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: 152.163.100.136
Old 08-15-2005, 05:45 PM
Sailwood Sailwood is offline
Senior Member
 
Join Date: Dec 2004
Location: Southern NJ
Posts: 25
Thanks: 0
Thanked 0 Times in 0 Posts
rpm increase and decrease w/o adjusting throttle

Yesterday I noticed the engine rpm increase for several seconds, then return to its previous rpm without touching the throttle. It seemed to irregularly cycle. We're talking several seconds, then normal, then several seconds. There is no discernable change in hull speed when it revs higher (perhaps 200-300 rpm). Clutch/reversing gear problem? This occured on the way back in after a 3 hour sail. No similar problem previously. Engine otherwise is running well at present.

Doug Soden
ASPEN Columbia 29 #131
Reply With Quote
  #2   IP: 74.65.190.80
Old 09-01-2018, 11:25 AM
zanchi zanchi is offline
Member
 
Join Date: May 2016
Posts: 3
Thanks: 1
Thanked 0 Times in 0 Posts
I have the same issue!
Reply With Quote
  #3   IP: 172.95.97.58
Old 09-04-2018, 05:25 PM
Dave Neptune Dave Neptune is online now
Afourian MVP
 
Join Date: Jan 2007
Location: Lake Arrowhead Ca.
Posts: 3,850
Thanks: 359
Thanked 289 Times in 208 Posts
S & z, it could easily be the alternator kicking in and out. Check the charging levels during the next episode. You can also disable the alt via the belt or unplugging the "exciting" wire to see if the surging goes away. The engine will run a long time on the battery alone.

Dave Neptune
Reply With Quote
The Following User Says Thank You to Dave Neptune For This Useful Post:
ndutton (09-04-2018)
  #4   IP: 24.152.132.140
Old 09-04-2018, 06:44 PM
ndutton's Avatar
ndutton ndutton is online now
Afourian MVP
 
Join Date: May 2009
Location: Torrance, CA
Posts: 8,171
Thanks: 125
Thanked 1,041 Times in 701 Posts
Concur, intermittent alternator load.
__________________
Neil
1977 Catalina 30
San Pedro, California
prior boats 1987 Westsail 32, 1970 Catalina 22
Had my hands in a few others
Reply With Quote
  #5   IP: 72.69.36.126
Old 09-04-2018, 11:26 PM
tenders tenders is offline
Afourian MVP
 
Join Date: May 2007
Location: Harlem YC, City Island, NY
Posts: 1,276
Thanks: 24
Thanked 147 Times in 101 Posts
I vote for intermittent valve sticking. Add an ounce of Marvel Mystery Oil for every five gallons of gas in the fuel tank, more or less, and see what happens after an hour's running.

(Note, original post is from 13 years ago.)
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


All times are GMT -4. The time now is 02:32 PM.


Powered by vBulletin® Version 3.8.9
Copyright ©2000 - 2018, vBulletin Solutions, Inc.


Universal® is a registered trademark of Westerbeke Corporation

Copyright © 2004-2018 Moyer Marine Inc.

All Rights Reserved