Piston Ring Gap

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Piston Ring Gap

Post  Jim the Shovel on Sat 24 Sep 2016, 6:17 am

Can anybody give an idea what the piston ring gap should be.
Mine is about 5 or 6 thou. That seems a bit tight to me.
Would have thought 10 to 15 thou would be nearer the mark.

Jimbo

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Re: Piston Ring Gap

Post  lynnr on Sat 24 Sep 2016, 7:37 am

Mine are about 10

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Re: Piston Ring Gap

Post  Jim the Shovel on Sat 24 Sep 2016, 12:55 pm

Thanks for the confirmation Lynn

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LP piston rings

Post  storey on Tue 18 Oct 2016, 3:36 pm

My LP piston is exceptionally tight in the bore, to the point where I can almost push the engine with the amount of force required to move the LP piston. What would people suggest ? A colleague at work talked about honing the bore but that's something I'd really rather not do!

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Re: Piston Ring Gap

Post  Mark the spark on Wed 19 Oct 2016, 12:28 am

I hone the bores on all my engines the machined finish is not as good as you think sometimes
When you start to hone the bore the true finish will be seen and in most cases it made up from "hills" and "valleys", they may be only 1or2 thou deep but they are there
its easy to do and only takes about 4 to 5 mins to do but you end up with a lovely bore, just use plenty oil as you do it
hope this helps
Mark



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Re: Piston Ring Gap

Post  Jim the Shovel on Wed 19 Oct 2016, 2:25 am

Thanks for the info Mark.
I have just bought some stones to hone mine, was surprised how cheap they are 10 for the HP and 20 for LP. The HP is not too bad just needs a little tickle up, but the LP is very tight. Unfortunately I have already gapped the rings so hoping that they will still be OK after honing.

Jim

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Re: Piston Ring Gap

Post  lynnr on Wed 19 Oct 2016, 3:07 am

The difference honing will do will not change the ring by any measurable size.

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Re: Piston Ring Gap

Post  Jim the Shovel on Wed 19 Oct 2016, 3:26 am

That's right Lynn. 1 thou or 2 on the diameter is next to nothing on the circumference. Thank you Mr Pi.

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Re: Piston Ring Gap

Post  hartshaulage on Wed 19 Oct 2016, 11:02 am

On the foden i just used a piece of corn flake packet to set the gap, never had a problem yet with them and been running for a few months now which included a 10 mile road run

Russ

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Re: Piston Ring Gap

Post  mikero on Thu 20 Oct 2016, 4:35 pm

How much water did that use Russ?

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Re: Piston Ring Gap

Post  hartshaulage on Fri 21 Oct 2016, 11:29 am

Hi Mike , i think it used 3 lower tanks thats from leaving the field getting to the pub and back. I only have the lower tank fitted as well so i was down on water capacity

Russ

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