SoCal Jet Boats

Tech Talk => Engine Mechanical / Electrical => Topic started by: 79charger on April 14, 2009, 04:17:36 PM

Title: Water in oil ??
Post by: 79charger on April 14, 2009, 04:17:36 PM: Bought a 79 22ft charger last year with a harman marine bbf . Ran great all last summer , put the boat away for the winter and took it out 2 weeks ago to silver wood . changed the oil when i got home and it was dark grey . Is this a sign of a blown head gasket .Pretty new to the jetboat scene and wanted some advice before i went pulling the heads . Thanks
Title: Re: Water in oil ??
Post by: JWBOYER21 on April 14, 2009, 04:19:35 PM: blown head gasket would be the number one solution if it was real milky
Title: Re: Water in oil ??
Post by: HDriderTH on April 14, 2009, 04:21:33 PM: One of the jet guys will chime in about water pressure and releif valves and stuff any minute.
Title: Re: Water in oil ??
Post by: Marcsrollin on April 14, 2009, 04:24:00 PM: Intake manifold gasket!!
Title: Re: Water in oil ??
Post by: 79charger on April 14, 2009, 04:30:57 PM: should i replace the intake gasket first because its cheaper and easier access ? It didnt seem like a substantial amount of water in the oil just a real dark gray .
Title: Re: Water in oil ??
Post by: Marcsrollin on April 14, 2009, 04:34:37 PM: You have to take off the intake to get the heads off , so when you do check to see if there is a obvious leak in the gasket before you pull the heads.
Don't always assume the worst!
Title: Re: Water in oil ??
Post by: JWBOYER21 on April 14, 2009, 04:35:39 PM: Quote from: Marcsrollin on April 14, 2009, 04:34:37 PM
You have to take off the intake to get the heads off , so when you do check to see if there is a obvious leak in the gasket before you pull the heads.
Don't always assume the worst!

always assume the worst! :P then be thankful when it not ;D
Title: Re: Water in oil ??
Post by: electrowoman on April 14, 2009, 04:48:50 PM: If you ran it with last years oil I would take it out for a short run again with the fresh.
You may have just cleaned out the winters worth of condensation.
Title: Re: Water in oil ??
Post by: osbo68 on April 14, 2009, 04:52:50 PM: What type of exhaust do you have?? Milkshaked my oil real bad last fall... My first thought was head gasket... :mad: Ended up being the spring in my Basset t-valve was bad... First thing you should do is run a compression test... Depending on how old the motor is it's not uncommon to see a variation of 10 to 15 pounds between all 8 cylinders. Now if you have one or two that are way low then the possibility of a head gasket is real... Good luck.. Andrew
Title: Re: Water in oil ??
Post by: Ralph Brunt on April 14, 2009, 07:06:05 PM: you say grey and not white, to me that would indicate condensation. change oil again and try to get the heat up. oh yeah, did the oil level rise ??? if you had water in it, it would rise
Title: Re: Water in oil ??
Post by: 79charger on April 14, 2009, 07:57:20 PM: i have harman marine water logs, i did notice that one of my exhaust flaps was gone i wonder if water could have flushed in the motor when slowing down . Well i will take it out one more time with clean oil when the weather permits , 60 mph gust today at my house . Thanks
Title: Re: Water in oil ??
Post by: jet boat performance on April 14, 2009, 08:47:13 PM: Quote from: 79charger on April 14, 2009, 07:57:20 PM
i have harman marine water logs, i did notice that one of my exhaust flaps was gone i wonder if water could have flushed in the motor when slowing down . Well i will take it out one more time with clean oil when the weather permits , 60 mph gust today at my house . Thanks

Missing exaust flappers can be responsible for "milking oil" , sounds like your on the right track to diagnosis Tom

Old addage re diagnosing anything say "when you here hoofbeats think Horses not Zebras" ;D