Caterpillar engines in Oshkosh trucks

[quote="roerjm"]Hello;
I am looking at two different Oshkosh snow plow trucks I am in interested in. One has a Cat 3406A engine and the other has a Cat 3306 engine. Can anyone educate me on the differences between the two engines, pros & cons of each engine, horsepower comparisons, etc. Your info appreciated. Thanks, Roland[/quote]

3406=893cu.in 300 hp?
3306 638 cu.in 250 hp?

Bob

roerjm - On the engine blocks there will be a S/N tag with the engine S/No's and also the "arrangement number". We need the arrangement number to track down the precise power specs.

These engines were known as the "3300 series" line of engines, and they were produced in multiple configurations using a range of bore sizes from the late 1960's.
They are fully mechanical engines with no electronic components whatsoever.

The 3306 came in three truck engine versions - 2 standard models and 1 hi-torque model - all with varying HP settings.
The 2 standard engines were either 250HP or 270HP, and the high-torque engine was 245HP.
The 250HP produced 935ft/lbs torque, the 270HP produced 1051ft/lbs torque and the high-torque engine produced 1112ft/lbs torque.

The 3306 was a 6 cyl with a 4.75" bore x 6.0" stroke, and the 3406 was a 6 cyl with a 5.4" bore x 6.5" stroke.
The early engines used precombustion chambers with scroll fuel injection systems, but after the mid-1970's they were modified to direct injection and sleeve valve injection for improved fuel efficiency.
Depending on the age and arrangement number, the 3306 and 3406A could be either precom or DI.

The 3406A initially came with a single HP rating, then in the late 1970's it was produced in 3 ratings - Standard, Economy, and High Torque.
There were 4 different HP ratings in standard, 4 different HP ratings in Economy and 2 different HP ratings in the High Torque model.

Both are very reliable engines, the 3406A is heavy on fuel useage as compared to the later DI model, the 3406B.

Come back with those Arr. No's and I can check the engines microfiche for the settings.

Regards, Ron.

My error, I need to improve my proof reading. The line should have read ...

[i]"These engines were known as the "3300 & 3400 series" line of engines, and they were produced in multiple configurations using a range of bore sizes from the late 1960's."
[/i]
Bob is technically correct. The 3406A designation is not technically a Cat designation, and does not appear in any Cat literature.
However, to distinguish the early 3406 from the later 3406B, vast numbers of people refer to the early 3406 as the 3406A.

So, here's all those 3406A's for sale, that Bob claims there's no such thing ... 😙

http://www.truckpaper.com/listings/components/acsearch.aspx?mdlx=exact&catid=35015&Mdltxt=3406A&Manu=CATERPILLAR&HDRSO=PRICE&HDROR=asc&scf=false