Re: Mooing Rambler - BACKFIRING - timing chain wear check...

[Jerry Casper <gremlingts@xxxxxxxxx>]

--- Brian Hagen <brian.hagen@xxxxxxxxxxx> wrote:

> I forgot to mention.. its backfiring thru the
> exhaust, not out the carb.
> 


 Brian, have you checked the timing chain for wear?
THis usually caused backfiring, too, if it's worn
alot. To static check it, you'll need 2 people, one to
look at the distributor rotor, the other to turn the
crankshaft by breaker bar/socket. Here's how it goes :

 Bump the motor over til it's anywhere near the center
of the timing mark tab. You need to know which way the
pulley was turning, so you can turn it OPPOSITE with
the breaker bar. 
  Make a pointer to line up with the distributor rotor
tip. Have your assistant watch the rotor. Now, make a
note of which timing mark the balancer was at. Once
you have that written down, take the breaker bar and
back up the engine with the bolt, trans in neutral,
until your assistant hollers that the distributor
rotor has just moved. Won't take much movement if the
chain isn't worn! Will move some if it IS worn alot.
Now, compare the current timing mark line-up with the
previous one. If it's over 4 degrees off, then the
chain is worn out. That can cause your backfiring at
idle. Another way is to see how steady your timing
mark is staying at idle, if it seems to jump alot,
it's worn. If it's rock-steady, it should be ok,
depending on RPMs. 
  Good luck, at least it's now running!

Jerry


		
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