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grinchsr

P220 Compression

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grinchsr

I just did a compression test on my 1992 520 with 1176 hours on the clock.  Rear cylinder had 140 PSI and the front had 128.  I thought 100 PSI was normal.   Test taken with choke and throttle wide open   Thoughts??

Edited by grinchsr

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JohnD

I believe people will say that's pretty good, about 4-6:1 compression. 100 psi is only a little better than 3:1, and the KT-17 manual indicates less that 90 psi can indicate issues, and your cylinders should match between 15%. Yours are within 10%. 

 

Edited by JohnD
adding detail

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lynnmor

Many compression testers are not very accurate, but that rear cylinder may be too high.  Unless you have done a de-carbon, it is over due and may be the cause of the high reading.

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Gregor

1219475613_Screenshot_2021-03-14492-4006OnanP216P218P220P224SMpdf.png.008a91d29c1919b3d828ca6e2150ef8c.pngEver since @pfrederishowed me how to find manuals and info, I've been finding all kinds of crap. :)

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grinchsr

Sounds like it needs some TLC.  I just picked it up a month ago because the price was right.  It was hard to say no to another red tractor    LOL

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JohnD

Oops, i had funny math there.  Standard is 14.7 psi at sea level, so 100 psi is 6.8:1. 

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Bill D
On 3/14/2021 at 4:11 PM, grinchsr said:

Sounds like it needs some TLC.  I just picked it up a month ago because the price was right.  It was hard to say no to another red tractor    LOL

Pictures?:wwp:

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grinchsr

Hi Bill   I can get some pics as soon as I find the tractor under all the crud.  Not much to look at yet until I get the power washer out and it is still too cold for that

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lynnmor
4 hours ago, grinchsr said:

Hi Bill   I can get some pics as soon as I find the tractor under all the crud.  Not much to look at yet until I get the power washer out and it is still too cold for that

 

With a pressure washer, you might force that crud and water by the seals, into spindles and into other places it should not be.  I use Purple Power with a brush and a garden hose. 

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Handy Don
40 minutes ago, lynnmor said:

 

With a pressure washer, you might force that crud and water by the seals, into spindles and into other places it should not be.  I use Purple Power with a brush and a garden hose. 

:text-yeahthat:

I use pressure washer only on parts that cannot get damaged by my cavalier technique!

Once I have that wand in my hands, EVERYTHING looks a little dingy and in need of a spray (exceptions for pets, small children, and spouses of course).

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grinchsr

You are right but pressure washers are so much fun 🤩.  Seriously I also use Purple Power good stuff.  I am normally careful what tip I use on the wand but it is always tempting to get aggressive with it and I am also careful what I am shooting it at. 

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Bill D
19 hours ago, grinchsr said:

Hi Bill   I can get some pics as soon as I find the tractor under all the crud.  Not much to look at yet until I get the power washer out and it is still too cold for that

I still would like to see some "before" pictures.  I love comparing the before and after pictures.  Bill

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grinchsr

Hi Bill.  I will get some to you a little later.  Baby sitting grand daughter currently    Working on tractors is much easier.  Lol

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