Cruisers Forum
 


Join CruisersForum Today

Reply
 
Thread Tools Rate Thread Display Modes
Old 14-08-2011, 17:25   #106
Registered User
 
Jesse's Avatar

Join Date: Apr 2008
Location: Oro Bay Puget Sound
Boat: Irwin sloop
Posts: 374
Re: Engine Diagnosis

De-carboning an engine using water spray in the air intake was common practice for flathead engines in the 40s and early 50s. It seemed to work fine on the old low compression engines that actualy needed to have carbon deposits removed to prevent pre-ignition. The deposits aparently acted like glo-plugs and the engines would "ping" like the dickens. Modern engines and diesels operate with higher compression and RPM so carbon is no longer the villian it once was.
__________________

__________________
Jesse is offline   Reply With Quote
Old 15-08-2011, 01:14   #107
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
Re: Engine Diagnosis

Quote:
Originally Posted by Celestialsailor View Post
I almost hate to add this but I was once told and tried it myself to rid carbon build up was to spray from a spray bottle water into the intake about a spray every 30 seconds for about 4-5 times. Under pressure and heat the Oxygen and Hydrogen separate and cause the loosening of the carbon. The few times I did it I got horrendous amounts of black smoke. Having said that, I am not endorsing anyone else try it...
Back in my days as marine engineer this was common practice; daily routine even. The engines (main and auxiliary) had reservoirs (to be filled with water (about one liter for small and op to 10 (per turbo) for the main) just for that purpose. The turbo (air side) pressure was used to spray in the water into the suction side of the turbo's. As I remember it the main purpose was to clean the turbo's. I don't believe the heat would decompose water in O2 en H2; it was the impact of the water spray on the rotating parts that cleaned the turbo's (yep, nice black smoke was the result).

Eric
__________________

__________________
Sailors do it with the wind...
sigmasailor is offline   Reply With Quote
Old 15-08-2011, 11:36   #108
Registered User
 
Jesse's Avatar

Join Date: Apr 2008
Location: Oro Bay Puget Sound
Boat: Irwin sloop
Posts: 374
Re: Engine Diagnosis

Last night the 140 degree clunk wouldn't let me sleep, for carbon deposits to cause that, wouldn't it require the cylinder to be slightly more than half full? Is there a overlength bolt through the flywheel or crankshaft pulley that could contact casting webs or the bottom of the block? Sorry, this thing just wont stop bugging me.
__________________
Jesse is offline   Reply With Quote
Old 15-08-2011, 11:51   #109
Registered User

Join Date: Feb 2011
Posts: 586
Images: 3
Re: Engine Diagnosis

Looking at your picture #4 of 4 (it may be just a distortion caused by camera angle), but the third cylinder from the left looks like it's rotated off center in the bore. This would likely cause a valve to hit the piston. Maybe a bent rod.
__________________
smurphny is offline   Reply With Quote
Old 15-08-2011, 12:10   #110
Registered User

Join Date: Feb 2011
Posts: 586
Images: 3
Re: Engine Diagnosis

Correction to above: PISTON looks rotated.
__________________
smurphny is offline   Reply With Quote
Old 15-08-2011, 13:05   #111
Registered User
 
Celestialsailor's Avatar

Join Date: Nov 2006
Location: In Mexico, working on the boat
Boat: Hallberg Rassy 35. and 14ft.Whitehall pulling skiff.
Posts: 8,013
Images: 5
Re: Engine Diagnosis

Quote:
Originally Posted by Jesse View Post
Last night the 140 degree clunk wouldn't let me sleep, for carbon deposits to cause that, wouldn't it require the cylinder to be slightly more than half full? Is there a overlength bolt through the flywheel or crankshaft pulley that could contact casting webs or the bottom of the block? Sorry, this thing just wont stop bugging me.
See post #102. Remember it is 180 degrees for between the 2 sets of pistons to go to TDC. Therefore 180-145=35degrees difference divided by 2= 17 degrees per each side of TDC. 17 degrees at the top of the crank would only be 1/16" where as if the crank moved 17 degrees when it was at 90 degrees, the movement would be closer to 1/4". I hope I have explained it ok.
__________________
"Life is not a journey to the grave with the intention of arriving safely in a pretty and well-preserved body, but rather to skid in broadside, thoroughly used up, totally worn out, and loudly proclaiming: Wow - what a ride!"

http://wwwjolielle.blogspot.com/
Celestialsailor is offline   Reply With Quote
Old 15-08-2011, 13:08   #112
Registered User
 
Celestialsailor's Avatar

Join Date: Nov 2006
Location: In Mexico, working on the boat
Boat: Hallberg Rassy 35. and 14ft.Whitehall pulling skiff.
Posts: 8,013
Images: 5
Re: Engine Diagnosis

Quote:
Originally Posted by smurphny View Post
Correction to above: PISTON looks rotated.

