I am new to the forum but have been browsing for quite a while.
I would like to introduce myself, my name is Damien. I am 25 and a marine engineer based in Wales, UK.
Last year a customer came to us with his boat. A 1990 Rinker, fitted with a 4.3 LX V6 Mercruiser.
The customer had just bought the boat (without hearing it running) and when he got it home, he disconnected his trailer without chocking it and the boat roller into farming equipment, writing off the stern drive. I replaced the stern drive and transom shield with brand new units. Upon starting the engine I noticed a horrendous knocking from the bottom end. Instantly I phoned the customer and suggested a strip down/possible rebuild. Being as tight as he is, he decided to take the engine elsewhere to be rebuilt, whilst I agreed to re-install it once it had been done.
A year later, the engine comes back to us.
I installed the engine and tried to start it up, only to find out the timing was out and all of the plug leads had been put in the wrong place. I set the base timing, put all of the leads where they should be and still then engine refuses to start/is hard to start.
Now the engine will start briefly, it will pump out masses of white smoke and eventually stall.
I have tried everything and am out of ideas. I am hoping you guys can help me out as I may have overlooked something.
WHAT I HAVE DONE;
Checked compression on all cylinders, figures returned 150PSI on all.
Bypassed fuel tank and pre-engine filter by hooking up my own supply.
Installed brand new spark plugs.
Set base timing and checked correct firing order.
Fuel is being sprayed out of carb when throttle is pumped.
Brand new starter motor.
Brand new battery.
New oil filter & engine oil.
As said, i have tried everything I can think of. Any help would be greatly appreciated.
And dont be afraid of suggesting even the most basic things, I never get offended