Engine woes...please help! - SailNet Community
LinkBack Thread Tools
post #1 of 2 Old 06-24-2007 Thread Starter
Junior Member
mikeg1's Avatar
Join Date: Jul 2005
Posts: 1
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
Engine woes...please help!

I have an A-4 and have had recurring problems with the engine from the start. I lost it going from King Harbor to Del Ray two years ago. That was a bad head gasket. Symptoms were: loss of power, then dead. Re-start, loss of power and dead...finally, no re-start.

Shipped the boat to Portland, and did the following: Re-built carb, new head gasket, new plugs, points and condenser, cap and rotor, new coil and distributor, new fuel lines and filter. Ran ok, but not great, so new carb, new fuel pump, new fuel/water separating filter, new plugs. Ran pretty good.

Then, took the boat to Astoria and lost the engine on the trip down the Columbia. Symptoms were loss of RPM, dead. Restart, loss of RPM and dead...finally dead.

Then, took the head off, machined it, new gaskets again, changed thermostat and housing, as the old one was stuck open. New RACOR fuel/water separating filter, New plugs again, and new plug wires, as No. 1 wire broke at the bend at the plug. Ran great, so sea trialed for two hours and thought we finally got it fixed.

Saturday, set out for trip to Seattle, and the same sypmtoms occurred again after only 1/2 hour on the water. Aborted and limped back to the berth. In trouble shooting since then, have loosened the packing nut so it drips fairly freely as it was a little too tight. New fuel pick up tube and fittings. New line from the tank to the filter...it was the only one I hadn't changed previously. Checked points gap and found it too tight, so loosened up to the .020 spec. Found that the condenser wire had been abraded by the rotor, so fixed that with RTV silicone and pushed the wire out of harms way. Tightened all the fuel line fittings and checked the internal fuel pump filter just to make sure no pinhole or gaps for air to enter.

The symptoms are that it runs great with no load. I can get all the RPM I want up to 4500...as far as I wanted to take it. I then put it under load, forward OR reverse and can only get 1200 to 1500. It ran at 2,000 to 2,500 just fine last week before I did the other stuff yesterday in troubleshooting and repairs. Then, took the carb out last night to check for anything that might be in the carb and it was OK...

After serious consideration and several hours of troubleshooting, it appears there may be a constriction of the prop shaft, as in a bearing that is siezing maybe? Anyway, it is a thought. If anyone has an idea of how this goes together, whether there is a bearing or a bushing and if it can be taken apart without hauling the hull, I would appreciate the knowledgebase....thanks again for anyone's help

Thinking my next step is exorcism...any ideas, no matter how silly sounding, will be gratefully accepted.

C-30 TRBS #1269
SV Solus Deus


"Every time I go sailing I learn something new or I remember something I forgot" Usually with the highest order of embarrassment.
mikeg1 is offline  
Quote Quick Reply Share with Facebook
Sponsored Links
post #2 of 2 Old 06-24-2007
USCGRET1990's Avatar
Join Date: May 2007
Location: YORKTOWN, VA
Posts: 1,380
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 11
Disconnect the shaft from the trans. You should be able to turn the prop shaft by hand. If it requires a pipe wrench to move with much force, then you have a shaft problem. If it turns freely by hand, then it's an engine problem. Lack of power under load is usually a fuel problem. These guys work with nothing but A-4's, maybe they can help also. Google-ing Atomic Four Marine Engines, brings up a wealth of info as well.
Moyer Marine Atomic 4 Engine Rebuilding and Parts
USCGRET1990 is offline  
Quote Quick Reply Share with Facebook

Quick Reply

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

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:
Please enter a password for your user account. Note that passwords are case-sensitive.


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:


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.

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page

Similar Threads
Thread Thread Starter Forum Replies Last Post
Runaway Diesel Engine Ben Hilke Gear and Maintenance Articles 0 07-19-2004 08:00 PM
Caring for the Cruising Outboard Doreen Gounard Gear and Maintenance Articles 0 04-22-2003 08:00 PM
Surveying a Diesel Engine Tom Wood Buying a Boat Articles 0 01-26-2003 07:00 PM
Surveying a Diesel Engine Tom Wood Gear and Maintenance Articles 0 01-26-2003 07:00 PM
Replacing the Diesel Engine Sue & Larry Gear and Maintenance Articles 0 06-12-2000 08:00 PM

Posting Rules  
You may post new threads
You may 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 On
Trackbacks are On
Pingbacks are On
Refbacks are On

For the best viewing experience please update your browser to Google Chrome