Compression test w/o turning off water thru-hull - SailNet Community

   Search Sailnet:

 forums  store  

Quick Menu
Boat Reviews  
Search SailNet 
Boat Search (new)

Shop the
SailNet Store
Anchor Locker
Boatbuilding & Repair
Hatches and Portlights
Interior And Galley
Marine Electronics
Other Items
Plumbing and Pumps
Sailing Hardware
Trailer & Watersports
Clearance Items

Advertise Here

Go Back   SailNet Community > On Board > Gear & Maintenance > Engines > Gas > Atomic 4
 Not a Member? 
Old 06-12-2006
Junior Member
Join Date: Jun 2006
Posts: 4
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
rbtmoon is on a distinguished road
Exclamation Compression test w/o turning off water thru-hull

I did a compression test on my FWC Atomic-4 without closing the sea water thru-hull valve. I replaced the plugs and tried to start the engine. After a few unsuccessful tries I consulted the web and discovered that I should have turned off the sea water thru-hull. Has the engine been damaged? Will it start? How?

Robert Moon
Reply With Quote Quick reply to this message Share with Facebook
Old 06-12-2006
hellosailor's Avatar
I've mislaid my Kraken!
Join Date: Apr 2006
Posts: 11,083
Thanks: 3
Thanked 110 Times in 107 Posts
Rep Power: 10
hellosailor has a spectacular aura about hellosailor has a spectacular aura about
"Has the engine been damaged?" That depends on how your exhaust is set up, and whether you pumped long enough to fill the waterlift and flood the engine. If you take out the spark plugs and run a cotton swab around in the cylinders, and it comes up with just normal oil/fuel and no water--you're probably OK. If there's any evidence of water in the cylinders, then you may have done damage. Also check the oil, make sure there is no milky foam indicating water got into it.
If you are feeling ambitious or cautious, you can remove the cylinder head to check for valve damage. Otherwise? I'd suggest draining the muffler (to make sure it isn't still too full) and then cranking the engine over (plugs out, water shut) to see if it sounds normal. If there are any odd noises, might be time to pull the head. If it sounds normal...then put the plugs back in and fire it up, gently, to see if it runs OK.
Without tearing it down, there's no definitive way I know of to make sure there is no damage. But if it runs OK, sounds OK, it probably is OK.
This is assuming it was OK to start with before you did the compression test. Was there a reason you were checking that?
Reply With Quote Quick reply to this message 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

Posting Rules
You may post new threads
You may post replies
You may post attachments
You may edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On

Similar Threads
Thread Thread Starter Forum Replies Last Post
Glassing hull GreenEarth General Discussion (sailing related) 18 06-20-2009 12:52 AM
Compression test w/o closing thru-hull water rbtmoon Atomic 4 0 06-12-2006 12:30 PM

All times are GMT -4. The time now is 07:38 PM.

Add to My Yahoo!         
Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2015, vBulletin Solutions, Inc.
SEO by vBSEO 3.6.1
(c) LLC 2000-2012

The store is owned and operated by a company independent of the forum. You are now leaving the SailNet forum. Click OK to continue or Cancel to return to the SailNet forum.