Threw a rod? Salem OR Mech? - Vintage Mustang Forums
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post #1 of 13 (permalink) Old 08-09-2019, 02:54 PM Thread Starter
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Threw a rod? Salem OR Mech?

Took car out to pick up groceries, car ran beautifully prior to turning off the engine. Upon starting the engine 10 mins later, it started right up but it ran very rough, backfiring through carb when accelerating, clacking away (did not clack before). I was able to nurse it home yet never over 35 mph.

So, what happened? Rod, valves stuck, timing belt.. suggestions?

I now live in Salem Oregon and am unfamiliar with mechanics in the area, so for Bonus points, suggestions as to mech in Salem?

Thanks in advance,
Jerry


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post #2 of 13 (permalink) Old 08-09-2019, 02:59 PM
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Sounds like timing to me(not that listing a few symptoms means much on the internet)...distributor hold down come loose maybe?
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post #3 of 13 (permalink) Old 08-09-2019, 03:15 PM
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Collapsed lifter?
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post #4 of 13 (permalink) Old 08-09-2019, 03:19 PM Thread Starter
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Yeah, Wicked, was thinking that as well, I checked and the Dizzy is still locked down tight. Collapsed lifter? Could be. Thanks for the suggestions.

BTW, I spoke with the folks at WCCC (West Coast Classic Cougar) and received recommendations for a mech as well as a Machine Shop. Thanks WCCC


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Last edited by 67 Fastbacker; 08-09-2019 at 03:23 PM.
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post #5 of 13 (permalink) Old 08-09-2019, 03:29 PM
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broken rocker arm?
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post #6 of 13 (permalink) Old 08-09-2019, 03:30 PM
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Timing chain skipped. That will cause the timing to retard substantially which will cause backfiring
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post #7 of 13 (permalink) Old 08-09-2019, 03:46 PM Thread Starter
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Thanks to WCCC (I have used several of their parts over the years) I have an appointment Monday with a mechanic who actually knows 289's and gave all the right answers to my questions.

I'll post once the results are in as to exactly what the issue is/was.

So far the guesses include:
- distributor hold down come loose maybe?
- Collapsed lifter?
- broken rocker arm?
- Timing chain skipped.


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post #8 of 13 (permalink) Old 08-09-2019, 04:50 PM
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Many of the old timing chains sets had a cam gear with nylon teeth.
Those frequently fail over time.
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post #9 of 13 (permalink) Old 08-09-2019, 04:58 PM
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My first thought was timing chain
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post #10 of 13 (permalink) Old 08-10-2019, 09:38 AM
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Originally Posted by Jsams View Post
Many of the old timing chains sets had a cam gear with nylon teeth.
Those frequently fail over time.
Which break off and the fragments end up in the il pan, then get sucked into the pump, which locks it up and snaps the tiny 289/302 oil pump driveshaft. Result is very similar to what the OP is describing, since there's no oil pressure.

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post #11 of 13 (permalink) Old 08-14-2019, 02:44 PM Thread Starter
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Update

Bent Rod on #2 cylinder, they are currently tearing it down to seek cause and to see if crank is damaged.



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post #12 of 13 (permalink) Old 08-14-2019, 02:51 PM
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Originally Posted by 67 Fastbacker View Post
Bent Rod on #2 cylinder, they are currently tearing it down to seek cause and to see if crank is damaged.

bent push rod ,looking at pic possible cause = carbon build up. Also does the engine have guide plates for the pushrods or slotted holes in the heads the pushrod looks very worn in one spot


Brad

Last edited by 2nd 66; 08-14-2019 at 02:53 PM.
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post #13 of 13 (permalink) Old 08-14-2019, 05:10 PM
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Looks like they weren't chromoly pushrods and they were running guideplates.
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