A manifold, question

Mike(NEOhio)

Well-known Member
Location
Newbury, Ohio
I may need a manifold for my '51 A gas. I see two different part numbers. A2386R and A4039R special gas. Mine has 2386. What is the other one for? I see some on ebay and aftermarket. Is one any better, performance-wise? Just curious. JD parts says 2386 substitutes for 4039.
 
My gas manifold was broke and I bought a used gas manifold that is different from the one I had. I got the one that the exaust runner runs under the intake runner to help with frosting up. Don't remember the numbers of both but the one I got now runs fine and I don't have any frosting problems. Either one will be fine. Don't know about these aftermarket manifolds so I got a original JD one.
 
The part number you list as A2386R should be A3386R.

A4039R is a casting number I believe. It's part number is AA4543R which the parts catalog says is a substitute for A3386R.

Double letters at the beginning of a part number, like AA, AB etc, indicate the part is an assembly of two or more parts. In this case AA4543R is a manifold and studs.
 
you have what's called the cold gas one and the other one you list (4039) is what's called cold weather or north climate manifold. Self explanitory once you look at the way the intake runner is routed in relation to exh. I love the looks of the 4039 better and unless you are tractor pulling and need every avail 1/2 hp...both are orig equipment.
 
Forgot to mention, there are plenty of good solid originals out there for less %$$$ than aftermarket (read China) E-bay has plenty and nice ones for under $ 100
 
Also...if you can't see the JD numbers on top of them...even if they look used....they are still china take-offs. Just sen quite a few nice 3386 on there for 60-70 $4 mark and a couple 4039's also. Make sure they have numbers. These aftermarkets have been out long enough now that tractors are being parted out and have rather used looking china on them and some sellers don't even know the diff and ad as originals.
 

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