Bought OMC 3.0 with outdrive off

[headstartnana@aol.com]

The guy said it was knocking and took it "somewhere" and they pulled the outdrive off. Said that it was a rod knocking. <br />Need opinion here....should I reinstall outdrive and diagnose from that point (saw a posting where the guy had a "knock sound" and it wasn't the rods/mains.<br />Do I have to reinstall outdrive to diagnose? water issues and seals...etc.<br />Thanks for any/all help

 

[cobra 3.0]

Re: Bought OMC 3.0 with outdrive off

Which year OMC?<br /><br />You need to insert your garden hose into the water inlet from the outside where the drive was attached. You should not run the engine without water for cooling.

 

[THE BEEF]

Re: Bought OMC 3.0 with outdrive off

Hello MEB<br />Welcome to iboats.<br />Ok, I have an idea. If you want to run the engine to check for a problem I believe there is a feed water hose that comes from the intermediate housing if it's a stringer. you should be able to hook a garden hose to it and run the engine with out the drive on.<br />Beef

 

[Don S]

Re: Bought OMC 3.0 with outdrive off

Just start it up with the drive off. You won't need water for a few seconds of running to hear a rod knocking. And you can't damage the impeller cause it's in the drive. IF you want to run it more than that and need cooling water just hook a water hose to the engines water intake hose that attaches to the transom shield.<br /><br />The reason for them pulling the drive is to eliminate ujoints, or the drive as the cause of the noise.

 

[headstartnana@aol.com]

Re: Bought OMC 3.0 with outdrive off

Thanks guys! I was concerned about doing any additional damage to the engine. The previous owner told me they removed the outdrive in order to pull the engine. I know cars but not boats. I knew that I could run it long enough to hear a rod knock without water but I wanted to be flexible in case I didn't hear a knock. I keep seeing in the forum where the exhaust flapper can make a similar noise. Thanks again for the help!<br />I'm sure I'll be back.

 

[headstartnana@aol.com]

Re: Bought OMC 3.0 with outdrive off

I forgot to add 87 140hp 3.0L

 

[headstartnana@aol.com]

Re: Bought OMC 3.0 with outdrive off

Went to crank over the engine and started to try turn it by hand and it is stuck. Will let you know when I can get it to turn over

 

[jch7450]

Re: Bought OMC 3.0 with outdrive off

Gotta be carefull checking a knock in a 3.0. I had one, It run great with the muffs (No load)<br />Put in the water , went out about 1/4 mile and it sounded like it was going blow a rod out the side. The dealer said ( OH (*^%)&)(7@$) lol

 

[cobra 3.0]

Re: Bought OMC 3.0 with outdrive off

You tried to turn it clockwise ...right?<br /><br />Any how, looks like it's time to pull the head off and inspect.

 

[lilmandavis]

Re: Bought OMC 3.0 with outdrive off

what color is the oil

 

[headstartnana@aol.com]

Re: Bought OMC 3.0 with outdrive off

The oil is clear. <br />They left the s/plugs out so the pistons were stuck. Couldn't turn it either way.<br />Since the last posting, I've done a complete tear down. As far as the "knock", four of the coupler bolts were finger tight. The other 2 were barely tight. But to be sure, tore it down the rest of the way. Rods and mains are perfect. Wrist pins are good. No broken pistons/rings. BUT did find headgasket blown between 2 & 3. And what has me most worried..... the block has a crack above the port side front freeze plug. The previous owner said that he had ran it with problem before.<br />The engine is .030 over and the rods/mains are std.<br />I'm wanting to know if an automotive 2.5L will bolt up.<br />Thanks