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Oliver, Cletrac, Co-op & Cockshutt Tractors Discussion Forum
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1650 Tune Up

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Adam- WI

01-06-2006 08:25:58




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Ok guys, I thank you for all of your help so far. For all of you that don't know, my 1650 keeps fouling plugs and is running like crap. I put new plugs in and it runs good until a plug fouls out. So far I've replaced coil, cap, rotor, wires, no points, this tractor has pertronix ignition, replaced air filter. I have spark and as of today I have compression. I checked the engine compression today and get readings of #1-145, #2-135, #3-120, #4-125, #5-145, and #6-125. Are these ok or do I have internal engine problems. The one cylinder I thought might have a problem because there is a leak at the exhaust manifold was #5, but that reads right at the top of my compression. If this is ok, it has to be carb related problem. Any help would be great, sorry for the long post.

Adam

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RAB

01-06-2006 09:51:55




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 Re: 1650 Tune Up in reply to Adam- WI, 01-06-2006 08:25:58  
Your compression tests are not that good.
25 psi between top and bottom is too much really.
Now you can match your plugs with the compression pressures and see if the low pressures are the oily plugs.
By the way have you checked/adjusted the valve clearances before doing the compression test. If not, that test may be worthless.
If the plugs are oiling, you should be noticing a rate of oil burn.
Oil could still be coming down inlet valve guides and into the cylinders. If it has been running out of spec for a long time, rings might be gummed - like you said, the previous owner may have caused you problems. He may have used inferior oil, not changed it. regularly, etc.
Running the engine too rich will have put soot down into ring grooves.
Try a wet compression test immediately after a normal test to see if it is piston ring leakage, or do a compressed air test to find where the leakage is occurring.
Sounds to me that the ignition system is now, or has been all along, giving a strong blue spark. Just as a thought, how long a spark can you draw now, as opposed to before you changed anything?
Regards, RAB

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old

01-06-2006 08:29:13




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 Re: 1650 Tune Up in reply to Adam- WI, 01-06-2006 08:25:58  
First off you need to figure out what is causeing the plugs to foul out on you. Is it oil fouling or gas fouling. The fix for either of them is differant then for the other. What do the plugs look like when you pull them??



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Adam- WI

01-06-2006 08:39:34




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 Re: 1650 Tune Up in reply to old, 01-06-2006 08:29:13  
The plugs are black, some are dry and look like carbon buildup, others are black and wet. Are these compression readings good or not?

Adam



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old

01-06-2006 08:45:35




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 Re: 1650 Tune Up in reply to Adam- WI, 01-06-2006 08:39:34  
Those reading are ok, not great but not to bad either. They the plugs look black and oily or black and dry. If there black and dry you have a carb problem. If there black and oily you have ring or valve problems. Have you tried a hotter plug in that engine.



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Adam- WI

01-06-2006 08:55:11




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 Re: 1650 Tune Up in reply to old, 01-06-2006 08:45:35  
I am running Autolite 65's, one step hotter than recommended. I was just reading an old post from 2001 about a similar problem as I am having. They mentioned carb icing as a possible culprit. This tractor ran fine when it was warm out and now runs crappy in the cold, never fouled a plug when it was warm out. I did notice that every time I run the tractor in the cold, the outside of the carb is covered in ice. Once I shut the tractor off this melts away.

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SFR

01-07-2006 00:50:24




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 Re: 1650 Tune Up in reply to Adam- WI, 01-06-2006 08:55:11  
My experience with newer Oliver gas tractors is that Autolite plugs won't work. I have had Autolite plugs run as few as 15 min. and not run again. Try AC Delco R42XLS or R44XLS.



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evielboweviel

01-06-2006 12:19:07




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 Re: 1650 Tune Up in reply to Adam- WI, 01-06-2006 08:55:11  
put a heat houser on it and a feed sack in front of the radiator. Also is the tstat working ok?
Ron



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old

01-06-2006 09:17:43




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 Re: 1650 Tune Up in reply to Adam- WI, 01-06-2006 08:55:11  
If its carb iceing which it could be, a side cover would help. Or letting it warm up real good before useing it. Carb iceing is common this time of year and its just a fact of life and the way engines/carbs work. The old fleetline Olivers with full side curtains never had much problem with carb iceing because the side curtains held engine heat in around the carb. A cover put over the engine/hood may help and of course letting it warm up some before you work it will help.

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