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Freaking Hell! Need BBC inboard help.

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Freaking Hell! Need BBC inboard help.

Old 07-07-2012, 04:37 PM
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Default Freaking Hell! Need BBC inboard help.

Soooo....had the family and the kids boyfriends/girlfriends aboard, and we decided we would go to Nantucket....so i thought

heres the deal. I bought a new to me boat with marine power 454s. So far this season, the run PERFECTLY..until today. No oil consumption, run at 170. tach up..yahta yahta.

We were running along in a swell doing 18-19 knots at 3200 rpm. Boat was fine. All of a sudden the better half yells up to the bridge the port motor was making a 'bad' sound. boy was it! Clacking sound. Shut her down, turn the boat around, limp home on starboard. Open up the engine hatch...check oil---clean as a whistle, full. Check coolant, fine. no leaks. no weird smells. But it sounds like something let loose internally.

20 minutes later, the STARBOARD engine just dies. Can rev it to start it, but no dice. Call tow boat Nantucket, tow us home. No big deal.

I had a half tank this morning, and put in 75 gallons of fresh (?) valvtech fuel with the kid this morning.

I have already burnt prolly 500 gallons this season roaring around and fishing. Seems odd now the fuel filters would clog.

Not concerned with starboard, i'll swap filters in the am (need to marinate some ice cubes NOW).

PORT clanking has me nervous.

What could it be? Can they (the marina) pull the top end in the boat (TONS of room in the engine room). Did I detonate the engine causing piston explosion due to lack of fuel? Knock sensor gone crazy?

The engines are carbed....

Any and all thoughts?;?:banghead :
Old 07-07-2012, 04:40 PM
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clacking sound.....rocker or bent pushrod

knocking sound ......rod bearing or wrist pin;?
Old 07-07-2012, 04:42 PM
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thats what im thinking too. how expensive is this gonna get?
Old 07-07-2012, 04:53 PM
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Check running gear and transmission. Gear noises can easily get transmitted to the engine. Do a compression check of the engine.
Old 07-07-2012, 04:54 PM
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Originally Posted by Tbrodes View Post
thats what im thinking too. how expensive is this gonna get?




sorry, can't help myself sometimes. I would have no real idea unless I heard it or looked at it. Whats the labor rate where you get service? Was oil pressure still up on the noisy one? was it a high tinny sound?no metal bits in the oil? take the filter off and pour it on a clean white sheet of paper and see if theres anything in it.
Old 07-07-2012, 05:32 PM
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90 an hour. Oil pressure was 40 psi. Clean looking on the stick, amber color just like before I left....

I'm curious how hard it is to pull valve covers. Did it on a tractor years ago. We're frly mechanical, but have never opened up n engine.
Old 07-07-2012, 05:35 PM
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It's def coming from the engine, but I'll check the drive train. It makes the god awful sound in neutral. Nervous to keep it running more than a few seconds
Old 07-07-2012, 05:36 PM
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Originally Posted by Tbrodes View Post
90 an hour. Oil pressure was 40 psi. Clean looking on the stick, amber color just like before I left....

I'm curious how hard it is to pull valve covers. Did it on a tractor years ago. We're frly mechanical, but have never opened up n engine.
pulling a valve cover on an engine is not hard. Especially on a carbed engine. the only thing that might be tough are the outside bolts next to the exhaust manifolds. a good 1/4" set with a u joint and short socket and some patience you can get it....worse comes to worse take a pic or two on your phone
Old 07-07-2012, 05:39 PM
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first..pull the plugs! If they've got aluminum on them your screwed. If they look good, do compression check.

Frankly, sounds like a bad fuel problem.
Old 07-07-2012, 05:43 PM
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Another great tip. Thanks guys. Keep em coming
Old 07-07-2012, 05:46 PM
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The noise could be a result of detonation a.k.a. engine knock.

Before you rip anything apart pull the filters, including the screens in the carbs. Empty the separating filters into a glass jar and see if you have separation of water and gas.
Old 07-07-2012, 05:57 PM
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Thinking about it, bet you got a load of diesel. Diesel has an octane rating of 25. Does the fuel smell funny?
Old 07-07-2012, 06:05 PM
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Stop running/ starting it up!
Old 07-07-2012, 06:20 PM
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I'm sure I was given the gas nozzle, albeit the place was a zoo. Fahk.
Old 07-07-2012, 06:29 PM
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Filters will be changed in the am. In the off chance I loaded diesel in my tank, what's the best way to deal with this?. But wouldn't it be odd to run 15 miles after fueling to then have them crap out?
Old 07-07-2012, 06:33 PM
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Originally Posted by Tbrodes View Post
I'm sure I was given the gas nozzle, albeit the place was a zoo. Fahk.
I think you would have noticed the diesel smell by now.
Old 07-07-2012, 06:34 PM
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Originally Posted by Tbrodes View Post
Filters will be changed in the am. In the off chance I loaded diesel in my tank, what's the best way to deal with this?. But wouldn't it be odd to run 15 miles after fueling to then have them crap out?

how much did you take on? how big are the tanks? cash or CC? check the reciept price per gallon
Old 07-07-2012, 06:40 PM
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They coulda put diesel in the fuel tank at the marina.
Old 07-07-2012, 06:50 PM
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Credit card. 65 gallons, math works out to be gas. Who knows tho. The girl was a bit dim and overwhelmed
Old 07-07-2012, 06:56 PM
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50/50 gas diesel mix from the marina pumped into your boat where it is further diluted. Stuff kinda stratifies when filling the tank, doesn't always mix real well. Same thing happens on boats with 2 strokes..oil and gas won't mix immediately in the tank. gotta put in small quantities of oil along with the fuel. Remember when you had to shake 6 gallon fuel tanks to mix the oil with the gas?

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