Return to the home page...

Go Back   Moyer Marine Atomic 4 Community - Home of the Afourians > Discussion Topics > Troubleshooting

Reply
 
Thread Tools Display Modes
  #1   IP: 68.254.109.237
Old 10-05-2021, 09:17 AM
Tripaddle Tripaddle is offline
Senior Member
 
Join Date: Sep 2015
Location: Lancaster, VA
Posts: 10
Thanks: 0
Thanked 0 Times in 0 Posts
Rough running after extended running

Well letís start with I donít have enough time on the boat to properly do all the maintenance. I change the impeller and oil. Also I add a little Marvel Mystery oil to the fuel. We usually run for less than an hour at a time, maybe even less than 30 minutes. It always seems on the way back it runs rough. Lowering the rpm helps at first but this past weekend it ran rough even when I lowered the rpm. We probably never go above 1500 rpm. The temperature never moved while running at the dock for 30 minutes while propeller engaged. The oil pressure began around the 20 psi mark and increased to 40psi as it ran. It is raw water cooled. Iíve often thought I need to do something to get the temperature higher. Iím not sure the complete history of this motor. We bought the boat after it had been on the hard for 7 years. I rebuilt the carb, replaced fuel tank, fuel pump, filter, and all hoses. Iíve never touched the points in the 4 years weíve had it in the water of the Chesapeake Bay. When we bought it other than the fuel pump it cranked and ran. Itís in a 1976 Cal 2-27 and the motor looks fairly clean looking. This past weekend we lost all the wind and motored for over an hour. It never cuts off but does worry me that it might. Iíve ordered the tune up kit, coil, springs, and plug wires. Iím sure the points need replacing and springs oiled and inspected. Iím suspicious of the coil after the motor is warmed up. Iíve pumped gas from the bottom of the tank last year and found no water. Even after sitting for months it will start immediately. Thatís everything I can think to describe the motor. So would you think ignition is a good start? Should I worry about the motor temperature? Next time Iím using my pc instead of typing all this on my phone!
__________________
David
1976 Cal 2-27
Lancaster, VA
Charlotte, NC
Reply With Quote
  #2   IP: 155.186.122.195
Old 10-05-2021, 11:14 AM
Dave Neptune Dave Neptune is offline
Afourian MVP, Professor Emeritus
 
Join Date: Jan 2007
Location: Lake Arrowhead Ca.
Posts: 4,498
Thanks: 553
Thanked 750 Times in 509 Posts
David, sounds as if you are on the right path. Give it a thorough tune-up. Lube the C-advance and replace the points, plugs, condenser, coil and wires.

It is a VERY good idea on these old motors to set the "dwell" with a meter as the cam lobes in the distributor are very worn by now. This wear is bad for the points and makes setting without the meter a guess at best. However with an EI the "dwell" issues are long gone and tuning will be in the past.
A great idea if the budget permits.

Dave Neptune
Reply With Quote
The Following 3 Users Say Thank You to Dave Neptune For This Useful Post:
Sam (10-05-2021), sastanley (10-07-2021), TimBSmith (10-05-2021)
  #3   IP: 69.250.111.245
Old 10-06-2021, 11:05 PM
sastanley's Avatar
sastanley sastanley is offline
Afourian MVP
 
Join Date: Sep 2008
Location: Solomons, MD
Posts: 6,843
Thanks: 869
Thanked 475 Times in 360 Posts
David, How often do you use the boat? In the mid-Chesapeake growth on the prop is a HUGE problem. The boat sitting for extended periods (a few weeks!) can let junk grow on the prop.
I highly recommend you get the prop cleaned and report back. I have resorted to short hauling my boat mid-season in early August a few (several) miles north in Solomons, MD, so I do not get frustrated with the engine running poorly with a fouled prop. I keep my boat in a "clean marina", I don't think I can hire a diver and follow the clean marina guidelines. I have no idea what your situation is where you are, but get I recommend you get the prop cleaned without wasting time on other stuff first and let's go from there.
You have a lot of issues going on..I am just trying to help isolate. All of Dave Neptune's suggestions are good too..just don't blow lots of money until the prop is 100%..
__________________
-Shawn
"Twice Around" - '77 Catalina 30, #511 with original A-4 & MMI manifold.
She is even happier with fresh paint on the topsides!

http://www.moyermarine.com/forums/signaturepics/sigpic3231_6.gif

Last edited by sastanley; 10-06-2021 at 11:19 PM.
Reply With Quote
  #4   IP: 24.61.95.61
Old 10-07-2021, 07:19 AM
ArtJ ArtJ is offline
 
Join Date: Sep 2009
Posts: 2,089
Thanks: 156
Thanked 50 Times in 41 Posts
https://moyermarine.com/product/igni...l-iglm_13_195/



A Ignitor upgrade would be a great improvement easy swapout with points

This is for late model A4 There is also a Early model kit

Best Art
Reply With Quote
Reply

Thread Tools
Display Modes

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

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Running Rough. Misfiring and Running Rich Gabe Troubleshooting 8 08-26-2013 03:07 PM
Rough running Kelly Troubleshooting 27 07-27-2012 05:25 PM
Rough running for the first 30 min. Rick_Powers General Interest 8 02-20-2009 08:40 PM
Running Rough, version 2 - Stuck valve? Blown head gasket? hank Troubleshooting 17 10-27-2008 09:47 PM
Running Rough and no Power Mike Thomas Troubleshooting 5 05-25-2006 06:57 AM


All times are GMT -4. The time now is 06:34 AM.


Powered by vBulletin® Version 3.8.9
Copyright ©2000 - 2021, vBulletin Solutions, Inc.


Universalģ is a registered trademark of Westerbeke Corporation

Copyright © 2004-2021 Moyer Marine Inc.

All Rights Reserved