Clicking/Fluttering Sound at WOT - Defender Source
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  #1  
Old February 28th, 2009, 01:15 PM
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Clicking/Fluttering Sound at WOT

Just some proactive troubleshooting here and/or possible paranoia

Recent 4.6 swap and at WOT or heavy acceleration I hear a clicking or metallic fluttering sound from the engine (not quite like lifter tapping, but similar). Hard to describe the sound, but I have heard it before in other cars... like when you are heading uphill in an automatic in too high a gear.

Truck runs fine at normal acceleration and no odd sounds are observed.

Any ideas? Normal?
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  #2  
Old February 28th, 2009, 02:15 PM
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Sounds like pinging.
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Old February 28th, 2009, 02:45 PM
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did you put a fuel chip in? My 4.6 did the same until I put a chip in and I haven't noticed it since
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Old February 28th, 2009, 07:12 PM
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Quote:
Originally Posted by btate
did you put a fuel chip in? My 4.6 did the same until I put a chip in and I haven't noticed it since
The shop that did the swap put in a chip, but who knows what kind or where they got the chip.

What are you drunning in yours?
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Old March 2nd, 2009, 06:00 PM
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Crankshaft counterweight hitting the oil pan....? If you put the steel 3.9 oil pan on a 4.6 it requires clearancing at the front or the counterweight will just touch the inside of the front of the pan. Clearancing is accomplished with a torch to heat the pan and a bit of hammering to move the metal about 3mm. If this is the problem you will probably be able to feel it by holding your hand against the shallow part of the oil pan when it is running. It will leave a shiny mark so you know where to give it clearance.
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Old March 2nd, 2009, 10:28 PM
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Quote:
Originally Posted by Roadsiderob
Crankshaft counterweight hitting the oil pan....? If you put the steel 3.9 oil pan on a 4.6 it requires clearancing at the front or the counterweight will just touch the inside of the front of the pan. Clearancing is accomplished with a torch to heat the pan and a bit of hammering to move the metal about 3mm. If this is the problem you will probably be able to feel it by holding your hand against the shallow part of the oil pan when it is running. It will leave a shiny mark so you know where to give it clearance.
It was a 4.0 --> 4.6 swap (same oil pan?)
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Old March 3rd, 2009, 11:08 AM
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Quote:
Originally Posted by fleabus
It was a 4.0 --> 4.6 swap (same oil pan?)
Yeah, the 3.9 and the 4.0 use the same oil pan. The crank counterweights are bigger on the 4.6L crank and all of the swaps I've done required clearancing the pan.
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Old March 3rd, 2009, 11:12 AM
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Quote:
Originally Posted by Roadsiderob
Yeah, the 3.9 and the 4.0 use the same oil pan. The crank counterweights are bigger on the 4.6L crank and all of the swaps I've done required clearancing the pan.
Interesting... what you describe sounds like how I imagine the sound originating (at least in my mind)... almost like pinging, but a slightly more metallic noise under heavy acceleration. If this is the casse, any reason why I wouldn't hear the sound under normal operation?
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  #9  
Old March 3rd, 2009, 11:29 AM
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As rigid and tight as an engine is, things still move and flex a few thousandths of an inch under different loads. It may take WOT or heavy acceleration to flex things enough to get contact. It could still be pinging....but I know for a fact that all of the 4.6L swaps I've done required clearancing the pan....and I figured it out after I had what sounded like a bottom end tapping noise on the first one.
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Old March 3rd, 2009, 11:36 AM
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Got it... thanks for the advice.

I'll check it out this weekend and report back.
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