Knock

[cas1954]

Have a far pro 2425 that developed a nasty knock. I drained the oil thick but had a bit of a shine so I continued. Stripped ending down to pistons haven't found anything that stands out. Not sure what to do next? Tractor only has 80 hours

 

[Don87]

Knocking is usually indicative of a 'lower end' problem, as in rod bearings.

Unsure what you mean by thick oil, but a bit of a shine...........do you mean metal shavings in the oil?

If you remove the bearing caps from the rods and mains, be sure to mark them as to where they went
.

 

[Soundguy]

have any bearing caps turned color? ( bluish)

any show signs of a spun shell?

 

[cas1954]

What do you mean by spun shell?

 

[Soundguy]

bearing shell.. IE.. spun bearing...

if you are not familair with these terms.. ...might be the time to take it to someone who's worked on an engine before and get some help with it.

that and a service manual.. should make short work of the diagnosis and subsequent repair.

soundguy

 

[cas1954]

Is there a possibility of an injector causing this problem as in what some refer to as a fuel knock?

 

[Don87]

Is there a possibility of an injector causing this problem as in what some refer to as a fuel knock?

post nimber 2

EDIT: Considering the way you described the knock, I would take the oil pan off and check the rod and main bearings. You claim to have the top end apart already, and everything there looks good.

I realize the tractor only has 80 hours on it, but the knock can ruin your year in a hurry if a rod comes loose and goes thru the block.

I'm sure I've seen threads here on TBN about Farm Pro tractors coming apart with low hours.

 

[cas1954]

I also have all pistons out and all bushings on connecting rods are just like new.

 

[cas1954]

No play in wrist pins

 

[Mark Page]

Even low hours don't mean all was well from the factory. I had a similar problem with 1233 Massey. They replaced all the bearings and the problem went away. I've also seen, what looked to be, a relatively new Kubota with a shattered piston and broken rod hanging out of the block.
If it only has 80 hours on it the factory warranty should be in effect.

 

[Don87]

You need to get a job at a dealership. In two hours you dropped the pan and pulled the pistons.:thumbsup:

Not sure what to tell you now, with the sound you said it was making what you should have found was loose cap nuts on a connecting rod on an 80 hour machine thats knocking.

 

[RoyJackson]

I also have all pistons out and all bushings on connecting rods are just like new.

At this point, since you have the engine pretty much torn down, I suggest you check the main bearing clearances with Plasti-Gage (Genuine Plastigauge - How It Works)

With 80 hours...well, I'd have had the dealer sort it out...you disassembling the engine could have voided any warranty you may have.
Assuming the engine was assembled with all new components, it appears there may be an assembly problem (that can be a big problem with Chinese made equipment).

Anyway, check the mains with that plasti-gage. I hope you have a manual so you know what the clearances should be.

 

[Don87]

Another little tip:

Never ever start 2 different threads on the same problem, several weeks apart. It makes it impossible to follow, and to give accurate advice.

You still have not answered some questions from the first thread as well as this new one.

 

[Don87]

At this point, since you have the engine pretty much torn down, I suggest you check the main bearing clearances with Plasti-Gage (Genuine Plastigauge - How It Works)

With 80 hours...well, I'd have had the dealer sort it out...you disassembling the engine could have voided any warranty you may have.Assuming the engine was assembled with all new components, it appears there may be an assembly problem (that can be a big problem with Chinese made equipment).

Anyway, check the mains with that plasti-gage. I hope you have a manual so you know what the clearances should be.

According to the first thread he started there is no warranty on his tractor:


http://www.tractorbynet.com/forums/parts-repairs/232258-knock.html


I found the first thread after doing a 'farm pro'search.

 

[RoyJackson]

According to the first thread he started there is no warranty on his tractor:


http://www.tractorbynet.com/forums/parts-repairs/232258-knock.html


I found the first thread after doing a 'farm pro'search.

He's screwed...

Thanks for the link!

 

[Don87]

He's screwed...

Thanks for the link!

He sure is.

He never answered the question about knocking location using the broom handle, nor the question of metal in the oil using a white piece of paper. I also asked in this thread about the 'shiny oil'.


It really makes things difficult when trying to help from several hundred miles away, on a computer.

 

[Don87]

But at the very least, I would replace all the bearings, rod and main( like Mark Page suggested), but only after following Roy's instructions.

I have to leave for work in 15 minutes, I won't be able to help anymore til next weekend when I get back from trucking. The guys in here will help, just please, do not start any new threads on this subject. Use this thread since I've linked the 2 threads togerher.


Best of luck, and keep us posted on your progress.

 

[cas1954]

No warrenty

 

[cas1954]

Just cut the oil filter apart didn't find any foreign material

 

[cas1954]

Used a stethoscope could not pinpoint any specific area of the knock slightly focused toward cylinder closest to the rear , but nothing jumped out.