Colt Case Ingersoll Garden Tractors

This summer a 646bh with a ccka engine was purchased. The engine was missing a lot of components but thanks to Boomer, that problem was taken care of. The biggest surprise was pulling the flywheel and not seeing an armature.
Plans were to have the engine back on the tractor by last fall, well here it still sits on the back bench.
I love it when a good plan comes together. It just doesn't happen often enough.

Eugene

Hi Eugene! I for one am looking forward to your restoration through which I will live vicariously. What do you think, should we perhaps create a Restorations forum subject?

I do want to expand on the subjects, as the current ones I created in hurry to have a starting point.

I'm looking forward to seeing your restore Spike. I have a 1977 646 with loader and rototiller.
Keep the Peace
Harry

Harry, You know me from the other site,

Eugene (not to be confused with Eugen even though he is the best)

Eugen wrote: ↑Sun Mar 07, 2021 1:30 pm Hi Eugene! I for one am looking forward to your restoration through which I will live vicariously. What do you think, should we perhaps create a Restorations forum subject?

I do want to expand on the subjects, as the current ones I created in hurry to have a starting point.

Restoration as a forum subject makes sense.

I will put the Backhoe restoration under it when created.

Eugene

Following the Onan service manual steps for engine assembly, the main and cam bearings were the first to be installed in the block. The bearings were placed in the freezer next to the ice cream during an off site service call. You know a person is stoked when the engine rebuild took precedence over ice cream. Not only were the bearings installed but the pistons also.

With the main bearings in place the crankshaft and thrust bearings were installed.
The first crankshaft backlash check with the gage came out at around 0.027". The range was to be 0.006" to 0.012". After a moment of panic and a bit of thought, it became obvious why Boomer had sent 2 rear bearing plate gaskets. One measured 0.018" and the other was 0.009" thick. Switching to the thinner gasket brought the backlash down to 0.012 which was ok but not acceptable. Having a roll of 0.005" steel shim stock, there was a "why not try it" moment, the manual does recommend shimming.
A 2" id shim was quickly cut with a new box knife blade
and the final measurement was just over 0.006". That backlash will be good for the life of the engine.

Now the trusty feeler gage moves on to the next step. Fitting the rings.
The original pistons were worn to the point that the rings could be seen between the piston and cylinder wall. Once again Boomer Influence came into play. When ordering pistons he recommended 0.020" oversize. It turned out to be a good call because there is a very small rust pit in one of the cylinders, likely caused be water sitting in it at some time.
A piston was used to punch the new rings perpendicular to the bore.
The spec's for ring gap is 0.010" and the rings were a perfect fit with no modification needed.
With the 0.020 oversized pistons installed in the fresh bore, things are looking good.




It feel good to have this project moving forward again.

Niiice!

Questions:

Did you have the valve seats done too?

Was the crankshaft ground to the next smaller size?

How did you orient the ring gaps, in any particular way or random?

Eugen

The crank was good so it went back with STD bearings. Top 2 rings are gapped 180 degrees and parallel to the crank shaft. Oil rings are at 90 degrees to the crank. I will be doing new guides and valves and lapping the seats.

Spike

Spike188 wrote: ↑Thu Apr 29, 2021 10:38 am Eugen

The crank was good so it went back with STD bearings. Top 2 rings are gapped 180 degrees and parallel to the crank shaft. Oil rings are at 90 degrees to the crank. I will be doing new guides and valves and lapping the seats.

Spike

Oh, new guides! The old guides were out of spec I guess. I'm a little intimidated by the guides replacement procedure, worry that I mess everything up real good if I try to take the old ones out on my k321. I'm not sure either if they're ok, don't have the right gauges to measure them

Regarding the oil rings, do you take the thrust side of the piston into consideration at all? I don't have experience with this, so I go by what I read on the world wide webs

I did take the Onan wear patterns into consideration for all of the rings. Others may have input on the best layout of the rings.

Spike

Another setback this morning. This motor had an "what did they do that for" point box on it. The stator was also missing but the engine was running it you had a charged battery.
With what is know about this engines history and the overall condition of the 646B it came from, cam condition should have been expected.
The points lobe had galling on the lead in of the cam on both sides. My first though was remove the points and change over to electronic ignition. Further inspection of the other lobes reveled a slight imperfection on the back side of on lobe. Well there goes the dream of finishing it this week. Can you say Debbie Downer?

A month ago when the 4118AH was purchased there were some Onan's in the weeds.
This one not only has a good cam, but also a few other parts that will be useful.

Never look a gift horse in the mouth.

Spike.

The donner camshaft is from a JD 318, and a newer series of engines. The lobe lifts are a lot higher than the CCKA cams. The options now are finding a good camshaft or using the old one with electronic ignition.

Any suggestion?

Spike

If the profile of the lobe is mostly the shape it should have and only local parts are pitted or gauged, would it not be possible to fill in with some welding and file it back into a smooth finish of the right shape? I would not do that to the valve cam lobes, but the points shaft doesn't put a lot of pressure on the lobe.

Boomer to the rescue! He shipped me a NOS cam, intake valve and guide today. Now the pistons and crank will come back out to have the valve and seat ground.



Spike

Spike188 wrote: ↑Tue May 04, 2021 5:40 pm Boomer to the rescue! He shipped me a NOS cam, intake valve and guide today. Now the pistons and crank will come back out to have the valve and seat ground.



Spike

That is good news Spike! What are you cutting the valve seats with? I ordered a tool from India 3 months ago and it never came

I had mine done by Mike.