430 engine rebuild

ricksuper67 · Aug 4, 2014

Rebuilding my 430 engine. The machine shops in my area deal mostly with cars and trucks. There is a guy about 3 hours away that has done tractor work before.

Is there anything special about working on a 2 cylinder? That the local shops can not handle?

Would anybody have a ballpark cost for the head and block machining cost.

Thanks

Mike M · Aug 4, 2014

The engine block in that machine is small enough any shop that can bore a Chevy can do it.

DScott · Aug 4, 2014

(quoted from post at 10:54:35 08/04/14) Rebuilding my 430 engine. The machine shops in my area deal mostly with cars and trucks. There is a guy about 3 hours away that has done tractor work before.

Is there anything special about working on a 2 cylinder? That the local shops can not handle?

Would anybody have a ballpark cost for the head and block machining cost.

Thanks

I have always taken my 2 cylinder heads to the local shop that works on car heads. There is nothing special or over sized about them. As Mike said, those cylinders are small and short enough that boring the cylinders does not require any special equipment that they wouldn't need to use on a Chevy engine. I have used two or three different shops around here with no problems.

ricksuper67 · Aug 4, 2014

Thanks for the replies

buickanddeere · Aug 4, 2014

Stock or a little more zip ?

M-MAN · Aug 4, 2014

Yes there is something special when you're talking about a Dubuque and a machine shop. Be sure to take him the rear cam bearing instructions from the service manual or you will be tearing that engine back down. The orientation of that oil hole is unique to Dubuques.

Dave H · Aug 5, 2014

If you have the instructions on the rear cam bearing that MMan referenced, in that section there should also be instructions on installing the correct rocker arm stud in the correct hole on top of the head.

ricksuper67 · Aug 5, 2014

(quoted from post at 20:14:45 08/04/14)
Stock or a little more zip ?

More zip? What would that involve?

ricksuper67 · Aug 5, 2014

(quoted from post at 00:38:40 08/05/14) Yes there is something special when you're talking about a Dubuque and a machine shop. Be sure to take him the rear cam bearing instructions from the service manual or you will be tearing that engine back down. The orientation of that oil hole is unique to Dubuques.

I do not have a manual. Would those instructions be in the I&T manual?

buickanddeere · Aug 5, 2014

(quoted from post at 07:52:14 08/05/14)

(quoted from post at 00:38:40 08/05/14) Yes there is something special when you're talking about a Dubuque and a machine shop. Be sure to take him the rear cam bearing instructions from the service manual or you will be tearing that engine back down. The orientation of that oil hole is unique to Dubuques.

Click to expand...

I do not have a manual. Would those instructions be in the I&T manual?

The IT manual contains just enough info to get most people into trouble. An IT manual is best used to prop doors open etc
The nice folks at 1-80"-522-7448 will send you an operators and service manual on CD or hard copy.1-800-522-7448.
The later industrial 440 gassers used higher flowing manifolds, a larger carb etc.
Don't forget a re-grind for the cam and followers. They do wear , an eyeball test doesn't measure with usable accuracy .

ricksuper67 · Aug 5, 2014

Does this sound about right for machining? (if everything ok no extra work needed)

Block $500
Head $300
Crank $150

Dave H · Aug 5, 2014

I thought this one over.

Why do a major rebuild without identifying the need for one.

The last two old tractors I did did not any machine shop work.
Untitled URL Link

ricksuper67 · Aug 5, 2014

i could measure everything and see if it is within tolerance. I have taken most if it apart. Here are some issues i was having.

1. When i put the tractor in 4th gear it would stall out after a few hundred feet. When I put it in 5th it would stall out immediately.
2. When pushing snow with a 6 foot rear blade it would continue to run but the wheels did not move if I was pushing too much snow.
3. It quit running a year ago, I parked it in back of the garage the muffler fell off and the engine filled with rainwater.

buickanddeere · Aug 5, 2014

Do you have any buddies around that work on two cylinders?
Before ripping everything apart. Find and solve the carburation, ignition and clutch problems first.

Tx Jim · Aug 6, 2014

(quoted from post at 23:25:48 08/05/14)
Do you have any buddies around that work on two cylinders?
Before ripping everything apart. Find and solve the carburation, ignition and clutch problems first.

b&d
Evidently you overlooked this statement of ricksuper67.

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ricksuper67 · Aug 6, 2014

Would anybody know the bore spec's for the 430 engine?

buickanddeere · Aug 6, 2014

(quoted from post at 12:12:32 08/06/14) Would anybody know the bore spec's for the 430 engine?

It's in that service manual I told you about.
If you can't afford the manual. You certainly can not afford the tractor and a rebuild.

nlastovi · Aug 6, 2014

(quoted from post at 09:12:32 08/06/14) Would anybody know the bore spec's for the 430 engine?

according to http://www.tractordata.com/farm-tractors/000/0/4/49-john-deere-430-engine.html

Bore/Stroke: 4.25x4.00 inches [108 x 102 mm]

Piston clearance is typically supplied by the piston manufacturer since it depends on how much the piston grows as it gets warm. Often quoted rules of thumb are around 0.001" per inch of diameter. This is measured based on the pistons to be installed.

buickanddeere · Aug 6, 2014

That maybe why I told him to make certain the carburation/fuel system and the ignition system were 100% before ripping everything apart. See how it runs first.
Odds are the tractor would have run well enough for putting around even after sitting full of water. No mention of freezing damage.
Free play on the clutch needs to be inspected.

ricksuper67 · Aug 6, 2014

1.) The manual has been ordered but I did not get it sent same day express or overnighted.
2.) I was curious to see what shape the cylinders were in, or if they had been previously machined. I read it was 4.25 but I was just making sure. For all I knew it could have been 4.24 or 4.26 and it was rounded off.

ricksuper67 · Aug 6, 2014

(quoted from post at 20:36:52 08/05/14) I thought this one over.

Why do a major rebuild without identifying the need for one.

The last two old tractors I did did not any machine shop work.
Untitled URL Link

Well I measured the cylinders and they were 4.25 dia. Besides all the surface rust on the walls so far so good.

430 engine rebuild

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