Mechanical Engineering Set

9665-1·LEGO·2001·84 parts

Used Avg

$230.24

New Avg

$230.24

Showing used price

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About Mechanical Engineering Set

Mechanical Engineering Set (9665-1) is a LEGO LEGO set from 2001 valued at $230.24 on BrickLink. It contains 84 cataloged parts. This set has been retired and is only available on the secondary market.

Seller notes

This is a vintage set (2001). Condition of the box and instructions significantly affects value. A complete set with original box and instructions can sell for well above the average.

Parts (84)

Tire 30 x 10.5 Offset Tread

×4

Tile 1 x 4

×2

Technic, Pin with Short Friction Ridges

×24

Tire Technic Wedge Belt Wheel

×2

Technic, Liftarm, Modified Stud Connector Thin 1 x 4

×2

Common questions about Mechanical Engineering Set

How much is LEGO Mechanical Engineering Set (9665-1) worth?

Mechanical Engineering Set sells for an average of $230.24 used on BrickLink based on 6 months of completed sales. As a retired set, prices tend to hold steady or appreciate over time, especially for complete sets with original packaging. Actual prices vary with completeness. Missing minifigures or key parts will lower the value.

Is LEGO Mechanical Engineering Set (9665-1) retired?

Yes, Mechanical Engineering Set was released in 2001 and has been retired from retail for several years. Retired LEGO sets are only available on the secondary market through BrickLink, eBay, or other resale platforms. At its current price point, it has appreciated since retirement.

How do I check if my Mechanical Engineering Set set is complete?

Use the parts list on this page to check every piece. For the minifigures specifically, you can use the brick'em scanner to identify each figure from a photo and confirm it matches what should be in this set. Missing pieces can be individually sourced on BrickLink.