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860 Running

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DonCam

02-19-2007 19:11:14

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Started the 860 today first time since the teardown of it in August of last year. Did't have the sheetmetal on it yet but wanted to make sure everything worked well. It fired up as soon as I hit the starter. Sounds good even though loud, since I chose to go with the straight exhaust, may have to put a muffler. Warmed it up, it maintains a steady 42 pounds of oil pressure hot and cold. Did find though that it's dieseling badly when I shut it down. I am suspecting this is because I have a 134 head on it and the compression is a bit high. Did find though it does it much less when I go to idle before shutting it down. Hydralics seem to be working fine, though no load on it yet and tranny and clutch worked very good, also had some brakes for a change. Now to the worst part, doing the sheetmetal, body work..

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BDT in Minnesota

02-21-2007 19:12:04

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Re: 860 Running in reply to DonCam, 02-19-2007 19:11:14

Don, I would definitely idle the engine down to an idle before turning the ignition off..Even if the engine didn't diesel, you are still drawing the fuel mixture into the engine..if the throttle is open, you draw more, and the extra speed ( momentum )of the flywheel will prolong the time it takes for the engine to stop..this can wash the engine interior with unburned fuel (not good)because the ignition is not on to ignite the fuel..This is also a good way to get that BANG out of the muffler soon after a tractor is shut off..(not good either). It is simply best to idle the tractor down before turning the ignition off..

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Dave in Ms

02-20-2007 08:34:42

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Re: 860 Running in reply to DonCam, 02-19-2007 19:11:14

If I remember right, higher compression needs more advance in the timing. Play with it some and see if dieseling stops. If not you may want to go to 2 head gaskets to lower compression.
Dave

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souNdguy

02-20-2007 06:21:55

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Re: 860 Running in reply to DonCam, 02-19-2007 19:11:14

I got 2 'bandaid' ideas for you to try.

I'm guessing you are using a small gas tank to run this right? ig so.. grab a gallon of hitest.. high octane fuel..like 93.. etc.

Also, grab 4 anti-fouling adapters for your spark plugs.. and add them.. also, swap in a lower heat range plug. if you are using champion h12.. go to h10.. and if autolite 437.. then go to ?? 216's

The anti foul adapters will lower your compression a tad.. sounds like that may help some. The hi octane gas should help combat run on as wella s the lower heat range plugs.

If you are lucky, the plugs and adapters will do it for you as long as you shut off at idle...

If ya don't have hi test gas handy and want to test his.... a tad bit oh' diesel in your gas will do the same...

Soundguy

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john_bud

02-19-2007 20:10:25

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Re: 860 Running in reply to DonCam, 02-19-2007 19:11:14

Don,

It's always a good feeling to have one fire right up!

Since you mention it, the 134 head is probably raising the compression. It may tend to overheat when working hard at things like pulling a plow etc. That is why they had 7.5:1 compression ratio, so that under constant high load they wouldn't over heat.

The dieseling is probably more related to fuel. Usually the throttle not closing all the way, or the carb too rich (or leaking). May want to double check that.

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