Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 16-02-2010, 07:27   #16
Registered User

Join Date: Feb 2010
Location: Pompano Beach, FL
Boat: Pearson, P33, 33', Stampede
Posts: 34
Send a message via Skype™ to cfoxcvg
Quote:
Originally Posted by never monday View Post
what's the max RPM in and out of gear?
Out of gear it will easily run up to 3100 RPM but I have not tried to go any higher out of gear.
In gear durring this problem I got it to 3400 RPM and I think it would of gone higher but I was afraid to push her not knowing what was wrong.
Before this problem I have had it up to 3600 RPM during some short test over the last few years. 3400 RPM was no problem in the past and I had to hit this point on occasion to get threw a local bridge with strong currents.
__________________

__________________
cfoxcvg is offline   Reply With Quote
Old 16-02-2010, 07:46   #17
Registered User

Join Date: Jun 2007
Location: SW Florida
Boat: FP Belize, 43' - Dot Dun
Posts: 3,423
Don't be afraid to push the throttle all the way. The governor won't let it over-rev. Operating the throttle is simply asking the governor for a particular RPM, the governor operates the fuel rack on the injection pump. I'm not sure about the 2GMs, but my 3GM30s redline at 3850, one hour rated at 3600, continuous at 3400.
__________________

__________________
DotDun is offline   Reply With Quote
Old 16-02-2010, 08:04   #18
Registered User

Join Date: Jun 2005
Posts: 1,901
please apply full throttle in and out of gear.
Report back RPM and smoke conditions.
__________________
never monday is offline   Reply With Quote
Old 16-02-2010, 08:40   #19
Registered User

Join Date: Mar 2008
Location: Houston TX
Boat: Pacific Seacraft 25 "Turtle"
Posts: 364
Images: 35
On my old boat an even coating of small(pencil erasure size)barnacles on my prop gave me a similar sooty condition if I went over about 2/3 throttle. I found the engine was getting more difficult to start and eventually after checking the compression and finding it very low discovered I had burnt the exhaust valve seat. The engine had been running pretty well up to that point but at 30years old it was nearing time for a rebuild.

After the hurricane put the boat in a swamp I brought her home and while she was in the yard for repair I rebuilt the motor. It now runs like it should, no smoke, no trouble starting, no stalling. Check the compression before going the long way round. My bet is a combination of lower compression and crusties on the prop.........m
__________________
I must go down to the sea again.........
cantxsailor is offline   Reply With Quote
Old 16-02-2010, 09:35   #20
Registered User
 
sigmasailor's Avatar

Join Date: Jan 2010
Location: Netherlands, Holland
Boat: Sold Sigma 33 OOD some time ago, will be chartering in Turkey really soon
Posts: 358
Are you able to get the boat to or over hull speed? If it doesn't maybe you have some internal engine damage or more likely just fouling (because of your previously leaking injector) of the exhaust channels including the mentioned elbow.
The timing issue (if there) seems too small to have any effect.
__________________
sigmasailor is offline   Reply With Quote
Old 24-02-2010, 22:39   #21
Registered User

Join Date: Sep 2006
Posts: 363
Get a compression test before you start throwing money darts at parts.
Forget the guesses....get on with the tests.

Terry
__________________
Tspringer is offline   Reply With Quote
Old 25-02-2010, 06:25   #22
Registered User

Join Date: Feb 2010
Location: Pompano Beach, FL
Boat: Pearson, P33, 33', Stampede
Posts: 34
Send a message via Skype™ to cfoxcvg
Well the problem has been fixed. I changed the shims and that fixed 75% of the issue. The next day I went out and cleaned the bottom. There was a small build up, no more than I have had in the past and there were a few small barnacles on the prop. After cleaning everything we are back in business. Water is crystal clear all the way up to 3400rpm and barley visible smoke is consistent all the way threw the RPM range.

I do think I am slightly over propped, I can only get 3400rpm wide open but I am not concerned being that there are signs that the engine is being over worked and there never has in the past. I am at my haul speed at 2700rpm for a strong cruise.

I can definitely tell the injectors were stuck, I could not here them before but now the sound is distinct and very recognizable, in all the motor is smoother and quieter then ever.

Thank You everyone for your help and input.
__________________
cfoxcvg is offline   Reply With Quote
Old 25-02-2010, 07:34   #23
Registered User

Join Date: Feb 2009
Posts: 1,848
So the issue was injector timing?
__________________
motion30 is offline   Reply With Quote
Old 25-02-2010, 08:05   #24
Registered User

Join Date: Feb 2010
Location: Pompano Beach, FL
Boat: Pearson, P33, 33', Stampede
Posts: 34
Send a message via Skype™ to cfoxcvg
A good part of the issue appears to be injector timing although fowled prop was definitely also a factor. 75% fixed with shims and 25% after cleaning haul.
I would almost never jump to the timing issue except that this was a new problem showing up right after I did the injector pump work and I know I messed the shims up. In the future if there is any question then I will just replace the $24 shim kit. It also opened my eyes first hand as to how close the tolerances are with that pump.
__________________

__________________
cfoxcvg is offline   Reply With Quote
Reply

Tags
2gm, 2gm20, yanmar

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
Yanmar 2GM20f rvennis Engines and Propulsion Systems 5 05-08-2009 06:16
Need Yanmar 2GM20F Basketcase Chief Engineer Classifieds Archive 1 06-04-2009 19:48
Yanmar 2GM20F tach Glenn Whaley Engines and Propulsion Systems 4 12-07-2008 04:47
Yanmar 2GM20F psteele235 Propellers & Drive Systems 4 22-06-2008 06:44
Water Temp Gauge for Yanmar 2GM20F Squeaks Engines and Propulsion Systems 5 12-07-2007 18:34



Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 23:10.


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.