1977 John Deere 4630 - picked it up about a year ago just shy of 11,000 hours for pretty cheap - had bad tires, oil pump seal was out, broken window, fuel tank leaked, and it had wiring troubles. The guy I bought it from ran it hard and put it away wet but I could tell the guy he bought it from (original owner) took meticulous care of it. So I drug it home, found some tires for it, fixed the oil pump seal (turns out the pump had been replaced at some point - had a serial tag on it), welded up the fuel tank, put a window in it, and just generally dinged it up. Used it all last summer on one of our big balers and it ran without a problem. Used less than a half quart of oil in it's 300 hour oil change and has minimal blow by. Couldn't be happier with it.
That being said, it starts like a bad starting 30 series John Deere. Injection pump and injectors were replaced at about 10,000 hours. So far I have upgraded the starting system and am using the manual destroke valve.
Last night it was 20° F and it has been in the low 40's all day. Went to start it after lunch without being plugged in just to see how it would act. I cranked and cranked and cranked and it would never even hit. Gave it a snort of ether and it fired right up.
What is it about these 30 series? Some are reported to start like a champ but we have had 3 4430's and 2 4630's and they all have to have ether below 50° F.
On our 4430's we finally got smart and put a grid heater off a Dodge pickup on them. Can't do that with the intercooler on the 4630 though.
Short of rebuilding it with higher compression pistons and getting the injection pump and injectors worked over to 4555 specs, is there anything I can do to make it start better?
Here's a picture of the ether hooker: