Kohler 24 523 03 Long Block for Command PRO EFI ECH730–ECH749 Horizontal-Shaft Engines (74 - ships in an RFQQQ box Click to zoom

Kohler 24 523 03 Long Block for Command PRO EFI ECH730–ECH749 Horizontal-Shaft Engines (747cc)

MPN 24 523 03

In stockEngine Blocks & Internals

Overview

The Kohler 24 523 03 is a genuine Kohler/Rehlko long block for Command PRO EFI ECH730–ECH749 engines, the horizontal-crankshaft, electronic-fuel-injected 747cc models. A factory long block lets you rebuild a worn or damaged engine around a new core while reusing the components that are still serviceable on your current engine.

Kohler Engines is now Rehlko; the part number is unchanged.

Key features

  • Genuine Kohler/Rehlko service long block, part number 24 523 03
  • Built for the Command PRO EFI ECH730–ECH749 horizontal-shaft family
  • Aluminum block with cast iron cylinder liners
  • Full-pressure lubrication with full-flow oil filter
  • New factory part, made in the USA

Fits

  • Engines/Models: Kohler Command PRO EFI ECH730–ECH749 (horizontal shaft)
  • Typical equipment: commercial and industrial equipment powered by the ECH730/ECH749 EFI engines
  • How to confirm: have your engine model, spec and serial number ready (on the engine's identification label). Kohler issues several long block numbers for this family and changes some parts mid-production, so we confirm the correct long block by spec before it ships.

Specifications

Brand Rehlko (formerly Kohler Engines)
MPN 24 523 03
Also listed as 2452303, 24-523-03
UPC 885612232977
Part type Long block
Engine family Command PRO EFI, ECH730–ECH749
Crankshaft Horizontal
Engine type 4-cycle gasoline OHV, electronic fuel injection
Displacement 747 cc (45 cu in)
Bore x stroke 83 x 69 mm (3.3 x 2.7 in)
Compression ratio 9.1:1
Construction Aluminum block, cast iron cylinder liners
Lubrication Full pressure with full-flow filter
Oil capacity (ECH730 engine) 1.9 L (2 US qt)
Max torque (ECH730 engine) 51.7 Nm (38.1 lb-ft) @ 2800 RPM
Country of origin USA
Shipping weight 60 lb (ships by freight)

Frequently asked questions

Which engines does the 24 523 03 long block fit?

It is the long block for Kohler Command PRO EFI ECH730–ECH749 horizontal-shaft engines. Send us your model, spec and serial number and we will confirm it is the right number for your engine.

Is there a vertical-shaft version?

Yes. ECV730–ECV749 vertical-shaft engines use different long block numbers (for example 24 523 06, 07, 16 and 22). Don't swap a vertical long block onto a horizontal engine or the reverse.

What is the displacement?

747 cc (45 cu in), with an 83 mm bore and 69 mm stroke.

How much oil does an ECH730 hold?

Kohler's published spec for the ECH730 is 1.9 L (2 US qt). Always check the dipstick after filling.

Is a long block a complete engine?

No. A long block is the core engine assembly, not a ready-to-run engine. Contact us before ordering and we will confirm exactly which components are included and what to transfer from your old engine.

Is Kohler the same as Rehlko?

Yes. Kohler's engine business now operates as Rehlko, and genuine parts keep their Kohler part numbers.