Ordering 4630 overhaul parts today. suggestions?

Hey all,
Just bough another 4630 to help out with work around the ranch, so by the time it gets here I hope to have the parts together to overhaul the 4630 I already have. this poor engine was worked hard when we got her with approx 12-14000 hours on the clock, and I've easily put another 1000 on it since then. The blowby is getting bad enough now that it blew the front seal out last fall, the rear seal out this spring (soaking the clutch) and now it's pushing out out through the timing cover gasket.

I feel it's time to do a major inframe.

The previous owner told me that they put a new cam in it at about 8000 hours, so I don't think I'll be touching that.

I can get a major inframe kit with the front cover gasket for $1450 with hi comp pistons.

Deere tells me they cant get the hi comp pistons, and their overhaul kit is $1750 plus I'll need to buy a timing cover gasket.

Anyone have thoughts on which kit I should go with? or maybe a different one?

Should I replace the oil pump regardless at this high of hours?

I'm assuming my head will need new valves if it's not cracked, but if the head is no good, do I replace it with a JD head, aftermarket casting, or will a 466 head swap to the 404 and give me better efficiency?

Any thoughts on this before I get the parts coming is greatly appreciated!

DF
 

When I overhauled my 4010 I used a kit similar to this

http://www.agkits.com/John-Deere-404-Turbo-Diesel-Late-Engine-Rebuild-Kit.aspx#.VAXEclYm_Kc

I liked it a lot and it came with all the bearings, gaskets, head and rod bolts etc.
However, there are many on this board who do much more overhauling than I do.
 

Have you looked at the OH kit's on this site(YT)?
mvphoto10658.jpg
 
"rear seal out this spring (soaking the clutch) and now it"s pushing out out through the timing cover gasket"

Your confusing me a bit,,the clutch issue could mean it"s a power Shift, but the "timing cover" I"m not sure of,,but going on with details,,use the raised numbers behind the cover to get the correct kit, be sure you have the head re-done, I always replace the springs and at least the exhaust valves/seats,,replace the rod pin bushings and have the rods re-sized, this makes sure that the new bearings fit nice into the rod, this is more important than most think.As for the source of your new engine kit, I always use Deere parts,, even though I am beginning to harbor bad feelings toward the Deere high price/low care for customer attitude..I am taking for granted that you know to clean Her up good as you go, especially the liner o-ring grooves, a little fleck of gasket residue or a bit of an o-ring left in a groove can make a good job go bad,,Darn it
 
Don't think you can get by with an 8000 hour cam.
That's a lot of hours. The pump drive teeth will be worn as well as lobes more than likely.
It's pretty common to have to replace a cam and lifters when nothing else is needed.
I use only Reliance OH kits but have used others over the years.
The only problems I ever had w/OH kits was a Deere in a late 4020. That was maybe 30 years ago. Unless Deere has changed, the after-market kits are more complete.
 
Doubt blowby will blow all those things out unless vent is clogged to tube mashed.
Looks like you would tear eng down before ordering parts.
You won't know bearing size til then.
 
thanks Tim,

Yes, this one's power shift. It was worn with a good amount of blowby when we got her with the previous owner telling me it's never been overhauled. we've worked it hard for 3 years and about 1000 hours, and in the last 100, it's lost the rear and front seal (leaking) and now when its good and hot it leaks out of the timing cover gasket like crazy...

Is the vent tube plugged? could be, but with the amount of vapor coming out of there I don't know how...

I used to overhaul engines for CAT some years back, used to do one about every 2-3 days so cleaning the block up will be second nature to me.

Does JD have any issues generally with liners "walking" or "fretting" on the block from movement? I don't have a kit to check protrusion, is that something I need to do on this 404?

If the head is warped/cracked, can I use the newer 466 style head without issue? doesn't it flow better?

I will get the rods resized as you mention. not used to that as caterpillars o/h kits came with the pistons/rings/liners/rods all as a unit, ya just put shaving cream on the liner seals and dropped them in!

I'm not going to tear into it before I order parts. I need the tractor right now, I just want to have the parts I need to do the job here when I'm ready.

Thoughts on oil pump replacement/cam replacement?

Thanks
DF
 
You will need to check liner protrusion. .000-.004 is the allowed standout.

Late 30/40/50 series turbo/turbo-aftercooled heads are basically the same with some minor differences, the later ones added a lifting boss on the rear manifold side. Early 30 series heads used KDL or "Y type" injectors which had a smaller thread to retain the injector in the head. No air flow difference that I know of till you get into the 7.6 or 55 series heads and thats a whole different animal, valves will not clear the sleeve on a 404.

You can check your oil pump gear wear by pulling the tach drive housing off. Chances are it and the cam are worn out. There's a reason they make new aftermarket steel cams that include lifters.
 
is there an acceptable amount of gear backlash? or is it a looks right feels right type of thing?

I'm taking it that the cam/lifters cannot be replaced without pulling the head if I choose not to do it now?
 
The liner protrusion is rarely a problem on these engines, the cam wears at the gear more than at the Lobes, I would change the cam when you do the engine, along with the oil pump and drive gear, the latter ones were better but it makes for a longer lasting fix to deal with all at the time of the O/H, and yes you can change the cam and followers with the head on,, but a nasty job, they make a follower magnetic holding kit,,but they are an aggravation to deal with..I screw 4 3/4"X6" bolts into the back of the engine and set them on their rear to deal with them,, a lot better
a167912.jpg
 

Six months or more after the job is completed. You will be happier if the job had included removing from the chassis , the head removed and everything torn down to inspect.
 
how exactly would I overhaul the engine without removing the head, freshening it up looking at the turbo and inspecting all the parts? I have to put a timing gear cover on it, so I'll be looking at that, a rear seal was put in it in january, so that's done. I'm removing the pistons liners oil pump and maybe the cam/lifters, so what else would I inspect?
 
(quoted from post at 16:31:22 09/03/14) how exactly would I overhaul the engine without removing the head, freshening it up looking at the turbo and inspecting all the parts? I have to put a timing gear cover on it, so I'll be looking at that, a rear seal was put in it in january, so that's done. I'm removing the pistons liners oil pump and maybe the cam/lifters, so what else would I inspect?

Quote " The blowby is getting bad enough now that it blew the front seal out last fall, the rear seal out this spring (soaking the clutch) and now it's pushing out out through the timing cover gasket. " Unquote
I don't see anything saying that you replaced the rear main seal just last January.
Why didn't you do the overhaul last January when the engine was known to be worn and the tractor was already half torn apart?
 

I sure agree. Can't understand why persons spend big bucks to build and engine and leave worn lifters and cam inside the engine? They are not even expensive to replace.
 
Because I needed the tractor ASAP and didn't have the time to have the tractor down, or the time I needed myself to overhaul it.

Whether or not it needed an overhaul had nothing to do with the fact that I HAD to put a rear main seal and a clutch or the tractor was useless to me...

The rear seal could be done in a day, while the overhaul between teardown, cleaup, parts ordering, machining, and assembly can take 10 days two 2 weeks...

That is why I didn't overhaul it when the seal was put in...

Unlike most in the farming business, ranchers stay busy year round and we have very little "down time" to plan these kinds of events.
 

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