Engine rebuilt and smoking badly.

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Larry B
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Re: Engine rebuilt and smoking badly.

Postby Larry B » Sat Apr 03, 2021 5:10 pm

If you installed new spark plugs after the rebuild have you pulled them and looked at them?

Megoto
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Re: Engine rebuilt and smoking badly.

Postby Megoto » Sun Apr 04, 2021 3:11 am

Yes all 4 look like they have been in there for a few years

Megoto
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Re: Engine rebuilt and smoking badly.

Postby Megoto » Thu Apr 08, 2021 7:23 pm

Ok so here's the update. Took pistons out again and they mik'ed out to be standard pistons. The cylinders, however seem to have been bored out 0.010 over. I measured them at least 6 times each x/y axis top,middle, and bottom 2.6345 it's the same on all 4. So my question is does someone even make a 0.010 over set for these engines? The smallest I have seen is 0.020 over. Thank you
Last edited by Megoto on Fri Apr 09, 2021 2:21 am, edited 1 time in total.

tst
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Re: Engine rebuilt and smoking badly.

Postby tst » Thu Apr 08, 2021 7:28 pm

if that is so take the rings off one piston stick it in the bore upside down, if you can put a .010 feeler gauge between the cylinder and piston you have found the problem, piston clearance should be .003-004 at the most

Megoto
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Re: Engine rebuilt and smoking badly.

Postby Megoto » Thu Apr 08, 2021 7:31 pm

Haven't done that yet but I will do that right now. Thanks for the suggestion.

Megoto
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Re: Engine rebuilt and smoking badly.

Postby Megoto » Thu Apr 08, 2021 7:45 pm

So the .010 feeler gauge fit so no I know for sure. I also, just for good measure, put one of the compression rings in the cylinder it came out of and measured the gap. It came out to .045 so that's not right. I put standard rings on the standard pistons on the advice of my local tractor mechanic. I wish he would have mentioned measuring the cylinders. Oh well, learning experience just not a cheap one :(

tst
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Re: Engine rebuilt and smoking badly.

Postby tst » Thu Apr 08, 2021 10:55 pm

sounds like you need to bore, always ck ring gap before installing if they are to tight they can break, gap is to wide you will get smoking and no power

outdoors4evr
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Re: Engine rebuilt and smoking badly.

Postby outdoors4evr » Fri Apr 09, 2021 6:19 am

Most people just use standard pistons with oversized rings. Purchase rings that are .020 over and file them so they have a very tiny ring gap.
I'm guessing that you have a wide ring gap with the standard sized rings.
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tst
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Re: Engine rebuilt and smoking badly.

Postby tst » Fri Apr 09, 2021 7:23 am

installing rings in a worn bore is a waste of money and time, will work for a short time and you will be back where you started

Eugene
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Re: Engine rebuilt and smoking badly.

Postby Eugene » Fri Apr 09, 2021 10:11 am

Megoto wrote: The cylinders, however seem to have been bored out 0.010 over. I measured them at least 6 times each x/y axis top,middle, and bottom 2.6345 it's the same on all 4.
Worn cylinders usually have taper and out of round, --- not uniform measurements. And 2.6345 is not quite .010 over 2.625.

I don't think the cylinders has been bored and then standard pistons replaced/reinstalled. I think your measurements are off.

My thought/suggestion is that the engine block will probably have to be bored. Take it to a machine shop and have them measure it.
I have an excuse. CRS.


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