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Old 06-14-2005, 00:11   #1 (permalink)
BRONCO BIFF
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81 bronco 351 timing adjust w aftermarket pulley?balancer

I was doing about 70 on the freeway when my bronco decided to quit.
>From previous discusions it looks like it jumped timing. With 12k on

odometer
(assuming 112 ) it(the engine) just stopped as if someone had turned it
off. Can the timing be adjusted just to get it home? What usually
jumps? The distributor or the cam? This engine looks like it has an
aftermarket
pulley/ balancer and I don't see any numbers,marks on pulley or
balancer
nor a marker on the engine. How do I adjust?? The cap and rotor are
weird and the distributor was throwing out some oil just before this.
Can I get away with just a new chain or should I change the gears too??
It does have a spark,and no alves are hitting,when the starter cranks,
but it cranks fairly fast. Can anybody with the same experince help me
along Thanks.

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Old 06-14-2005, 00:11   #2 (permalink)
lugnut
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Re: 81 bronco 351 timing adjust w aftermarket pulley?balancer

On 12 Jun 2005 18:14:54 -0700, "BRONCO BIFF"
<merz_300@yahoo.com> wrote:

>I was doing about 70 on the freeway when my bronco decided to quit.
>>From previous discusions it looks like it jumped timing. With 12k on

>odometer
>(assuming 112 ) it(the engine) just stopped as if someone had turned it
>off. Can the timing be adjusted just to get it home? What usually
>jumps? The distributor or the cam? This engine looks like it has an
>aftermarket
>pulley/ balancer and I don't see any numbers,marks on pulley or
>balancer
>nor a marker on the engine. How do I adjust?? The cap and rotor are
>weird and the distributor was throwing out some oil just before this.
>Can I get away with just a new chain or should I change the gears too??
>It does have a spark,and no alves are hitting,when the starter cranks,
>but it cranks fairly fast. Can anybody with the same experince help me
>along Thanks.




If the timing chain has jumped so that it quit while going
down the road, it is not going to run until repairs are
made. Also, it is not usually possible to tell what kind of
valve damage you may have w/o doing a compression test as
the lifter will partially collapse allowing some clearance
even though a valve may be bent. An engine that has jumped
will have uniform low compression. There is no amount of
adjusting the ignition timing to make it run if the timing
chain is jumped. If you have not already screwed around
with the timing, you can check timing with a light while
someone cranks the engine for you. If the ignition timing
is not off more than 5 deg or so, the timing chain may not
be your problem unless you make it so.

Good luck
Lugnut
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Old 06-14-2005, 23:01   #3 (permalink)
BRONCO BIFF
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Re: 81 bronco 351 timing adjust w aftermarket pulley?balancer

Thanks for your input!!! I am ready to do what it takes, be it changing
gears and timing chain. How do I know what damage was done to valves
and lifters? My biggest problem is the timing with this aftermarket
pulley/balancer that doesn't have any markings or numbers on it. How do
I set the timing?? Thanks much

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Old 06-15-2005, 03:01   #4 (permalink)
lugnut
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Re: 81 bronco 351 timing adjust w aftermarket pulley?balancer

On 14 Jun 2005 22:01:28 -0700, "BRONCO BIFF"
<merz_300@yahoo.com> wrote:

>Thanks for your input!!! I am ready to do what it takes, be it changing
>gears and timing chain. How do I know what damage was done to valves
>and lifters? My biggest problem is the timing with this aftermarket
>pulley/balancer that doesn't have any markings or numbers on it. How do
>I set the timing?? Thanks much



First, the timing scale was not on the damper on those IIRC.
It is on the pointer plate. You can probably clean the
grease off to see it. Next, I don't think you have done
nearly enough diagnostic to condemn the timing chain yet.
Failure of those at 112K miles was not common. The first
things you need to determine is whether you have proper fuel
and a properly timed spark going to it. W/O those, you can
rebuilf the whole engine with no results other than further
damage to your wallet. Contaminated fuel or a plugged
filter can easily shut 'er down. The first thing you are
going to need is the best service manual you can find for it
and spend some time familiarizing yourself with what you
have. Auto repair can be very damaging to your ego and
wallet if you have no idea WTH you are doing.

Good luck
Lugnut
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