JD 520 repair on exhaust

drastic dave · Jan 9, 2019

Have broken exhaust manifold. Tractor is not used a lot. Can
it be repaired or would it be best to replace? Any tips on
removal, rusty bolts usually spell difficulty for me.

PJH · Jan 9, 2019

I've had good and bad luck welding cast iron parts with nickel ($$$) or stainless rods, but most of the bad luck involved manifolds.

Search the archives and you'll find several discussions on removing the old manifolds. My experience? ALL of the bolts will come out except one, ha. Lots of soaking, light tapping, more soaking, heat and cool, light twisting both directions, heat and cool, more soaking, time and patience. You can get in a hurry and make lots of trouble for yourself. You can do it if you're patient.

Mike M · Jan 9, 2019

Run it as is if it just has a leak ? If it must be changed it is way easier and better to remove the cyl. head ,do a valve job too and resurface where the exhaust port gets eroded away also can drill out any broken bolts in a milling machine.

John Deere D · Jan 9, 2019

I recently replaced the exhaust / intake manifold both on my JD 520 as well as the neighbors JD 620:

Removed steering shaft:
Removed hood,fuel tank:
Carburetor:
Disconnected battery:
Disconnect and drain as per required:

With a angle grinder....cut the heads off all and or any CAP screws that attache manifolds to engine block:
Lift and remove manifold:
Plugged off intake as well as exhaust ports:
Welded WASHERS to all studs protruding from block (studs that I cut heads off):
Placed a HACKSAW BLADE,thickness between washers and block:
Applied kroil penetrate after weld had cooled between washers and engine block:
With pipe wrench all cap screws threaded out of Engine block:
Cleaned block:
Compared new manifolds to old manifolds:
Install new manifolds:
Re torqued all cap screws after engine up to operating temperature:

Bob...Owner Operator JD 520 and other colored Tractors:

machineryman1945 · Jan 10, 2019

(quoted from post at 11:54:44 01/09/19) I recently replaced the exhaust / intake manifold both on my JD 520 as well as the neighbors JD 620:

Removed steering shaft:
Removed hood,fuel tank:
Carburetor:

Looks like John Deere D went to a lot of unnecessary work...the last one I replaced...I removed the settling bulb after draining fuel from gas tank to prevent breakage or spark. I then removed exhaust pipe, carburetor had just the manifold on engine. I then go a real sharp fairly large chisel and "google" I split the manifold from around the studs on the outer section. The inside bolts came loose without any problem. Left them resting in place. Once I got manifold loose to move, pryed it up a far as possible cut the studs off then removed the manifold. Now having said this the tractor was a nice unit with a particular owner. I also used towels to protect paint leaving opening on areas I was chiseling. After manifold off...used a nice sharp pair of vice grips and some penetrating and worked the studs outs. while off I pulled plugs and blew air back out to prevent any debrie from getting in under valves. Put studs back in new manifold slid gasket and manifold back in place and finished job...no problem...too about 3 hrs...

BushogPapa · Jan 10, 2019

This will repair that manifold crack and can be used to re-seal where the manifold meets the Head..

tHERMOSTEEL High temp metal repair..Feels a little like Valve Grinding compound when in the container, but WILL set up and be Hard as Flint..!

Let the repair Air-Dry a while, then only idle the engine wnile this Fuses together...

Cargo CHEMICAL Corp.
1304 f.m. 3083 Conroe, Texas 77303

Get it at "AutoZone, etc...

JD 520 repair on exhaust

drastic dave

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PJH

Well-known Member

Mike M

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John Deere D

Well-known Member

machineryman1945

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BushogPapa

Well-known Member

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