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I HAVE 2 1997 454lx'S WITH THROTTLE BODY IN MY BOAT. ONE…

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I HAVE 2 1997...

I HAVE 2 1997 454lx'S WITH THROTTLE BODY IN MY BOAT. ONE ENGINE HAS A LOUD BANGING NOISE (LIKE A PIECE OF LIGHT METAL) IN IT. HAVE CHECKED COMPRESSION, TIMING, ECM, CHANGED DISTRIBUTOR CAP COMPLETE ELECTRONIC DIAGNOSTIC TEST - AT A LOSS TO FIGURE OUT WHERE TO LOOK NEXT???? ANY IDEAS?

Mechanic's Assistant: Sometimes boat issues seem like they'll be really complicated, but end up being easy to fix. The Marine Mechanic I'm going to connect you with knows all the tricks and shortcuts. Is there anything else important you think the Marine Mechanic should know?

CHRIS

Submitted: 3 months ago.Category: Boat
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Answered in 3 minutes by:
3/29/2018
Marine Mechanic: Jason, Marine Mechanic replied 3 months ago
Jason
Jason, Marine Mechanic
Category: Boat
Satisfied Customers: 17,909
Experience: Degree in Marine Technology. Gas and diesel marine mechanic.
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Hi Chris, my name is***** it make this banging noise in neutral, in gear, or both? Is the noise rhythmic, or random?

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Customer reply replied 3 months ago
Hi Jason:
Both in neutral and in gear. It seems more random, but steadily random - quite loud, almost sounds like a piece of metal or tin being bounced around internally. Couldn't isolate it witha stothoscope, but almost seems to be at the throttle body?? Normally the engine would start and run on all 8 cylinders immediately but with the sound it seems to delay getting all 8 underway.Chris
Marine Mechanic: Jason, Marine Mechanic replied 3 months ago

H​I Chris. Is the engine pinging? Are you familiar with what a pinging engine sounds like?

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Customer reply replied 3 months ago
No ping, and yes I know the sound. Best way to describe the noise is "like a piece of tin plate getting bounced round in the engine. Did a compression check and all cylinders are fine. Changed plus, wires.
Marine Mechanic: Jason, Marine Mechanic replied 3 months ago

B​y chance did you happen to use your stethoscope on the back of the engine, where the bellhousing is?

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Customer reply replied 3 months ago
I thought about that - can clutch plates that are noisy transfer the sound so much that they sound unrelated to the tranny? I had a semi-noisy cliutch plate issue last summer. Put in an ounce of a "transmission goop" (sorry can't remember the name) last summer that quietened it to an acceptable "low rattle" - amplify the same sort of sound and that's what I'm hearing, but seems to be out of the motor??
Chris
Marine Mechanic: Jason, Marine Mechanic replied 3 months ago

Y​es, the clutch plates can become noisy. But a lot of times what it actually ends up being is a loose flywheel. Unfortunately loose flywheels can and do happen.

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Customer reply replied 3 months ago
Jason. If it helps - like most I'm a fair weather boater. So, I start the engines every 2 or 3 weeks and run them to operating temperature. The noises just started this week. I generally put the transmissions into forward and reverse to remove stuff from the props - no untowards noise until now.
Does this help at all.
Marine Mechanic: Jason, Marine Mechanic replied 3 months ago

N​o, not really. I am just not there to see it. Can you take a video with sound and upload it to youtube? At least that way I can listen to it.

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Customer reply replied 3 months ago
Can do, but, I'm not at the boat again until Saturday. How can I get back direct to you at that time? Or do you work Saturdays?
Chris
Marine Mechanic: Jason, Marine Mechanic replied 3 months ago

I​'m always on and off. All you would do is reply right back to this chat session just like you have been.

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Marine Mechanic: Jason, Marine Mechanic replied 3 months ago

H​ello. Just checking in. I never heard back from you. How did you make out?

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