water in oil
Printed From: CorrectCraftFan.com
Category: Repairs and Maintenance
Forum Name: Engine Repair
Forum Discription: Engine problems and solutions
URL: http://www.CorrectCraftFan.com/forum/forum_posts.asp?TID=30940
Printed Date: October-08-2024 at 9:17pm
Topic: water in oil
Posted By: subpainter
Subject: water in oil
Date Posted: July-27-2013 at 11:39pm
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took the boat out yesterday for the second time this year, it is a 85 SN. the first time I went out was a test run and everything seemed to run fine was only out for about an hour or so no problems. yesterday after we had been out for about an hour and a half it started running rough and hesitating, temp seemed fine never went above 150-160. Got home and pulled the dipstick and it was a creamy mess plus when I opened the engine cover I noticed a little oil mixed with water on the up side of the bilge but could not see where it came from on the engine. both exhaust manifolds are cracked and leak water so I am pulling those to replace them. also I pulled the spark plugs and none of them were fouled they all looked very clean. will check the compression later tonight and post the results. Any thoughts / suggestions would be greatly appreciated. the people on this forum seem to have a great deal of hard earned knowledge. Thanks in advance Tim 
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Replies:
Posted By: SNobsessed
Date Posted: July-28-2013 at 8:57am
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Maybe you will be lucky & the water source is the manifolds. Replace them, change oil several times, & run it again. ------------- “Beer is proof that God loves us and wants us to be happy.” Ben Franklin |
Posted By: 63 Skier
Date Posted: July-28-2013 at 1:59pm
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Yes, hopefully it's the manifolds. The combination of water in the oil and rough running makes me wonder a bit though whether it could be an intake gasket or something else. When you change the oil, it's hard to get the oil/water mess out with just oil. I'd add one of the engine flush products or a quart of diesel fuel or kerosene in place of one quart of oil. Run the engine 5 minutes at 1000 rpm max, then drain and refill with new oil and filter. Even after that, once you're sure you've got your problem solved, I'd do one more quick oil change after a few hours of run time. ------------- '63 American Skier - '98 Sport Nautique |
Posted By: subpainter
Date Posted: July-29-2013 at 2:13am
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performed a compression check today had to perform it cold as I had already pulled the manifolds to replace them. Here are the results 1. 100 2. 120 3. 90 4. 120 5. 105 6. 80 7. 120 8. 120 any thoughts? Tim |
Posted By: 63 Skier
Date Posted: July-29-2013 at 11:21am
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Maybe on the low side, but gauges definitely vary. With your high of 120 you might want to see a low of 90 (75% of the high) so #6 with 80 might be suspect. But, are these numbers with the milkshake oil still in the engine? ------------- '63 American Skier - '98 Sport Nautique |
Posted By: Tim D
Date Posted: July-29-2013 at 12:17pm
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Run it and then take #3 and #6 plugs out and shoot some air in and see if any water comes out. Also cracked ceramic on the plug is a sign of water. ------------- Tim D |
Posted By: subpainter
Date Posted: July-29-2013 at 2:24pm
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63 Skier yes it was with the water still in the oil. I guess what I am wondering is should I put the new exhaust manifolds on and change the oil and see what happens or do these numbers justify taking the heads off for a rebuild. Thanks Tim |
Posted By: TRBenj
Date Posted: July-29-2013 at 4:11pm
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I'd say its time for a leakdown test to determine the source of your low compression. How long have the exhaust manifolds been cracked? If theyve been letting water into the cylinders for a while, it wouldnt surprise me if the exhaust valve seats are rusted and causing your lower compression numbers. ------------- |