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Harry Ferguson Tractors Discussion Forum
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cylinder compression reading???

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Gene in La.

05-16-2006 21:31:39




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I've been told by my brother-n-law; which had the tractor be4 me; that the reason my TO20 won't handle my 5 Ft grass cutter, very well, is because the tractor is worn out and needs new rings and sleeves, so can someone tell me what the compression ratio reading for the cylinders should be, to still be in good shape! Thanks Gene




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gerard

05-17-2006 14:54:52




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 Re: cylinder compression reading??? in reply to Gene in La., 05-16-2006 21:31:39  
Unless the engine is burning oil heavily, or there's fair variation between cylinder pressures indicating possible gasket or valve problems, I doubt your problem is rings / sleeves. I was still getting full power on a TE20 with 15 thou wear in bores and a ring gap around 1/4 inch! There's a school of thought that more wear = less friction = more power. Even poor valve seating effect will dimish with revs. I'd guess you're simply trying to cut more than the tractor can handle - too low a cut, thick or long grass, blunt blades, etc.

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John (UK)

05-17-2006 04:11:39




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 Re: cylinder compression reading??? in reply to Gene in La., 05-16-2006 21:31:39  
Jerry is correct in what he says about cutting less grass, if you try to cut too much you wont have enough power to cope with it, the grass in the bottom is always hard to cut, keep the blades sharp too helps and they need to be balanced equally so it wont vibrate your mower to bits. Make sure that you radiator is clean right through as well or it may overheat, use a flashlight at the back of it and look through from the front, you should be able to see right the way through the Radiator core easily, you may need to wash the core out with a hose pipe, from the back to the front, get right into those corners too. Make sure that the oil and filter is changed often too, it can get quite hot when mowing and the oil will deteriorate.

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Gene in La.

05-17-2006 21:22:36




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 Re: cylinder compression reading??? in reply to John (UK), 05-17-2006 04:11:39  
Thanks John, hoping to hear from you! I've checked what you said & all ok, cutter setup as recomended 4" in front & +1" in rear with a tail wheel. Governor seams to maybe the problem, thats what I've been tinking with!



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Jerry/MT

05-16-2006 21:43:55




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 Re: cylinder compression reading??? in reply to Gene in La., 05-16-2006 21:31:39  
Compression should be above 90 psi on a warm engine tested with the throttle valve wide open with no more that 10 psi variation between cylinders. These minimum numbers are somewhat arbitrary as I don't believe the factory manuals specify a minimum level. If you have a 5 ft rotary cutter and you're trying to cut grass that's above the hood of the tractor and having a problem, cut a foot or two less swath or drop down a gear and see if that helps. Also make sure that the front end of the mower is about 1/2 to 1 inch lower than the back so you only cut the grass one time.

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