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Average compression psi on lawn mower engine


Rjwig's Avatar
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12-05-15, 03:33 PM   #1  
Average compression psi on lawn mower engine

Is there a general compression test value on a 15 year old lawn mower engine showing the compression is ok?

 
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12-05-15, 04:10 PM   #2  
Hello Rjwig,


Much below 65lbs and the engine will be harder to start and be low on power.....

 
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12-05-15, 04:53 PM   #3  
1. Does it smoke ?

2. OHV or flat head ?

3. Model and type first 4 #'s of the code would help ~!~!

 
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12-06-15, 05:04 AM   #4  
If you are having trouble with the engine I much prefer a leakdown test. A compression test will just provide a compression number. A leakdown test will also show good or bad compression and allow you to determine where a problem lies; blown head gasket, leaking intake or exhaust valve, worn piston or rings or cracked head...

 
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12-06-15, 08:06 AM   #5  
12v802 bs flat head engine

This engine starts pretty well but consumes a good amount of oil. I can't see smoke except at start up (smallish amount) I believe I measured about 65 on the compression test.I'm considering rebuilding it because it is easier to push with bearing wheels and has been dependable.I'll check into a leak down test.

 
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12-06-15, 12:38 PM   #6  
I think B&S used to say if you pulled on the starter rope without your foot on the mower and it started to lift the mower the compression was good. Have a good one. Geo

 
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12-06-15, 05:11 PM   #7  
I have a Troybuilt with bearing wheels and a 6.5 hp Briggs on it. Very easy to push and very quiet.

Look under your the deck and see if the seal is good. That won't be a compression issue but you might see where your oil is going.

Try to use another comp gauge to see if the two match.

 
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12-13-15, 06:37 AM   #8  
mower

Thanks everyone for the input.

 
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