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Need help timing 880 diesel

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Mark

03-21-2003 12:29:59




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Let me explain what I am doing and please
correct the mistakes I must be making. On the compression stroke of #1 cylinder I am lining up the BTDC mark on the flywheel
(above the TDC mark as viewed through the access hole in the right side of the bell
housing) to the pointer on the bell housing. I can make out the TDC mark very well. There
is no FP mark and the rest of the marks are barely visible on the tape applied to the
flywheel. My I&T manual says Super 66, 770 & 880 diesels FP mark is located 25 to 26
BTDC. I measured 2 63/64" and put a mark to identify 26 degrees. That setup didn't work.
I was then told 6 degrees & counted 6 of the visible hash marks and marked that point. I
removed the injector pump drive gear cover plate and removed the gear and hub. The
Rossa Master pump timing window cover was unscrewed and the timing marks lined up on the pump. The hub gear was separated from the hub and the hub reinstalled, lining up the offset
dots on the keyed end of the hub with the one in the pump. The hub gear was then reinstalled and bolted to the hub making sure the timing marks had not moved on either the pump nor the flywheel. The pump gear cover plate was reinstalled and I attempted to start (I will wire the bolt heads of the drive gear once I find the settings are correct). The engine starts with starting fluid, but will not remain running. There is no port plug on the timing gear cover on this model above the pump drive gear. I have bled the fuel system in accordance to the information provided in the manual. I am attempting to start with the governor lever pulled down & the fuel stop pushed in. The pump and injectors have been rebuilt.

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Wrenchbender

03-22-2003 13:43:18




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 Re: need help timing 880 diesel in reply to Mark, 03-21-2003 12:29:59  

Are the "hash" marks you are counting on the tape on the flywheel? They may be two degrees per mark, so six would have you at 12 degrees BTDC. I think I would set it at TDC and try it there. The FP mark at 20 some degrees BTDC is way too advanced. WB.



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Mark

03-22-2003 18:09:08




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 Re: Re: need help timing 880 diesel in reply to Wrenchbender, 03-22-2003 13:43:18  
I'll change it tomorrow and let you know what happens. I'm getting really good at changing it now. Thanks all for the advise.



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Larry from MD.

03-21-2003 15:23:16




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 Re: need help timing 880 diesel in reply to Mark, 03-21-2003 12:29:59  
If you have the new rosa master pump then it should run on 6# btc.Sometimes thease pumps can be finicky.I can add a few things I have found.Don't loosen any of the injector lines when trying to start.When people handel the pumps sometimes the cut off lever gets pushed the wrong way and sticks so check that it is moveing the right way.Often people change or mess up the fitting on top of the pump which regulaters the flow of return fuel out of the pump.The fitting has a restrictor + a spring and check ball inside.You should get fuel flow out of this fitting when running or cranking good.I would say pull that tractor with another one untill it starts,that is usualy the best and fastest to get fuel flowing out where it should.

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Mark

03-21-2003 19:52:06




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 Re: Re: need help timing 880 diesel in reply to Larry from MD., 03-21-2003 15:23:16  
Thanks Larry
I went to check with an old Oliver dealer not too far from here and shot the **** with the mechanic. He said he never saw an 880 with the Rossa Master setup. I told him my manuals don't show any that way either. He said they were setup that way with the 1750 and 1755 series, but he imagined that a very late 880 could have been that way. I have no idea, but it is a 1962 model. The pump was just rebuilt. My manuals were telling me 25 - 26 BTDC and Larry Harsin told me 6 BTDC as did you. I tried that and it won't keep running and smokes like crazy on starter fluid. I haven't found the firing point (FP) mark on the flywheel anywhere, but the TDC mark is clearly stamped. The mechanic speculated this could be a gas conversion? I thought unlikely, but would check #'s. Still, I am scratching my head. I thought I would confer with the firm who did the pump rebuild for insight as to making sure the pump internal timing is OK. I really don't see pulling it as doing anything that the starting fluid hasn't already done because I kept spraying it until the smoke was too thick in the shed that I had to shut her down and let the air clear. I thought that would be enough to get the fuel up to the injectors. Am I wrong here? If you think I should pull it with another then maybe I should. Anyone else want to weigh in on this one? This tractor ran before I had the pump and injectors rebuilt, so I know it will again. The mechanic I spoke with said the 1700 era static timing should be 2 degrees or +1 more BTDC and that if I had it set at 6 and 2 or 3 was correct, it should have run anyway. I know it is on the compression stroke for #1. I know I ramble on here but am trying to provide as much information (although confusing) as I can. Any other suggestions? Thanks

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m kuhns

03-22-2003 18:34:33




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 Re: Re: Re: need help timing 880 diesel in reply to Mark, 03-21-2003 19:52:06  
We have a Super 77 diesel that we put a 1550 engine in. Looks about original except for the inj. pump which is the roosa master. The engines between the 77, 88, 770, 880 and 1550 are all identical except for the inj.pump, and a few more cubes. Which leads me to the inj. pump timing for a 1550 which is 2 degrees ATDC, yes ATDC. It should run within a about 5 degrees either way but will smoke. If this doesn't work, just play with the timing. Sounds like it is a little too far advanced right now so 2 degrees ATDC might be you solution, maybe not.

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