DB 885 Raw fuel in exhaust.

Okay. I put a new fuel pump on this tractor and now it cranks up and runs. However, it smokes pretty bad at high rpm's, something it did not previously do, and doesn't have much power. Plus, raw diesel is squirting out of the connection between the exhaust manifold and the exhaust pipe. I removed the injectors and found that there were no copper compression seals in the bottom of the ports in the head. I never heard of a diesel engine that did not require copper compression seals in the bottom of the ports. But apparently this tractor didn't have any when I bought it several years ago because this is the first time I've removed the injectors, and the tractor has done a good bit of bushogging for me up until just recently and ran just fine until the fuel lift pump stopped working. So I put a copper seal in each hole, put the same injectors back in place, cranked the tractor, but that made no difference. I'm still getting raw diesel blowing out of the exhaust manifold, as well as seeping up into the depression in the head where each port is. I took the injector that was leaking diesel on top of the head and had the tip replaced again. Now it doesn't leak when the tractor is running, but the one closest to the driver does. I'm having the other 2 injectors checked this afternoon. I already had the injector pump checked. My questions at this point are: Are David Brown 885 injectors not supposed to have compression seals at the bottom of the injectors? Could there be any other reason that raw diesel is spraying out of the exhaust manifold connection to the exhaust pipe, other than a "peeing" injector?

Parts list shows a copper gasket for the injector. If engine is low on compression that will cause the exhaust dripping you describe too. Only way to know what condition engine is in is to do a compression check.

They should have washers on them. The shop that does my injectors provides them when servicing injectors, or even just checking them.

make sure they aren't stuck in the head.

raw Diesel in exhaust says low compression, or bad injectors to me.

Does the 885 have the cold start screw on the injector pump like the 990? It's that little "T" screw on the bottom you turn and it alters the pump timing (I think). That will cause a lot of smoke and poor running. Can't say if it will cuase raw fuel to be ejected out the exhaust.

ivor from uk here and I have seen a David Brown 880 which was smoking bad and was caused by the cold start retard screw on the pump was open, when the screw was closed the problem was solved..

I did not read that this has been mentioned... if there are no copper washers then injectors are too far in cylinders causing incorrect injection... could the heater plug be leaking diesel and could this be caused by the ignition switch stuck in the heat position when running

Where is this cold start retard screw and what does it look like?

I don't see a heater plug. Where would it be? And if the ignition switch is stuck in the heater position, wouldn't just turning off the switch solve the problem?

Also, I wanted to ask you if the copper seals have to be of any particular size or type? The ones I put into the holes were not made for any particular engine. They are just generic ones from a kit. But again, they didn't make any difference.

I'm going to do a compression check but I hardly think that could be the problem because the tractor cranks without using starting fluid. Plus it ran great with plenty of power before the fuel lift pump stopped working.

I found the little T-screw you mentioned. The one on my 990 is not frozen, and I have never touched it during the 12 years or so that I have owned
this 990. But the T-screw on my 885 is frozen. I was unable to turn it so apparently it's been that way for ages so I doubt that that is the problem.
Today I cranked the 885, took turns loosening the 5/8" nuts that hold the fuel lines to the injectors, and discovered, as I suspected, that the rear-
most cylinder is not producing power. Cracking open that nut on the 2 injectors closest to the front of the tractor nearly killed the motor. But
cracking open the nut on the fuel line of the injector closest to the fuel tank made no difference in engine rpm's. So apparently I've got valve
problems.

Wouldn't be the first bent push rod I have seen in a DB. Quick, easy and cheap to check.

I cannot remember exact location of screw on pump.. but it is small thumb screw should be easy to find

The compression test indicated 430#, 450#, and 400#, starting with the front cylinder and working back.

When was the last time the valves were adjusted? Check that, and if you still have that much variation, do a "wet test" on the low cylinder, that is, put a tablespoon of oil in that cylinder then retest. If it comes up dramatically you probably have piston ring problems.