Re: IML: Timing Chain

[RandalPark@xxxxxxx]

A simple test is to remove the distributor cap, and watch the rotor while you crank the engine. Delayed movement is a sign of loosness.

Paul

In an email dated Fri, 4 3 2005 5:41:30 pm GMT, "Eric" <gearhead@xxxxxxxxxxx> writes:

>Kle,
>The nylon coated cam sprocket progressively degrades until at one point 
>there isn't enough material on it to hold the chain tight enough and then 
>the chain will slip. I think the chain rarely fails due to breaking a link, 
>though the chain will stretch some.
>With a timing light, you can pretty well tell the condition of the timing 
>set by looking for any skip in the timing mark. I experienced a surging at 
>high speeds that was constant and rhythmic until the new chain set was 
>installed. With the worn set, I would have to jab the throttle to the floor 
>to get it off of high idle when cold, I believe that was a symptom of low 
>vacuum based on the cam being out of time with the crank, causing not enough 
>of an air rush through the carburetor air horn to open up the choke plate.
>Someone mentioned that the chain set will fail at start up, usually. While 
>this may be, mine failed on an exit ramp just as I fully lifted my foot off 
>the gas pedal, creating an engine braking force. The motor died, then 
>cranked irregularly. I could see the rotor skip when I cranked the motor 
>after I finally got the car home.
>In answer, the chain assembly will fully fail at once, but with plenty of 
>clues that its about to go. The 440 is a non-interference motor.
>
>Eric
>Portland, Oregon
>______________________________________________________
>From: "Klebert L. Hall" <swampyankee@xxxxxxx>
>Subject: Re: IML: Timing chain
>Date: Fri, 4 Mar 2005 07:43:05 -0500
>Reply-To: mailing-list@xxxxxxxxxxxxxxxx
>>From: "Robin Giesbrecht" <robings@xxxxxxxxxxx>
>>Subject: IML: main bearings, oil pressure gauge
>>
>>Next is the cam and timing chain.Looking at that timing chain(slack) from
>>the crankcase while doing the bearings made me shudder.
>
> ? Correct me if I'm wrong, but when the timing chain goes in these cars,
>don't they just stop? That's always been my experience with old pushrod
>cars... The 440 isn't a valve-interference engine, is it?
> ? ?-Kle.
> ? ?'69 Crown 4DHT
>
>
>
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