put the suction line in and let the return run to the stock tank, didn't think it would make much difference. I can bypass the first filter but not the second, they have some specialty hoses and fittings from my primary pump all the way through the injector pump.

It's not a terrible job to unbolt the shaft, I've got pretty good access, and it shouldn't be too stuck, I just replaced the coupler about 7 months ago. I like the idea though, I hadn't thought of it. At the very least it would confirm it's nothing to do with prop.

And I bought a 30 year old boat, of course I like fun

Sent from my iPhone using Cruisers Sailing Forum
I'd redo yer bucket with the return plumbed to it... Good news on the coupler... 30 min job instead of a 3 day swearfest... Whew!

Oh man... Ain't they all... Age just increases the fun factor...
__________________
In the harsh marine environment, something is always in need of repair...

Mai Tai's fix everything...
HappyMdRSailor is offline   Reply With Quote
Old 10-09-2014, 08:02   #21
Registered User

Join Date: Dec 2013
Posts: 68
re: Diesel Struggles Under Load

Quote:
Originally Posted by HappyMdRSailor View Post
I'd redo yer bucket with the return plumbed to it... Good news on the coupler... 30 min job instead of a 3 day swearfest... Whew!

Oh man... Ain't they all... Age just increases the fun factor...

I'll give it a shot, just out of curiosity, what's switching the return line over going to do?

3 days my stern, sawzall takes care of that in about 5 minutes, but I'm appreciative of the fact I don't have to buy a new coupler again....

Hey, if we didn't love it, we wouldn't do it


Sent from my iPhone using Cruisers Sailing Forum
__________________
strqaightv8 is offline   Reply With Quote
Old 11-09-2014, 08:27   #22
Moderator
 
HappyMdRSailor's Avatar

Cruisers Forum Supporter

Join Date: May 2008
Location: North Mississippi
Boat: 48 Wauquiez Pilot Saloon-C22 Chrysler Sunpiper- 19 Potter-Preparing to cruise w/my girl
Posts: 5,980
re: Diesel Struggles Under Load

Quote:
Originally Posted by strqaightv8 View Post
I'll give it a shot, just out of curiosity, what's switching the return line over going to do?

3 days my stern, sawzall takes care of that in about 5 minutes, but I'm appreciative of the fact I don't have to buy a new coupler again....

Hey, if we didn't love it, we wouldn't do it


Sent from my iPhone using Cruisers Sailing Forum
Restricted or blocked return raises the pressure inside the IP, changing all of the designed pressure parameters... Can mess with governer output etc...

One thing we haven't touched on is revving up in neutral... What do we get doing that?

Not all couplers are treated alike! Mine has 2 different couplers, BOTH have recessed cap screws.... No sawzallability whatsoever...

We're a tolerant bunch to be sure!
__________________
In the harsh marine environment, something is always in need of repair...

Mai Tai's fix everything...
HappyMdRSailor is offline   Reply With Quote
Old 11-09-2014, 11:54   #23
Moderator
 
sailorchic34's Avatar

Cruisers Forum Supporter

Join Date: Feb 2011
Location: SF Bay Area
Boat: Islander 34
Posts: 4,815
re: Diesel Struggles Under Load

--full range of revs in neutral, around 4k top end, when I put it into gear it bogs down slightly and limits revs to 2-2.5k. It reaches this level where it should, around halfway up my control lever's throw, but the last half of the throw sees no additional increase. And it's not the linkage either here, I've adjusted my screws and worked it manually, no change. I do remember reading about someone with a similar problem and it was the spring that caused it, it's worth looking into, I'll see what I can do with it later today

AH, so we're at either a clogged discharge elbow or injector limiter setscrew or spring. Either of these would cause this condition.

FYI on the Yanmar GM engines if the injector limiter is set wrong, you get the same reaction as above..... Normally set at factory and forgotten about it. Unless some blonde chick, removes it when disassembling her engine, Doh.

But as the engine runs to high rpm without issue in neutral, we can say that the discharge elbow is fine, or fine enough.

BTW Westerbeke calls the injector limiter, High Speed set. located next to the idle speed adjust.

Play with that. if you get smoke at the exhaust, back it out a 1/4 at a time. (only 1/4 turn at a time) otherwise turn it in 1/4 turn at a time till throttle response improves. If it's missing the seal, somebody messed with it. Normally it is never adjusted, factory set.
__________________
sailorchic34 is offline   Reply With Quote
Old 11-09-2014, 13:24   #24
Registered User

Join Date: Dec 2013
Posts: 68
re: Diesel Struggles Under Load

Welp, diagnosis almost complete. Unbolted the transmission coupler and gave her a go, my problem magically disappeared. I'm still cautious to call it finished, the shaft and prop are going to add some kind of resistance which could translate into a struggle earlier down the line somewhere, but it seems pretty definite to me. Time to take another swim.

