Well the head is off at the machine shop, awaiting it's turn in the jet cleaner, and bake oven. I oredered new intake valves, all new springs, and new guides. Decided to pull the pistons to better inspect them, and ran into a few snags.
First, I have been assuming thus tractor is a 300 utility, and thought it had a C169 motor. turns out it is a C175 motor. It is stamped right onto the block. So then I questioned if it might not be a 350 utility, then I found info that suggests they may have used C175 in the 300 near the end of the run. I had already ordered the valves, guides, and springs before realixing my error. :oops:Was mad at first, but then found the C169 and 175 share the same head:D
Problem now is to figure out exactly what piston/cylinder this motor uses. I found on the IH site they list only one number for the C175, but when crossing to a Clevite/Mahle number, they list 2 differant ones based on serial #.
The tops of the pistons I have are the "firecrater" style, but I think the differance might be in the wrist pin diameter.
Went to pull the oil pan, and get this, it won't clear the large support arm that comes from the front axle towards the rear.:censored:
Do I actually have to remove the front axle assembly to get the oil pan off:confused:
Here is another weird thing. What I can see for serial numbers does not coincide with what the online parts manual says I should be seeing.
The manual states all 300u engine serial numbers start with 9501 with a c169 prefix, and 350u engine numbers start with a 501, and a c175 prefix. My engine serial number appears to be 3615?2, the ? looks like either a 5 or a 6. This number is stamped into the block in a flat area just above where it is embossed C-175. Also below where the firing order is embossed, there are numbers seperated by little screw heads *3*17*0*.
The tractor serial # on a tag on the clutch housing is also not making much sense to me.
The parts manual says the chassis serial numbers for both the 300 and 350 should start with 501, but mine appears to be 18267, then a long space followed by a letter R. The suffix codes in the manual say the R would designate a tractor with Torque amplifier attachment, and if mine has a TA, great, but why is it missing the lever?
I'll post part 5 of the video soon.