What I believe to be water coming out of plug 4 when compression testing 1 2 and 3

[bking507]

So I got the on the water for the first time yesterday. Only went about half a mile. It started to run at about 200. Tore off all the hoses and found a chunk of in the smaller hose going to the riser. Ran it on muffs and got it to stay steady at 170 at about 3000 rpm. Thought I had it all ready to go for the day. Went out and checked oil this morning and it was like a milkshake on the cap and dipstick. After reading other things decided to compression test this morning see if it was head gasket. Undid all the plugs unhooked coil and started on number 1 after two rotation what I believe is water was shooting out of number 4 plug. What would cause this to happen

 

[alldodge]

Water in cylinders on first start up is normally improper winterization and things cracked

 

[bking507]

I just bought it last summer and took it to Mach to have transom coupler yokes and gimbal bearing replaced they had the motor out all winter. Where it was stored I'm not sure but if they left it outside it gurenteed it froze. Live in Minnesota. Tsat was also done. Where should I start looking. Compression test was 150 on all except 2 which got up there but bleed out I'm guessing it wasn't tight enough. Otherwise I tried 4 and it shot to like 240 after 2 cranks

 

[bking507]

Ok I rechecked all cylinders 150 on 1 up 180 on 2 but doesn't hold pressure shots of water coming out 4 3 is only at 80 no water out of four. 4 was at 150 now

 

[alldodge]

Sounds to me its cracked and Mach should be responsible, but don't know if they would back it up.

In any case the motors has to come out, or at least pull the heads to start

 

[bking507]

Just took the riser off filled the small port with water. Came out exactly where it should. Exhaust manifold has standing water in the exhaust port

 

[bking507]

Manifold or the block

 

[alldodge]

Your running on muffs, so right now I think its the block or intake manifold with the issue

 

[bking507]

I just tore off the manifold it had standing water in it. Dried it out and filled the inlet 1in of standing water again pretty sure it is the manifold. Going to check around for crack in block but not seeing any but the manifold intake. Where else should I be looking

 

[bking507]

What would be the best way to test for a block leak. If I made a plug to pump some compressed air through would that tell me

 

[bking507]

Sorry in the oil fill tube

 

[alldodge]

Not knowing what motor, disconnect hoses going to exhaust and plug them. Plug hose connecting at thermostat housing coming from drive and attach a schrader valve. Pressurize to 15 psi

 

[bking507]

Sorry it's is volvo penta 3.0 with a holley 2barrel carb. Do I need to take of tstat housing and plug in to that

 

[alldodge]

No, don't take the thermostat housing off

Drain the block of all water.
Remove hose coming from the drive and make up a fitting with a schrader valve. Disconnect the hose going to the exhaust manifold and plug it

 

[bking507]

The exhaust manifold is already off the motor along with carb alternator and riser. I found the exhaust port half full of water guessing it is cracked. I drained all the water and filled the inlet with a hose and It filled up again.

 

[bking507]

Without it on there am I not going to be able to pressure test it

 

[bking507]

Also since I've already got it this far apart should I just do the head gasket too. Any recommendations on best way to clean all the milky sludge out of the motor without have to tear the entire motor apart. Pressure test was 150 on 1 160 on 2 90 on 3 and 140 on 4

 

[alldodge]

The intake doesn't need to be on to pressure test. The hose that goes from the thermostat to the intake, plug it

Only way to get the water out is changing the oil, run a bit and change the oil. If the drain plug comes out you can get more out

The 90 isn't good

 

[cptbill]

Just my 2 cents worth, On VP engines the gasket between the exhaust manifold and the riser if factory is a metal gasket. I have had that gasket go bad on the 5.7 's in my Larson and had the risers and manifolds tested thinking that had to be the problem, of Corse I will say that was in salt water. Just something else to check

 

[bking507]

i made a fitting and tested the block it seems to be holding steady at 15 not hearing any hissing and still pressure when i push on the valve. i was figuring that with the low compression on number 3 that if the rings or head gasket was bad i would hear something since the plugs are still out.
cptbill I don't believe mine was metal more of an alum pressed together but then i had a normal gasket metal restrictor plate the another gasket. why there was two on top of each other i am not sure. I am hoping a new manifold will do the trick. my kids have been on me about this boat i was always talking about just wait it will be fun sat in the shop for over a year and finally got it back after the holiday. i took it out for all of ten minuets and i now it is even worse because it sits out front and i still have to tell them we cant take it out.
to high hopes and low expectations