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New Rings As A Routine Engine Rebuild Thing?


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#1 NDT

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Posted 24 June 2020 - 02:45 PM

I'm rebuilding my old Metro turbo engine.

I've never run it.

Cylinders look good - can still see the hone marks and there's no wear lip.

Would anyone replace the rings as a precaution or are they likely to be ok?



#2 wile e coyote

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Posted 24 June 2020 - 03:58 PM

i replace but that assumes the availability of good quality replacements  - the only exception was the rebuild of my 1301 - due to lack of availability of +30 rings......a good clean degum and refit worked out fine and is still rolling around happily in a friends car 50k later....

 

Honing marks do last for a very long time and shouldn't be taken as a guide to condition ....As you've never run it and the cost of new rings is not excessive  it'd perhaps be prudent to renew ...worn rings becoming evident when back together would smokily and MOT failingly lead to a fair few expletives......



#3 Moke Spider

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Posted 24 June 2020 - 07:14 PM

If you have it stripped, then check the piston to bore clearance if there's no discernible wear. If that's in spec, then have the bores lightly honed to bust any glaze they may have and fit new Iron Rings.



#4 cal844

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Posted 24 June 2020 - 08:18 PM

Measure it all first, then if it's in spec just hone it again to get rid of the glaze.

#5 Avtovaz

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Posted 24 June 2020 - 08:28 PM

how do you measure the bores with the piston? Im in the same boat with my 998, i was going to buy some standard size rings and measure the gap.



#6 cal844

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Posted 24 June 2020 - 08:42 PM

Take it to a machine shop

#7 Avtovaz

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Posted 24 June 2020 - 08:58 PM

there is that, but the places i usually go want big money to do anything now, ive been asking about already. Is because of the covid stuff i think.

 

 

But i think if i put a known standard set of rings in it and measure the gap, i should be ok if the gap is ok? But dosnt account for any non round bore wear.



#8 Moke Spider

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Posted 24 June 2020 - 11:30 PM

how do you measure the bores with the piston? Im in the same boat with my 998, i was going to buy some standard size rings and measure the gap.

 

One way is to do it with a feeler gauge, but be sure you are measuring the clearance and not pushing the piston out of shape.  I say measuring, as it's not really a measurement when checking this way but a go / no go check really.






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