if the oil smells of fuel or is thin dont run it. fix the pump and give it a oil change. thinned out oil will destroy the bearings due to poor lubrication.

Fieldchief5U wrote:

I'm going to put a new thermostat in the ol girl today, and I'll flush the cooling system. The bottom hose is always cold, top of the radiator is hot after work, but you can hold your hand on it. Need to get the temperature gauge working, fixed the fuel pressure gauge the other day, needle was gummed up. Hopefully the slobbering goes away. One other question I have, what sort of fuel consumption is normal for a D2? I've only done 3 hours work on a full tank, and it's only got half a tank left. Thanks for the responses 

If you can hold your hand on the radiator, it is only 120 degrees or so. That is way to cold to be running a diesel engine at. They will slobber alot at that temp. They need to be close to 180 degrees to have proper combustion.
 

Hi, Fieldchief5U.
Sounds to me like you're leaking more fuel than you're burning, problem being knowing where it is going. Like TK88 said, if it's going into your engine oil, that will KILLL your engine.

If my understanding is 'kee-wrecked', fuel can also get into your engine oil from the injector pump itself. Might be time to have that serviced and replace the seal between the filter tower and the injector pump. Also, make sure that the bleed screw on top of the filter is closing properly. While you have it apart, try blowing back through the drain pipe. If you can get air past the bleed screw while it is closed, it's not closing off properly.

Just my 0.02.

Fieldchief5U wrote:

Okay, just joined ACMOC, and here goes. Picked up a very tidy D2, 5U series in exchange for some excavation work, has 8417 hours, and starts and runs beautifully. It hardly smokes at all, maybe a wee bit of blue haze. But the exhaust slobber is terrible, there's wet black oil all inside the exhaust, and spatters everywhere when its working hard. It has decent compression, doesn't take long on the pony to get it to fire up. Top of the radiator is quite hot when running, but the bottom hose is always cold. Does it just need to run hotter, or could it have glazed bores or something? Any advice on how to fix this wet stacking would be great. This is my first Caterpillar, so any advice on where to get filters and parts would also be appreciated.
cheers from New Zealand.

Welcome! I'm a fellow NZ member with a D2 5U which is prone to wet stacking! Where are you based? I'm in Nelson

I had a wet stack problem also. I found that I had a blown gasket in the top of my fuel tower.

The oil seems pretty clean and the level is all good. Smells just like any other used diesel oil I've seen. I might drain a little bit just to see that it's not too runny. On Monday we'll be going into our caterpillar dealer to see if we can get the packing seals for the transfer pump. The end of the drain tube was wet I noticed. It's just a toy of ours, so it can sit around as long as it needs to. I'm located near Dunedin. I think it needs new fuel filters as well. I might just take the fuel tower off and go over it and replace all the seals. Have ordered a new temperature gauge with the right 5/8 thread on the end because the old one was dead. The fuel level stays the same unless it's running. Edit: The packing seal on the pump side of the transfer pump was definitely gone, took it out today. If I can't get these seals from Cat, I'll machine a bush for the shaft and put a modern rubber seal in.
Cheers.