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post #1 of 17 Old 03-17-2017, 01:59 PM Thread Starter
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Too deep of a LB cylinder scratch?

I bought LB 8270 that runs and an R8237 that doesn't.$25 for the pair. Both F engine.8270 had min.compression(80) and some leaks,I bought seals and rings and misc.to rebuild 8270 motor,my first attempt at something like this.I was reading another thread here about a rebuild and it was mentioned if a scratch in cylinder wall catches a fingernail the cylinder is junk.Well,my cylinder seems to have one of those.Is it indeed junk???If so hopefully the R8237 cylinder,that has really low compression,is in better shape.
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post #2 of 17 Old 03-17-2017, 05:03 PM Thread Starter
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Re: Too deep of a LB cylinder scratch?

Pic of cylinder after honing.Does that make any difference as far as being usable or not??
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post #3 of 17 Old 03-17-2017, 05:59 PM
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Re: Too deep of a LB cylinder scratch?

I would just use it before saying its junk. I wouldn't imagine 1 scratch like that would make the cylinder "junk".
I have been thinking of ideas to save wore out Lawn Boy cylinders. I wonder if a machine shop like Millennium could put a sleeve in or if there are chrome rings that will work with the piston a nikisil plating would last pretty much forever.

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post #4 of 17 Old 03-17-2017, 06:47 PM
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Talking Re: Too deep of a LB cylinder scratch?

I would say you have nothing to lose in giving it a try. Lawnboys are pretty forgiving. I have read many storys of mowers that were straight gassed and frozen up and were freed up, cylinder cleaned, and used. You may have a small amount of compression loss but think about the scratch size and how much compression would actually leak by compared to how much stays in at the compression stroke. Good luck and keep us posted. Bill

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post #5 of 17 Old 03-17-2017, 07:10 PM
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Re: Too deep of a LB cylinder scratch?

Looks like pretty deep scoring, personally I wouldn't waste my time and money on it. I think there is a good chance the cylinder bore is way out of limits anyway after all the honing was done. There are plenty of good used F series engines/cylinders out there for a decent price, so really not much of a need to mess with that worn out cylinder. I know compression will probably be within range (on the lower side), but I'd be worried more about the piston slapping going on than the compression loss...yes, been down that road recently and it's not a good road.

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post #6 of 17 Old 03-17-2017, 08:03 PM Thread Starter
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Re: Too deep of a LB cylinder scratch?

Well,I'm going to tear down the R8237 motor tomorrow and see what that cylinder looks like.
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post #7 of 17 Old 03-17-2017, 11:37 PM
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Re: Too deep of a LB cylinder scratch?

The bad thing about buying another used cylinder assembly is you are still just taking a crap shoot. Its too bad nobody makes over size pistons for these motors, there is definitely a market for it.

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post #8 of 17 Old 03-18-2017, 12:47 PM
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Talking Re: Too deep of a LB cylinder scratch?

Lawnboy77 makes a great point regarding the specs on the cylinder. If you have the tools or know someone that does, be sure to measure the ID of the bore. That would at the very least give you an idea if the bore is within specs or not. I don't think I have ever seen a cylinder being sold on eBay where the seller has already measured the internal diameter of the bore and provided that information so as it was mentioned above it's a crap shoot. Good luck and let us know how you do. Bill

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post #9 of 17 Old 03-18-2017, 04:31 PM Thread Starter
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Re: Too deep of a LB cylinder scratch?

Well,I got the R8237 motor torn down.Lots of carbon but not totally blocked,rust inside,one ring stuck to piston,and looks like a bit of something stuck to cylinder wall.But I think this one is usable.
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post #10 of 17 Old 03-20-2017, 11:23 AM
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Re: Too deep of a LB cylinder scratch?

yes that one looks to be quite a bit better than the first one you posted. I see a little aluminum transfer, but should be no big deal.
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post #11 of 17 Old 03-20-2017, 07:14 PM Thread Starter
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Re: Too deep of a LB cylinder scratch?

Quote:
Originally Posted by Lawnboy77 View Post
yes that one looks to be quite a bit better than the first one you posted. I see a little aluminum transfer, but should be no big deal.
I got the motor back together using that cylinder,and the reeds.The crank from the 8270 was in better shape so I used that one.The 8270 has the hex governor,the R8237 the round gov., so I'll use that one.Kind of odd they have two different carbs since they are both 1980 per LawnBoy serial number search.They each had different shrouds,I think one was replaced at one time since it has a date stamp of Dec. 1981,this one has the extra vents on top.The R8237 deck has less wear on it and not cracked so hopefully in the next few days I'll get that motor mounted on it and see if I did any good with it! Then I can get to making it look better with a repaint.
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post #12 of 17 Old 03-24-2017, 04:41 PM Thread Starter
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Re: Too deep of a LB cylinder scratch?

Welp,got the motor put back together and mounted on the R8237.It took a bit of priming and messing with the mixture needle but I did get it running.woo hoo!! I don't think I should run it anymore until grass cutting time to break it in with a load on it...right?Now I want to give that deck and housing a going over.It's kind of rough.
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post #13 of 17 Old 03-24-2017, 06:04 PM
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Re: Too deep of a LB cylinder scratch?

Good work, nothing like hearing one come back to life.

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post #14 of 17 Old 03-24-2017, 06:44 PM Thread Starter
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Re: Too deep of a LB cylinder scratch?

Quote:
Originally Posted by unclelee View Post
Good work, nothing like hearing one come back to life.
Thanks,I was getting a bit bummed when it didn't fire up right away,but it sure was a nice sound when it got to running right!!
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post #15 of 17 Old 03-25-2017, 10:28 AM
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Re: Too deep of a LB cylinder scratch?

Outstanding! It good hear all these classics being brought back to life.
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