2gm20F Fan Belts - 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.


Reply
 
LinkBack Thread Tools
  #1  
Old 10-02-2009
Junior Member
 
Join Date: Oct 2009
Posts: 2
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
rjc9136quinn is on a distinguished road
2gm20F Fan Belts

Good morning,
I have a Yanmar 2gm20 F with just under 300 hours. My fan belt is fraying into a fine ,fluffy powder. I lost a belt in Vineyard Sound in August and the replacement is fraying in the same manner. I have tried tightening and loosening, both to no avail. Pulleys appear to be in line and no play in the sheaves.
I'm running out of ideas to try for what seems to be a rather simple problem.
If anyone else has had a similar problem and solved it I would love to read the solution.
Thanks.

rjc9136quinn
Reply With Quote Share with Facebook
  #2  
Old 10-02-2009
Vasco's Avatar
Warm Weather Sailor
 
Join Date: Sep 2006
Location: Toronto
Posts: 959
Thanks: 0
Thanked 5 Times in 5 Posts
Rep Power: 8
Vasco is on a distinguished road
Usually it's an alignment problem but if that's ok I'd switch to a better grade belt. I use Dayco Top cogs.
__________________
Rick I
Toronto in summer, Bahamas in winter.

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
  #3  
Old 10-02-2009
Senior Member
 
Join Date: Oct 2006
Location: Virginia
Posts: 722
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 8
badsanta is on a distinguished road
I had a yanmar 3gm30 and found my alternator was not aligned right. I had a machine shop re drill a hole ($10) and put in a larger bolt. It used to twist as you tightened it down, now rock solid.
__________________
That derelict boat was another dream for somebody else, don't let it be your nightmare and a waste of your life.
Reply With Quote Share with Facebook
  #4  
Old 10-02-2009
timebandit's Avatar
Senior Member
 
Join Date: Sep 2002
Posts: 928
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 12
timebandit is on a distinguished road
So--What are you driving with that belt?
__________________
Rick
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

Mac 25
Copernicus
Southern California
I am not a prejudice racist sexist bigot. I just hate stupid people.
Reply With Quote Share with Facebook
  #5  
Old 10-03-2009
timebandit's Avatar
Senior Member
 
Join Date: Sep 2002
Posts: 928
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 12
timebandit is on a distinguished road
A little something worth reading--

Notes on Pulleys and Belts
__________________
Rick
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

Mac 25
Copernicus
Southern California
I am not a prejudice racist sexist bigot. I just hate stupid people.
Reply With Quote Share with Facebook
  #6  
Old 10-03-2009
JohnRPollard's Avatar
Moderator
 
Join Date: Mar 2007
Location: Chesapeake
Posts: 5,680
Thanks: 0
Thanked 2 Times in 2 Posts
Rep Power: 10
JohnRPollard is a jewel in the rough JohnRPollard is a jewel in the rough JohnRPollard is a jewel in the rough
Quote:
Originally Posted by rjc9136quinn View Post
Good morning,
I have a Yanmar 2gm20 F with just under 300 hours. My fan belt is fraying into a fine ,fluffy powder. I lost a belt in Vineyard Sound in August and the replacement is fraying in the same manner. I have tried tightening and loosening, both to no avail. Pulleys appear to be in line and no play in the sheaves.
I'm running out of ideas to try for what seems to be a rather simple problem.
If anyone else has had a similar problem and solved it I would love to read the solution.
Thanks.

rjc9136quinn
Fan belt?

I assume you mean the alternator belt?

Are you running a stock Hitachi alternator, or have you upgraded to a high-output alternator?

If you're running a high-output alternator, the stock belts just aren't up to the loads and tend to wear quickly. You normally need to use a special heavy duty belt like a Gates Green Stripe.

