Hydrolocked New Holland TC35D

[CoveyBruce]

Hey all,
I'm having some problems with my New Holland TC35D tractor. So you know what I've done with it and what's going on I'll tell the whole story

About a week ago I noticed that diesel was leaking from around the injector pumps on the engine. I thought nothing of it and ordered new seals for all the IP's. (100 bucks for 9 seals!)
Anyways a couple days ago I received the seals, so I went out to get the tractor and bring it up to the shop so I could work on it and get them replaced. Well what do you know, it doesn't start, wont turn over but the starter's still engaging and trying to turn it.
My first thought was that it had seized up or some water had gotten in it and rusted it, so I took a pipe wrench to it. I got it to move about a 1/4 of a turn but that was it. (I'm hoping that this wasn't a big mistake)
Well, when that didn't work I decided I better start taking it apart. The first thing I started to take off was the exhaust outlet on the side of the engine, I knew something was wrong when it started to leak diesel, and when I took it off out came a cup or two of it.
I did some research and found out that it was probably hydrolocked with diesel. By now I had already taking off the cover to the valve arms, the air inlet, exhaust, and injector pump assembly.
So next I took out the injectors and tried the engine. Diesel shot out ten feet, literally.
So after turning it over plenty to get all the diesel out of it, and replacing the oil, I put everything back together.
Also in all of this I replaced the seals in the injector pumps. I'm hoping that these seals were the culprit for all that diesel.
So I got everything back together and tried to start it. It starts, but there's a loud knocking sound coming from the engine. After doing some more research, I learn that this might just be something with the injectors, so I take them all out and clean them again. Now the knocking is much quieter, but it's still there, and it gets louder when I turn up the throttle. It's also blowing a light blue smoke out the exhaust.

I've heard that his might mean that it needs new injectors, or maybe the the timing for the injector pumps is off. Could I have messed something up when I replaced the seals? I only took out what I needed to get to the seals, nothing extra.
Or could it be that I bent the piston rods by trying to turn it with a wrench?
Also do you think that the bad seals in the injector pumps are what caused the problem in the first place?

What do you guys think?
Did I explain everything enough?

Thanks in advance! Stuart

 

[CoveyBruce]

Hey all,
I'm having some problems with my New Holland TC35D tractor. So you know what I've done with it and what's going on I'll tell the whole story

About a week ago I noticed that diesel was leaking from around the injector pumps on the engine. I thought nothing of it and ordered new seals for all the IP's. (100 bucks for 9 seals!)
Anyways a couple days ago I received the seals, so I went out to get the tractor and bring it up to the shop so I could work on it and get them replaced. Well what do you know, it doesn't start, wont turn over but the starter's still engaging and trying to turn it.
My first thought was that it had seized up or some water had gotten in it and rusted it, so I took a pipe wrench to it. I got it to move about a 1/4 of a turn but that was it. (I'm hoping that this wasn't a big mistake)
Well, when that didn't work I decided I better start taking it apart. The first thing I started to take off was the exhaust outlet on the side of the engine, I knew something was wrong when it started to leak diesel, and when I took it off out came a cup or two of it.
I did some research and found out that it was probably hydrolocked with diesel. By now I had already taking off the cover to the valve arms, the air inlet, exhaust, and injector pump assembly.
So next I took out the injectors and tried the engine. Diesel shot out ten feet, literally.
So after turning it over plenty to get all the diesel out of it, and replacing the oil, I put everything back together.
Also in all of this I replaced the seals in the injector pumps. I'm hoping that these seals were the culprit for all that diesel.
So I got everything back together and tried to start it. It starts, but there's a loud knocking sound coming from the engine. After doing some more research, I learn that this might just be something with the injectors, so I take them all out and clean them again. Now the knocking is much quieter, but it's still there, and it gets louder when I turn up the throttle. It's also blowing a light blue smoke out the exhaust.

I've heard that his might mean that it needs new injectors, or maybe the the timing for the injector pumps is off. Could I have messed something up when I replaced the seals? I only took out what I needed to get to the seals, nothing extra.
Or could it be that I bent the piston rods by trying to turn it with a wrench?
Also do you think that the bad seals in the injector pumps are what caused the problem in the first place?

What do you guys think?
Did I explain everything enough?

Thanks in advance! Stuart

 

[CoveyBruce]

I reposted this in the general tractor repair section. The links below.
http://www.tractorbynet.com/forums/...ydrolocked-new-holland-tc35d.html#post4115524

 

[RDrancher]

No way you could bend rods turning the engine over with a wrench, so you can rule that one out. It sounds like you either have an injector stuck open or the seal between the injector pump and crankcase is bad. Both can fill the crankcase full of diesel. Did you bleed the system at the pump and then at the injectors before you tried to restart it?

 

[CoveyBruce]

No way you could bend rods turning the engine over with a wrench, so you can rule that one out. It sounds like you either have an injector stuck open or the seal between the injector pump and crankcase is bad. Both can fill the crankcase full of diesel. Did you bleed the system at the pump and then at the injectors before you tried to restart it?

Alright, I wasn't sure if it would be possible to bend the rods by hand.
The seal around the injector pump assembly and the crankcase looked good and clean when I took it out, don't know if that says anything.
Are you supposed to replace injectors after so many hours? I know that the original ones are still in it, and the tractor has a good amount of hours on it. I'll have to check in the morning.

And yes, I did bleed the lines before trying to start it.

 

[RDrancher]

Mine is at 3000 hrs with the original injectors. I did have the pump rebuilt, but it was for o-rings leaking externally.

I know that it will make a bunch of racket on restart if it runs out of fuel. It takes a few minutes at idle to straighten itself out.

 

[GManBart]

Does the knocking vary with rpm? If it does, does it seem to be at engine speed, or a slower rpm?

 

[RDrancher]

Gman, the OP has another thread going here http://www.tractorbynet.com/forums/new-holland-ag-tractors/335716-hydrolocked-new-holland-tc35d.html. If we can keep the comments over on the other thread there will be less for the mods to clean up.

 

[CoveyBruce]

Gman, the OP has another thread going here http://www.tractorbynet.com/forums/new-holland-ag-tractors/335716-hydrolocked-new-holland-tc35d.html. If we can keep the comments over on the other thread there will be less for the mods to clean up.

Sorry about that!

GMan - It does vary with the rpm. It's there all the time just quieter in low rmp and louder in higher. It stays consistent with the engine, faster with faster engine speed and slower with slower engine speed.

 

[CoveyBruce]

Mine is at 3000 hrs with the original injectors. I did have the pump rebuilt, but it was for o-rings leaking externally.

I know that it will make a bunch of racket on restart if it runs out of fuel. It takes a few minutes at idle to straighten itself out.

Ok, I'm guessing mine is around there. I might go ahead and replace the injectors just because.
I'm guessing those are the same o-rings I replaced on the pumps. They were leaking around the individual pumps that come out of the pump assembly part.

I ran it for a good 5 to 10 minutes and nothing changed, if anything the blue smoke got a slightly darker, still pretty light though.
I'm familiar with running out of fuel, and this is definitely not that.

I should also mention that when the engine is running at high rpms, it is a very loud knock. There's no way you could miss it standing a 100 yards away.
At slower rpm it's less noticeable, but it's still there.