View Full Version : engine trouble

05-09-2011, 09:38 PM
Hello i am new to this site and looking for some advise. I recently purchased a 73 stars and stripes from a user on this site. I baught the boat knowing it had engine problems. The engine is taking on water from the cooling system, possible cracked block or cracked heads maybe. I had someone at work suggest that my exhaust manifolds could be causing this, has anyone had any experience with this or have advise on how to check. The engine is pulled and going to a mechanic withhin the week just woundering if exhaust manifold leak is a possibility for the large amount of water beeing forced into the engine. I have had experience with cracked heads in the past and I personaly believe this is the case but who knows. Another question.... the engine is a GM. could this be original and is there anyway to tell for sure? Id like to repair rather than replace if it is.


05-10-2011, 07:14 PM
I think you can take your manifolds to a radiator shop and have them pressure tested. By pressure testing the coolant passages they should be able to tell if they are ok or not.

Or have them magna-fluxed just like a block or heads.

05-10-2011, 11:01 PM
Curious to know what you mean when you say water is being forced into the engine, are you saying water is being forced into the cylinders causing the engine to hydrolock or are you seeing water in the oil???

How bout some pictures of your boat and welcome to Team Talk and congrats on your new boat

05-10-2011, 11:40 PM
What i mean by water is being forced into the engine is, the engine does run and seems to run ok. BUT.. water and oil mixture comes spraying out the valve cover vent tubes and the oil dipstick once the cooling system gets presurized. Im asuming not much is beeing forced into cylinders scince it was running and would continue to run fine. i knew this when i bought the boat and started it to diagnose myself. I am pretty sure i have a cracked head or block i just had the same problem on my truck last year and ended up beeing a cracked head. I will upload some pics soon. Any way to determine if this is the original engine?

Thanks alot

05-10-2011, 11:52 PM
These are just pics that the previous owner had. He is a member on the site. Well.. Was im not sure anymore.



05-11-2011, 09:55 AM
Should be a cracked exhaust manifold or a cracked block. I suppose a bad head gasket could cause this but it never works out that easy. Did this engine not get winterized properly?

05-11-2011, 10:07 AM
Welcome! Aside from the engine problems... Love the boat! I have an '83 and it came with a Ford 351 V8. Not sure about the '73. Good luck with her and post pics soon!!!!!!!!!!!!

05-11-2011, 10:41 AM
I believe that you use to be able to get a ford, Chrysler or oldsmobile in the 70's boats.

05-11-2011, 10:43 AM
I love the red interior. Reminds me of a 60's sports car.

05-11-2011, 10:43 AM
Do you have any pics of the engine?

05-11-2011, 11:26 AM
Could also have a Holman Moody built 302 Ford.

05-11-2011, 09:21 PM
Yea i have one i think. its not very good just a basic pic ill take some more soon. i have the engine pulled right now waiting on a friend to have a look at it. If the GM that i pulled isnt original than im not worried about it i can find a motor anywhere. Can anyone tell me the difference in an actual marine engine vs. a regular car or truck engine. I can find small block chevys and fords left and right but what components are different other than external. I mean internals .. Bearings and seals and .... Is there a difference? A few guys told me a regular car or truck motor will be fine but others tell me it wont last as long.
Anyone know?

05-11-2011, 09:26 PM
I ran the Block id number and Found its a GM 307 like the previous owner told me. I also found that the Id number was a 307 from the years 1969-1773 , my boat being a 73 makes me wounder....Anyway.. personaly im not concerned about originality of the motor i just want to ski!

05-11-2011, 10:44 PM

05-12-2011, 01:10 AM
A marine engine will have brass freeze plugs, a different profile cam, marine carb, starter, alternator, oil pan, intake manifold with no egr come to mind. I imagine I missed a few.

I haven't heard of a 307 as a stock engine in an early S & S, but certainly possible. Do you have any engine pics with the flame arrestor removed.

That engine makes me think of an early OMC inboard.

05-12-2011, 09:06 AM
Hopefully nothing is that wrong with the engine. Keep me posted.