[phpBB Debug] PHP Warning: in file [ROOT]/includes/bbcode.php on line 483: preg_replace(): The /e modifier is no longer supported, use preg_replace_callback instead
[phpBB Debug] PHP Warning: in file [ROOT]/includes/bbcode.php on line 483: preg_replace(): The /e modifier is no longer supported, use preg_replace_callback instead
[phpBB Debug] PHP Warning: in file [ROOT]/includes/bbcode.php on line 483: preg_replace(): The /e modifier is no longer supported, use preg_replace_callback instead
[phpBB Debug] PHP Warning: in file [ROOT]/includes/bbcode.php on line 483: preg_replace(): The /e modifier is no longer supported, use preg_replace_callback instead
[phpBB Debug] PHP Warning: in file [ROOT]/includes/bbcode.php on line 483: preg_replace(): The /e modifier is no longer supported, use preg_replace_callback instead
[phpBB Debug] PHP Warning: in file [ROOT]/includes/bbcode.php on line 483: preg_replace(): The /e modifier is no longer supported, use preg_replace_callback instead
[phpBB Debug] PHP Warning: in file [ROOT]/includes/bbcode.php on line 483: preg_replace(): The /e modifier is no longer supported, use preg_replace_callback instead
[phpBB Debug] PHP Warning: in file [ROOT]/includes/bbcode.php on line 483: preg_replace(): The /e modifier is no longer supported, use preg_replace_callback instead
[phpBB Debug] PHP Warning: in file [ROOT]/includes/bbcode.php on line 483: preg_replace(): The /e modifier is no longer supported, use preg_replace_callback instead
[phpBB Debug] PHP Warning: in file [ROOT]/includes/bbcode.php on line 483: preg_replace(): The /e modifier is no longer supported, use preg_replace_callback instead
[phpBB Debug] PHP Warning: in file [ROOT]/includes/bbcode.php on line 483: preg_replace(): The /e modifier is no longer supported, use preg_replace_callback instead
[phpBB Debug] PHP Warning: in file [ROOT]/includes/bbcode.php on line 483: preg_replace(): The /e modifier is no longer supported, use preg_replace_callback instead
[phpBB Debug] PHP Warning: in file [ROOT]/includes/bbcode.php on line 483: preg_replace(): The /e modifier is no longer supported, use preg_replace_callback instead
[phpBB Debug] PHP Warning: in file [ROOT]/includes/bbcode.php on line 483: preg_replace(): The /e modifier is no longer supported, use preg_replace_callback instead
[phpBB Debug] PHP Warning: in file [ROOT]/includes/bbcode.php on line 483: preg_replace(): The /e modifier is no longer supported, use preg_replace_callback instead
[phpBB Debug] PHP Warning: in file [ROOT]/includes/bbcode.php on line 483: preg_replace(): The /e modifier is no longer supported, use preg_replace_callback instead
[phpBB Debug] PHP Warning: in file [ROOT]/includes/bbcode.php on line 483: preg_replace(): The /e modifier is no longer supported, use preg_replace_callback instead
[phpBB Debug] PHP Warning: in file [ROOT]/includes/bbcode.php on line 483: preg_replace(): The /e modifier is no longer supported, use preg_replace_callback instead
[phpBB Debug] PHP Warning: in file [ROOT]/includes/bbcode.php on line 483: preg_replace(): The /e modifier is no longer supported, use preg_replace_callback instead
[phpBB Debug] PHP Warning: in file [ROOT]/includes/bbcode.php on line 483: preg_replace(): The /e modifier is no longer supported, use preg_replace_callback instead
[phpBB Debug] PHP Warning: in file [ROOT]/includes/bbcode.php on line 483: preg_replace(): The /e modifier is no longer supported, use preg_replace_callback instead
[phpBB Debug] PHP Warning: in file [ROOT]/includes/bbcode.php on line 483: preg_replace(): The /e modifier is no longer supported, use preg_replace_callback instead
[phpBB Debug] PHP Warning: in file [ROOT]/includes/bbcode.php on line 483: preg_replace(): The /e modifier is no longer supported, use preg_replace_callback instead
[phpBB Debug] PHP Warning: in file [ROOT]/includes/bbcode.php on line 483: preg_replace(): The /e modifier is no longer supported, use preg_replace_callback instead
[phpBB Debug] PHP Warning: in file [ROOT]/includes/bbcode.php on line 483: preg_replace(): The /e modifier is no longer supported, use preg_replace_callback instead
[phpBB Debug] PHP Warning: in file [ROOT]/includes/bbcode.php on line 483: preg_replace(): The /e modifier is no longer supported, use preg_replace_callback instead
[phpBB Debug] PHP Warning: in file [ROOT]/includes/functions.php on line 4860: Cannot modify header information - headers already sent by (output started at [ROOT]/includes/functions.php:3850)
[phpBB Debug] PHP Warning: in file [ROOT]/includes/functions.php on line 4862: Cannot modify header information - headers already sent by (output started at [ROOT]/includes/functions.php:3850)
[phpBB Debug] PHP Warning: in file [ROOT]/includes/functions.php on line 4863: Cannot modify header information - headers already sent by (output started at [ROOT]/includes/functions.php:3850)
[phpBB Debug] PHP Warning: in file [ROOT]/includes/functions.php on line 4864: Cannot modify header information - headers already sent by (output started at [ROOT]/includes/functions.php:3850)
BigLake411.com • View topic - Compression Test

