dry sunk

[jtboats]

1986 mercrusier 260 580hrs
I bought this boat this summer as a restoration w/t my son
when i looked at the boat there was water in the boat on the trailer up to the storage in front full looked at the engine was surprised how well the engine looked .
the owner tried to start the engine with starting fluid i was not there !
when i got the boat home there was water in the gas tank 20 gal 38 gal tank
a screw was missing in the regulator
engine had water in oil figured it seeped in through the pan gasket
i changed the oil ran the engine checked the compression 120 in all but #3 was @ 90psi .
checked the dip stick oil looked fine was happy went to change oil oil yesterday to take boat out for a run oil was a lil milky not as bad as the last time pulled all the plugs all looked ok pulled the hoses off the thermostat housing connected a garden hose to the with a spliter drained the oil and was looking for water draining from the oil pan and cylinders nothing! left it ove nite nothing !:
could this be residue from the dry sink ? what is the best way to flush it to make sure befror i break it down

 

[RWilson2526]

Re: dry sunk

Dont know enough to help but I bet the experts are going to make alot of comments about that 90 psi in cylinder #3.

 

[Robj]

Re: dry sunk

Once you drained the oil as best you can, I would take it out and run it for a day, keeping a close eye on the oil to make sure it does not get real milky. Afterwards check the oil, if it is again milky, you have water ingress problems. Also check the compression, both wet and dry, and see if the number change. If you still have 90 psi in #3, it may be a sign of a bad head gasket, which may also be where the water is coming from. I am sure others will chime in soon to give your their opinions. Welcome to iboats.

Have a great day,

Rob.

 

[jtboats]

Re: dry sunk

ok guys heres the deal
i took the hose off the exhaust manifolds hoses applied the garden hose used a hose spliter and closed the system
blocked all exhaust and water out to back up in engine once i applied full water
water came out of the plug holes im guessing head gasket but there was so much water it looked like the hose was in the cylenders omg ive been a mechanic for years never seen that much water come from a spark plug hole lol 4/8 /5/7 any where a valve was open for it to come through water could get in
it did i guess im tearing down the enging

would the risers gaskets do this much volume im going to start now ill be back thank all joe
ill be back joe

 

[Silvertip]

Re: dry sunk

Unless I'm misinterpreting how you fed water into the system, ff you back fed the engine through the risers you essentially shot water right into the engine. The same thing can happen if you are sailing along at full throttle and suddenly chop the throttle. Valve overlap can injest water. That's also the reason wild cams are not used in marine engines.

 

[f_inscreenname]

Re: dry sunk

A bad manifold can fill a motor with water in a minute. Take them off and fill them with water in their normal upright position. Look for water in the runners.
Unless water got up high enough inside the boat that it went over the dip stick I bet the water is coming from inside the motor. Manifolds are always the first suspect.

 

[jtboats]

Re: dry sunk

Unless I'm misinterpreting how you fed water into the system, ff you back fed the engine through the risers you essentially shot water right into the engine. The same thing can happen if you are sailing along at full throttle and suddenly chop the throttle. Valve overlap can injest water. That's also the reason wild cams are not used in marine engines.

omg i understand what i did
by blocking the exhaust and water from exiting the engine i let it back up til it flowed back to cylenders shoot well i guess i have to break it down and get to the bottom of this
i cant sell it like this thanks all ill keep you posted in what i find joe

 

[f_inscreenname]

Re: dry sunk

Everyone has these moments.

 

[jtboats]

Re: dry sunk

Hello Gents
Broke down the engine last night head gasket on # 3 side did look tired also the water port same side did look to be leaking .
I would not doubt it as the gasket were on the engine since or before 1986
or 600 rhs .And use in salt and fresh water
Some rust flaking in the heads and intake but the risers were replaced by the previous owner he told me that
I thing that they were trying to fix the same problem (i hope i don't have to replace the block but I will if need be but at this point i don't think so .
I'm only going to do this once but im not sure what the cost of checking the heads and manifolds
I'm asking if one of you has had this done and how much this will set me back hoping that all check out and gasket are the most expensive cost lol the rest i have done before i have t torque wrench but its a point style ill invest in a click type thanks to all ill let you know how it turns out

please let me know anything i can do my self like testing

i took the riser off of the exhaust manifolds so i guess i can buy new gaskets to check them the need new gaskets anyhow

Joe

 

[jtboats]

Re: dry sunk

Hello Guys
Joe Here
Heads Are Junk I Noticed Rusted Water Ports At The Edge Of Cylinder But I Had My Hope's Up !


I Took The Heads To Machine For Pressure Test And That Was The First Thing They Noticed With Out My Input
So I'm Going To Look At A Set Of Heads To Knight

A Set Of 882's Are For Sale With A 1.000 Miles N Them So Wish Me Luck

I Was Also Told The Origanal Heads Were Notorious For Warping Because Of Lack Of Cast Iron Between Bolt Hole At The Out Side Lower Bolts And They Know What To Look For They Have Seen This So Much
A 993 Or 882 Will Do The Job A 305 Head Is The Worst Thing You Could Use It Will Fail I'm Told

Joe