SailNet Community - Reply to Topic

   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 > Kubota rattle
 Not a Member? 


Thread: Kubota rattle Reply to Thread
Title:
  

By choosing to post the reply below you agree to the rules you agreed to when joining Sailnet.
Click Here to view those rules.

Message:
Trackback:
Send Trackbacks to (Separate multiple URLs with spaces) :
Post Icons
You may choose an icon for your message from the following list:
 

Register Now

In order to be able to post messages on the SailNet Community forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
Please note: After entering 3 characters a list of Usernames already in use will appear and the list will disappear once a valid Username is entered.
User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.



Click here to view the posting rules you are bound to when clicking the
'Submit Reply' button below


Additional Options
Miscellaneous Options

Click here to view the posting rules you are bound to when clicking the
'Submit Reply' button below


Topic Review (Newest First)
11-14-2012 02:20 AM
jcullain
Re: Kubota rattle

Thanks for the advise!

As klem suggested, I probed around with a screwdriver to pinpoint the noise. It seems most load in the upper cylinder area.

I now believe the rattle is actually DIESEL KNOCK. Maybe caused by a faulty or out of adjustment injector.

Also done:
* Checked fuel pressure at the inlet to the injector pump 7 psi constant
* Cleaned the fuel delivery valve at the injection pump
* checked all belts for binding or slap
* removed air filter- same result
* tested the fuel spray pattern- looks very good

Now it just seems we have to wait for a new injector or a place that can rebuild the old one. Nobody can test it locally.

Jerry
11-13-2012 06:21 PM
klem
Re: Kubota rattle

In addition to the above suggestions, here are 2 more. Try to pinpoint where on the engine the rattle is. If you have a stethoscope, this will work well, if not, hold a screwdriver with one end touching a part of the engine and the other your ear.

Also, if you can get a fuel pressure reading at the injection pump, that would help a lot.
11-13-2012 12:41 PM
NCboatrx
Re: Kubota rattle

This could be caused by the injector. I suggest that you have it checked.
11-13-2012 11:34 AM
chucklesR
Re: Kubota rattle

OP says filter was / is clean; I'd look at the pump, and check the air filter and supply.

Depends on what is making the rattle, I doubt it's valves. Could be related to the 'starve' i.e., mounts, gen head, belts binding and or slapping.

Jerry, you've got to stick your head in there and really eyeball the whole thing and see if anything is moving that shouldn't, or shouldn't and is.
Is the rattle in sync with the rpm?
11-13-2012 11:20 AM
mm2187
Re: Kubota rattle

When is the last time you changed fuel filters? Does it sound like your engine is fuel istarved.
11-13-2012 09:29 AM
jcullain
Kubota rattle

Hello Forum! Our first post here, and it is a tough problem!

We recently purchased a "rebuilt" Kubota EB300 diesel generator. It ran great for a while, but has been developing a "rattle".

When it happens, it quickly looses power, and rpm drops right down. It has been happening much more often lately. The noise sounds a lot like a hydraulic lifter rattle on a car, but of course this engine does not have those!

The boat is in Thailand, and the seller is in Australia ignoring my emails

Some things we checked:
Oil pressure great
Coolant temp normal
Load is within normal range
Very little or no smoke
Injector cleaned and reinstalled
fuel filter clean
The oil looked ok when changed, no metal particles

Any possible cause? We dread it may be something internal about to really go bad!

Thanks
Jerry

 
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


All times are GMT -4. The time now is 02:38 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

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.