  • Advertisement
Egret Baits

Compression Test

General boating discussion (boats, motors, marine electronics & accessories)

Compression Test

Postby lsufansr08 » Thu Aug 23, 2012 12:04 pm

Ive got a 40 Hp merc 3 cylider. Been haveing trouble starting, and with it missing. it also overheats. So i did a compression test. It shows 72-75 lbs on all three cylinders. Seems to me that it should be higher, but is it strange for all three to have the same amont of low compression. Just brainstorming, hopefully some one can help me with this problem.
lsufansr08

 
Posts: 24
Joined: Tue Feb 23, 2010 8:25 pm

Re: Compression Test

Postby Ray » Thu Aug 23, 2012 5:39 pm

It does sound low. May have ran lean on 2 cycle oil if they are all the same.
It should start and run, but won't have much power.
You could also have bad reed valves if it is low.
User avatar
Ray
Site Admin
 
Posts: 1643
Joined: Sat Oct 03, 2009 10:40 pm
Location: Lake Charles, La.

2009 Cobia 19 Bay

Re: Compression Test

Postby gerald » Fri Aug 24, 2012 3:15 pm

It could be that the gauge is reading wrong.

If you know someone with an outboard......try checking there compression with your gauge.

Go to the Merc web site and see what the compression should be on a new engine. They only show information on 2012 or 2013 engines and your's is probably a few years old......but should be about the same.
gerald

 
Posts: 316
Joined: Fri Jun 11, 2010 10:45 pm

Re: Compression Test

Postby lsufansr08 » Fri Aug 24, 2012 4:13 pm

Thanks ray. That's way I was afraid of. I'm sure that's a pretty costly fix. Appreciate you always keeping up with the post
lsufansr08

 
Posts: 24
Joined: Tue Feb 23, 2010 8:25 pm

Compression Test

Postby JAdams » Fri Aug 24, 2012 10:54 pm

It's prolly gauge is wrong I find it odd u would blow all 3 cylinders and have even compression on all 3 40 merc between 110 and 125 as long as there all even ur good
Adams Trophy Charters
Capt. Jared Adams
(337) 513-2760
User avatar
JAdams

 
Posts: 1163
Joined: Sun Aug 01, 2010 7:19 am

Compression Test

Postby JAdams » Sat Aug 25, 2012 2:52 pm

Thermostat sticks in those a lot
Adams Trophy Charters
Capt. Jared Adams
(337) 513-2760
User avatar
JAdams

 
Posts: 1163
Joined: Sun Aug 01, 2010 7:19 am


Return to The Boat Shed

Who is online

Users browsing this forum: No registered users and 1 guest

  • Advertisement
Majek Boats
cron