detecting which pistion ring is cracked

Mark Walker · Dec 15, 2013

i have a Ford 5000 and I suspect a cracked ring as the engine is missing and blowing back through the dipstick. How do I detect which cylinder is the problem?

Mike Groom · Dec 15, 2013

All you need to do is a compression test and see which cylinder is low.

old · Dec 15, 2013

Very simple. Pull one plug at a time. When it stops then you know which cylinder is causing the blow back. No compression as in plug out no blow back

Ultradog MN · Dec 15, 2013

You are assuming it is a gasser.
But there were a lot more diesels in that model than gassers. Mike Groom has the better answer as it applies to both.

old · Dec 15, 2013

Ah but with a diesel it is a heck of a lot harder to check compression also and takes a special heavier built gauge to do so. Plus since he did not say we can only take guesses

Bern · Dec 15, 2013

Why bother trying to figure out which cylinder it is? Pull the head, drop the pan, yank ALL the pistons, and re-ring them all.

If it's a diesel, and you really must know quickly, cut the fuel to one cylinder at a time by loosening injector lines at the injectors. The weak cylinder will be the one that has the least affect on engine speed when the line is cracked.

Mark Walker · Dec 16, 2013

hey guys thanks for the help. I don't have a compression tester and I am out on a farm in OUdtshoorn, South Africa so think maybe the removing of the fuel line will work. so thanks a stack

sunbeam · Dec 17, 2013

Kill each cylinder either plug wire or injector line. A dead cylinder will produce less pressure. If it's missing already that would be the one.

detecting which pistion ring is cracked

Mark Walker

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Mike Groom

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old

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Ultradog MN

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old

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Bern

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Mark Walker

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sunbeam

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