Different gauges will show a different reading on the same cylinder, but given the gauge is 'reasonably accurate', about 140psi. You also need to see that no cylinder varies by more than 10% from the others.
Yep. The guy who bought my old boat didn't even ask me to turn it on or water test it....he had a similar boat with identical (3.0) drive train but rotted floor and roached interior. He said he was paying me ($3400 for a 25 yr old boat) less than it would cost him to redo his boat...he figured worst case he would swap engines.
while good boats are hard to find due to market etc, you'd be a LOT better off, waiting till you can water test any boat you might want to buy. What you're doing is risky, even if the boat is very low priced.
Measuring quality of winterizing by whether there is any antifreeze in the motor can be meaningless. Depends on if the motor was properly winterized as to whether the antifreeze is actually in all the proper locations. Most people do not know how to make sure antifreeze actually gets into the motor and end up putting most all of it out the exhaust.
if it was properly winterized, there would be air in the water passages.
Or disco. LOL Yea way off topic but still good info. The only way I can think of " looking" at any wood that would be covered in fiberglass would be to use a IR camera. The only problem with that is I have know idea what I would be looking for with a IR camera.
Typically we take a drill and drill in from the inside, looking at the shavings that come out. Then fill the hole with 5200. One can also pull a motor mount bolt and see if the wood it is screwed into is mush or not. Typical places for first rot is lower part of transom, we drill in as close to bottom of keyhole bolts as we can. Next is motor mount and stringers. Also check the floor for soft spots. Old manufacturing techniques did not seal things up very well. Those of us who have redone floor, stringers and transom tend to make sure they are fully sealed.
Good info. Thanks. I did remove a transducer mount off the bottom of the transom to get a clue. The screws were large enough in diameter where I could see the wood was solid. I know what a keyhole is but keyhole bolt?
I didnt think to take any pics of the inside but wait until you see that. It has a kitchen, two "bedrooms" and a bathroom. O yea AC and heat and hot water.
Nope, they are the 'mid' era manifolds.
At the crankshaft, with MPI yes, but the one you photographed has a 2bbl carb, so more like 250hp (at the prop)....Can somebody please go to this website and look at the specs on the engine? They are claiming 325HP @ 4000 RPM! Would you believe that?
New 5.7L GM Marine Long Block Engine
This is a brand new Authentic General Motors heavy duty marine base engine. This 5.7L Marine engine is built strictly for marine use on GM production lines. The price includes intake manifold gaskets. The 5.7L L31 is the premier industrial workhorse, providing the power needed to get the job...marineenginedepot.com
