Possible cracked block

[johnnyutah35]

Hello and thank you in advance for looking/replying. I have been given a 1985 Sea Ray 197 Monaco with a Mercruiser 260 Engine. The backstory is about 4 years ago it was not properly winterized and when my buddy and I went to fire it up it ran great for about 5 minutes and then a brown goo similar to a thick Yahoo or chocolate milk came spilling out under the carburetor cover (I believe). My buddy never did anything with the boat and put it in storage and moved away. This past winter he said he didn't want to put any money or work into it and gave it to me. I would like to get it running and on the water this summer and do most of the work myself. I have a friend that is an engine guy so he would help me throw a new one in it if necessary. My question is where do I start, I have looked up doing a compression test but could not find a complete guide on how to perform one. There are no visible cracks from the outside but I have been told a compression test would tell me if I have a cracked block. I included a picture of where the water/oil mixture was coming from but this is just a general picture, not my engine. Thanks for any advice on where to start!

 

[Scott Danforth]

I would pull the motor and drop in a new REMAN long-block and go boating. assume you need new exhaust manifolds as well.

with it being a 1985, your choice is stay with the 2-piece RMS crank or upgrade. I would upgrade to a 1996 or newer long-block and simply change the coupler to match the new crank/flywheel.

 

[Bondo]

I have a friend that is an engine guy so he would help me throw a new one in it if necessary.

Ayuh,...... Welcome Aboard,..... A compression test won't find a cracked block,.....

Ya need a new long block, then swap over the salvageable accessories off the motor in there,.....

Probably gonna need exhaust manifolds too,....

 

[Scott Danforth]

proper way to pull a boat motor.
remove outdrive
disconnect fuel, exhaust hoses, water supply hose, wiring harness, shift cable, throttle cable and battery cables
unbolt front mounts and two rear mounts
lift motor out

 

[johnnyutah35]

Thanks guys for taking a look and giving your thoughts, not what I wanted to hear but I was hoping for the best and expecting the worst. Any good leads on where a good source for a 350 long block might be? Also a good source for the exhaust manifolds? I have been looking on www.car-part.com a little but I will expand my search.

 

[HT32BSX115]

Any good leads on where a good source for a 350 long block might be? Also a good source for the exhaust manifolds? I have been looking on www.car-part.com a little but I will expand my search.

A wrecking yard can be a great source for a good running 350 truck engine. You can get the manifold/riser kits right here on iBoats!