1970 190xt

Hello everyone!  I just joined the site and have enjoyed all the useful information on working on my 190 allis.  I have a few questions on mine.  I bought this 190 about 3 months ago and have been working out a few issues.  The motor sounds as though it has a miss and I'm not sure what route to go.  I think at times it sounds like a tick in the exhaust not running.  I already had the injectors rebuilt and the motor has cleaned up some, but in almost seems as though there's still a slight miss and the exhaust smoke seems to be more then needed (burns your eyes in a building).  I'm thinking the head may need rebuilt, but wanting your opinions.  Yesterday I ran it for awhile, and after shutting it down for the day I noticed black liquid coming out the exhaust manifold where the bolts had loosened up from the head.  Could also smell fuel.  The engine does have some blow-by, and do notice a drop of oil out of the tube occasionally.  I don't notice any change in fluid levels of antifreeze or oil. What are your thoughts?

Black liquid is probably unburned diesel fuel.  With blow by, there's a chance the one cylinder my not have enough compression.  It could be a stuck valve too.  Do you know how many hours the engine has on it?  There are rebuild kits available for a 301 engine, but there comes a time when you may need to tools to measure things like crankshaft wear.  It comes down to the big question: What do you want this tractor to become?  Show tractor or working tractor?

What else is wrong with the tractor?  Hydraulics good?  Pumps are not cheap.  Drive train ok?  Clutches, power director, rear end repairs just keep inching the cost of repairs higher. If I had an otherwise good tractor, I would rebuild the engine.This assumes that you have enough of a shop and tools to do the basic parts of the rebuild yourself.  You need a good hoist, for starters.  An engine stand would be needed too.  Expect to need to send the crankshaft out for regrinding.  You say the engine was rebuilt in the late '90s.  It should still be ok if that rebuild was done right.  If it was only an in-frame rebuild, you really don't know what you'll find when you open the engine up.

Edited by DougS - 04 Dec 2011 at 10:11pm

remove valve cover and check valve adjustments. sounds like a  exhaust valve with not enough lash on rocker, therefore holding it open slightly.

I did empty and clean both sediment bowls, changed fuel filter etc thinking it could be contamination.  As to good quality diesel fuel, you could be right as I get if from the local coop and there have been problems with water in the past.  I also replaced the primer pump to be on the safe side since they tend to leak.  The only fuel leakage on the entire tractor is a high pressure line at the injection pump on the bottom line.  Figured I'd replace the washers.  I didn't figure a drip from that line would effect any of my problems currently, maybe I'm wrong.  I think I'll pull the valve cover off this week and see what the current valve settings are and correct them.

Sounds like a valve problem to me.

I appreciate all the help!  I think its a valve problem also.  I've never adjusted the valves yet, so I figure I'd get them adjusted this week or weekend.  I think a compression check needs done as well.

Welcome to the forum schwanman66!