Return to the home page...

Go Back   Moyer Marine Atomic 4 Community - Home of the Afourians > Owner Discussion Groups > Discussion Groups > Bristol

Thread Tools Display Modes
  #1   IP:
Old 11-19-2006, 07:58 AM
dinkum1 dinkum1 is offline
Frequent Contributor
Join Date: Nov 2006
Posts: 8
Thanks: 0
Thanked 0 Times in 0 Posts
Engine/Drive Train Noise

We recently purchased a 1975 Bristol 27' with an Atomic Four. During
our initial cruise we noticed that at RPMs above 600 there was a
knocking sound. This sound is not heard with the engine running in
neutral or increasing the RPMs while in neutral. With the engine in
forward gear and upon acceleration (more than 600rpms) the knocking
sound becomes apparent and increases as the rpms are increased.

Question: Does anyone know if this is normal for the Atomic Four or
Bristol 27 or if there might be a particular problem that needs to be
addressed? Any input or help would be appreciated. Thanks.

Michelle and Harley
Reply With Quote
  #2   IP:
Old 11-20-2006, 06:14 AM
jhwelch's Avatar
jhwelch jhwelch is offline
Senior Member
Join Date: Dec 2005
Posts: 478
Thanks: 0
Thanked 1 Time in 1 Post
Ginen the fact that the noise only happens when the shaft is turning
I'd suspect an issue with the propeller or shaft. Did you see the
boat out of the water before you bought it and did you grab the
propeller and try to move it around to see if the cutlass bearing
was worn? The shaft could be a bit out of true. Does the same
kind of noise happen in reverse?

I own a Bristol 29.

Reply With Quote

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
Engine/Drive Train Noise dinkum1 Troubleshooting 17 08-19-2008 02:18 PM
reversing gear noise? Capt.Terry Reversing Gear 1 11-03-2006 11:56 AM
New noise? JimG Troubleshooting 8 12-31-2005 10:36 AM
Rattling noise after rebuild lhbradley General Maintenance 2 07-21-2005 02:03 PM
Noise coming from the transmission Unregistered Reversing Gear 1 03-28-2005 08:57 AM

All times are GMT -4. The time now is 01:13 AM.

Powered by vBulletin® Version 3.8.9
Copyright ©2000 - 2019, vBulletin Solutions, Inc.

Universalģ is a registered trademark of Westerbeke Corporation

Copyright © 2004-2019 Moyer Marine Inc.

All Rights Reserved