3406A liners

[92U 3406]

How tight should the liners sit in the block with no lower liner seals? 92U PCTA Cat 3406.

 

[Cmark]

Slip fit.

 

[92U 3406]

Perfect. The old ones took a good 5-6 ton to remove. Was a little concerned when the new ones went in like nothing.

 

[92U 3406]

I assume the liner is held tight and in place by the lower seals/filler band and on top by the crush due to liner protrusion?

 

[Truck Shop]

Correct!

 

[92U 3406]

Awesome! Just wanted to be sure it was all good before I put the liner seals on and drop the pistons in.

Thanks ya'll. Merry Christmas!

 

[Cmark]

Lube the liner seals with soap or something non-oily. Soak the filler band in engine oil, fit it to the liner and install the liner immediately. Clamp the liner down because the filler band will begin to expand.

 

[Nige]

Lube the liner seals with soap or something non-oily. Soak the filler band in engine oil, fit it to the liner and install the liner immediately. Clamp the liner down because the filler band will begin to expand.

And that, boys & girls, is why it took 5-6 tons to press the old ones out where the replacements simply drop in. You won't move them by hand once the filler band has expanded.

Cmark pretty much quoted the Service Manual word for word ........... "Put liquid soap on the O-ring seals and on the cylinder bores. Put filler band (2) in SAE 30W oil. Then immediately install the filler band on the cylinder liner and immediately install the cylinder liner in the cylinder block with tooling (C) before expansion of the band."

 

[92U 3406]

Thanks again guys.

I've read the procedure a few times. I haven't done an engine rebuild before so just didn't know if it was normal for the liners to just drop in by hand. I had no idea that the filler band expanded and put that much force on the liner.

 

[Truck Shop]

And years of contaminants collecting on the seals and band (on Cummins it's called a crevice seal}. But one thing if your installing complete Cat piston liner packs {remove the yellow liner plug/cover
and carefully pull the rod and piston assembly down to where you can see the wrist pin and check that the snap ring that retains the wrist pin is in it's bore-fully locked} I always check those because
the shop I was working in years ago that item wasn't checked on a B model inframe-wrist pin slid into cylinder wall-it had 30 minutes run time. Cummins I use vegtable oil, Cat I use Sil Glyde on the
bottom seals and bottom bore and oil on filler band.

 

[92U 3406]

Here's the project. Turning a W900A daycab into an RV hauler.

 

[Truck Shop]

I always liked those white putty cat engines.

 

[92U 3406]

CAT Power Module White. Paccar white wasn't bright enough for me.

 

[kshansen]

Here's the project. Turning a W900A daycab into an RV hauler.View attachment 207428

92U 3406, you really need to clean that block up better I think I see a fingerprint between those two studs sticking out the front!

And tell me you are going to touch up those scratches circled in red:

 

[92U 3406]

92U 3406, you really need to clean that block up better I think I see a fingerprint between those two studs sticking out the front!

Lol I think that's just the boss the fan hub adjustment bolt sits in.

 

[92U 3406]

Lol yep it'll be getting repainted once assembled. Just wanted to get the block covered before bolting all the accessories onto it. Kinda hard to get paint behind the fuel pump and compressor lol.

 

[Cmark]

And that, boys & girls, is why it took 5-6 tons to press the old ones out where the replacements simply drop in. You won't move them by hand once the filler band has expanded.

Cmark pretty much quoted the Service Manual word for word ........... "Put liquid soap on the O-ring seals and on the cylinder bores. Put filler band (2) in SAE 30W oil. Then immediately install the filler band on the cylinder liner and immediately install the cylinder liner in the cylinder block with tooling (C) before expansion of the band."

Lord alone knows how many engines I've rebuilt over the years, but I would say that well over half of them have been 3400 series.

 

[Cmark]

I don't know how far you have gone with the block overhaul but I would advise you to check liner protrusions before final assembly.

 

[92U 3406]

0.004" across the board. I found a bad spot on the spacer plate I missed during inspection after I checked. Putting assembly on hold until I get a new one. Then will re-check again with the new plate on.

 

[Cmark]

I'm guessing you have a copy of the D&A? It's important to clamp down the liner and spacer plate before measuring.