Overheating M35-B - SailNet Community

   Search Sailnet:

 forums  store  


Quick Menu
Forums           
Articles          
Galleries        
Boat Reviews  
Classifieds     
Search SailNet 
Boat Search (new)

Shop the
SailNet Store
Anchor Locker
Boatbuilding & Repair
Charts
Clothing
Electrical
Electronics
Engine
Hatches and Portlights
Interior And Galley
Maintenance
Marine Electronics
Navigation
Other Items
Plumbing and Pumps
Rigging
Safety
Sailing Hardware
Trailer & Watersports
Clearance Items

Advertise Here






Go Back   SailNet Community > On Board > Gear & Maintenance > Engines > Diesel
 Not a Member? 

Diesel This is a new forum dedicated to diesel engines and their applicable accessories.


Like Tree4Likes
Reply
 
LinkBack Thread Tools
  #1  
Old 08-16-2011
epaolino's Avatar
Rapscallion
 
Join Date: Jun 2004
Posts: 29
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
epaolino is on a distinguished road
Overheating M35-B

I was wondering could a fouled prop cause overheating?

Took the boat out after an extended period at the dock to have a riser pipe installed. I felt the prop was fouled as we moved forward ( seemed sluggish ). Worked ok in low rpms. Plenty of water coming out of exhaust. warmed up and pushed past the no wake zone... in about a mile...over heating, blaksmoke and steam. I shut it down, check the antifreeze, ok checked oil, ok. let the engine cool a little, restarted water coming out exhaust, cooled down to normal. Kept it below 1500 limped back to the slip. Checked the raw water stariner, clear Ok, Checked Impeller, Ok no broken vanes.

Could it really be just a badly fouled prop?
Reply With Quote Share with Facebook
  #2  
Old 08-16-2011
Senior Member
 
Join Date: Feb 2011
Location: San Francisco Bay area
Posts: 2,169
Thanks: 1
Thanked 33 Times in 33 Posts
Rep Power: 4
MarkSF is on a distinguished road
Interesting, as mine behaved exactly the same yesterday. It was fine heading out at 2K rpm, but on the way back the temp started to rise until it hit 190. At that point I throttle back to 1400rpm and the temp dropped right down.

Haven't checked the strainer yet though.

But in answer to your question, I think it could cause overheating yes.
epaolino likes this.
__________________
1984 Bristol 31.1
Alameda, California, USA
Reply With Quote Share with Facebook
  #3  
Old 08-16-2011
epaolino's Avatar
Rapscallion
 
Join Date: Jun 2004
Posts: 29
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
epaolino is on a distinguished road
Thanks for the reply mark....

I thought that a fouled prop would act like a "freewheeling" prop with no bite and would do no work.
Reply With Quote Share with Facebook
  #4  
Old 08-16-2011
emoney's Avatar
Senior Member
 
Join Date: Jun 2010
Posts: 545
Thanks: 0
Thanked 1 Time in 1 Post
Rep Power: 5
emoney is on a distinguished road
I'm no expert, but I'd think a fouled prop might show other signs/symptoms as well??
What about the "cooling pump" (I may be misnaming this part) that's belt driven on the top-front of the engine? Is your drive belt tight enough? Just throwing out suggestions.
epaolino likes this.
Reply With Quote Share with Facebook
  #5  
Old 08-16-2011
epaolino's Avatar
Rapscallion
 
Join Date: Jun 2004
Posts: 29
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
epaolino is on a distinguished road
The belt driven engine water ( antifreeze ) pump, checked belt tension and is not leaking. Raw water pump impeller is intact and ok.
Reply With Quote Share with Facebook
  #6  
Old 08-17-2011
MacGyverRI's Avatar
Senior Member
 
Join Date: Nov 2007
Location: East Providence, R.I.
Posts: 360
Thanks: 0
Thanked 1 Time in 1 Post
Rep Power: 7
MacGyverRI is on a distinguished road
It could have algae or barnacles on the through hull (usually a slotted intake) restricting the flow.
epaolino likes this.
__________________
Ken, East Prov., R.I. Bootlegger, PY26 Paceship

If you like my posts, or they were helpful, please click the "scales" icon on top right to add Rep points.
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Reply With Quote Share with Facebook
  #7  
Old 08-17-2011
eherlihy's Avatar
Learning the HARD way...
 
Join Date: Jan 2007
Location: Boston Area
Posts: 3,438
Thanks: 105
Thanked 54 Times in 53 Posts
Rep Power: 8
eherlihy will become famous soon enough
The answer to your question;
Quote:
could a fouled prop cause overheating?
is YES.

Growth on the prop adds to the drag. Depending on how much growth, it could require SUBSTANTIALLY more torque to spin the prop at a given RPM. The prop could even be restricted by growth.

Think of it as if you were towing a heavy load with your car. The engine has to work much harder to accomplish the same amount of work.
epaolino likes this.
__________________

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

USCG Licensed OUPV Captain, ASA 101/103/104/105 Certified Instructor - Also certified in Recreational Marine Electrical Systems


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Getting back onto the water after undergoing knee surgery.
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Reply With Quote Share with Facebook
  #8  
Old 08-17-2011
emoney's Avatar
Senior Member
 
Join Date: Jun 2010
Posts: 545
Thanks: 0
Thanked 1 Time in 1 Post
Rep Power: 5
emoney is on a distinguished road
Quote:
Originally Posted by MacGyverRI View Post
It could have algae or barnacles on the through hull (usually a slotted intake) restricting the flow.
^this, is a great thought. Very easy to check; grab a snorkel mask and jump in. Also, simple to solve too. Hopefully this is the case. I would suggest, however, that in the future you think about installing a temp gauge. By the time the "smoke billows", it can be way too late. Just a though. Good luck.
Reply With Quote Share with Facebook
  #9  
Old 08-17-2011
epaolino's Avatar
Rapscallion
 
Join Date: Jun 2004
Posts: 29
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
epaolino is on a distinguished road
Bottom kind of clean.... Prop loaded!

Reply With Quote Share with Facebook
  #10  
Old 08-17-2011
epaolino's Avatar
Rapscallion
 
Join Date: Jun 2004
Posts: 29
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
epaolino is on a distinguished road
Quote:
I would suggest, however, that in the future you think about installing a temp gauge. By the time the "smoke billows", it can be way too late
Good Point.

Temp gauge is at ankle level....was hot enough to wiff some steam not hot enough to trigger hi temp alarm... I need to double check the alarm...
Reply With Quote Share with Facebook
Reply


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

 
Posting Rules
You may post new threads
You may post replies
You may post attachments
You may edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On


Similar Threads
Thread Thread Starter Forum Replies Last Post
overheating M25 BarryL Diesel 5 06-12-2010 08:28 PM
overheating ??? DennisKrotzer Islander 2 07-26-2009 10:09 PM
Overheating HELP !!! Culinary411 Gear & Maintenance 19 08-07-2007 05:33 PM
Yanmar 2GM overheating Northeaster Gear & Maintenance 11 07-18-2007 03:07 PM
perkins 4-108 overheating lisevp Gear & Maintenance 1 01-29-2003 01:38 AM


All times are GMT -4. The time now is 10:32 PM.

Add to My Yahoo!         
Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
SEO by vBSEO 3.6.1
(c) Marine.com LLC 2000-2012

The SailNet.com store is owned and operated by a company independent of the SailNet.com forum. You are now leaving the SailNet forum. Click OK to continue or Cancel to return to the SailNet forum.