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Massey Harris & Massey Ferguson Tractors Discussion Forum
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MF25 messy exhaust

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Phil

06-17-2004 18:19:13




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I've got a MF25 with a perkins 4-107 engine, all rebuilt, and running great: BUT! The exhaust pipe from the manifold connection down is dripping a very thin coal black fluid. This fluid has no smell of fuel or antifreeze, there enough coming out that the engine heat doesn't burn it it off.
Thers no bubbles in the rad when its running, and it only smokes when the load is increased until the engine manages the load, good response to the load changes.[ie: sawing wood] The visable smoke is a pale blue/whiteish in color. All 4 injectors have been changed out for a spare rebuild set,and the orginal 4 are rebuilt also, same result with either set of injectors. Only thought i have is A: fuel pump problem? or i have exhaust valve seal failure, has anybody got good news that its the seals and not a fuel pump?
Thanks for the help.

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GaryF

06-20-2004 14:22:56




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 Re: MF25 messy exhaust in reply to Phil, 06-17-2004 18:19:13  
Phil it may be possible that your muffler is plugged with that goop. Gary



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Tom

06-19-2004 16:52:48




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 Re: MF25 messy exhaust in reply to Phil, 06-17-2004 18:19:13  
Phil, you say "all rebuilt" and now you say it is maybe the valve seals leaking. It would help us to help you if we knew exactly what you "rebuilt". A complete rebuild would have included new valve guides and seals, among other other things.



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phil

06-20-2004 15:42:13




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 Re: Re: MF25 messy exhaust in reply to Tom, 06-19-2004 16:52:48  
OOPS on me: i have replaced the crank/oil pump/rings/1 piston/crank and rod bearing/bushings/valve cam and lifters/injectors rebuilt, i had a diesel class lap in the valves if needed[they did a kubota also which is running], but i didn't say to nor did i have the seals replaced. That is why i am leaning towards having good oil flow but worn seals, and it's sucking this stuff out on the exhaust stroke?
Just had a thought; what if the valve cover vent is plugged/closed etc?? will check that in the morning, this is just not "dads" day for diesel items. Thanks for help

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DP South Wales

06-19-2004 06:25:55




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 Re: MF25 messy exhaust in reply to Phil, 06-17-2004 18:19:13  
Phil,
Have you checked the thermostart yet. This is located in the inlet manifold and has one pipe and a thickish wire going to it. Remove the pipe and you will have about an egg-cup or less of fuel come out. Remove the unit (normally 1 1/16 spanner) and look at the coil inside. If there is any sign of dampness, extra fuel will be leaking into the manifold and the unburnt fuel will cause white smoke at the exhaust. Check the inside of the manifold. If its a greasy black, that's OK, If its wet with diesel then the thermostart will be a large part of your problem.
Cheers
DP South Wales

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Phil

06-19-2004 16:26:43




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 Re: Re: MF25 messy exhaust in reply to DP South Wales, 06-19-2004 06:25:55  
For years i never had a thermostart, and with the rebuild i installed a new unit, completly forgot about it being a possible problem[ forgot i had it], anyway i took the unit out completyly Didn''t find any fuel leaks, ran it for an hour, with the thermostart removed but connected, no fuel coming out.
Exhaust still bubbling crude so to speak.
Have remembered that i was running about 10lbs oil pressure pre rebuild and now i have a new oil pump, pushing 55/60 lbs. Maybe i am pumping oil up to the head/valve train faster than before.? Sort of "flooding" the valve cover area and IF i have bad seals, i am now sucking the excess down pass the valve stem[s] and out the exhaust.
And since the seals haven't been changed by me, i expect the previous 30 odd years have taken their toll.
Thanks for the hint, a good reminder if someone else ever mentions this subject, thanks

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naz

06-18-2004 18:49:50




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 Re: MF25 messy exhaust in reply to Phil, 06-17-2004 18:19:13  
Check out the problem on a previous message.I think I sent it right?



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Joe Ferguson

06-18-2004 08:42:11




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 Re: MF25 messy exhaust in reply to Phil, 06-17-2004 18:19:13  
Hi Phil

Is this situation is steady even few hours running
If occurs in the first 30 minutes it may be produced by air condensig in cold manifold and muffler producing water mixed with black deposits inside the exhaust stack. Is it a vertical muffler
if yes do you have a trap over the pipe to avoid
rain to get in ?


Not ex-pert
just my 2 cents worth

Good luck


Joe Ferguson

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Phil

06-18-2004 09:42:47




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 Re: Re: MF25 messy exhaust in reply to Joe Ferguson, 06-18-2004 08:42:11  
Bad news is that this "mess" is being created at a steady pace, i agree some condensation might happen but not after hours of running. Doing a running check at present, filled oil base to a known dipstick mark and have been running/working the splitter for about 3 hours. As soon as it totally cools and since i didn't move the tractor around, maybe i will find a difference in the oil sump level? Thanks for the reply

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jake

06-19-2004 23:11:16




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 Re: Re: Re: MF25 messy exhaust in reply to Phil, 06-18-2004 09:42:47  
have you tried running it under full load for a while? both of my tractors will start doing the thing if they're working under light load, such as log splitting, for a long time.



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