need big help asap motor down

J

jimjj

New Member
Aug 27, 2009
25
k here it is bought a 1986 searay sundnacer week ago the guy started it run it i checked the oil looked fine took it straight to lake ran it for 30 minutes took it to slipwent back 2 days later would not staert after a lot of checking other things foundout motor was full of water engine was stuck brought it home yesterday pulled plugs drained oil sprayed pb blaster in all cyl put new oil in it i have it turning now good have felt all over exhaust manifold cant find any cracks visually the motor is a 350 small block merc if htese exhaust gaskets blow can it let water in oil? there was also water and oil in bilge area under motor the guy swears he had the boat on lake week befor no problems???? are the manifolds bad to crack internally? should i put plugs back in start and try to find leake or just take both manifold and risers off and have checked? thanks in advance for help
 
I would say first, throw a couple of periods in there.

second, sounds like you're going to have to start taking things apart to find what went.
 
yes a problem with those exhaust gaskets will let water in there but at least it was good for you because the motor wasnt running when the water got it in there it could have really been a messy and expensive repair if that happened now that you have it dried out you will need to take the exhaust apart to see if there are any bad parts leaking water they are like tubes inside of tubes and the inner tube might be where the leak is so you cant see it you can inspect the risers and elbows when you put the new gaskets in good luck and let us know how everything goes
 
k glad some one could read LOL....... k boat was running when i turned it off i checked oil when i bought it there was no water in oil that i could tell. dont know if water was in it while i was running i ran it for approx 30 minutes next day when found the problem the boat would not start it was hydro locked i was told like i said i drained oil took plugs out. sparayed pb blaster in cyl holes let sit put new oil back in got motor loose my questions were. will a blowed manifold gasket let lots of water in oil? or is it more likely a cracked manifold? iam going to pull both of them off soon have checked. i was told that this happening would not hurt rest of motor? is that right? like i said the guy said he had the boat on lake week befor and that there was no way it was a cracked block???
 
Jim, it's not that we are incapable of reading. It's just awful hard to do it when there are run-on sentences, no capitalization, etc. Please, I'm not saying you have to go and check your copy of Strunk & White before making a post, but a little more attention to detail will help immensely.

Could an engine with a cracked block still run? It could. It just depends on the crack. In theory, the frost plugs should pop out before the block cracks. But, I can't say the last time I've seen a cracked block that has cooperated with this theory.:smt001
 
My port engine (just replaced this past spring) was hydro locked due to a cracked head. I could not tell if water was in the oil from the dipstick, just looked like too much oil. Once I started to drain it with the vaccu change I immediately saw the milky oil.
Trouble shooting the motor I changed the oil and ran the motor to see if it would replicate...it took about 30 minutes or so of running on fresh oil before it hydro locked again. I guess it all depends on how many and how big the cracks are letting the water in the engine.
 
:huh:yes it is broken now you have a boat to fix get to work and tell us what you did.:thumbsup:
jimjj said:
k glad some one could read LOL....... k boat was running when i turned it off i checked oil when i bought it there was no water in oil that i could tell. dont know if water was in it while i was running i ran it for approx 30 minutes next day when found the problem the boat would not start it was hydro locked i was told like i said i drained oil took plugs out. sparayed pb blaster in cyl holes let sit put new oil back in got motor loose my questions were. will a blowed manifold gasket let lots of water in oil? or is it more likely a cracked manifold? iam going to pull both of them off soon have checked. i was told that this happening would not hurt rest of motor? is that right? like i said the guy said he had the boat on lake week befor and that there was no way it was a cracked block???
Click to expand...
 
Take 2 of whatever the doctor gave you and check back with us in the morning...

Hope you get well soon....

Michael
 
questions still not answered read and respond to them not jokes this is serious...... first off there was no water in oil when i checked it when i bought it..... took it to lake ran for 30 minutes..... took it to slip did not try to start it no more that day...... went back to start it next day it would not start........ i was told when water was leaking into oil that it would run till you shut it off...... thats when it will hydro lock.... iam trying to find the problem do you think it could be gasket or cracked manifold???? answer this
 
Mine hydro locked when I was underway. It shut off and would not turn over after that (hydro locked).
I didn't see any water in the oil on the dip stick either, only when I drained it was it apparent.
 
You could have blown a headgasket...if one of the cylinders is filled with water. Could be exhaust manifold, riser, intake manifold. Unless you have a big problem, you may not see water in the oil.

Take it apart and you will find the problem. Was this always a fresh water boat? The headgaskets do rot out over time...maybe 10 - 15 years before heads are required for a saltwater boat.

Should take you about 3-4 hours to get the heads off.
Good Luck
 
the guy i got it from used in lake dont know if it was ever in salt water... when i took the spark plugs out water ran out of several cylinders iam going to take manifolds off first see if i can see anything there.... the oil was very milky but motor was not ran after i found it... it would not start or even turn over i drain oil spayed all 8 cylinders with pb blaster put new oil in jumper it and now its turning goood again... i just need to find out why water got in it to begin with
 
If you got water in a couple of cylinders, it probably the manifold/risers. The water should be on one bank only. You could have also bent a rod or cracked the block with this type of failure. The only think you can do, is to get a pair of new manifolds and risers and bolt them back on. You can also do a compression check on the engine. should be 120 to 135 psi. If one is low you have other issues and you should pull the heads. You should do the pressure check first.

4 hours should get the heads off assuming nothing is rusted.
Good Luck.....
 
ok update i have took the manifolds off no noticable cracks ... have not took the risers off yet... gaskets also looked good not blowed i think when i took them off both had water in them?? do they usally crack at motor or inside riser? motor was running befor this when i ran it for 30 min approx i did not hear anything like a rod and it was not running hot?
 
Its difficult to spot a leak in a manifold system. If you have the manifolds off, pull of the center wire from the distributor and coil and then check the compression. If the compression for each cylinder is within spec, go out and buy new manifolds and put them on.
Good Luck
 
k update took risers off the manifolds the one off of passenger side motor has a visible crack in the middle 2 cyl holes down inside the manifold were the fin is bout 2"long you can see it from the port were the riser bolts on would this fill my block full of water??? both risers and manifolds have a lot of rust inside them aslo
 
Last edited:
jimjj said:
k update took risers off the manifolds the one off of passenger side motor has a visible crack in the middle 2 cyl holes down inside the manifold were the fin is bout 2"long you can see it from the port were the riser bolts on would this fill my block full of water??? both risers and manifolds have a lot of rust inside them aslo
Click to expand...

Before going any further,as stated a compression test is in order.....it is possible for water to make it to the crankcase thru the cylinder,but not likley in the amount you mention,unless something is cracked.
 
Good news....but if you have lots of water in your block, you may have cracked the block too. It happened to my 300DA. The water has no place to go when compressed, so the cylinder liner cracks to relieve the pressure.

A compression check will rule this out.
 
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