Go Back  Offshoreonly.com > Technical > Do It Yourself, Boating on a Budget
Mercruiser 454 Mag Reversion? >

Mercruiser 454 Mag Reversion?

Notices

Mercruiser 454 Mag Reversion?

Old 03-28-2024, 02:56 PM
  #1  
Registered
Thread Starter
 
Join Date: Sep 2023
Posts: 26
Received 1 Like on 1 Post
Default Mercruiser 454 Mag Reversion?

I have fresh build -1990 Mercruiser 454 mag with Comp roller cam. Xtreme marine 11-445-8.
Today i test run about 30mins, everythin is ok.
When i check oil dipstick it have more oil than before.
I remove oil lines to cooler snd have milkshake...
Pressure tested oil cooler, it is ok. Then pressure tested 1.2bar engine water lines block,head,intake all is fine.
How water mixing oil?
Do i have too short exhaust pipes in my test bench an have reversion? Can water mix with oil in reversion?
There is some video my engine running today:
edit: i cant link my video here, because im new but here it is, put letter "h" before ttps then it work.

ttps://youtu.be/UOshK1t-ZlM?feature=shared

Last edited by marko84; 03-28-2024 at 03:06 PM.
marko84 is offline  
Old 03-28-2024, 05:43 PM
  #2  
Registered
iTrader: (1)
 
Join Date: Nov 2009
Location: KY
Posts: 4,102
Received 471 Likes on 367 Posts
Default

Then pressure tested 1.2bar engine water lines block,head,intake all is fine.
Tell use how are you doing this?
AllDodge is offline  
Old 03-28-2024, 06:42 PM
  #3  
Registered
 
Join Date: Jan 2006
Location: taxachusetts
Posts: 3,092
Received 698 Likes on 352 Posts
Default

can the water mix,,yes
are there any exhaust leaks in the system?does it miss fire while idling?
sutphen 30 is offline  
The following 2 users liked this post by sutphen 30:
articfriends (03-29-2024), marko84 (03-28-2024)
Old 03-28-2024, 06:48 PM
  #4  
SB
Registered
iTrader: (1)
 
Join Date: Nov 2004
Location: On A Dirt Floor
Posts: 13,540
Received 3,114 Likes on 1,402 Posts
Default

Here is a better link to the vid:
SB is offline  
The following users liked this post:
marko84 (03-28-2024)
Old 03-28-2024, 06:58 PM
  #5  
Registered
iTrader: (3)
 
Join Date: Apr 2005
Location: Lees Summit ~ LOTO 10MM
Posts: 2,981
Received 121 Likes on 65 Posts
Default

Engine and oil not getting up to temp. Condensation forms and you get a milkshake. Fought it on some NA 555s and really had me scratching my head. If its running well Id put it in the boat and run it under load. Bet the problem goes away. Obviously after you change the oil before putting it in the boat. 🤣
endeavor1 is online now  
The following 2 users liked this post by endeavor1:
marko84 (03-28-2024), regalman4925 (04-01-2024)
Old 03-28-2024, 07:07 PM
  #6  
Registered
 
Join Date: Jan 2006
Location: taxachusetts
Posts: 3,092
Received 698 Likes on 352 Posts
Default

after seeing that video,,put more tilt into your engine when its running.the exhaust is way to flat,put more angle.
sutphen 30 is offline  
The following 5 users liked this post by sutphen 30:
articfriends (03-29-2024), Griff (03-29-2024), marko84 (03-28-2024), Ryan00TJ (03-30-2024), SB (03-28-2024)
Old 03-28-2024, 07:32 PM
  #7  
SB
Registered
iTrader: (1)
 
Join Date: Nov 2004
Location: On A Dirt Floor
Posts: 13,540
Received 3,114 Likes on 1,402 Posts
Default

Originally Posted by sutphen 30
after seeing that video,,put more tilt into your engine when its running.the exhaust is way to flat,put more angle.
I agree and idle rpm maybe a tad too low. 800ish should be okay.

Last edited by SB; 03-28-2024 at 07:34 PM.
SB is offline  
The following users liked this post:
marko84 (03-28-2024)
Old 03-28-2024, 11:33 PM
  #8  
Registered
Thread Starter
 
Join Date: Sep 2023
Posts: 26
Received 1 Like on 1 Post
Default

Originally Posted by sutphen 30
can the water mix,,yes
are there any exhaust leaks in the system?does it miss fire while idling?
I Think it have some miss fire, before it warms. No exhaust leaks. I check spark plugs, number 4,5,6 has water sparkle and exhaust elbow have some little rust on exhaust side.
marko84 is offline  
Old 03-28-2024, 11:42 PM
  #9  
Registered
Thread Starter
 
Join Date: Sep 2023
Posts: 26
Received 1 Like on 1 Post
Default

Originally Posted by AllDodge
Tell use how are you doing this?
Blocked water hoses which goes to risers and exhaust manifolds, then i make diy tool with pressure gauge, car tire valve, some hoses and attach that system to oil cooler water hose that goes in the engine. Then put air compressor 1.2bar in the system.
marko84 is offline  
Old 03-28-2024, 11:47 PM
  #10  
Registered
Thread Starter
 
Join Date: Sep 2023
Posts: 26
Received 1 Like on 1 Post
Default

Originally Posted by endeavor1
Engine and oil not getting up to temp. Condensation forms and you get a milkshake. Fought it on some NA 555s and really had me scratching my head. If its running well Id put it in the boat and run it under load. Bet the problem goes away. Obviously after you change the oil before putting it in the boat. 🤣
Maybe that is true, but there is somethink else too. Im using now engines 2x20mins. 20mins yesterday and 20mins week ago and oil is like cream. Condensation forms some water to oil, but not that much.
marko84 is offline  

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

Copyright © 2024 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.