Anyone have an idea of what might be causing this? I'm going to look for bent blades and the like

As for everything else, didn't test the return line yet, coupler was the first thing I did. I checked the exhaust elbow already and it was clean. Set screws are fine, I fiddled with them first and while it changed my neutral range did nothing for my in gear progress


Sent from my iPhone using Cruisers Sailing Forum
__________________
strqaightv8 is offline   Reply With Quote
Old 11-09-2014, 16:22   #25
Moderator
 
JPA Cate's Avatar

Join Date: Nov 2011
Location: aboard, cruising in Australia
Boat: Sayer 46' Solent rig sloop
Posts: 10,682
re: Diesel Struggles Under Load

strqaightv8,

Sounds like fish line got wrapped around your prop shaft, maybe even sucked up into the cutlass bearing.

Ann
__________________
Ann, with Jim, aboard US s/v Insatiable II, in Oz, very long term cruisers
JPA Cate is offline   Reply With Quote
Old 11-09-2014, 17:51   #26
Registered User

Join Date: Dec 2013
Posts: 68
re: Diesel Struggles Under Load

Quote:
Originally Posted by Ann T. Cate View Post
strqaightv8,

Sounds like fish line got wrapped around your prop shaft, maybe even sucked up into the cutlass bearing.

Ann

That's a good idea, I didn't think about that. I didn't get a chance to dive under today, and won't be back until Monday, but I'll check it then

My thoughts are either something's muffed up in the cutlass bearing or stuffing box, or I ran into something underwater and bent a prop fin or the shaft


Sent from my iPhone using Cruisers Sailing Forum
__________________
strqaightv8 is offline   Reply With Quote
Old 12-09-2014, 05:54   #27
Registered User

Join Date: Nov 2013
Location: Slidell, La.
Boat: Morgan Classic 33
Posts: 1,102
Re: Diesel Struggles Under Load

When you had the transmission uncoupled, how hard was it to turn the prop shaft?
Was there a certain spot that felt like it was binding? The shaft should turn easily all the way around. Do you have a packing-type stuffing box? Is it adjusted correctly?
__________________
jimbunyard is offline   Reply With Quote
Old 12-09-2014, 06:41   #28
Moderator
 
HappyMdRSailor's Avatar

Cruisers Forum Supporter

Join Date: May 2008
Location: North Mississippi
Boat: 48 Wauquiez Pilot Saloon-C22 Chrysler Sunpiper- 19 Potter-Preparing to cruise w/my girl
Posts: 5,980
Re: Diesel Struggles Under Load

Quote:
Originally Posted by sailorchic34 View Post
--
FYI on the Yanmar GM engines if the injector limiter is set wrong, you get the same reaction as above..... Normally set at factory and forgotten about it. Unless some blonde chick, removes it when disassembling her engine, Doh.
You could make a killing sneekin' a "curious looksee" on peoples boats while ya were visitin' for sudowners and the like...

Then ya drive around the marina in a white panel van with the words:

LIMITER SETTING SERVICE


Boldly emblazoned on the side of the van... In the back you keep your custom gold plated, pink handled screwdriver in a velvet box...
__________________
In the harsh marine environment, something is always in need of repair...

Mai Tai's fix everything...
HappyMdRSailor is offline   Reply With Quote
Old 12-09-2014, 06:46   #29
Moderator
 
HappyMdRSailor's Avatar

Cruisers Forum Supporter

Join Date: May 2008
Location: North Mississippi
Boat: 48 Wauquiez Pilot Saloon-C22 Chrysler Sunpiper- 19 Potter-Preparing to cruise w/my girl
Posts: 5,980
Re: Diesel Struggles Under Load

OK man!

Any progress is good progress... Now why did we replace the coupler a few months back??? Did we replace the packing at the same time???

Still not convinced we don't have a load/fuel requirement problem, but again... we have more info... Waiting for your dive info with the rest of us!
__________________
In the harsh marine environment, something is always in need of repair...

Mai Tai's fix everything...
HappyMdRSailor is offline   Reply With Quote
Old 12-09-2014, 11:52   #30
Registered User

Join Date: Dec 2013
Posts: 68
Re: Diesel Struggles Under Load

Quote:
Originally Posted by HappyMdRSailor View Post
OK man!

Any progress is good progress... Now why did we replace the coupler a few months back??? Did we replace the packing at the same time???

Still not convinced we don't have a load/fuel requirement problem, but again... we have more info... Waiting for your dive info with the rest of us!

Did it when I bought the boat in February, my stuffing box hose was shredded, so I replaced that, repacked it at the same time, have it a good cleaning, and changed the cutlass bearing. The old coupler was rusted to **** so I changed that as well


Sent from my iPhone using Cruisers Sailing Forum
__________________

__________________
strqaightv8 is offline   Reply With Quote
Reply

Tags
diesel, loa

Thread Tools
Display Modes Rate This Thread
Rate This Thread:

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


Similar Threads
Thread Thread Starter Forum Replies Last Post
M12 black smoke under load bmiller Engines and Propulsion Systems 27 06-08-2012 16:43
Somaliland Struggles To Fight Piracy sneuman Cruising News & Events 5 15-04-2011 11:00
Formosa 41 Engine Revs Under Load Alan B Monohull Sailboats 3 18-11-2010 01:14
Engine Won't Idle Under Load Tiki 38' Propellers & Drive Systems 37 25-02-2010 01:53



Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 01:40.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.