[Shotimes] Engine noise identified

[Donald Mallinson]

Re-read, you meant the small chains at the back of the 
motor, on the front and back heads....I thought you were 
talking about the front and back of the engine (passenger 
and drivers ends!).

The slight noise from the tensioners is usually associated 
with low pressure at that point, since the tensioners are 
oil fed (with a spring back up).  Quite often, a new chain 
and tensioner will NOT solve the noise.

Still, curious where you found a brand new engine.

Don

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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