Optical delusion
__________________
"Life is not a journey to the grave with the intention of arriving safely in a pretty and well-preserved body, but rather to skid in broadside, thoroughly used up, totally worn out, and loudly proclaiming: Wow - what a ride!"

http://wwwjolielle.blogspot.com/
Celestialsailor is offline   Reply With Quote
Old 15-08-2011, 15:51   #113
Registered User

Join Date: Feb 2011
Posts: 586
Images: 3
Re: Engine Diagnosis

Have you dropped the pan to look? That piston sure looks like it's rotated quite a few degrees from the others whose piston top valve space line is 90 degrees to the CL of the engine. Did you have the rods detached from the crank already when you took the picture?
__________________
smurphny is offline   Reply With Quote
Old 15-08-2011, 15:58   #114
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
Re: Engine Diagnosis

Just read from the start; the first to come of was the pan; the head was second.
__________________
Sailors do it with the wind...
sigmasailor is offline   Reply With Quote
Old 15-08-2011, 16:06   #115
Registered User

Join Date: Feb 2011
Posts: 586
Images: 3
Re: Engine Diagnosis

Been following this thread from the start and did not remember reading that. Guess the rods were unbolted already although the others seem to be still in line.
__________________
smurphny is offline   Reply With Quote
Old 15-08-2011, 16:12   #116
Registered User
 
Celestialsailor's Avatar

Join Date: Nov 2006
Location: In Mexico, working on the boat
Boat: Hallberg Rassy 35. and 14ft.Whitehall pulling skiff.
Posts: 8,013
Images: 5
Re: Engine Diagnosis

Quote:
Originally Posted by smurphny View Post
Been following this thread from the start and did not remember reading that. Guess the rods were unbolted already although the others seem to be still in line.
No...Bottom end still intact. I cleaned the top of the pistolas and will upload a picture to show you.
__________________
"Life is not a journey to the grave with the intention of arriving safely in a pretty and well-preserved body, but rather to skid in broadside, thoroughly used up, totally worn out, and loudly proclaiming: Wow - what a ride!"

http://wwwjolielle.blogspot.com/
Celestialsailor is offline   Reply With Quote
Old 15-08-2011, 16:25   #117
Registered User

Join Date: Feb 2011
Posts: 586
Images: 3
Re: Engine Diagnosis

That's great! Only reason I thought that might be it was that I once had a Grey Marine 4 banger gas motor that had a twisted rod causing the motor to bind. With the low hours on yours, you may be able to simply give it a good honing. If you can't see/feel any ridge, you might be able to live with a couple of minor score lines. I just honed my Yanmar with a 3 stone hone.
__________________
smurphny is offline   Reply With Quote
Old 15-08-2011, 18:27   #118
Senior Cruiser
 
Cheechako's Avatar

Cruisers Forum Supporter

Join Date: Aug 2006
Location: Skagit City, WA
Posts: 19,363
Re: Engine Diagnosis

Quote:
Originally Posted by Celestialsailor View Post
No...Bottom end still intact. I cleaned the top of the pistolas and will upload a picture to show you.
You are going to want to buy the piston set (which comes with the rods etc I think) for your 3gm30. Pistons are the weak point in that engine. The land between the lowest and next ring tends to break loose. That may be why you have scoring in the one cylinder.... Maybe they offer a complete sleeve, piston rod set?
__________________
"I spent most of my money on Booze, Broads and Boats. The rest I wasted" - Elmore Leonard











Cheechako is offline   Reply With Quote
Old 15-08-2011, 23:26   #119
Registered User
 
sww914's Avatar

Join Date: May 2009
Location: Punta De Mita
Boat: Vagabond 39 Hull # 1
Posts: 1,842
Re: Engine Diagnosis

Umm, it's a 4 cylinder Mitsubishi not a 3 cylinder Yanmar.
__________________
Steve
http://www.landfallvoyages.com
sww914 is offline   Reply With Quote
Old 16-08-2011, 12:42   #120
Senior Cruiser
 
SkiprJohn's Avatar

Cruisers Forum Supporter

Join Date: May 2006
Location: Kea'au, Big Island, Hawaii
Boat: Cascade, Sloop, 42 - "Casual"
Posts: 14,192
Re: Engine Diagnosis

Just a comment. I don't think the Westerbeke 4-108 has sleeved cylinders. Am I wrong here?
__________________

__________________
John
SkiprJohn is offline   Reply With Quote
Reply

Tags
engine

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
Challenge: Bringing a Larger Boat Into a Slip Without An Engine Ben M-P Challenges 88 29-09-2017 17:11
Cruisers Stranded - in Need of Advice Bright Eyes Engines and Propulsion Systems 61 02-08-2011 11:47
Stalling Universal 5424 Engine ryderstk Engines and Propulsion Systems 13 27-07-2011 10:20
Challenge: Depth Sounder Fails, but Only when Engine Is Running Cat-a-tonic Challenges 8 25-07-2011 12:32
Engine Vibrating Violently when Shifting to Neutral Heikki Engines and Propulsion Systems 24 13-07-2011 08:07



Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 06:10.


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.