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Compression for a TO-20?

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george

11-16-1999 17:01:18




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I am interested in checking the compression of my TO-20 to help me decide if I should tear down and rebuild. I have no idea what compression I should be looking for. The service manual I bought doesn't say. Anyone able to help?
thanks in advance




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Ernie

11-20-1999 17:02:15




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 Re: compression for a TO-20? in reply to george, 11-16-1999 17:01:18  
110-120 psi is normal for a 7-8 to one compression ratio. Anything lower than 90 is tough to start. If it starts ok and doesn't use oil, why bother?



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george

11-24-1999 18:31:47




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 Re: Re: compression for a TO-20? in reply to Ernie, 11-20-1999 17:02:15  

thanks for the help. My Ferguson smokes like a steam engine when I first start it, but it clears - up in a minute or so. The valves sound rather noisy to me, but I have never owned a Ferguson before, to know if thats the case or not. I'll check the compression and see what I get. If the compression looks good, I'll just live with the smoky starts.



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Neal

11-25-1999 05:43:09




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 Re: Re: Re: compression for a TO-20? in reply to george, 11-24-1999 18:31:47  
Are you sure its oil smoke? My TO-20 also smokes a lot on startup after sitting but it is from an over rich condition. I think that the float needle in the carb is not shutting off the fuel completely. I'm going to try to rebuild the carb and see if that fixes the problem.

Neal



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SandyB

11-24-1999 19:01:44




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 Re: Re: Re: compression for a TO-20? in reply to george, 11-24-1999 18:31:47  
George,
The valves are going to be noisier than your car, because they are solid lifters rather than hydraulic. The valves also might be in need of adjustment. I was looking in my service manual to see if the valves have seals...sorry, it's a little vague, so I don't know. Have'nt had the valve cover off of mine yet. What I was thinking, is that oil might be leaking around the valves.
Sandy

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Ernie

11-25-1999 19:18:52




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 Re: Re: Re: Re: compression for a TO-20? in reply to SandyB, 11-24-1999 19:01:44  
Oil (blue) smoke on start up is indicative of valve seal problems. If your compression is good pop the head and do a valve job. Check the head for flat (had one warp when it overheated), which will also ruin valve seals. If the oil consumption is not too bad, I would postpone the whole deal. The suggestion about check the valve cleances is a good one. Check head torque while you are at it. Don't forget the nuts by the spark plugs.

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george

11-29-1999 08:12:35




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 Re: Re: Re: Re: Re: compression for a TO-20? in reply to Ernie, 11-25-1999 19:18:52  
Thanks All.
My Ferguson smokes (blue smoke) when I first start it. I get 85 - 90 PSI on three cylinders, #2 cylinder is about 75 psi. Number 2 sparkplug looks black and slimy. The others look good. From what I am hearing from everyone, sounds like my Ferguson would benefit from pulling then head and working on the valves, guides, and seals, especially on #2 cylinder. I just got a Service Manual for my TO-20, yeah ! My Ferguson runs good except for the smoky starts, I may hold - off on pulling the head for a little bit, I am wanting to convert to 12 Volt first.

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Ernie

11-29-1999 17:00:58




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 Re: Re: Re: Re: Re: Re: compression for a TO-20? in reply to george, 11-29-1999 08:12:35  
Squirt an ounce or two of oil in each cylinder and rerun your compression test. If they all come up a bunch its rings.... Do you hear a lisp in the exhaust at ilde? Thats a sign of a bad valve. Excess blow by from the crankcase breater is indicative of bad rings. Your continental engine is a fine puller but has small exhaust valves. Never burned one though.

My bet is bad rings.



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