flow chart for diagnostic

what is standard flow chart call for diagnostic for 1992 Ford Escort broken timing belt? or rather most logical way to diagnose whether it has bent valve or rod? Without knowing it is whether interference engine or not. Some people says it is , some says it is not. After checking with ALLDATA and still not able to get conclusive answer. What is most logical step: A: Technician A says tear down engine to inspect valve and rod, because all engines will have bend valve and rod when timing belt broke. B: Technician B says: do a leak down test by taking off cam cover first. C: Technician C says: do a leak down test by rotating cam 45 degree increment slowly and feeling it, and at same time have another person rotate flywheel half of 45 degree increment and feeling for resistance. D. Technician D says: do a leak down test by rotating cam half of 45 degree increment slowly and feeling it, and at same time have another person rotate flywheel 45 degree increment and feeling for resistance. E. Tell customer time to trade for another car using "CASH for Clunker" even car is not qualify.

**or just add your comment.
Reply to
Philip5malin
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Two engines are shown as possibles for that Escort, in the USA at least.

4-116, 1.9 litre, Vin J SOHC, or 4-109, 1.8 litre, Vin 8 DOHC

Is one of these the engine you have?

Reply to
hls

Sorry, I wasnt quite finished.. I show neither of these to be an interference engine. The 1.6 litre Escort engine is interference, but was not shown for your car.

Maybe this link will help...

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Reply to
hls

so it does not matter. It is

4-109, 1.8 litre, Vin 8 DOHC . In addition: E. Technician E says, what the heck, it is broken belt, so put back a new belt, and do compression test. F. Technician F says: do boroscope test first, by using a snake microscope into spark park hole, can give preliminary condition of valves and some indication of rods. *********************************

own as possibles for that Escort, in the USA at least.

Reply to
Philip5malin

so it does not matter. It is

4-109, 1.8 litre, Vin 8 DOHC . In addition: E. Technician E says, what the heck, it is broken belt, so put back a new belt, and do compression test. F. Technician F says: do boroscope test first, by using a snake microscope into spark park hole, can give preliminary condition of valves and some indication of rods. ********************************* If it isnt an interference engine (and apparently it is not), put a new belt on it. If you feel better doing a cylinder compression test before you start it up, great. And using a fibre optic boroscope, you could certainly look inside and see if there are any badly bent or broken valves.

Or just start it up and see how it runs.

Generally when you break a belt with a noninterference engine, nothing happens inside. You just replace the belt and motor on off. Now, if you had dropped a valve, or had broken a valve into the engine, that would be a different matter. The piston could have come up to the top and rammed into the debris, possibly breaking a belt, certainly causing havoc in that cylinder. (I think this is unlikely, but not impossible.)

How long had you run that belt? They are recommended to be changed at 60,000 mile intervals. If you were away over that interval, maybe the sucker just broke.

Reply to
hls

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Reply to
Paul Hovnanian P.E.

Reply to
Philip5malin

what if the car is a 1992 Honda civic with interference engine. Will you answer changed? to A: take apart engine B: do a leak down test first , with 45 degree increment on cam C do a leak down with 45 degree increment on flywheel D. put belt on, do compression test E. do boroscope fiber optic inspection first.

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Reply to
Philip5malin

If I had access to a borescope, I would use that first. It is quick and can give you an overall view of what has happened very simply.

And pulling the engine apart is the last thing you do.

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Reply to
hls

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