If it's just the stock alternator, have you had any indication that the bearings in the alternator are binding up? Noise, resistance, lower output, etc?
__________________

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

Pacific Seacraft Crealock 31 #62

NEVER CALLS CRUISINGDAD BACK....CAN"T TAKE THE ACCENT
Reply With Quote Share with Facebook
  #7  
Old 10-03-2009
roline's Avatar
Cal 9.2 SilverSwan
 
Join Date: Jul 2000
Location: East Tennessee
Posts: 272
Thanks: 0
Thanked 1 Time in 1 Post
Rep Power: 15
roline is on a distinguished road
The 9.2 Cal that I bought with a 2GM20 had black dust all over the front of the engine. I spent a couple hrs cleaning the engine and compartment and then replaced the alternator belt with a top cog belt from the local car parts store. 55 amp alt...It has worked well, no new black dust, for over 5yrs. The old belt had worn thin and was slipping in the pullies. The small raw water pump belt did not have an equivilent, so I had to order a Yanmar belt.
__________________
Cal 9.2 #19 SilverSwan
Reply With Quote Share with Facebook
  #8  
Old 10-03-2009
Stillraining's Avatar
Handsome devil
 
Join Date: Jan 2008
Location: LaConner,Washington
Posts: 3,477
Thanks: 0
Thanked 1 Time in 1 Post
Rep Power: 9
Stillraining is a jewel in the rough Stillraining is a jewel in the rough Stillraining is a jewel in the rough
I second the Gates Green strips..I once had one flip over backwards due to misaligned pulleys and run that way for a while..It was badly deformed when i caught it and took it off..I could barley twist it straight with my hands but it would not keep its shape...just for grins I put it back on and within a couple hours it was running true and straight..Tough Belts indeed...I took it off and kept it as a spare. ..Also check your pulleys for bad rust in the groove.
__________________
"Go Simple...Go Large"

Relationships are everything to me..everything else in life are just tools to enhance them.


The purchase price of a boat is just the admittance fee to the dance...you still have to spend money on the girl...so court one with something going for her with pleasing and desirable character traits others desire as well... or you could find yourself in a disillusioned relationship contemplating an expensive divorce.
Reply With Quote Share with Facebook
  #9  
Old 10-03-2009
RichH's Avatar
Senior Member
 
Join Date: Jul 2000
Location: Pennsylvania
Posts: 2,698
Thanks: 9
Thanked 57 Times in 51 Posts
Rep Power: 15
RichH will become famous soon enough
Yanmar sheeves are prone to rust !!!!!!! Check the pulley on the engine fresh water pump - notorious for rusting and leaving a roughened surface where the belt contacts the sheeve. Very common problem on QM and GM Yanmars. Also check the surface condition of the alternator sheeve belt. You can remove these and 'dress' them back to smooth if you have a lathe, etc.; but, its usually cheaper just to replace them.

A good idea when storing the boat long term is to spray on 'Boeshield' on the shiney surfaces of the sheeves ... to prevent rust and pitting.


The second problem may be your alternator (load). If the alternator is working against a FULL load you may be exceeding the belts ability to transfer torque to the sheeves. If the the sheeves are smooth and aligned and you are getting 'dusting' than its time to consider to 'derate'/decrease the alternator output - easy to do with an external 'smart' regulator. An external 'smart' regulator will bring the alternator slowly on line (prevent excessive belt 'dusting', instead of 'hitting it' with a full load from the start.

First off - look at the condition of the wear faces on your sheeves; especially the steel sheeve/pulley thats on the FRESH water pump.
Reply With Quote Share with Facebook
  #10  
Old 10-08-2009
Junior Member
 
Join Date: Oct 2009
Posts: 2
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
rjc9136quinn is on a distinguished road
Yanmar alternator belts

Quote:
Originally Posted by rjc9136quinn View Post
Good morning,
I have a Yanmar 2gm20 F with just under 300 hours. My fan belt is fraying into a fine ,fluffy powder. I lost a belt in Vineyard Sound in August and the replacement is fraying in the same manner. I have tried tightening and loosening, both to no avail. Pulleys appear to be in line and no play in the sheaves.
I'm running out of ideas to try for what seems to be a rather simple problem.
If anyone else has had a similar problem and solved it I would love to read the solution.
Thanks.

rjc9136quinn
Thanks to all who responded to this inquiry. I am going to be trying several of the suggestions and will post my results when I have them.
rjc
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
Balmar Alternator Eating Belts sjacovino Diesel 18 12-09-2013 08:26 AM
Could a fan in front of a sailboat improve sailing? RGClark General Discussion (sailing related) 181 12-22-2010 05:01 PM
Yanmar 2GM20F Petar Gear & Maintenance 13 10-02-2009 06:49 PM
2GM20F - Fresh Water Circulating pump Bill R Island Packet 5 09-17-2007 12:53 PM


All times are GMT -4. The time now is 07:19 AM.

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