leaky injectors 743

[qball 743]

bobcat 743 fuel injectors leaking

 

[antfarmer2]

Are you sure it's not the bleeder valve

 

[SkidRoe]

I take it that you mean externally? Likely cracked or loose return lines. Had the same problem with the 773, all of the return line nuts had backed off. HTH

 

[antfarmer2]

I take it that you mean externally? Likely cracked or loose return lines. Had the same problem with the 773, all of the return line nuts had backed off. HTH

Yes and the 743 just has rubber lines with clips

 

[qball 743]

Yes and the 743 just has rubber lines with clips

it's bubbling fuel at the base of all the injectors where it screws into at the head

 

[SkidRoe]

it's bubbling fuel at the base of all the injectors where it screws into at the head

Sounds like the seal washers are shot. How many hours are on the machine?

 

[qball 743]

it's bubbling fuel at the base of all the injectors where it screws into at the head

3538.8 hrs

 

[SkidRoe]

3538.8 hrs

Just thinking that while you had the injectors out to put new seal washers on, you may want to take them in to a diesel shop and have them tested.
That is not a lot of hours, but the machine is likely over 25 years old.
FWIW.

 

[qball 743]

Just thinking that while you had the injectors out to put new seal washers on, you may want to take them in to a diesel shop and have them tested.
That is not a lot of hours, but the machine is likely over 25 years old.
FWIW.

Can I get those seal washers at napa, or do I have to get them from bobcat? Are they Brass washers, or copper ???

 

[Tazza]

Can I get those seal washers at napa, or do I have to get them from bobcat? Are they Brass washers, or copper ???

Had the exact same issue with a 743 i bought. The copper washers under two injectors had grooves burnt in them from the exhaust gas escaping past the injector and washer.
Napa may have them, if not i diesel injection shop will have them.
When you go to replace them, ensure you give the injector hole a good scrape out of all carbon so it seats correctly. I have installed a rubber cap in the injector hole and scraped the hole with a screwdriver and i used an oring pick to scrape out the threads. I used compressed air to blow the loose crud out but be careful not tp push the cap into the cylinder.