Go Back   TeamTalk > Maintenance Tips, How-tos and Refurbishing Topics > Engine / Drive Train

Reply
 
Thread Tools Display Modes
  #1  
Old 02-08-2012, 02:55 AM
Thaiwake Thaiwake is offline
TT Newbie
 
Join Date: Jul 2010
Boat: Mastercraft X Star 2004, Indmar MCX 5.7L
Location: Southeast
Posts: 18
Water in oil

Hello,

I am having trouble with my 2004 MCX on my X Star. I bought the boat after it had been run in saltwater and have been restoring the engine. I put an orca cooling system in it that runs coolant through the engine block and raw water through the heat exchanger and out the exhaust.

I think it is the exhaust cooling water backing up in the engine. I did a compression test and found no compression on the number 3 cylinder. Took the head off and found an intake valve stuck open.

The other cylinders were fine but I am thinking that because of the lack of pressure from this cylinder the exhaust cooling water has been sucked back into the engine and mixed with the oil. I had new head gaskets and can't see any external cracks or damage to the block, although I can't be sure there isn't anything internal.

Looking back down the cast iron exhausts, which are also new, I can see rusty water droplets both outside the jacket and inside. There shouldn't be water running inside so I can only assume that it is somehow getting there from the outside of the exhaust.

Is it likely that the engine can suck water if there is a lack of compression on only one cylinder?

Does anyone else have any idea on how water can be getting into the oil?

Thanks in advance!
Reply With Quote
  #2  
Old 02-15-2012, 11:49 PM
Thaiwake Thaiwake is offline
TT Newbie
 
Join Date: Jul 2010
Boat: Mastercraft X Star 2004, Indmar MCX 5.7L
Location: Southeast
Posts: 18
Released the stuck Intake valve and the engine is running great again. I was suprised that a stuck valve would cause so much water to be sucked into the engine. Incase anyone has any problems with water in the oil and it isn't because of the head gasket or block, then do a compression check and make sure there is full compression on all cylinders, a loss of compression will cause the exhuast water to back up into the engine.
Reply With Quote
  #3  
Old 02-16-2012, 08:21 AM
NatesGr8's Avatar
NatesGr8 NatesGr8 is offline
TT Enthusiast
 
Join Date: Jul 2004
Boat: 05 X-45
Location: CT
Posts: 465
Thanks for the follow up. How do you like your closed cooling system?
__________________
Guns don't kill people, I kill people
Reply With Quote
  #4  
Old 02-16-2012, 08:42 AM
thatsmrmastercraft's Avatar
thatsmrmastercraft thatsmrmastercraft is offline
MC Master Poster
 
Join Date: Sep 2008
Boat: 1977 Stars & Stripes
Location: St. Paul, MN
Posts: 13,902
Did you determine the cause of the valve to become stuck? Bent valve?
__________________
Peter

Tandem Axle Trailer Special
Includes: 4 T07 wheels, 4 ST205/75R14 Kenda
Loadstar KR03 Radial tires, mount and balance
Free Delivery


ALUMINUM WHEEL AND TIRE PACKAGES
SINGLE AXLE 14" PACKAGE STARTING AT $369
SINGLE AXLE 15" PACKAGE STARTING AT $439
TANDEM AXLE 14" PACKAGE STARTING AT $649
LED lights, Spare Tire Carriers, Chrome & Powder Coated Lug Nuts
GOLF CART TIRES & WHEELS

PM me or email tiresplease@gmail.com
Reply With Quote
Reply

Tags
compression, mcx, oil, valve, water

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


All times are GMT -4. The time now is 09:04 PM.