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Author Topic: piston ring  (Read 1293 times)
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antman
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« on: June 10, 2020, 12:24:56 PM »

could a piston ring break and fall out of the exhuast port
found a piece on the floor ?
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antman
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« Reply #1 on: June 10, 2020, 01:04:48 PM »

its 60 mm long
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MERCMAN
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« Reply #2 on: June 11, 2020, 07:46:10 AM »

I would be totally amazed if that's what actually occurred! I suggest you pull the transfer port covers off and check.
It's not one of your mates playing a joke on you, is it?
Maybe refrain from conducting a compression test, just in case you create more damage.

When I was about 15 years old, I took an inlet valve from a four stroke mower to school. When my science teacher arrived at school in his car, I bent over in front of his car and pretended to pick up something from the ground. After the teacher got out of the car, I showed him the valve and I told him it just dropped out his Fiat, as he pulled up. He was most distressed and took his car to a local mechanic at lunchtime. I never found out what the mechanic told him. hehe.

MERCMAN.
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senojn
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« Reply #3 on: June 11, 2020, 07:29:41 PM »

The mechanic said ''it's that lad in year 9 - G.M.  a very naughty boy ".
The teacher replied they are all naughty boys but G.M is the Messiah !
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antman
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« Reply #4 on: June 12, 2020, 02:42:48 PM »

ring bit


* IMG_20200607_180542815.jpg (559.86 KB, 1560x2080 - viewed 17 times.)
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antman
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« Reply #5 on: June 12, 2020, 02:46:35 PM »

 did remove before a suggested in previous reply
all 4 pistons have three rings  they are springy when pushed
may need a camera up the exhaust  to look
 and my mates arnt that switched on to pull off a wicked trick like that
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antman
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« Reply #6 on: June 12, 2020, 02:58:30 PM »

piston no 4


* IMG_20200612_145109539.jpg (181.22 KB, 600x800 - viewed 19 times.)
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MERCMAN
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« Reply #7 on: June 12, 2020, 07:59:19 PM »

Sadly,a camera won't really view the bores via the exhaust stack.. the final 90 degree bend will prevent it.. I believe!
Try spying in plug holes with a bright LED torch (or camera) to inspect bores for scoring. (number 4 will be difficult. if the block is still on mid section, use a small mirror). Remove all plugs and slowly rotate flywheel by hand, whilst spying.
If all rings in all pots are "springy"as you say, all seems to be OK by me and the likely hood of further/any damage is therefore somewhat minimal.
When you are about to conduct compression comparison, make sure of the following:

Replace transfer port covers.
Make sure throttle is wide open, prior cranking.
Crank motor with the ignition in the "off" position. If you don't know how, simply ask me!
Record individual pot readings. 10 - 15% variant is usually acceptable. Remember, all gauges will reveal different readings, it's the variant (no Neil, not Valiant.  Smiley) you are looking for!

MERCMAN.

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