grinchsr 647 #1 Posted March 14, 2021 (edited) 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 March 14, 2021 by grinchsr Share this post Link to post Share on other sites
JohnD 145 #2 Posted March 14, 2021 (edited) 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 March 14, 2021 by JohnD adding detail Share this post Link to post Share on other sites
lynnmor 7,815 #3 Posted March 14, 2021 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. Share this post Link to post Share on other sites
Gregor 4,847 #4 Posted March 14, 2021 Ever since @pfrederishowed me how to find manuals and info, I've been finding all kinds of crap. 1 Share this post Link to post Share on other sites
grinchsr 647 #5 Posted March 14, 2021 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 Share this post Link to post Share on other sites
JohnD 145 #6 Posted March 15, 2021 Oops, i had funny math there. Standard is 14.7 psi at sea level, so 100 psi is 6.8:1. Share this post Link to post Share on other sites
Bill D 2,247 #7 Posted March 17, 2021 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? Share this post Link to post Share on other sites
grinchsr 647 #8 Posted March 17, 2021 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 Share this post Link to post Share on other sites
lynnmor 7,815 #9 Posted March 17, 2021 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. Share this post Link to post Share on other sites
Handy Don 14,061 #10 Posted March 17, 2021 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. 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). Share this post Link to post Share on other sites
grinchsr 647 #11 Posted March 17, 2021 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. 1 Share this post Link to post Share on other sites
Bill D 2,247 #12 Posted March 18, 2021 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 Share this post Link to post Share on other sites
grinchsr 647 #13 Posted March 18, 2021 Hi Bill. I will get some to you a little later. Baby sitting grand daughter currently Working on tractors is much easier. Lol Share this post Link to post Share on other sites