Another F806 question....

This F806 D361, has an M&W after market Turbo on it. Has plenty of power & runs good. It does smoke quite a bit under a moderate load such as a 4 bottom plow. It usually will not start with out ether if it's below 75 deg. or so. Have 2-6 volt batteries and 2/0 cables. Turns over pretty fast. I read the manual and checked the Roosta pump timing. Went clockwise and put the timing on the flywheel on 8 BTC. Took the cover off the pump to look at the timing marks and had to shutoff the fuel because it was draining out of the site window. Looked at the timing marks and the marks were a bit off with the pump mark being about 2 widths of the mark below the permenant mark. (See photo) Didn't change anything with the pump. I did move the flywheel to 6 btc and the pump marks lined up. Is this O.K.? I was thinking that the pump might have been set differently than factory because of the M&W turbo. Or, should it be lined up like factory. I was just trying to see if there was any way I could get the tractor to start eaiser. Or, should I best leave it alone? Thanks again for th help Dan

The manual calls for 8deg btdc 6 on the 856 and 2 on a 1456.

Hi Dan,

One or two degrees makes all the difference in the world on how they start.

Get the engine warmed up good. Rotate the top of the pump away from the engine until it starts to "flare" and you see a bit of grey smoke AT WIDE OPEN THROTTLE.

Mark this location on the flange. This is your "winter/cold weather" setting.

Now, back the pump up about a pencil width or until the flaring/smoking just stops. Make another mark. This is the "summer/normal" setting.

These positions would be the optimum timing settings. If it still starts hard, I'd be for checking if we have low compression.

Allan

Now where in god green earth did you come up with this goofy idea on timing a D361 Good way to either wash the cylinder wall down with unburnt fuel or melt a hole thru the top of a piston .

From a long time IH mechanic.

Nice part is that it really works sweet.

Allan

All wright ya got a 806 with a M&W turbo on it and ya got smoke move the timing up to 6to 8 degrees BEFORE tdc and see if the smoke clears up . If it does not then turn the load screw IN on the pump to back it down a wisker and for god sakes put a pyrometer on it before you have a melt down and depending on where the probe is installed is important as to how HOT you can run it at . Hot as to your hard starting Well there are several things that come into play here . Lets start of with the bug juice you have been shoven down it's throat That can whipe out the rings or brake the top rings out of a D 361 fast and there for drop compression and that make for hard starting and this can lead to your smoke problem . The pump timing being late can also do this . next is when was the last time that it was tuned up and the valves adjusted ?? and when was the last time that it was rebuilt . i mean a real rebuild and done correctly as this engine is not for the novice to rebuild , as it has more quarks then i want to go into now . Next how bad are the valve beat into the head and valve recession will lead to hard starting on them . Next the cranking pressure of the pump if it is low then it will not crack the inmjectors prpperly . Next how are the injectors are then leaking and not cracking at the spec. pressure . When a D361 is wright they need no either at all down to 0 . That is what sold one 806 that i had to a guy is the fact that it would START COLD and i mean COLD like minus 35 . it was during the Blizzard of 77 and most of the roads were still closed and my buddy and i were at the shop working on my Pick up fixing the plow and this guy walked in and said that he heard that we had a 806 for sale and he wanted to see it . Hey i will sell anything anytime so we had to take the back Hoe and work for and hour to even get to the tractor that had been setting since the fist week in Nov. in a three sided shed took the pick up down so we could put the jumpers to it if we had to . My buddy got up on it cracked the throttle and hit the button and i gave it a vary light and i mean light shot of bug juice and she fired and it was -35 The 806 i have now will start down to 2025 above with out either and she has almost 9000 hours on her and never been down yet just a valve adjustment and pump and injectors done to her .

Yea wright With all the years i have worked on the D361 and been around that tractor i think i know a bit about them and like i said that engine is not for the novice as i have seen first hand the problems that happen when someone that does not know what they are doing with them . In all my years of wrench twisten there are two engines that make me shudder when working on them one is a Detroit and done many and the D361-407 . They are not a small block cheve that any idiot can work on and get them close as there is no close is good enough

Hey Dan!

Please disregard my earlier post.

Allan