1175 engine question

[John Achmann]

Guy brought me an 1175 for some repairs. He said he
overhauled the engine around 200 hours ago. He did the
work himself. Not a mechanic but knows that stuff needs
to be clean and torqued. So ever sense the overhaul the
tractor had a ticking sound that sometimes is a knocking
sound. He asked if I could figure out that problem. So
tore into the engine. Heads had to come off anyway as
the gasket leaked antifreeze externally. I looked over
everything as it came apart. Pulled pan checked
everything over on lower end. Made the decision to pull
pistons as Im right there and wouldnt take long. Cleaned
everything and didnt really find anything that sticks out.
Heres my question, as Ive pulled pistons and kinda plan
to reuse the rings should I hone the cylinders a little and
reassemble? Dont hone and reassemble? What would
you guys do? Dont really want to replace the rings as
these look ok. Ive had different opinions over the last 25
years of being a mechanic on issues like this.

 

[kris Jensen]

I would give it a light honing with apiece of emery cloth or sandpaper
using my hands on the paper. Just enough to scuff it lightly.
If it were making a ticking, or knocking noise and all you have done looks good,
there is another problem that needs to be found.
Kris

 

[wore out]

Did you have wrist pin fit and connecting rod straightness professionally checked?

 

[John Achmann]

Wrist pins feel good. I dont think he had rods checked for straightness. Im not totally done cleaning and inspecting also.

 

[John Achmann]

Never thought to just break the glaze by hand with emery paper. Ive got a little more to clean and inspect. It kinda stinks when you try to find a problem from someone else work.

 

[J Hamilton]

Do you know if he had the heads rebuilt? Or grind the valves? Or did nothing to them?

 

[John Achmann]

Yes that was all taken care of.

 

[John Saeli]

John: A faulty injector will causer a knock.

 

[casecollectorsc]

I've used a ball hone and de-glazed the sleeves and had good results. Are the pistons in the right way? Found that on an engine once...pistons are cut to clear the valves and one was in backward.

 

[wore out]

(quoted from post at 11:29:27 03/08/22) Wrist pins feel good. I dont think he had rods checked for straightness. Im not totally done cleaning and inspecting also.

A bent or twisted rod (not enough to see by "eyeballing it") can cause strange noises.

 

[nick831]

A light hone will just insure the rings will seat properly. Either a bead home or emery paper as one person said above. Also I have witnessed the bad injector knock as John said, a 3208 Cat. It resembles a rod bearing. Too much diesel and it honestly sounded like the motor was going to detonate. Also consider plasti gage the bearings on the lower end? While it's apart? Hope you get it fixed. Nick

 

[olgentdc]

that has my vote .. check the thrust washer clearance also ..