986 turbo?

travz500 · Jan 22, 2009

does the 986 have a factory turbo or was it naturally aspirated?

LenND · Jan 22, 2009

If the 986 is the newer 966 it did not come with a turbo. A 966 with a turbo was called a 1066.

NY 986 · Jan 22, 2009

D-436 naturally aspirated.

IaGary · Jan 22, 2009

Except the 966 has the 414 motor and the 986 has the 436 motor.

Gary

Hugh MacKay · Jan 23, 2009

Len: I don't quite think one could call a 966 with a turbo, a 1066. There is a few more differences than just the turbo.

LenND · Jan 23, 2009

You guys are right but I have never seen a 966 from factory with a turbo. Did the 986 come the same way?

LenND · Jan 23, 2009

What I meant was the '86' series replaced the '66' series.

LenND · Jan 23, 2009

I just looked up both tractors in my books by Larry Gay and by Wendell. Here is what they wrote. 966--414 ci--2600 rpms--4.30 x 4.75
100 + hp- some with 34 inch rear tires. 1066---414---2600 rpms---4.30 x 4.75.
125 + hp---With turbo. 38 in,tires.
Made from 1971 to 1976.

Hugh MacKay · Jan 23, 2009

Len: 966 had Cat II 3 point hitch, 1066 had CatIII hitch, Bull gears in 1066 were heavier than 966. 966 had a 12" clutch, 1066 had 14" clutch. The engine block was different.

LenND · Jan 24, 2009

You will have to argue that with Gay and Wendell. According to their specs the engine is identical except for turbo. The rest of the tractor is probably different because of increased horse power in 1066. Len

Hugh MacKay · Jan 24, 2009

Len: There is a possibility both of us are correct. I believe the first 1066 may be as you describe. My 1066 was a 75, I bought new, and the head had been changed to different valves. My tractor had a recall from day it was new for heavier rocker arm assembly. Apparently after IH changed the valves, 1066s started breaking rocker arms.

I do know the oil journals in 1066 were always different from 966. If I still had my Blue Ribbon Service manual there were other differences. Some where changes 2-3 years into production and that manual gave the exact serial number break down. Just because both were 414 engines turning 2,600 rpm does not necessarily make them the same.

I don't intend to argue my point with some book writer, My information comes from Blue Ribbon Service manual published by IH and covering 766, 966, 1066 and 1466 tractors. May I suggest Mr. Gay and Mr. Wendel consult the same book. By the way it is 3" thick, and that is twice as thick as Wendel's book 150 years of IH, which included all production.

Owen Aaland · Jan 25, 2009

Besides the turbo the differences between the 966 and 1066 engines include 12 piston cooling jets for the turbocharged engine versus 6 for the NA engine. The turbo used a wider oil pump for more volume. The pistons and rings are different. Cylinder heads have different cooling jets. The NA engine used a four vane water pump and the turboed engine used a pump with eight vanes.

986 turbo?

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