[Shotimes] Engine noise identified

[Donald Mallinson]

Leigh,

What engine is this?  The V6 does not have a cam chain, it 
has a cam belt, at least the main one in front, two smaller 
chains with oil fed tensioners in the back).  Is this what 
you meant?

Where did you find a factory fresh 3.2?

Don Mallinson

Leigh Smith wrote:
> As some of you know I installing a brand new Factory fresh SHO crate motor in
> my 100k mile '94 MTX
> due to engine noises.
> 
> In comparing the brand new Ford motor to my old one, I have found 2 things so
> far:
> 
> I had a soft knocking noise which sounded like rod knock.
> It did seem to be in the front valve cover near the coil pack.
> It turned out the front cam chain was stretched, overpowering the tensioner.
> It had 3/4 inch slop (+ or -) between the sprockets
> That is the absolute limit of travel on the chain tensioner, which looked
> almost new.
> The rear chain had less slop, + / - 1/2 in slop,  so the adjuster could still
> function.
> but the chains in the factory fresh engine only have 1/4 inch slop, and have
> 13mm of adjuster movement available to tighten chains in the future.
> Note that the trensioners are not available anymore, but the chain seems to be
> the part that wears, and they are still available.
> 
> Second issue was bearing clearances.
> My old motor had 4.0 thousanths clearance on the rods, out of spec, and was
> not trusted to drive daily.
> The bearings were very worn (much copper) but new rod bearings did not help
> the clearance.
> The new Ford motor spec'd out at 2.0 exactly on the mains and the rods.
> I am assuming the old crank is worn, but will know more shortly.
> 
> Lee
> (Inquiring minds want to know...)
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