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JD-1020 COMPRESSION

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MARK

07-06-2002 23:22:01




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Ok I just got a good compression gauge and tested the cylinders. 3 cylinder gas engine. Back cylinder has 120psi middle has 60 psi and front has 90 psi, I think it's from sticking rings. Will this thing even run with pressures like these?
Also I have checked the cam timing and it was one tooth off so I corrected this but, this thing still blows then sucks on the exhaust outlet while cranking.
Could someone with one of these things [jd1020]please pull their coil wire and put their hand over the exhaust pipe and see if theirs does this same thing while cranking?
Thanks
Mark [frustrated]

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John

07-07-2002 14:09:41




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 Re: JD-1020 COMPRESSION in reply to MARK, 07-06-2002 23:22:01  
Sounds like someones werked on this machine before you. Pull the valve cover off and check the rocker arm adjustment. Then check for compression leaks.



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Steve - IN

07-07-2002 07:28:46




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 Re: JD-1020 COMPRESSION in reply to MARK, 07-06-2002 23:22:01  
Mark,

Chuck's idea about leakdown testing is a good one. I'd bet you'll probably hear the air escaping from the exhaust valve on the front and middle cylinders. Rings aren't going to cause that sucking sympton on the exhaust side, but a bad exhaust valve surely would.

I bet after you pull the head, replace those two exhaust valves and clean up the seats, it will run just fine!

Steve



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ChuckW

07-07-2002 04:38:22




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 Re: JD-1020 COMPRESSION in reply to MARK, 07-06-2002 23:22:01  
there's not much to be frustrated over. If you want to remedy the problem you'll probably need to go into the engine, sounds like leaking exhaust valve problems. You might pull the valve cover and remove one plug at the time, inject air into the cylinder, take a brass hammer and tap the valves while they're on the compression side and listen for air leaks. You could just have excessive carbon build up on the values. But as far a blow by, that definitely is rings. I would suggest a minor overhaul, rings, rod bearings and valve grind job.

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Mark

07-07-2002 19:44:30




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 Re: Re: JD-1020 COMPRESSION in reply to ChuckW, 07-07-2002 04:38:22  
I have already had the head off and everything looked almost new. This is what I did, pulled the timing cover off the front of the engine and found the cam timing 1 tooth off and after correcting that I temporarily put the cover back on and trie to fire it up. Guess what!!!!!
It fired up. YEEEEEHAW!!!!!
Now I get to disassemble and use new gaskets for the reassembly and check averything else out.
I tried blowing air into the cylinders with the compressor and found none of the valves leaking to the intake or exhaust manifolds but could hear some blowby. I'll let you all know what happens when reassembly is complete. If it doesn't run to satisfaction I'll probably do as you said and do a rering and bearings and possibly valves too.
Thanks for all your suggestions.
Mark


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