Cruisers Forum

Join CruisersForum Today

Thread Tools Rate Thread Display Modes
Old 21-05-2013, 02:50   #1
Registered User
donegalbreeze's Avatar

Join Date: Apr 2012
Location: Cork Harbour, Ireland
Boat: Spray 33 Bruce Roberts design
Posts: 25
Images: 3
Beta 33hp engine

I have a 33 HP beta marine engine ( marinised Kobots engine) always hard to start from day one...I have had two good diesel mechanics check it out and we have identified that the fuel pump is delivering a small amount of fuel and that the problem is a fuel one.
The plan is to remove the fuel pump and have it set up and bench tested
I have a Kobots series 5 engine manual but it is not great on detail there any other manuals for this engine you know off?? and any comments on the problem

donegalbreeze is offline   Reply With Quote
Old 22-05-2013, 12:10   #2
Marine Service Provider

Join Date: Aug 2008
Location: North Carolina
Posts: 262
Re: Beta 33hp engine

It sounds like you have a fuel supply problem but without some more information, I really cant help.
How far is the fuel tank from the engine?
Is the tank below the engine?
How is the return line run?

NCboatrx is offline   Reply With Quote
Old 22-05-2013, 15:07   #3
Senior Cruiser
roverhi's Avatar

Cruisers Forum Supporter

Join Date: Aug 2005
Location: Kona, Hawaii, Carlsbad, CA
Boat: 1969 Pearson 35 #108 & 1976 Sabre 28
Posts: 6,127
Send a message via Yahoo to roverhi
Re: Beta 33hp engine

Believe it's spelled Kubota, btw. If you have no throttle response and speed increases, it would seem the first two cylinders aren't firing and the 3rd cylinder is sucking lube oil to burn. Not good indications. Pull the injectors and see if you are getting fuel to the cylinders. Do a compression check while the injectors are out. Probably going to mean hauling the engine out and replacing rings in at least one cylinder. other cylinders could be stuck valves which you should be able to determine after pulling the valve cover(s). Good luck.
Peter O.
'Ae'a Pearson 35
roverhi is offline   Reply With Quote
Old 22-05-2013, 15:55   #4
Registered User

Join Date: Jan 2009
Location: Home port is San Diego, California, but we are currently cruising the Caribbean.
Boat: Contest 48
Posts: 698
Images: 1
Re: Beta 33hp engine

I had the exact same problem with my Beta 90. Ultimately, I installed an electric fuel pump and also made certain that the fuel return line had a significant loop that rose above the injection pump. Also, we recently had the manual pump that's fixed to the final fuel filter fail. Right now we're running without the final fuel filter - certainly not recommended but we have a big Racor 2-micron filter just upstream.

Good luck, fair winds and calm seas.
nhschneider is offline   Reply With Quote


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

Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -7. The time now is 20:45.

Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2018, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2018, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.