My New/Old 240D

[bowinelk]

The old 240 I got. Ive been trying to get started with no success. I replaced 1 injector. fuel systems been flushed with new fuel and filter. Lines have been bled of air up to the injectors. I cannot get it to fire off. Need some more tips or help diagnosing. Is there a way to check timing? Or could the intake be getting to much air? Would that make a difference? Looks like a gray smoke coming out the exhaust? It has compression, not sure how high of compression but has very noticable change when decompression lever is pulled.

 

[winston1]

Did this problem come on suddenly or has it sort of crept up on you? Any work been done on it lately besides injector change and filter? No reason for the timing to change unless injector pump has been removed. Impossible to get to much air. Is your battery good and getting good rpms when engaging the starter with compression release pulled? Diesels like rapid rotation in order to crank properly. Don't know the weather where you are but if 40 degrees or colder are you using the thermostart? Does the tractor have much blowby?

 

[normde2001]

Is the fuel pump pumping?

 

[bowinelk]

Pump is pumping. The problem as far as when it started, I'm not sure I just acquired the tractor. It has been parked a while. The guy I got it from said if water coming out the exhaust before it went down. He assumed head gasket. My goal was to see if I could get it to run and see for my self what may be wrong.

 

[bowinelk]

As far as blowby. What would be a good indicator of checking how bad that is?

 

[bowinelk]

Not slowly I meant blowby

 

[winston1]

You would need it cranked to determine blow by. Here is a video showing excessive. Do you have any water in the oil? Milky looking? If the head gasket is leaking you wouldn't want to run it much before repairing. Might want to remove radiator cap, roll engine over without pulling compression release and see if you get bubbles in the radiator. If you do your head gasket is most likely leaking. If it is leaking badly it probably won't turn over without pulling the compression release because of water on top of pistons. YouTube - Yanmar 155D Crankcase Vent

 

[bowinelk]

Well I haven't checked the vent while cranking but do get some blowback through intake and valve cover ports

 

[normde2001]

Well I haven't checked the vent while cranking but do get some blowback through intake and valve cover ports

Do you mean as if the intake valves weren't closing?(.006") clearance.

 

[bowinelk]

Well I'm not sure but could see some smoke pushing out the intake. I was wondering same thing if possibly intake valve not sealing. So you think I need to take valve cover off and see if valves are operating and check clearances?

 

[California]

Smoke in the intake could also be the ThermoStart (manifold heater) working normally while the key is turned. There is a description on Hoyetractor's website.

 

[winston1]

I don't suppose that would be to big of a job and would define whether it is a valve problem. What bothers me is the report from the former owner of possible water coming out exhaust. Still think it would be worth your while to roll the engine over with compression release left alone and observe radiator for bubbles.

 

[bowinelk]

So if i am getting blowby, what are possible causes? Rings?

 

[normde2001]

So if i am getting blowby, what are possible causes? Rings?

Why do you think you are getting blowby? The engine does not run.

 

[bowinelk]

When cranking it I am getting some venting from the block. Not much. Which may be normal, I'm not sure

 

[bowinelk]

After watching California's video of his 240 starting. I realized I dont think I had near his compression. But any way I new I had a bad head gasket at least. So I went ahead and pulled the head off. Head gasket looked ok, but I did find crack in the head between the exhaust and intake valves. It explains why some pressure was coming out the intake.
Any thoughts on possible repair of this or replace head? Hopefully you can see picture. Hoyes has new bare head for about 600 or loaded head with new valves and springs 733. Most of my equipment looks in good shape. Should I go with loaded or bare

 

[careyo63]

I would take it to a local machine shop. Can't be certain just by the crack showing in the Pic. if thats all of it. Should be repairable and they can go through the valves while there at it.

Carey

 

[normde2001]

It appears that crack extends through both valve seats and beyond the exhaust valve, probably not worth trying to repair. I believe I would try to return the tractor or sell for parts, and get a running tractor. You are going to have about $1000, plus whatever you paid for it in a still non-running tractor, of unknown condition.

 

[Gary Sweat]

After watching California's video of his 240 starting. I realized I dont think I had near his compression. But any way I new I had a bad head gasket at least. So I went ahead and pulled the head off. Head gasket looked ok, but I did find crack in the head between the exhaust and intake valves. It explains why some pressure was coming out the intake.
Any thoughts on possible repair of this or replace head? Hopefully you can see picture. Hoyes has new bare head for about 600 or loaded head with new valves and springs 733. Most of my equipment looks in good shape. Should I go with loaded or bare

If the tractor as a whole is in good condition I would replace the head with the "complete" assembly. If it has been run for very long with the crack there's a good chance the valves may have started to burn at the crack. It would be a good idea to pull the oil pan before you buy the head and look at the rods to make sure one is not slightly bent. I doubt that has happened but check it to be sure. The crack could have been caused from overheating or a fluid lock. Diesels are pretty tough engines and you may just need a head.

 

[winston1]

If going as far as pulling pan I would re ring. You really have an unknown here. Spending $500 or whatever is a lot not to go ahead spend a little more for rings. If you put a new head and end up with blow by you are going to be awfully disappointed.