Re: IML: 73 440

[Tim Durrer <tdkd99@xxxxxxxxx>]

Thanks guys, I just didn't want to do damage to the
engine between now and when my Dad helps me with the
project.

Tim

--- randalpark@xxxxxxx wrote:

> This is exactly correct and is the experience that I
> have also had with 
> timing set failure.
> 
> Paul W.
> 
> -----Original Message-----
> From: peter.engel@xxxxxxxxxxx
> To: mailing-list@xxxxxxxxxxxxxxxx
> Sent: Mon, 12 Feb 2007 7:18 PM
> Subject: Re: IML: 73 440
> 
> Tim,
> 
> The B/RB engines are most definitely
> NON-interference engines. A chain 
> can
> break or a sprocket strip while you're cruising down
> the highway and the
> engine will simply stop without damaging the valves
> or piston tops.
> 
> That's almost never how the failure happens though.
> Stress on the 
> camshaft
> sprocket teeth (they are what fail) is highest
> during engine starting. 
> So
> what happens is that while you're driving, the last
> bits of nylon teeth
> break off the aluminum sprocket but the chain is
> held outward by 
> centrifugal
> force and continues to drive the cam. Then, when you
> shut the engine 
> off,
> the chain sags and hangs loose around the crankshaft
> sprocket. When you 
> try
> to restart there's not enough "bite" between the
> crankshaft sprocket 
> and the
> chain so the crank spins but the cam stays put.
> 
> You should be replacing the timing set at 100k miles
> anyway since that 
> is
> about the time that the nylon will start to break
> off the cam sprocket.
> Once the nylon starts to break off the shedding
> process accelerate 
> rapidly.
> 
> I've replaced a bunch of timing sets due to the "it
> ran fine when I 
> shut it
> off but now it won't start and it cranks funny"
> phone call.
> 
> Here's a sprocket from a 69 or 70 Charger 440. 110k
> miles. Replaced the
> timing set and off the owner went.
> 
> http://bos-engel.com/imperial/sprocket.JPG
> 
> Here's a shot of timing chain slack on my 66 New
> Yorker. 97k miles and I
> replaced it before it left me sit.
> 
> http://bos-engel.com/MML/slack.jpg
> 
> Pete in PA
> 
> Date: Mon, 12 Feb 2007 07:40:25 -0800 (PST)
> From: Tim Durrer <tdkd99@xxxxxxxxx>
> Subject: IML: 73 440
> Reply-To: mailing-list@xxxxxxxxxxxxxxxx
> Does anyone know for certain if a 73 440 is an
> interference engine or not?
> 
> I still debating on a timing chain and gear
> replacement on my 73 with 101,000 miles. I recall
> the
> small block Chrysler engines would basically self
> destruct if the cam sprocket stripped.
> 
> Tim Durrer
> 73 LeBaron Blue Sky
> 
> 
> 
> 
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